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Displaying 1576 - 1600 of 3718

Band Offset Determination of Atomic-Layer-Deposited Al2O3 and HfO2 on InP by Internal Photoemission and Spectroscopic Ellipsometry

January 9, 2013
Author(s)
Kun Xu, Oleg A. Kirillov, David J. Gundlach, Nhan V. Nguyen, Pei D. Ye, Min Xu, Lin Dong, Hong Sio
Band offsets at the interfaces of n- and p-type InP ((100) and (111)A) and atomic-layer-deposited (ALD) Al2O3 were measured with internal photoemission and spectroscopic ellipsometry. Similarly, the band offsets at the interface of semi-insulating InP (100

Design and Implementation of Two-Dimensional Polymer Adsorption Models: Evaluating the Stability of Candida Antartica Lipase B at Solid-Support Interfaces by QCM-D

January 4, 2013
Author(s)
Sara V. Orski, Santanu Kundu, Richard Gross, Kathryn L. Beers
A two-dimensional model of a solid-supported enzyme catalyst bead is fabricated on a quartz crystal microbalance sensor to measure in situ stability and mechanical properties of Candida Antartica Lipase B (CAL B) layers under varied conditions relating to

A Unique Photoemission Method to Measure Semiconductor Heterojunction Band Offsets

January 2, 2013
Author(s)
Qin Zhang, Rui Li, Rusen Yan, Thomas Kosel, Grace Xing, Alan Seabaugh, Kun Xu, Oleg A. Kirillov, David J. Gundlach, Curt A. Richter, Nhan V. Nguyen
We report a unique way to measure the energy band offset of a heterojunction by exploiting the light absorption profile in the heterojunction under visible-ultraviolet internal photoemission. This method was used to successfully determine the band

Swelling of ultrathin crosslinked polyamide water desalination membranes

December 27, 2012
Author(s)
Edwin P. Chan, Allison P. Young, Jung-Hyun Lee, Jun-Young Chung, Christopher M. Stafford
We study the water swelling behavior of semi-aromatic crosslinked polyamide ultrathin films in order to characterize the materials properties of the polymer network. Specifically, we utilize X-ray reflectivity and quartz crystal microbalance to measure

Direct Measurement of Intrinsic Dirac Point and Fermi level at Graphene/Oxide interface and Its Band Alignment by Cavity Enhanced Internal Photoemission

December 17, 2012
Author(s)
Kun Xu, Caifu Zeng, Qin Zhang, Rusen Yan, Peide Ye, Kang Wang, Alan C. Seabaugh, Huili G. Xing, John S. Suehle, Curt A. Richter, David J. Gundlach, Nhan V. Nguyen
We report the first direct measurement of the Dirac point, the Fermi level, and the work function of graphene by performing internal photoemission measurements on a graphene/SiO2/Si structure with a unique optical-cavity enhanced test structure. A complete

Differentiation and characterization of isotopically modified silver nanoparticles in aqueous media using asymmetric-flow field flow fractionation coupled to optical detection and mass spectrometry

December 10, 2012
Author(s)
Julien C. Gigault, Vincent A. Hackley
The principal objective of this work was to develop and demonstrate a new methodology for silver nanoparticle (AgNP) detection and characterization based on asymmetric-flow field flow fractionation (A4F) coupled to multiple detectors and using stable

Capturing nanoscale in network gels by microemulsion polymerization

December 3, 2012
Author(s)
Kirt A. Page, John Texter, Dustin England
Difficulties in capturing nanoscale structure by polymerizing microemulsions have persisted with the use of thermal initiation. Bicontinuous microemulsion polymerization with reactive surfactant monomer and cross-linker was done with only a 20% increase in

Relative Rigidity of Cell-Substrate Affects Hepatic and Hepatocellular Carcinoma Cell Migration

December 3, 2012
Author(s)
Martin Y. Chiang, Hongbing Wang, Li Zhong, Qiaoyan Tan, Gurinder K. Singh, Song Li, Li Yang, Yanzi Yangben
Polyacrylamide gels with different stiffness and glass were employed as substrates to investigate how substrate stiffness affects the cellular stiffness of adherent hepatocellular carcinoma (HCCLM3) and hepatic (L02) cells. The interaction of how cell

High-energy Ultra-Small Angle X-ray Scattering Instrument at the Advanced Photon Source

December 1, 2012
Author(s)
Andrew J. Allen, Lyle E. Levine, Fan Zhang, Gabrielle G. Long, Jan Ilavsky, Pete R. Jemian
This paper reports recent tests performed on the Bonse-Hart-type ultra-small angle X-ray scattering (USAXS) instrument at the Advanced Photon Source with higher-order reflection optics — Si (440) instead of Si (220) — and with X-ray energies greater than
Displaying 1576 - 1600 of 3718
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