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Displaying 1301 - 1325 of 1926

Systematic oxidation of polystyrene by ultraviolet-ozone,characterized by near edge x-ray absorption fine structure and contact angle

August 5, 2008
Author(s)
Daniel A. Fischer, Robert Klein, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart
The process of implanting oxygen in polystyrene (PS) via exposure to ultraviolet-ozone (UV-O) was systematically investigated using the characterization technique of near edge x-ray absorption fine structure (NEXAFS). Samples of PS exposed to UV-O for 10s

Diffusive and convective mass transfer in two-phase flow in microchannels

August 3, 2008
Author(s)
Steven D. Hudson, Jai A. Pathak, Jeffrey D. Martin
The kinetics of mass transfer from one phase to another is monitored in flow. The time-dependent interfacial tension between water and oil (determined from drop deformation dynamics in situ) serves as a measure of the butanol concentration within the drop

Nanoimprint Lithography and the Role of Viscoelasticity in the Generation of Residual Stress in Model Polystyrene Patterns

June 10, 2008
Author(s)
Yifu Ding, Hyun Wook Ro, Jing N. Zhou, Brian C. Okerberg, Jack F. Douglas, Alamgir Karim, Christopher L. Soles
Understanding polymer deformation during the nanoimprinting process is key to achieve robust polymer nanostructures. Information regarding the process can be extracted from monitoring the decay of the imprinted polymer patterns during thermal annealing. In

The Role of Folding in the Degradation of Ballistic Fibers

May 19, 2008
Author(s)
Walter G. McDonough, Gale A. Holmes, Jae Hyun Kim, Derek L. Ho
Research has indicated that the folding of ballistic fibers comprising soft body armor may be a factor in the performance deterioration that has been observed. To quantify the impact of this failure mechanism on body armor performance, an apparatus was

The Impact of the Dielectric / Semiconductor Interface on Microstructure and Charge Carrier Transport in High-Performance Polythiophene Transistors

May 14, 2008
Author(s)
Youngsuk Jung, Regis J. Kline, Eric K. Lin, Daniel A. Fischer, Michael F. Toney, Martin Heeney, Iain McCulloch, Dean DeLongchamp
The performance of organic field-effect transistors (OFETs) significantly depends on the properties of the interface between the semiconductor and gate dielectric. Here, we study the impact of chemically modified and morphologically controlled dielectrics

EVALUATION OF MULTI-SAMPLE MICRO-CAPILLARY RHEOMETER

May 5, 2008
Author(s)
Doyoung Moon, Anthony J. Bur, Kalman D. Migler
We present a Multi-sample Micro-capillary Rheometer (MMR) which is capable of measurements over a broad range of temperatures, viscosities and shear rates. The instrument is simple as the flow is generated by external gas pressure and the shear rate is

Nanotwin formation and its physical properties and effect on reliability of copper interconnects.

May 3, 2008
Author(s)
Di Xu, Vinay Sriram, Vidvuds Ozolins, Jenn-Ming Yang, K. N. Tu, Gery R. Stafford, Carlos R. Beauchamp, Inka Zienert, Holm Geisler, Petra Hofmann, Ehrenfried Zschech
Ultra-fine grained copper with a large amount of nano-scale twin boundaries has high mechanical strength and maintain normal electrical conductivity. The combination of these properties may lead to promising applications in future Si microelectronic

Directed Fabrication of Ceramic Nanostructures on Fragile Substrates Using Soft-Electron Beam Lithography (soft-eBL)

May 1, 2008
Author(s)
Suresh Donthu, Nasim Alem, Zixlao Pan, Shu-you Li, Gajendra Shekhawat, Vinayak Dravid, Kurt D. Benkstein, Stephen Semancik
We demonstrate the use of a facile nanopatterning scheme known as soft-electron beam lithography (soft-eBL) to fabricate and site-specifically position a variety of functional ceramic nanostructures onto fragile substrates: a 75-nm thick electron

Microstructure of oligofluorene asymmetric derivatives in organic thin film transistors

April 22, 2008
Author(s)
Quan Yuan, Stefan C. Mannsfeld, Ming L. Tang, Mark Roberts, Michael F. Toney, Dean DeLongchamp, Zhenan Bao
In organic thin film transistors (OTFT), modifying the molecular chemical structure affects the molecular packing and thin film morphology, which both sensitively influence the charge carrier mobility. A detailed understanding of the interplay of molecular

Self-Sealing Nanoporous Low-k Dielectric Patterns Created by Nanoimprint Lithography

April 15, 2008
Author(s)
Hyun Wook Ro, H Peng, Ken-ich Nihara, Hae-Jeong Lee, Eric K. Lin, Alamgir Karim, D Gidley, Hiropshi Jinai, Do Y. Yoon, Christopher L. Soles
In this letter we describe how highly porous nanostructures can be directly printed into a poly(methylsilsequioxane) (PMSQ)-based organosilicate film, with high pattern fidelity, and develop the measurement infrastructure to quantitatively evaluate the

Multiscale Modeling of Lattice Defects in Si-Ge(001) Quantum Wells

April 9, 2008
Author(s)
B. Yang, Vinod Tewary
A computationally efficient hybrid Green¿s function (GF) technique is developed for multiscale modeling of lattice defects in a trilayer material system that links seamlessly the length scales from lattice (sub-nanometers) to continuum (bulk). The model

Measuring the Modulus of Hydrated Contact Lenses via Surface Wrinkling

April 6, 2008
Author(s)
Jun Y. Chung, Young Jong Lee, Peyton Hopson, Michael J. Fasolka, Christopher Stafford
One of the most important considerations in the evaluation of hydrogels for biomedical and contact lens applications is the elastic modulus. The elastic modulus relates to several important factors including flexibility, comfort, adhesion, swelling

Quantifying Interfacial Adhesion in Transfer Printing via a Cantilever Peel Test

April 6, 2008
Author(s)
Jiong Liu, Jun Y. Chung, Christopher Stafford
Transfer printing has been demonstrated as a fabrication method for flexible organic electronics. The transfer printing process relies on the differential adhesion of a printable layer (PL) that is pressed between two substrates: transfer substrate (TS)

Synthesis and Characterization of Polymer Brushes from PDMS Surfaces

April 6, 2008
Author(s)
Heqing Huang, Adam J. Nolte, Jun Y. Chung, Christopher Stafford
In recent years, poly(dimethylsiloxane) (PDMS) has found increased application in the areas of microfluidic devices, chromatographic packing materials and membranes, as well as in medical and drug delivery devices. However, the hydrophobic surface of PDMS

X-Ray Imaging Optimization of 3D Tissue Engineering Scaffolds via Combinatorial Fabrication Methods

April 1, 2008
Author(s)
Yanyin Yang, Shauna M. Dorsey, Matthew Becker, Sheng Lin-Gibson, Gary E. Schumacher, Glenn M. Flaim, J Kohn, Carl G. Simon Jr.
We have developed a combinatorial method for determining optimum tissue scaffold composition for imaging by X-ray techniques. X-ray radiography and microcomputed tomography enable non-invasive imaging of implanted materials in vivo and in vitro

Characterizing Pattern Structures Using X-Ray Reflectivity

March 28, 2008
Author(s)
Hae-Jeong Lee, Christopher L. Soles, Hyun Wook Ro, Shuhui Kang, Eric K. Lin, Alamgir Karim, Wen-Li Wu
Specular X-ray reflectivity (SXR) can be used, in the limit of the effective medium approximation (EMA), as a high-resolution shape metrology for periodic patterns on a planar substrate. The EMA means that the density of the solid pattern and the space
Displaying 1301 - 1325 of 1926
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