NIST Technicalendar April 13 to April 17, 2009 The NIST Technicalendar is issued each Friday. All items MUST be submitted electronically from this web page by 12:00 NOON each Wednesday unless otherwise stated in the NIST Technicalendar. The address for online weekly editions of the NIST Technicalendar and NIST Administrative Calendar is: http://www.nist.gov/tcal/.

In this Issue: Meetings at NIST Meetings Elsewhere Announcements Talks by NIST Personnel NIST Web Site Announcements NIST Administrative Calendar (current)   NIST Vacancy Announcements (current)

Also available: Previous Issues of the Technicalendar Quick Technicalendar (current) Last week's Quick Technicalendar Last week's Technicalendar Detailed Search NIST Journal of Research (Current TOC) Change User Options

No Scheduled Events

9:00 AM - 8h Symposium on Identity and Trust on the Internet
10:00 AM - CSTL Colloquium: Routine High Performance LC/MS Characterization of Biotherapeutics
10:45 AM - Extended Solids Containing Periodic Arrays of Transition-Metal Oxide Magnetic Nanostructures

10:30 AM - Spatial Light Modulators and Photonic Crystal Integrated Microsystems
10:45 AM - Two-dimensional Ordering in Langmuir Monolayer and Langmuir-Blodgett Films
1:00 PM - VOC Emission Testing of Building Materials in Europe and the USA - What We Can Learn from Each Other
2:00 PM - Cryoelectronic Interfaces for Quantum Computing
2:00 PM - Advancements in Nanoindentation at the USFS Forest Products Laboratory
3:00 PM - 5th Annual Admin. Prof. Reception

10:30 AM - Interpretation of Complex Spectra: Some Recent Developments
1:30 PM - MAGNETIC OSCILLATIONS AND QUANTUM HALL EFFECT IN EPITAXIAL GRAPHENE USING A CORBIO DEVICE

10:30 AM - Cancer, Trauma, and Stroke: Imaging Biomarkers are Changing Them All

4/13 -- MONDAY

No Scheduled Events

4/14 -- TUESDAY

9:00 AM - COMPUTER SECURITY DIVISION SEMINAR: 8h Symposium on Identity and Trust on the Internet
This year's annual symposium is more engaging and valuable than ever. We have panels that approach the questions of the day from diverse viewpoints. Topics include responding to the recent practical attacks on browser security and CAs that use md5 hashes; application-specific concerns; and the various alternatives for authentication, federation, authorization, and attribute management. Keynote presentations will come from security and systems wizard Peter Neumann of SRI, and from Dan Blum, identity guru at the Burton Group, who has just finished a major independent review of Federal Identity Management Programs. And of course as always we have cutting-edge researchers presenting new peer-reviewed papers on a wide variety of topics. Come, network with your colleagues, and consider bringing your own short talk for the Rump session.
Dan Blum , Burton Group. Peter Neumann , SRI International.
Administration Bldg, Green Auditorium. (NIST Contact: Sara Caswell, 301-975-4634, sara@nist.gov) http://middleware.internet2.edu/idtrust/2009/

10:00 AM - CHEMICAL SCIENCE AND TECHNOLOGY LABORATORY OFFICE SEMINAR: CSTL Colloquium: Routine High Performance LC/MS Characterization of Biotherapeutics
John Gebler , Director, Waters Biopharmaceutical Sciences, Milfod, MA. Elizabeth Gildea
227 Bldg, Rm. A202. (NIST Contact: Michael Amos, 301-975-8631, mamos@nist.gov)

10:45 AM - NIST CENTER FOR NEUTRON RESEARCH SEMINAR: Extended Solids Containing Periodic Arrays of Transition-Metal Oxide Magnetic Nanostructures
Transition-metal oxide (TMO) compounds are attractive due to their structural versatility and unique chemical and physical properties, including superconductivity, ferroelectricity, nonlinear optical behavior, ionic conductivity and catalytic activity.1 Incorporation of TMOs with unpaired d-electrons can give rise to magnetic materials of fundamental and technological importance. Over the last two decades, much research has been focused in the area of molecular-based magnetic solids, such as single-molecule magnets (SMMs) and single-chain magnets (SCMs). These materials have organic-based nonmagnetic ligands allowing structural confinement of the TMO clusters and chains, respectively. Due to the low-dimensional nature of these materials and large magnetic anisotropy, they often exhibit slow relaxation of magnetization resulting in hysteresis, a phenomenon that, until the early 90's, was associated only with bulk magnetic materials.2 From these molecular-based magnets we have learned that compounds containing finite numbers of coupled paramagnetic centers can also exhibit unusual quantum behaviour.3 It is thought that comparable magnetic properties can be achieved in extended solids containing low-dimensional magnetic nanostructures.4 In order to create structural and electronic confinement of the TMO units, rigid nonmagnetic, inorganic oxyanions, XOnm-, (where X can be a fully oxidized early transition metal, such as V5+, or a neighboring main-group element such as P, Si, or As) are utilized. High-temperature, molten-salt methods are employed to grow large single crystals of these refractory oxides for structure and property characterization. Recent results have shown that the inclusion of molten salt can also aid in the formation of low-dimensional frameworks5 such as high nuclearity TMO clusters. TMO polyhedra can link through a variety of different bridging modes (?2, ?3, ?4, etc.) giving rise to extended solids having very complex magnetic properties. Structural versatility found within this system has led to a large number of interesting framework formations including those containing triangular-based magnetic lattices. In this seminar the presenter will discuss high-temperature, solid-state synthesis, and the structure and properties of some newly synthesized extended solids containing low-dimensional magnetic nanostructures. References 1.(a) Salamon, M. B.; Jaime, M. Rev. Mod. Phys. 2001, 73, 583-628. (b) Cava, R. J. J. Am. Ceram. Soc. 2000, 83, 5-28. (c) Nanamatsum S.; Kimura, M.; Doi, K.; Matsushita, S.; Yamada, N. Ferroelectrics 1974, 8, 511-513. (d) Halasyamani, P. S.; Poeppelmeier, K. R. Chem. Mater. 1998, 10, 2753-2769. (e) Boivin, J. C.; Mairesse, G. Chem. Mater. 1998, 10, 2870-2888. (f) Pena, M. A.; Fierro, J. L. G. Chem. Rev. 2001, 101, 1981-2017. (g) Aranda, M. A. G.; Attfield, J. P.; Bruque, S.; von Dreele, R. B. J. Chem. Soc., Chem. Commun. 1994, 155-156. 2.(a) Friedman, J. R.; Sarachik, M.P.; Tejada, J.; Ziolo, R. Phys. Rev. Lett. 1996, 76, 3830-3833. (b) Thomas, L; Lionti, F.; Ballour, R.; Gatteschi, D.; Sessoli, R.; Barbara, B. Nature. 1996, 383, 145-147. (c) Wernsdorfer, W.; Aliaga-Alcalde, N.; Hendrickson, D. N.; Christou, G. Nature. 2002, 416, 406-409. (d) Tasiopoulos, A. J.; Vinslava, A.; Wernsdorfer, W.; Abboud, K. A,; Christou, G. Angew. Chem. Int. Ed. 2004, 43, 2117- 2121. (e) Murugesu, M.; Habrych, M.; Wernsdorfer, W.; Abboud, K. A.; Christou, G. J. Am. Chem. Soc. 2004, 126, 4766-4767. 3.Gatteschi, D.; Sessoli R. Angew. Chem. Int. Ed. 2003, 42, 268-297. 4.(a) Hwu, S.-J. Chem. Mater. 1998, 10, 2846-2859. (b) Hwu, S.-J.; Ulutagay-Kartin, M.; Clayhold, J. A.; Mackay, R.; Wardojo, T. A.; O'Connor, C. T.; Krawiec, M. J. Am. Chem. Soc., 2002, 124, 12404-12405. (c) Ranmohotti, K.G S.; Mo, X; Smith, K. M.; Hwu, S.-J. Inorg. Chem., 2006, 45, 3665-3670. 5.Queen, W. L.; West, J. P.; Hwu, S.-J.; VanDerveer, D. G.; Zarzyczny, M. C.; Pavlick, R. A. Angew. Chem. Int. Ed. 2008, 47, 3791-3794.
Wendy Queen , Clemson University. ,.
235 Bldg, Rm. E100. (NIST Contact: Craig Brown, 301-975-5134, craig.brown@nist.gov)


4/15 -- WEDNESDAY

10:30 AM - CNST NANOFABRICATION RESEARCH GOUP SEMINAR: Spatial Light Modulators and Photonic Crystal Integrated Microsystems
The ability of Spatial Light Modulators (SLMs) to modulate the amplitude and/or phase of light make it a compelling technology for a variety of applications in displays, adaptive optics and communications. An important functional advantage of MEMS implementation is that the small size and mass of the elements allow high switching speeds. This also leads to a compact design resulting in systems that are much more economical to fabricate with the millions of elements required of some applications. The size, complexity, and required precision of the devices introduced in this talk show the unique capability of MEMS technology but also its many technical challenges. In this talk, I will first present my PhD dissertation research on the design and fabrication of SLMs for applications in adaptive optics and optical maskless lithography. I will present a tip-tilt-piston mirror array fabricated using multi-layer bonding techniques and self-aligned combdrives for phase I of the DARPA CCIT (Coherent Communication, Imaging and Targeting) program. I will also describe our development of a large-scale micromirror array with dual-lever piston actuators for optical pattern generation at DUV wavelengths sponsored by SRC (Semiconductor Research Corporation). More recent work with Agilent Labs on the development of tunable filters with vertical mirrors assembled on movable MEMS platforms for applications in communications and spectroscopy will also be presented. It has been shown theoretically and experimentally that broadband mirrors with high reflectivity can be made from free-standing 2-D photonic crystal (PC) slabs and from PCs placed on a thin dielectric film on a silicon substrate. By controlling the structure and geometrical dimensions, PC slabs can support guided resonances that couple to external radiation in ways that profoundly change its optical properties. This can be utilized to design compact optical devices such as mirrors, filters, lasers, and sensors. The main advantage of 2-PC slabs is that they can be designed to achieve comparable performance of 1-D PCs, or Bragg-stacks, but in a more compact form. As another part of this talk, I will present the many applications of 2-D photonic crystal slabs for integrated microsystems and my work on high reflectivity broadband photonic crystal MEMS scanners using thin-film and monolithic SCS 2-D PC slabs. Il Woong Jung received the B.S. degree and M.S. degree in physics and applied physics from Yonsei University, Seoul, Korea, in 1997 and 2001 respectively. He served in the Korean military from 1998 to 2000. He also received the M.S. and Ph.D. degrees in electrical engineering from Stanford University, Stanford, CA, in 2003 and 2007 respectively. He is currently a postdoctoral scholar in electrical engineering at Stanford University.
Il Woong Jung , Department of Electrical Engineering, Stanford University,.
Bldg. 217, Rm. H107. (NIST Contact: Vladimir Aksyuk, 301-975-2867, vladimir.aksyuk@nist.gov)

10:45 AM - NIST CENTER FOR NEUTRON RESEARCH SEMINAR: Two-dimensional Ordering in Langmuir Monolayer and Langmuir-Blodgett Films
Molecular materials and nanoparticles having hydrophilic and hyphobic parts easily form monolayer at liquid-vapor and liquid-liquid interfaces. One can deposit multilayered films with these monolayers by transferring these materials sequentially on a substrate. Fascinating ideas of two-dimensional physics can be studied using these monolayers and multilayers. We shall discuss our recent results of synchrotron x-ray and polarized neutron scattering studies to understand two-dimensional structural and magnetic ordering, respectively, in these systems.
Milan Sanyal , Saha Institute of Nuclear Physics, India. ,.
235 Bldg, Rm. E100. (NIST Contact: Sushil Satija, 301-975-5250, sushil.satija@nist.gov)

1:00 PM - BUILDING ENVIRONMENT DIVISION SEMINAR: VOC Emission Testing of Building Materials in Europe and the USA - What We Can Learn from Each Other
Reducing the emissions of volatile organic compounds (VOCs) from building materials and furnishings is a major focus of green or sustainable building programs and rating systems. These reductions are motivated by the goal of improving indoor environmental conditions, and hopefully reducing building ventilation rates and the associated energy consumption for space conditioning. This presentation will provide an overview of the major low VOC rating schemes in Europe and the latest trends in these programs. Differences and similarities of these programs with those in the USA will also be discussed, as well as the challenges facing product manufacturers, designers and others in dealing with these different schemes. The discussion will also address the use of an international test house for assessing these testing schemes as well as quality issues of VOC emission testing. Finally, new ideas for further development of low VOC emissions specifications will be presented.
Reinhard Oppl , Business Development Manager/Eurofins Product Testing, Denmark.
224 Bldg, Rm. B245. (NIST Contact: Cynthia Reed, 301-975-8423, chreed@nist.gov)

2:00 PM - ATOMIC PHYSICS DIVISION SEMINAR: Cryoelectronic Interfaces for Quantum Computing
Low temperature operation of MOS components has become a field of increasing interest over the last decade. NASA's moon and Mars missions have focused on 37K operation of conventional components. Alternate proposals for high performance computing such as solid-state quantum computing and hybrid Josephson junction-CMOS technologies also will likely rely on very low temperature CMOS operation ranging to as low as ~100 mK. Deeply scaled MOSFETs function at low temperatures, however, the reduction in temperature introduces both changes in the classic behavior (e.g., higher mobility and shifts in threshold voltage) as well as introduces new effects especially in non-optimized structures for cryogenic operation (e.g., possible hysteresis and kink effects). In this presentation, we explain some of the underlying physics, which is necessary to provide accurate models of low temperature performance in order to achieve first-pass design of integrated circuits. And there is some "new physics" (and new numerics!) needed to achieve this goal. These topics are the subject of this talk.
Marty Peckerar , University of Maryland.
Physics Building, Room B145. (NIST Contact: Neil Zimmerman, 301-975-5887, neil.zimmerman@nist.gov)

2:00 PM - MATERIALS AND CONSTRUCTION RESEARCH DIVISION SEMINAR: Advancements in Nanoindentation at the USFS Forest Products Laboratory
With indents approximately 1 µm across, nanoindentation is capable of probing the properties (elastic modulus and hardness) of micron-sized domains in wood. However, unlike traditional nanoindentation specimens, the nanoindentation surfaces in wood are not homogeneous and indents placed in the micron-sized domains are near free edges and heterophase interfaces. Even though the indents do not overlap these edges, both the elastic and plastic responses measured by the indenter are affected by their presence. In addition, the open cellular structure of wood leaves it susceptible to specimen-scale flexing during testing. We have recently shown that both specimen-scale flexing and far-field edge effects can be accounted for simultaneously by introducing a structure compliance into the analysis. The efficacy of our analysis was experimentally demonstrated on model systems, including a simple silicon wafer bridge specimen to simulate specimen-scale flexing, and near the free edges of fused silica and poly-methylmethacrylate (PMMA) specimens. The analysis was also supported by elasticity theory. Similar to polymers, the elastic modulus and hardness of wood cells are time-dependent. To characterize the time-dependent hardness, we developed the broadband nanoindentation creep (BNC) technique capable of determining hardness over 5 decades of indentation strain rate. The efficacy of BNC was demonstrated in the PMMA specimen. By comparing the BNC data to literature uniaxial flow stress data, the relationships between hardness and flow stress were investigated.
Joseph Jakes , Research Engineer, Performance Enhanced Biopolymers Group, USFS Forest Products Laboratory,.
226 Bldg, Rm. B221. (NIST Contact: Joannie Chin, 301-975-6815, joannie.chin@Nist.gov)

3:00 PM - OFFICE OF THE DIRECTOR, NIST SEMINAR: 5th Annual Admin. Prof. Reception
. . , ..
l0l Bldg, Rm. Cafeteria. (NIST Contact: Suzie Price, 301-975-3827, suzie.price@nist.gov)


4/16 -- THURSDAY

10:30 AM - ATOMIC PHYSICS DIVISION SEMINAR: Interpretation of Complex Spectra: Some Recent Developments
The Racah-Slater parametric method of interpreting complex spectra has guided the search for energy levels in heavy atoms for more than sixty years. Advances in lanthanide spectra, where configurations with several open subshells often occur, have resulted in discovery of the 4fN ground configurations of some triply-ionized ions, such as 4f3 of the free ion Nd3+, the host of the lasing transition in Nd/glass and Nd/YAG lasers. Configurations with an open 5p5 core have also been located in several ions. This talk will update recent progress in this area.
Jean-Francois Wyart , Physicist/NIST.
221 Bldg, Rm. B145. (NIST Contact: Joseph Reader, 301-975-3222, joseph.reader@nist.gov)

1:30 PM - CNST ELECTRON PHYSICS GROUP SEMINAR: MAGNETIC OSCILLATIONS AND QUANTUM HALL EFFECT IN EPITAXIAL GRAPHENE USING A CORBIO DEVICE
Whereas beautiful quantum Hall plateaus have been observed in exfoliated graphene samples on SiO2 substrates, the magneto-transport oscillations are not fully developed for epitaxial graphene samples in Hall bar geometries. In an effort to understand the origin of this difference, epitaxial graphene samples have been made in Corbino ring structures with metallic inner and outer electrodes for current or voltage measurements. An azimuthal current is generated in the bulk of the graphene ring by driving a 50 G AC magnetic field at a few kHz. A Hall effect leads to a radial current or voltage depending on the impedance of the measurement circuit. The voltage or current are measured using lock-in techniques, which enables to separate in phase and quadrature signals. In an "optimal configuration", the observed oscillations of the in phase signal are close to 100%, and the quadrature part is consistent with a quantum Hall effect with a broadening of the Landau levels of the order of 100K (10meV). There is no significant difference in the oscillations observed in the Hall current and Hall voltage. The presence of a sizable magnetic flux enclosed by the measurement leads generates an additional radial electric field in the sample which made the separation of longitudinal and Hall signals problematic. This problem has now been corrected. For Hall measurements in Hall bars, the transport takes places mostly at the edges. This is not the case in Corbino ring geometries. This is probably a key point in explaining the difference between both geometries. A percolation model for the Hall effect appears to us the most appropriate to describe this experiment on a nearly "macroscopic" ring structure.
Laurent Lévy , Professor, Institute Neél/CNRS, Université Joseph Fourier, France,. ,.
Bldg.217, Rm.H107. (NIST Contact: Joseph Stroscio, 301-975-3716, joseph.stroscio@nist.gov)


4/17 -- FRIDAY

10:30 AM - NIST COLLOQUIUM SERIES: Cancer, Trauma, and Stroke: Imaging Biomarkers are Changing Them All
You might think that imaging biomarkers are the holy grail of clinical medicine or that some advocates have overstated their potential. But, despite a conspicuous lack of standards, balkanization of specialty medicine, a faltering economy, and some initial missteps, imaging biomarkers are fundamental to achieving the promise of personalized medicine. The need for imaging biomarkers arises from an aging population, cost concerns, idiosyncratic effects of drugs, and technological opportunities. We could move a lot faster if a few impediments were addressed. Time is not on our side, so action is needed sooner than later.
Michael Vannier, M.D. , Diagnostic Radiology Department, University of Chicago Medical Center.
Administration Building, Green Auditorium. (NIST Contact: Kum Ham, 301-975-4203, kham@nist.gov)
Special Assistance Available


ADVANCE NOTICE

4/21/09 10:00 AM - CERAMICS DIVISION SEMINAR: Nanoscale Mechanical Properties with Quantitative AFM Methods
MSEL NANOMECHANICS SEMINAR The superb spatial resolution and imaging capability of the atomic force microscope (AFM) make it an attractive tool for investigating nanoscale mechanical properties. One AFM method that shows promise for quantitative property data is contact resonance force microscopy (CR-FM). In this approach, the cantilever's resonant frequencies are measured while the tip is in contact in order to determine the local contact stiffness. Nanomechanical information is obtained from the contact stiffness with a suitable contact mechanics model. We will describe our work to develop CR-FM metrology and apply it to material systems. We explain the basic theoretical and experimental concepts, and show ways to implement them for accurate, reliable measurements in specific applications. New extensions of the original approach are also presented, for instance to enable measurement of viscoelastic properties. Work on quantitative imaging is also discussed. CR-FM images enable maps of the spatial distribution in properties, for instance to characterize the interphase region of a fiber-reinforced composite and to examine the adhesion of buried interfaces. Such mapping capabilities facilitate new studies of nanoscale mechanical behavior in a variety of emerging applications.
Donna Hurley , Materials Reliability Division, NIST/MSEL.
Materials Bldg, Rm. A250. (NIST Contact: Robert Cook, 301-975-3207, robert.cook@nist.gov)

4/21/09 10:30 AM - ITL SEMINAR SERIES: Visual Analytics
"Visual Analytics" an interactive, thought compelling presentation on the use of various visualization and representation techniques for understanding a variety of domains ranging from financial crimes and money laundering to narcotics-trafficking and counter-terrorism. The presentation will provide a number of real-world scenarios that challenge the audience participants to try and interpret the results and explain the outcomes. Mr. Westphal emphasizes there are no "right answers" and there are no "wrong answers" only subjective interpretation within the context of the analysis/data. The goal of this presentation is to offer alternative interpretations for obvious situations and complex analytical scenarios. Much of the content presented is based on Mr. Westphal's recent book, "Data Mining for Intelligence, Fraud & Criminal Detection: Advanced Analytics & Information Sharing Technologies" (CRC Press, December 2008). Bio: Chris Westphal is co-founder and CEO of Visual Analytics Inc. (VAI), a provider of visualization software, information sharing systems, and advanced analytical training. His clients include federal and state/local law enforcement including fusion centers, all major intelligence agencies, the U.S. Department of Defense, and international Financial Intelligence Units (FIUs). Mr. Westphal has authored numerous publications and several books including Data Mining for Intelligence, Fraud & Criminal Detection: Advanced Analytics & Information Sharing Technologies (Westphal, CRC Press, 2008); Data Mining Solutions: Methods and Tools for Solving Real World Problems (Westphal/Blaxton, Wiley, 1998); and Readings in Knowledge Acquisition: Current Practices and Trends (McGraw/Westphal, Ellis Horwood Limited, 1990). He also authored the "Analyzing Intelligence Data: Next Generation Technologies for Connecting the Dots" chapter in Net-Centric Approaches to Intelligence and National Security (Ladner/ Petry, Springer 2005).
Chris Westphal , Co-Founder and CEO, Visual Analytics Inc..
Administration Bldg, Lecture Rm. D. (NIST Contact: Larry Reeker, 301-975-5147, larry.reeker@nist.gov)

4/22/09 1:30 PM - OFFICE OF THE DIRECTOR, NIST SEMINAR: NIST Town Hall Meeting
Dr. Gallagher will provide staff with an update on safety, budget, and priority issues.
Patrick Gallagher , NIST, Deputy Director.
Administration Bldg, Red Auditorium. (NIST Contact: Denise Herbert, 301-975-2300, dherbert@nist.gov)
Special Assistance Available

4/23/09 10:30 AM - SIGMA XI COLLOQUIUM: Coherence, Correlation, and Control in a Quantum Dot Molecule
A semiconductor quantum dot is like an artificial solid state "atom". Two dots separated by a thin tunneling barrier form a "molecule".  Moreover, the spin of a single electron in a quantum dot provides a coherent quantum memory – one that can be controlled and measured optically. I will present our efforts to develop the singly charged InAs/GaAs quantum dot as a qubit, and our recent results on coupling two spins in a self-assembled quantum dot molecule.
Dan Gammon , Naval Research Laboratory.
Administration Bldg, Lecture Rm. A. (NIST Contact: Dave Holbrook, 301-975-5202, dave.holbrook@nist.gov)
Special Assistance Available

4/27/09 12:00 PM - OPTICAL TECHNOLOGY DIVISION SEMINAR: Spectrophotometry Workshop
The Spectrophotometry Workshop, sponsored by the Optical Technology Division at NIST, targets engineers, scientists, technicians, managers, or others involved in the design or use of optical instrumentation, optical testing, or physical sciences in which optical properties of materials are important. The format of the workshop includes lectures and closely-related laboratory exercises. The purpose of the workshop is to familiarize the students with the fundamentals of science and technology related to the accurate measurement of optical properties of materials. Upon completion of the workshop, the student should have a good understanding of the theory and practice of spectrophotometry using dispersive and Fourier-transform techniques, as well as optical scatterometry. Particular emphasis is placed on the evaluation of uncertainties in transmittance, reflectance, and Bidirectional Reflectance Distribution Function (BRDF) measurements. To register, go to http://www.nist.gov/public_affairs/confpage/090427.htm and follow the instructions.
Simon Kaplan , Physicist. David W. Allen, Thomas A. Germer, Leonard M. Hannsen, Maria E. Nadal, Eric L. Shirley, Howard W. Yoon
Metrology Building, Room B343. (NIST Contact: Simon Kaplan, 301-975-2336, simon.kaplan@nist.gov) http://physics.nist.gov/Divisions/Div844/spsc.html

4/30/09 10:30 AM - CNST NANOFABRICATION RESEARCH GROUP SEMINAR: Materials Challenges in Nanostructured ZnO-Conjugated Polymer Photovoltaic Devices
It has been widely recognized that increasing the sources of clean energy is absolutely critical for maintaining living standards while halting environmental degradation. Solar energy holds a great promise as a clean energy source, but current technologies are too expensive for wide usage. In addition to traditional semiconductor solar cells, organic photovoltaics (OPVs) have been targeted for inexpensive, lightweight applications, such as consumer electronics and field deployable sensors. A subset of OPVs, called hybrid solar cells, uses a wide bandgap oxide semiconductor as the electron acceptor. They take advantage of the environmental stability and high electron mobilities of metal oxide semiconductors, while largely retaining the solution-based processing available to organic semiconductor devices. In addition, the use of ordered nanostructures increases the area of the heterojunction, resulting in increased dissociation of photogenerated excitons and collection of charges. We focus on nanostructured ZnO – polythiophene (P3HT) heterojuctions. The challenges are to form oxide nanostructures with spacings that match the exciton diffusion length in conjugated polymers (~ 10 nm), to infiltrate high-molecular weight polymer in the dense oxide matrix, and to achieve efficient charge transfer at the heterojunction interface. In this talk, I will discuss progress made on each of the challenges and discuss future directions.
Julia W. P. Hsu , Sandia National Laboratories.
Bldg. 217, Rm. H107. (NIST Contact: Nikolai Zhitenev, 301-975-6039, nikolai.zhitenev@nist.gov)

5/1/09 10:30 AM - NIST COLLOQUIUM SERIES: Beyond Watson and Crick: DNA as a Building Material
Nearly 30 years ago, Ned Seeman proposed to use DNA as a set of programmable molecular tinkertoys. His goal was to create 3D latticeworks for protein crystallography and scaffolds for nanoelectronic devices. Today, such crystals have been achieved---and much more. We can now fold long strands of DNA, origami-like, into any desired 2D or 3D shape, and these 100 nm single molecules can be decorated with components at 5 nm resolution. How will we use these structures, turn them into functional devices, and integrate them with conventional microfabrication? Initial attempts to answer these questions will be discussed, including the precise positioning of DNA origami on silicon and the use of DNA origami to create a carbon nanotube field effect transistor.
Paul W.K. Rothemund , Computation and Neural Systems Department, California Institute of Technology.
Administration Building, Green Auditorium. (NIST Contact: Kum Ham, 301-975-4203, kham@nist.gov)
Special Assistance Available

---

MEETINGS ELSEWHERE


4/13 -- MONDAY

11:00 AM - CARNEGIE INSTITUTION OF WASHINGTON/GEOPHYSICAL LAB. SEMINAR: PREDICTION OF NOVEL CRYSTAL STRUCTURES AT HIGH PRESSURE
A.R. Oganov , State U of NY at Stony Brook.
Bldg, Rm..
Greenewalt Bldg., GL-DTM Grounds, Carnegie Institution of Washington, DC. (NIST Contact: A. Goncharov, 202-478-8900, seminar@lists.ciw.edu)



4/14 -- TUESDAY

No Scheduled Events

4/15 -- WEDNESDAY

8:30 AM - FIRST UNIVERSITY OF MARYLAND SYMPOSIUM ON THEORETICAL CHEMISTRY
The Department of Chemistry and Biochemistry, University of Maryland announces the First University of Maryland Symposium on Theoretical Chemistry to be held on April 15, 2009, on the topic "Water: From the Molecule to the Macroscopic." This one-day symposium will include invited presentations by Joel Bowman (Emory University), Millard Alexander (University of Maryland), Kenneth Jordan (University of Pittsburgh), Ilan Benjamin (University of California, Santa Cruz), John Weeks (University of Maryland), Lawrence Pratt (Tulane University), and a featured talk by James Skinner (University of Wisconsin) on the topic "Water: Hydrogen Bonding and Vibrational Spectroscopy, in the Bulk Liquid and at the Liquid/Vapor Interface."
. . , ..
Bldg, Rm..
Marker Seminar Room (Room 0112 Chemistry Bldg.), Department of Chemistry and Biochemistry. (NIST Contact: Millard Alexander, mha@umd.edu, .) http://www.chem.umd.edu/groups/alexander/theorysymposium1/



4/16 -- THURSDAY

No Scheduled Events

4/17 -- FRIDAY

No Scheduled Events

ADVANCE NOTICE

No Scheduled Events

---

TALKS BY NIST PERSONNEL

CLOTEAUX, B. : GENERATING NETWORK MODELS.
New Mexico State University, Computer Science Dept. Colloquium, Las Cruces, NM, 4/15.

ALLEN, D. : HYPERSPECTRAL PROJECTION OF A CORAL REEF SCENE USING THE NIST HYPERSPECTRAL IMAGE PROJECTOR.
SPIE Defense Security and Sensing Conference, Orlando World Center Marriott Resort and Convention Center, Orlando, FL, 4/15.

KLINE, R. : STRUCTURE-PROPERTY RELATIONSHIPS TO ENABLE ORGANIC PHOTOVOLTAICS.
Materials Research Society Spring Meeting, San Francisco, CA, 4/16.

WYART, J. : INTERPRETATION OF COMPLEX SPECTRA: SOME RECENT DEVELOPMENTS.
(Contact Joseph Reader, x3222), 221/B145 10:30am, 4/16.

GERGEL-HACKETT, N. (Co-Authors: B.Hamadani B.Dunlap ) Suehle, J.S, Richter, C.A, Hacker, C.A, Gundlach, D.J : FLEXIBLE SOLUTION-PROCESSED TIO2-BASED MEMORY.
2009 Materials Research Society Spring Meeting, San Fransisco, CA, 4/16.

WU, W. : CHAIN DYNAMICS IN DN-GELS.
International Conference on Deformation, Yielding and Fracture of Polymers, Kerkrade, Netherlands, 4/17.

ZHOU, J. : PROBE MECHANICAL RESPONSE OF 1D POLYMER NANOWIRES.
Materials Research Society Spring Meeting, San Francisco, CA, 4/17.

SZAKAL, C. : ANALYSIS & MECHANISMS OF RDX ION FORMATION IN DESORPTION ELECTROSPRAY IONIZATION (DESI).
DIET XII, Pine Mountain, GA, 4/19.

---

ANNOUNCEMENTS

VISITOR REGISTRATION FOR NIST EVENTS
Because of heightened security at the NIST Gaithersburg site, members of the public who wish to attend meetings, seminars, lectures, etc. must first register in advance. For more information please call or e-mail the "NIST Contact" for the particular event you would like to attend.
NIST Contact: . ., ., .

PUBLICATIONS PRINTING DEADLINE AUGUST 14, 2009
August 14 is the last day in FY 2009 to submit materials using FY 2009 funds to the Electronic Information and Publications Group (EIPG) for printing at the Department of Commerce or Government Printing Office. To assure timely processing, bring your Editorial Review Board-approved document or administrative printing job and appropriate paperwork to the EIPG office by close of business on Friday, August 14, 2009. The office is located on the mezzanine floor of the NIST Research Library in the Administration Building, Room E220. Questions? Ilse Putman, x2780 or Barbara Silcox, x2146.
NIST Contact: Ilse Putman, 301-975-2780, ilse.putman@nist.gov

---

NIST WEB SITE ANNOUNCEMENTS

ISD NEWSCENTER
Keep up with NIST Research Library news! Read/subscribe to ISD NewsCenter.
NIST Contact: nancy allmang, 301-975-4189, nancy.allmang@nist.gov

---

For more information, contact Ms. Sharon Hallman, Editor, Stop 2500, National Institute of Standards and Technology, Gaithersburg MD 20899-2500; Telephone: 301-975-TCAL (3570); Fax: 301-926-4431; or Email: tcal@nist.gov.

All lectures and meetings are open unless otherwise stated.

---

NVL Webmaster