isis poster session winter 2007

photo gallery (new!)

 poster presentations  ::  presenter instructions

December 7, 2007

4:00 - 6:00 p.m.

Location:  1201 Natural Sciences II

The Winter 2007 ISIS Poster Session on Friday was a huge success.  All posters were greatly appreciated. 
Thank you, presenters, for participating in the event!

Congratulations to our Poster Award Winners!  Judges Ruqian Wu, Ken Janda and Kieron Burke,
had the tough job of selecting winners from a variety of great posters.  (titles and abstracts below)

:; Galina Kerenskaya
:: Bucky Khalap
:: Aleix Garcia
:: Raffaela D'Auria


Also,  we would like to thank the Reginald Penner group and the John Hemminger group for their
assistance with set up and clean-up.

We enjoyed seeing you there and we look forward to the next ISIS Poster Session in June!


event details:

ISIS (the Institute of Surface and Interface Science) is one of 16 Organized Research Units (ORUs)
on the University of California, Irvine (UCI) campus. Through collaborative projects it brings together
faculty and researchers in:

:: Chemistry
:: Physics
:: Developmental and Cell Biology
:: Chemical Engineering and Materials Science
:: INRF
:: Electrical Engineering and Computer Science

This poster session is informal in nature, and it provides an opportunity to learn about current
ISIS member research projects.  This is also a social occasion for ISIS members to get together
to interact - students, postdocs and other group members are especially welcome! 

Posters for the session can be composed of papers presented at recent conferences, or
just a few figures interspersed with brief explanatory prose.

For additional information, please contact:

Diane Stathakis (diane.s@uci.edu).

Instructions
.........................................................................................................................................


::  Locate the card with the poster number that corresponds with the number
    assigned to your poster on the printed program.

::  Attach the number to you poster or poster board.

::  Set up your poster and poster board.

At the end of the poster session, please help with clean-up:

::  Taking down your own poster
::  Collapse your easel and put it into a box
::  Take the easel and the poster board into 1115 NS II, the ISIS Conference room
::  Please help with trash pick up as well if you are able




Poster Presentation Winners
.........................................................................................................................................

Author(s)::	G. Kerenskaya, I. U. Goldschleger, K. C. Janda, and V. A. Apkarian
Department(s)::	Department of Chemistry, UC Irvine
Title::	POLYMORPHISM IN Br2 CLATHRATE HYDRATES
Abstract::	Clathrate hydrates are non-stoichiometric compounds, consisting of guest molecules trapped in a lattice of polyhedral water cages. The resurgence of interest in this fascinating class of solids is in part motivated by the recognition of the vastness of natural deposits of methane hydrates, and their potential global implications with respect to energy and the environment. The structure and composition of bromine clathrate hydrate has been controversial for more than 170 years due to the large variation of its observed stoichiometries. Several different crystal structures were proposed before 1997 when Udachin et al. concluded that Br2 forms only the tetragonal structure. We show polymorphism in Br2 clathrate hydrates by identifying two distinct crystal structures through optical microscopy and resonant Raman spectroscopy on single crystals. The two structures are clearly distinguished by the resonant Raman spectra of the enclathrated Br2, which show long overtone progressions and allow the extraction of accurate vibrational parameters.

Author(s)::	Vaikunth Khalap, Tatyana Sheps, Alexander Kane, Philip G. Collins
Department(s)::	Department of Physics and Astronomy and CaSTL, UC Irvine
Title::	HYDROGEN SENSING PROPERTIES OF PALLADIUM-DECORATED CARBON NANOTUBE CIRCUITS
Abstract::	Sensitive hydrogen gas sensors can be fabricated from carbon nanotube circuits decorated with palladium metal, and we have investigated the responsible physical mechanisms using isolated, single-walled carbon nanotubes (SWCNTs).  A highly sensitive transduction mechanism involves Pd-decorated defect sites, which in both metallic and semiconducting SWNTs results in reversible conductance swings of 100%.  This experiment will study the temporal dynamics and pressure dependence of this mechanism.

Author(s)::	Aleix. G. Güell,2  Megan E.Bourg,1 Wytze E.van der Veer,1 Reginald M. Penner 1*
Department(s)::	1 Department of Chemistry and Institute for Surface and Interface Science, UC Irvine 2 Department of Physical Chemistry, University of Barcelon
Title::	NANOTHERMOCOUPLES SYNTHESIZED BY LITHOGRAPHICALLY PATTERNED NANOWIRE ELECTRODEPOSITION
Abstract::	The thermocouple is one of the most commonly used devices for temperature sensing, due to its simplicity and easy integration into electronics. In this work, the dimensions of the thermocouple has been further reduced respect our previous work [1] to the range from 50 nm to 300 nm by using Lithographically Patterned Nanowire Electrodeposition (LPNE) [2]. This new method, based on photolithographic techniques, allows the synthesis of nanowires with a high control of the nanometric dimensions of their cross section, their position and macroscopic shape, and with an electrically continuous length that can exceed millimeters. All these are important facts for a further industrial application. Three different prototypes have been designed: single cross nanowires, 2D array cross nanowires, and nanowire-thin film. The devices present extremely fast response times (<100 ns), high stability over long cycles of heating-cooling (temperature range from 20ºC to 120ºC), and a stable lineal calibration with time and use. 1. M. E. Bourg; W. E. van der Veer; A. G. Güell and R. M. Penner, Nano Letters, 7, 3208-3213 (2007). 2. E. J. Menke; M. A. Thompson; C. Xiang; L. C. Yang and R. M. Penner, Nature Materials, 5, 914 - 919 (2006). Acknowledgments: A.G.Güell acknowledges The Electrochemical Society for the Edward G. Weston Fellowship 2007.

Author(s)::	Raffaella D'Auria,1 Maria J. Krisch,1 Matthew A. Brown,1 Douglas J. Tobias,1 John C. Hemminger,1 Markus Ammann, 2 Hendrik Bluhm,3 David E. Starr3
Department(s)::	1 AirUCI and University of California at Irvine 2 Paul Scherrer Institute 3 Lawrence Berkeley National Laboratory
Title::	THE EFFECT OF AN ORGANIC SURFACTANT ON THE LIQUID-VAPOR INTERFACE OF AN ELECTROLYTE SOLUTION
Abstract::	Abstract:: The addition of 1-butanol to an aqueous potassium iodide solution modifies the interfacial profile of ions at the liquid - vapor interface.  Our experiments probe atomic composition at the liquid surface with ambient pressure x-ray photoelectron spectroscopy.  Photoelectron kinetic energies are varied to produce a depth profile of the liquid - vapor interface. Surface enhancement of iodide anions, an effect observed in aqueous potassium iodide solution, disappears in the presence of 1-butanol, a surface active alcohol.  Molecular dynamics simulations of butanol in an aqueous electrolyte solution exhibit the same effect.  Radial distribution functions calculated from the simulations show that butanol appears to interact with both the anion and the cation; this is likely to be the basis for the observed changes in the ion distribution in the presence of the organic.  Insight into ion behavior at mixed organic/aqueous liquid surfaces is crucial for understanding the chemistry of atmospheric aerosols, which frequently contain mixtures of water, electrolytes, and organics.

....................................................................................................................................................................

previous events
.........................................................................................................................................

isis year-end poster session 2007

 ::  Award-Winning Presentations  ::

poster presentations  ::  presenter instructions

June 8, 2007

5:00 - 7:00 p.m.

Location:  Frederick Reines Hall Lobby

ISIS (the Institute of Surface and Interface Science) is one of 16 Organized Research Units (ORUs)
on the University of California, Irvine (UCI) campus. Through collaborative projects it brings together
faculty and researchers in:

:: Chemistry
:: Physics
:: Developmental and Cell Biology
:: Chemical Engineering and Materials Science
:: INRF
:: Electrical Engineering and Computer Science

This poster session is informal in nature, and it provides an opportunity to learn about current ISIS
member research projects.  This is also a social occasion for ISIS members to get together to
interact - students, postdocs and other group members are especially welcome! 

Posters for the session can be composed of papers presented at recent conferences, or
just a few figures interspersed with brief explanatory prose.

Please submit abstract and presentation using the ONLINE SUBMISSION FORM:

http://forms5.createforms.com/11061/form_2_1.html

If your abstract exceeds 250 characters, please forward it to Alison Lara  (laraa@uci.edu).

For additional information, please contact:

Anne Taub (annetaub@uci.edu) or Diane Stathakis (diane.s@uci.edu).

....................................................................................................................................................................

instructions
.........................................................................................................................................

Volunteers are needed to assist with easel and poster-board transport and set-up from the Chemistry office to the lobby of FRH. 
Please contact Anne Taub (annetub@uci.edu) if you are availble to volunteer, starting at 4 p.m.

At 4:30 p.m. on Friday, June 8 in the lobby of FRH:

::  Locate the card with the poster number that corresponds with the number assigned to 
    your poster on the printed program.

::  Attach the number to you poster or poster board.

::  Set up your poster and poster board.

PRIZES
Judges: Professors Max Wolfsberg and Alexei A. Maradudin will review the posters.  When they have chosen the three
top posters (two graduate and one undergraduate), they will make an announcement. 

Winners will be awarded with a certificate and a $50 UCI Bookstore certificate.
PRIZE WINNERS: #11 (Ning Wang), #14 (Megan Bourg) and #16 (Eric Kalman).  Congratulations to these three prize winners!

At the end of the poster session, please help with clean:
::  Taking down your own poster
::  Collapse your easel and put it into a box
::  Take the easel and the poster board into 1115 NS II, the ISIS Conference room
::  Please help with trash pick up as well if you are able




Award-Winning Presentations
.........................................................................................................................................

Congratulations to the three winners of the June ISIS poster session!

Poster Judges: 
Professor Max Wolfsberg, Department of Chemistry
Professor Alexei  Maradudin, Department of Physics and AStronomy

$50 Gift Certificate Prize Winners (in the order listed, not as first, second, third, etc.)

# 11.  Eugene Y. Song, Rong W. Maoj, Ning Wang, Prof. Chen S. Tsai1
Shirley C. Tsai2   
1 Dept. of Electrical Engineering and Computer Science
2 Dept. of Chemical Engineering, Calif. State Univ., Long Beach   
   
Title - MHz Ultrasonic Nozzles with Applications to Nano/Bio/Materials Technology   
    .........................................................................................................................................
   
# 14 Megan Bourg, Prof. Reginald M. Penner
Department of Chemistry
   
Title -  Towards Nanowire-Based Thermocouples   
    .........................................................................................................................................

# 16 E. Kalman, K. Healy, Prof. Z. Siwy
Department of Physics and Astronomy

Title - Tuning of Ion Current Rectification by Signal Mixing
   
.........................................................................................................................................

Special thanks to Professor Wolfsberg and Professor Maradudin for their hard work in selecting
three among the 25 as "winners." I am sure this was a difficult task.

Also special thanks to the Collins Group for their assitance with set-up and clean-up - the help
was much appreciated.

Soon we will have photos of the event and of the winners posted on the ISIS website maintained
by Alison Lara of the Physics Department. Thanks to Alison for her excellent job in this area. 
Here is the Website address:

http://www.physics.uci.edu/~isis/





Poster Presentations
.........................................................................................................................................

1
Author(s)::	Aniketa Shinde (email: ashinde@uci.edu)
Affiliation(s)::	Physics & Astronomy
Title::	Fabrication and Optimization of Ordered Assemblies of Monodisperse Noble Metal Nanostructures: a platform for understanding nanoscale catalysts
Abstract::	Noble metal (Au, Pt) nanostructures have demonstrated higher performance in catalytic properties than their bulk counterparts, exhibiting higher activity and turnover frequency for reactions such as CO oxidation and ethylene hydrogenation.  We employ a unique fabrication process that uses self assembled rare earth disilicide (RESi2) nanowires as templates on stepped silicon surfaces to produce ordered parallel arrays of size-controlled platinum and gold nanowires and nanoparticles for the purpose of studying size, shape and materials dependence of catalytic properties.  After the template is fabricated, noble metal is deposited and preferentially aggregates on the RESi2 nanowire surface. Reactive ion etch results in noble metal nanoparticles or nanowires depending on coverage.  Our nanoparticles show a narrow size distribution comparable to solution fabricated nanoparticles.  Using the Vienna ab initio Simulation Package studies are being performed to understand self-assembly mechanisms for future system optimization.

2
Author(s)::	Alex Kane (email: akane@uci.edu)
Affiliation(s)::	Physics and Astronomy
Title::	High Temperature Conductivity and Reactivity of Carbon Nanotube electronic Circuits
Abstract::	At high temperatures carbon nanotubes begin to react with their environment. We have built an apparatus that provides continuous four probe electrical characterization of the nanotubes from room temperature to 1500 K in an ultrahigh vacuum system.

3
Author(s)::	Dora Guzmán (email: dguzman@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	Investigation of Mechanically Stable Protein Domains for Use in Advanced Biomaterials
Abstract::	TBN

4
Author(s)::	Vaikunth Khalap, Alexander Kane, Prof. Phil Collins (email: vkhalap@uci.edu)
Affiliation(s)::	Physics and Astronomy
Title::	Chemoresistance of carbon nanotube circuits incorporating electrochemically-decorated defects
Abstract::	We investigate SWNT devices with single point functionalizations. Standard fabrication techniques are supplemented by an electrochemical point-oxidation process that creates insulating defects into pristine SWNTs.  Selective electrochemistry subsequently deposits metal onto the insulating site(s) and restores the device conductivity.  The resulting circuits inherit the chemical sensitivity of the metal deposits.

5
Author(s)::	L.C. Yang, P.Y. Tam, B.J.  Murray, T. M. McIntire, Cathie M. Overstreet, G.A. Weiss, Prof. R.M. Penner (email: lcyang@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	Virus Electrodes for Universal Biodetection
Abstract::	The development of label-free biosensors for key biomolecules is an objective that is shared by many research groups worldwide.  We present an approach involving the electrochemical detection of biomolecules binding to electrode surfaces on which an engineered bacteriophage, M13, has been covalently attached. This bacteriophage has - on its surface - polypeptide receptors that form the basis for molecular recognition.  These phage particles are prepared using the techniques of phage display.     We describe the preparation of the biosensor surface, the optimization of the electrochemical impedance measurement, and the results of our first experiments that involve the detection of antibodies that are recognized and bound by the immobilized phage particles, and “control” antibodies that are not recognized.  The response of this biosensor to the prostate cancer marker, PMSA, is also reported. In all cases, the observed impedance responses are “benchmarked” against the response of a quartz crystal microbalance, on which the biosensor is constructed.

6
Author(s)::	Yuan Xingao Gong, Prof. Ruqian Wu (email: uand@uci.edu)
Affiliation(s)::	Physics and Astronomy
Title::	Origin of high activity and selectivity of PdAu(001) bimetallic surfaces toward vinyl acetate synthesis
Abstract::	We perform systematic density functional studies to elucidate the mechanism of vinyl acetate synthesis on Pd/Au(001). Atomic geometries, activation energies and reaction energies are determined for three separate reaction stages: coupling of ethylene and acetate; â-H elimination; and vinyl acetate desorption. Significantly, we find that Pd „monomer‰ pair is much more robust in all three reaction stages than large Pd ensembles such as Pd monolayer, mainly due to high mobility of reactants on surrounding Au sites. The remarkable high activity and selectivity of vinyl acetate reaction on PdAu bimetallic surfaces observed by Goodman et al. are exclusively attributed to the ensemble effects.

7
Author(s)::	T. A. Leskova1, Prof. A. A. Maradudin1, E. R. Mendez2 (email: tleskova@uci.edu)
Affiliation(s)::	1Physics and Astronomy / Institute for Surface and Interface Science, UCI 2Division de Fisica Aplicada, Centro de Investigacion y de Educacion Superior de Ensenada,  Km. 107 carretera Tijuana-Ensenada, Ensenada, B.C.  22800, Mexico
Title::	TBN
Abstract::	We  show that it is possible to design a  randomly rough perfectly conducting surface that, when illuminated at normal incidence by a beam with a specified intensity profile in the plane of scattering transforms this beam into a scattered beam with a different specified intensity profile in the far field.

8
Author(s)::	Wei Luo1, Ping Chu2, Prof. Douglas L. Mills2, Prof. Reginald M. Penner1, Prof. John C. Hemminger1* (email: wluo1@uci.edu)
Affiliation(s)::	1Department of Chemistry / Institute for Surface and Interface Science 2Department of Physics and Astronomy / Institute of Surface and Interface Science
Title::	Polarization-Dependent Surface Enhanced Raman Scattering from Silver Nanoparticle Arrays
Abstract::	One specially promising method to design Surface Enhanced Raman Scattering (SERS) substrates is to fabricate silver nanoparticle arrays with nanoscale gaps that can carry strong and localized surface plasmon resonances. Studies have revealed that dramatic SERS phenomena require interparticle spacings to be around 10 nm or less which is hard to achieve with current fabrication technologies. We present the straightforward fabrication of ordered spherical silver nanoparticle arrays with gaps less than 10 nm on Highly Oriented Pyrolytic Graphite (HOPG). Physical Vapor Deposition (PVD) of silver on HOPG under controlled experimental conditions results in the self-assembly of rows of silver nanoparticles. Straight rows of particles are obtained that extend over distances as large as 100 microns. Arrays of rows of particles are parallel over similar distances. Since these 2-dimentional particle arrays are organized over 100’s of microns they are easily addressed in conventional optical experiments. Using thiophenol adsorbed on the silver particles as probe molecules, highly polarization-dependent enhanced Raman scattering has been observed form these particle arrays. When light is polarized along the axis of the nanoparticle arrays, the enhanced Raman spectra are much stronger than when light is polarized perpendicular to the axis of the nanoparticle arrays. Theoretical calculations of the electromagnetic response of the interacting nanoparticles to a light field will also be presented. Ongoing research with these arrays includes a number of different studies. Among these is the use of the particle arrays as a collection of “nano-electrodes”. For example, electrodeposition of semiconductors on the silver nano-arrays has been accomplished with the subsequent observation of enhanced photo luminescence.

9
Author(s)::	Matthew Aggleton (email: maggleton@gmail.com)
Affiliation(s)::	Physics and Astronomy
Title::	Low temperature friction of diamond films
Abstract::	Diamond, being a very strong and wear resistant material, has been of increasing interest ever since the development of artificial  olycrystalline films.  In order to further our understanding of the friction properties of diamond, the coefficient of kinetic friction (COF) of polycrystalline diamond films with natural diamond counterfaces has been measured over a wide range of cryogenic  temperatures under ultra-high vacuum.  A significant difference has been seen between microcrystalline diamond films (MCD) with very low hydrogen content and ultra-nanocrystalline diamond films (UNCD) with  high hydrogen content.  The MCD has a high COF (.6) over all temperatures from 8K to 300K.  The UNCD, on the other hand, displays notable and repeatable changes in COF with temperature, most changes occuring between 125K and 350K.  In addition, studies were performed to observe wear-in rates at constant temperatures.

10
Author(s)::	Eli Van Cleve (email: vancleve@uci.edu)
Affiliation(s)::	Physics and Astronomy
Title::	Cryogenic Pulsed Laser Deposition and Helium Adsorption on Lithium Substrates
Abstract::	The helium adsorption and wetting properties of alkali metals have been studied for years with the focus on cesium and rubidium.  Helium wetting properties of alkali metals is of interest because their interactions with helium are the weakest in nature.  Until now it was not possible to make cryogenic lithium films because of its high melting temperature and therefore it was not possible to study the helium adsorption and wetting properties of lithium.  Using newly developed cryogenic pulsed laser deposition system lithium films were grown at 4K onto a quartz crystal microbalance (QCM).  The helium adsorption properties of lithium were studied by running helium isotherms between 1.45K and 2.5K.  No solid like layers of helium were observed on the lithium films and the superfluid transition was observed to occur at a lower pressure but the same helium liquid thickness as gold.  By measuring the low coverage slope of the isotherms the ground state of helium bound to lithium was found to be -13.65K.

11	Prize Winner!
Author(s)::	Eugene Y. Song, Rong W. Maoj, Ning Wang, Prof. Chen S. Tsai1 Shirley C. Tsai 2 (email: cstsai@uci.edu)
Affiliation(s)::	1Dept. of Electrical Engineering and Computer Science 2Dept. of Chemical Engineering, Calif. State Univ., Long Beach
Title::	MHz Ultrasonic Nozzles with Applications to Nano/Bio/Materials Technology
Abstract::	This paper reports realization of 1MHz ultrasonic nozzles using Si-based micro-electro-mechanical system (MEMS) technology for production of 5 mm-diameter monodisperse droplets with applications to nanoparticles synthesis, microelectronics processing, and pulmonary drug delivery. ____________ *Sponsors:    National Institute of Health (NIH); UC Discovery Program

12
Author(s)::	Gang Qiu, Masatoshi M. Kobayashi, Prof. Chen S. Tsai (email: gangq@uci.edu)
Affiliation(s)::	Electrical Engineering & Computer Science
Title::	Enhanced Microwave FMR Absorption and Bandwidth in a YIG/GGG-GaAs Flip-Chip Layer Structure*
Abstract::	Enhanced microwave ferromagnetic resonance (FMR) absorptions and bandwidth in yttrium iron garnet/ gadolinium gallium garnet-gallium arsenide (YIG/GGG-GaAs) flip-chip layer structures using a microstrip step-impedance low-pass filter (LPF) are reported. The measured transmission loss and return loss of –25.0 dB and –8.7 dB using the microstrip step-impedance LPF, at FMR frequency of 8.5 GHz, show a higher level of microwave FMR absorption in the YIG/GGG-GaAs layer structure as compared to a 50   microstrip. The microwave transmission characteristics of the magnetic over-layer in a large base band of 2.0-20.0 GHz were also measured. ____________ *Supported by UC Discovery Program;  Wang NMR Inc.

13
Author(s)::	Chengxiang Xiang, Michael A. Thompson, Aleix G. Güell, Erik J. Menke,  Prof. Reginald M. Penner* (email: xciang@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	Lithographically Patterned Nanowire Electrodeposition
Abstract::	Nanowire fabrication methods can be classified either as "top down", involving photo- or electron beam lithography, or "bottom-up", involving the synthesis of nanowires from molecular precursors. Lithographically Patterned Nanowire Electrodeposition (LPNE) combines attributes of photolithography with the versatility of bottom-up electrochemical synthesis. Photolithography is employed to define the position of a sacrificial nickel nanoband electrode that is recessed into a horizontal trench defined by the substrate surface and photoresist. This trench acts as a "nanoform" to define the height of an incipient nanowire during its electrodeposition.  The width of the nanowire is determined by the electrodeposition duration.  Removal of the photoresist and nickel reveals a nanowire - composed of gold, platinum or palladium - with a rectangular cross section and a height and width that can be independently controlled, and as small as 10 nm. The polycrystalline nanowires synthesized by LPNE can be electrically continuous for 1 c m.  Application of LPNE synthesized nanowires including thermocouples, crossed wires, and bimetallic wire arrays are briefly explored.

14	Prize Winner!
Author(s)::	Megan Bourg, Prof. Reginald M. Penner (email: mbourg@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	Towards Nanowire-Based Thermocouples
Abstract::	The ability to accurately measure temperature on the same time scale as a thermal process under investigation is important in many industrial processes.  A thermocouple, which consists of a junction between two dissimilar metals, is most often the device used for such measurements.  As the thermal mass of the junction decreases, the response time decreases and the spatial resolution increases.  Therefore, junctions containing nanowires should lead to faster response times and increased spatial resolution.  In order to initally investigate this, we prepared nanowire-thin film (NWTF) junctions consisting of electrodeposited nanowires and an evaporated film.  These devices measure temperature accurately and reproducibly, and have a response time of 1.9ms.  For comparison, the response time of a 125μm type J thermocouple was 5.7ms.  To improve upon the enhancements shown by NWTF devices, nanowire-nanowire (NWNW) junctions were also fabricated.  NWNW thermocouples measure temperature accurately and reproducibly, and have a response time of 0.7ms.  Neither type of nanowire- based thermocouple show a decrease in sensitivity.   The characterization of these thermocouple arrays by SEM, EDS, and thermal measurements will be presented.

15
Author(s)::	Attila Cangi, Peter Elliott, Donghyung Lee, Prof. Kieron Burke (email: attila.cangi@uci.edu)
Affiliation(s)::	Department of Physics and Astronomy / Department of Chemistry
Title::	Semiclassical Origins of Density Functionals
Abstract::	Since its foundation almost 80 years ago Density Functional Theory (DFT) has gained the status of a successful,widely-used theory in different areas of chemistry and physics.  To improve the predictions of DFT and apply it to ever larger system we have to approximate the components of the energy of a given system accurately and computationally inexpensively.  We show how functionals can be improved by analyzing the semiclassical limit of large particle number [1,2].

16	Prize Winner!
Author(s)::	E. Kalman, K. Healy, Prof. Z. Siwy (email: ekalman@uci.edu)
Affiliation(s)::	Department of Physics and Astronomy
Title::	Tuning of Ion Current Rectification by Signal Mixing
Abstract::	A new way of controlling the rectification of conical nanopores is by applying two periodic rectangular voltage signals of zero mean. We identified frequency ratios and phase differences at which one can enhance rectifying properties of the nanopores.

17
Author(s)::	Michael Kamboures (email: mkambour@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	A Computational Investigation of the Chemistry of NO2 on HNO3/NO3- Surfaces
Abstract::	Nitrous acid is a precursor to hydroxyl radical in urban air. The processes which produce this nitrous acid are unknown. Studies have indicated that photoinduced surface reactions are involved. We investigate this topic using ab initio methods.

18
Author(s)::	Matthew Powell (email: mrpowell@uci.edu)
Affiliation(s)::	Department of Physics and Astronomy
Title::	Ion current oscillations caused by sub-femtoliter volume precipitation in a nanopore
Abstract::	We show ion current oscillations under constant applied voltage through a nanopore. Negative charges on the pore walls allow ion concentrations to rise above Ksp causing precipitates to form and be removed which periodically blocks ion flow.

19
Author(s)::	Yuhong Wang, Kapilanjan Krishan, Prof. Michael Dennin (email: yuhongw@uci.edu)
Affiliation(s)::	Department of Physics and Astronomy
Title::	Statistical Properties of Flowing Foam
Abstract::	We studied the flow properties of bubbles in a parallel bubble raft. A bubble raft is a single layer of bubbles on a water surface. We apply a constant rate of strain to the bubble raft and measure the average velocity of bubbles and the occurrence of T1 events. T1 events are nonlinear rearrangements of bubbles in which bubble switch neighbors. We compared the velocity profiles and T1 event distribution of bubbles under a confined boundary condition (with a glass top) and a free boundary condition (without a glass top). We found both the velocity profiles and the T1 event distribution depend strongly on the presence of a confining plate. The confined boundary (glass top) suppresses the flow significantly even in the quasi-static limit. We also report on the convergence of the average velocity and the velocity fluctuations. We find that the convergence rate (as a function of strain) is independent of the applied rate of strain, but the velocity fluctuations depend on the rate of strain.

20
Author(s)::	Eric Kalman, I. Vlassiouk, Prof. Z. Siwy (email: ekalman@uci.edu)
Affiliation(s)::	Department of Physics and Astronomy
Title::	Nanofluidic transistor
Abstract::	We prepared a bipolar ionic transistor based on a single nanopore in polymer film. The surface of the pore was patterned so that three regions were created with positive, negative and positive charges, respectively, corresponding to emitter, gate and collector of a bipolar transistor.

21
Author(s)::	Karen M. Callahan, Martina Roeselova, Prof. Douglas J. Tobias (email: callahak@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	The Influence of Magnesium Dication on Aqueous Salt Solutions
Abstract::	Field studies and laboratory measurements have demonstrated that molecular chlorine is produced via oxidation of sea salt aerosol by hydroxyl radical.  A surface mechanism for chloride production was proposed based on molecular dynamics simulations of concentrated sodium chloride solutions, which predicted that chloride anions adsorb to the solution-air interface.  Sea water contains a substantial amount of magnesium chloride in addition to sodium chloride.  The present study seeks to quantify the effects of magnesium dications on the interfacial propensity and reactivity of chloride anion.  To this end, molecular dynamics simulations of concentrated magnesium chloride and sodium chloride solutions, as well as a model of sea water containing 85 mol% sodium chloride and 15 mol% magnesium chloride, were performed.  Structural and thermodynamic properties were calculated from the simulations and compared to available experimental data. The simulations show that the presence of magnesium dications does not effect the interfacial distribution of chloride anions.  In addition, the simulations predict that magnesium dications displace sodium cations near the interface in the model sea water system, and the presence of magnesium dications in the subsurface layer results in changes in chloride-chloride coordination.

22
Author(s)::	Viktor Johanek, Ana B. De La Ree, Prof. John Hemminger  (email: vjoh@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	The STM-LITD/FTMS apparatus: ethylene decomposition on Pt(111)
Abstract::	A new UHV instrument has been built in which one can image molecules at an atomic level and then analyze their chemical content.  Ethylene has been adsorbed onto a Pt(111) surface and then thermally dehydrogenated leading to carbon species.  Through subsequent exposures of ethylene, we have observed a change of size and distribution of the carbon particles.

23
Author(s)::	Y. He, Prof. Z. Siwy (email: yhe@uci.edu)
Affiliation(s)::	Department of Physics and Astronomy
Title::	Preparation of Polymer Nanopores Selective for Calcium Ions
Abstract::	Ion selectivity is one of the key properties of ion channels. The main goal of our research was to prepare a synthetic nanopore with high density of COOH groups and check its selectivity towards Ca2+.

24
Author(s)::	Eric Schow, Alfredo Freites, Prof. Doug Tobias, Prof. Stephen White (email: eschow@uci.edu)
Affiliation(s)::	Department of Chemistry
Title::	Arginine Burial in a Lipid Membrane: Structure and Energetics
Abstract::	Experiment shows a surprisingly low free energy penalty for insertion of charged residues into a lipid bilayer. We explore relevant protein-bilayer interactions through molecular dynamics simulations and present structural and energetic results.

isis poster session

December 8, 2006

5:00 - 7:00 p.m.

Location:  1201 Natural Sciences II

This poster session is informal in nature, and it provides an opportunity to learn about current
ISIS member research projects.  This is also a social occasion for ISIS members to get together
to interact - students, postdocs and other group members are especially welcome! 

Posters for the session can be composed of papers presented at recent conferences, or
just a few figures interspersed with brief explanatory prose.

Please submit abstract and presentation information to:

Anne Taub (annetaub@uci.edu) or Diane Stathakis (destatha@uci.edu).

To view a list of poster titles and abstracts, please visit:

http://www.physics.uci.edu/~isis/poster_session.html#program

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ISIS Distinguished Lecturer Award - October, 2006


Reginald Penner, Director of ISIS, presents the ISIS Distinguished Lecturer Award to
University Professor Dr. Michael Grunze, Chair of Applied Physical Chemistry, University of Heidelberg.


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Yountville Conference June 26 - 28, 2006 Napa Valley Lodge in Yountville, California Alexei A. Maradudin, Research Professor of Physics University of California, Irvine Department of Physics and Astronomy email:  aamaradu@uci.edu ......................................................................................................................................................................... The third workshop in a series devoted to Aspects of Rough Surface Scattering and Related Phenomena will be held at the Napa Valley Lodge, in Yountville, California, on June 25-28, 2006.  The previous two in this series of Yountville conferences were held in June, 1996 and October, 2000. This workshop is intended to bring together physicists, engineers, and applied mathematicians for presentations of recent theoretical and experimental results in the field of rough surface scattering.  It will be the third.  The topics to be covered in this workshop fall into four categories.  The first is the direct scattering problem: given a rough surface, what is the scattered field it produces?  The surface in question can bound a homogeneous medium or, more interestingly, an inhomogeneous medium.  Reports on new physical phenomena occurring in  scattering from such surfaces will be sought, as well as on methodological advances in calculations of this scattering, especially in application to two-dimensional rough surfaces. The second category into which the topics to be covered fall is the inverse problem.  The usual formulation of this problem will be addressed, in which some kind of (specified) scattering data are provided and the problem is to reconstruct the surface from which the scattering occurred, or to obtain information about the statistical properties of the surface, e.g. the power spectrum of a randomly rough surface.  Again, reports on methodological advances in solving this problem will be sought.  In addition, attention will be directed toward a variant of the inverse problem in  which the goal is to design a one- or two-dimensional randomly rough surface that produces a scattered field with a specified angular or spatial dependence of its mean intensity, or possesses a specified dependence on the frequency of the incident field for fixed values of the angles of incidence and scattering. The third topic to be discussed at this workshop will be the coherence properties of light scattered from, or transmitted through, a randomly rough surface.  Coherence is the property of light that is most closely related to interference and diffraction.  Controlling the coherence properties of light waves is therefore an important research issue due to the fact that diffraction and interference effects can be seriously affected by the degree of coherence of light waves.  The management of the partial coherence of  light waves is important for applications to displays, lithography, and diffractive optics.  Reports of theoretical and experimental studies of how the  degree of coherence of light interacting with a randomly rough surface can be altered by changing the degree and nature of the roughness will be sought, together with reports describing rough surface-based approaches to the production of partially coherent light. Speckle is often regarded as a nuisance in optical systems.  However, in recent years it has been shown computationally and experimentally that speckle produced in the scattering of  electromagnetic radiation from rough surfaces can be used effectively for tracking targets of one type or another, for example.  The fourth topic to be discussed at this workshop will therefore be speckle, its basic properties and applications. To allow ample time for presentations and for discussions, the number of participants will be limited to 20 individuals working  actively in these fields.  It is proposed that each presentation will be allotted 45 minutes, including discussion.    No proceedings of the workshop will be published.  However, the participants will be required to prepare an extended abstract of their presentation (a minimum of four pages), with references.  A collection of all the abstracts will be distributed to each participant, and to the supporting agencies, and will serve as a record of the meeting. Financial support for this workshop is provided by the Army Research Office,  the Vice Chancellor for Research at the University of California, Irvine, and the Institute for Surface and Interface Science at the University of California, Irvine. We hope that the end result of this meeting will be a good picture of the state of the field at the time of the conference and, even more important, an indication of those existing areas in which further progress is needed, and of new directions for future research. ............................................................................. COORDINATOR INFORMATION: Alexei A.  Maradudin, Research Professor of Physics Telephone number (949) 824-5943 Fax number is (949) 824-2174 e-mail: aamaradu@uci.edu Questions about the workshop can also be emailed to: Jeannie Brown: jmbrown@uci.edu or Anne Taub: annetaub@uci.edu ..................................................................................................................................... ISIS Year End Reception / Poster Session Wednesday, June 14, 2006        5:00 - 7:00 p.m. 1201 Natural Sciences II ::  VIEW AND DOWNLOAD POSTER ABSTRACTS HERE :: The Institute for Surface and Interface Science (ISIS) is hosting a Year-End Reception and Poster Session on Wednesday, June 14 at 5:00 p.m., in 1201 Natural Sciences II.   This catered event will provide an opportunity for ISIS colleagues to discuss their current research projects, exchange ideas, and increase collaborative efforts.   We invite faculty and graduate students who are interested in ISIS to join us for this annual event. Poster Presentations: Graduate students who are interested in presenting a poster outlining their research should enter their poster titles and abstracts using the online registration form. The title and abstract submission deadline is June 7, 2006.   This deadline allows the ISIS staff to create and print a handout for the poster session. Poster set-up can begin at 4:30 p.m. in 1115 Natural Sciences II. Please R.S.V.P. using the online registration form. no later than Wednesday, June 7, 2006. Please contact Anne Taub (annetaub@uci.edu), or if you have any questions regarding this event. ..................................................................................................................................... California Symposium on Nanomagnetism (click here for details) April 10-11, 2006 Natural Sciences II, Room 1201 University of California, Irvine (campus map) **  Online Registration  **  Program Details (updated 4-6-2006) ......................................................................................................................................................................... Many prominent research groups are working on various cutting-edge nanomagnetism problems in University of California. At UC Irvine, for example, significant human and equipment resources have been invested in the last five years in nanoscience, including nanomagnetism. We now have exciting new capabilities and facilities in nanomagnetism, along with robust theoretical tools for predictions and analyses. To produce groundbreaking innovations for the next-generation technologies, it is critical to forge collaborations amongst academic and industrial researchers. The April 10-11, 2006 symposium at UC Irvine, sponsored by UC Discovery Grants, ISIS (a UC Irvine Organized Research Unit), and UC Irvine Office of Research and Graduate Studies, brings together leading scientists in California from several UC campuses, Almadam Research Laboratory in San Jose (IBM and Hitachi Global Systems), Seagate Research Laboratory in Fremont, and industrial researchers from Southern CaliforniaApri area. We will focus on frontier topics such as growth and characterization of nanostructures and progress in theory, and explore new challenges and opportunities in the future. A primary purpose of the symposium is to create new collaborations between researchers on different UC campuses, and to stimulate new interactions between researchers in the UC community and California industry. The program provides the opportunity for questions and informal exchange of information after the talks and during the breaks. In addition, there will be a poster session for attendees, especially graduate students and postdoctoral researchers, to present their latest findings. It is widely believed that revolutionary progress can be made as materials and devices are developed to operate at the nanometer-length scale. Progress in nanomagnetism is particularly rapid at present, primarily motivated by applications such as spintronics, magnetic sensing and ultra-high-density magnetic recording, to cite a few examples. During the past decade applications of nanoscale magnetic devices to data storage have had a revolutionary impact on computers and information technology. California is one of the most active areas in the world in both fundamental explorations and industrial innovations. The Almadam Research Laboratory in San Jose, for example, has been the powerhouse for many major discoveries and subsequent applications of phenomena such as the giant magnetoresistance (GMR) read-head, that has increased the recording density of computer hard discs by a factor >500. These developments by California industry have revolutionized computer technology, resulting in our current hard discs that hold hundreds of gigabytes. NOTE:  This symposium is open to all UC affiliates and industrial researchers in California. There is no charge for attending this symposium but we request all participants to register (click here) before March 15, 2006.  Due to the limits on funding and space, we plan to have approximately 50-60 attendees, including students and postdocs. ..................................................................................................................................... ISIS Poster Session Friday, December 9, 2005 4:00 - 7:00 p.m. Natural Sciences II Patio The December 9, 2005 Poster Session provided an opportunity for ISIS colleagues to discuss their current research projects.  The event was a roaring success with more than 30 posters presented and over 75 researchers present. Thanks to the School of Physical Sciences for use of their lovely conference room 1201 Natural Sciences II, and to the Departments of Physics and Chemistry for their support with materials used at the session.  A special thanks to Professor Penner's group of graduate students assisted with set-up and clean-up with remarkable aplomb. A good time was had by all!! ISIS is hosting a poster session and reception on Friday, December 9, 2005, from 4:00 - 7:00 p.m., on the Natural Sciences II Patio. The poster session is informal in nature, and it provides an opportunity for various people to learn about current ISIS member research projects.  This is also a social occasion for ISIS members to get together to interact - students, postdocs and other group members are especially welcome!  Posters for the session can be composed of papers presented at recent conferences, or just a few figures interspersed with brief explanatory prose. NEW:  This year, awards will be given for posters - more details to follow! Please submit abstract and presentation information to Anne Taub (annetaub@uci.edu) or Diane Stathakis (destatha@uci.edu). To view a list of poster titles and abstracts, please visit: http://www.physics.uci.edu/~isis/poster_session.html ..................................................................................................................................... ISIS Year End Reception Friday, June 17, 2005 3:30 p.m. Frederick Reines Hall Lobby The Institute for Surface and Interface Science (ISIS) is hosting a Year-End Reception and Poster Session on Friday, June 17 at 3:30 p.m., in lobby of Frederick Reines Hall.  This catered event will provide an opportunity for ISIS colleagues to discuss their current research projects.   We invite faculty and graduate students who are interested in ISIS and the soft-matter research group. Poster Presentation: Graduate students who are interested in presenting a poster outlining their research should email their poster titles and abstracts to Alison Lara (laraa@uci.edu), or Anne Taub (annetaub@uci.edu)  The title and abstract submission deadline is June 10, 2005.   This deadline allows the ISIS staff to create and print a handout for the poster session. Please contact Anne Taub (annetaub@uci.edu), or Sue Tunstall (sutunsta@uci.edu), to R.S.V.P., or if you have any questions regarding the event. ..................................................................................................................................... Southern California Symposium on Surface Science April 25, 2005 Natural Science I Building, Room 1114 University of California, Irvine (campus map) Symposium Program Details   |   Online Registration (deadline:  March 31, 2005) program abstracts   |   local accommodations   |   parking   |   directions    Purposes: Surface Science is an extremely important research field. Progress in this area is particularly rapid at the present time, primarily being motivated by innovations in materials and phenomena suitable for industrial applications. Southern California is one of the most active areas in the world where many prominent research groups are working on various cutting-edge surface problems.  This symposium will bring together surface scientists, postdocs and students from neighboring institutes and companies to exchange ideas and to discuss our latest research findings. Particulary, we will focus on frontier topics such as nanocatalysis, oxide surfaces, nanoscale characterization and manipulation, spins and plasmons, reaction dynamics, phonons & excitons, and femtosecond surface chemistry. In addition, there will be a poster session to provide the opportunity for graduate students and postdocs to present their latest research. This symposium will foster/enhance interactions between researchers who are focused on the fundamental studies of surface science and related topics in the Southern California area. ..................................................................................................................................... The Institute for Surface and Interface Science (ISIS) invites you to attend a wine and cheese reception for: Ilya Krivorotov - UCI Nanofaculty Recruit Monday, April 4, 2005 5:00 - 6:00 p.m. ISIS Conference Room 2140 Frederick Reines Hall ISIS will host a wine and cheese reception for nanofaculty recruit Ilya Krivorotov, on Monday, April 4, from 5 to 6 p.m. in the ISIS conference room, 2140 Frederick Reines Hall. We hope you can join us to meet informally with Dr. Krivorotov! The Casimir Effect -  A Symposium March 18, 2005 McDonnell-Douglas Auditorium University of California, Irvine (campus map) Symposium Program Details   |   Online Registration program abstracts   |   local accommodations   |   parking   |   directions   The Casimir Effect Symposium will be held at UC Irvine on Friday, March 18, 2005 to honor the retirement of Physics Professor, Igor  Dzyaloshinskii.   Invited U.S. and international speakers will present their recent work on the Casimir Effect at this day-long symposium. The public is cordially invited to attend the symposium held from 9 a.m. - 5 p.m. in the McDonnell-Douglas Auditorium on the main campus of UC Irvine. The support of The Institute for Surface and Interface Science (ISIS), The Office of Research and Graduate Studies, The School of Physical Sciences, and The Department of Physics and Astronomy is gratefully acknowledged. ..................................................................................................................................... special announcement ISIS Poster Session Friday, December 10, 2004 ISIS is hosting a poster session and reception in the lobby of Frederick Reines Hall on Friday, December 10, 2004, from 4:00 - 6:00 p.m.   The poster session is informal in nature, and it provides an opportunity for various people to learn about current ISIS member research projects.  This is also a social occasion for ISIS members to get together to interact - students, postdocs and other group members are especially welcome! Posters for the session can be composed of papers presented at recent conferences, or just a few figures interspersed with brief explanatory prose. Please submit abstract and presentation information to Anne Taub (annetaub@uci.edu). To view a list of registered attendees, program information, and poster guidelines, please visit: http://www.physics.uci.edu/~isis/poster_session.html .................................................................................................................................... ISIS Year End Reception Wednesday, June 16, 2004 3:30 to 5:00 p.m. Frederick Reines Hall Lobby This catered event will provide an opportunity for ISIS colleagues to discuss their current research projects.  The reception will also provide a forum for discussion regarding next year's ISIS agenda.   In particular, we would like to hear about potential visitors, research projects that might benefit from ISIS' sponsorship, or contributions that you are eager to make to the ISIS Five Year External Review, currently scheduled for Spring, 2005. Please note that your researchers or graduate students are most welcome to join us for this event!   Please contact Anne Taub (annetaub@uci.edu) or Carrie Sullivan (csulliva@uci.edu) if you have any questions regarding the event, or if you you plan to attend. .....................................................................................................................................

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