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Displaying 1226 - 1250 of 1944

Microscale Polymer-Nanotube Composites

July 2, 2009
Author(s)
Erik K. Hobbie, Jeffrey A. Fagan, Jan Obrzut, Steven D. Hudson
Microscopic polymer colloids with an interfacial coating of purified single-wall carbon nanotubes (SWCNTs) have been synthesized from length and type sorted SWCNTs. Aqueous SWNCT suspensions sorted through density-gradient ultracentrifugation are used to

Depressed Phase Transition in Solution-Grown VO2 Nanostructures

July 1, 2009
Author(s)
Daniel A. Fischer, Luisa Whittaker, Cherno Jaye, Zugen Fu, Sarbajit Banerjee
The first-order metal insulator phase transition in VO2 is characterized by an ultrafast several orders of magnitude change in electrical conductivity and optical transmittance, which makes this material an attractive candidate for the fabrication of

Microfluidic Mixer for Polymer Melts

June 22, 2009
Author(s)
Doyoung Moon, Kalman D. Migler
We present a novel microfluidic mixer for high temperature polymer melts based on the platform of the Multi-sample Micro-slit Rheometer (MMR). The device is essentially a static mixer with eight consecutive units of splitting and recombination flow formed

Predicting Material In-Service Performance using the NIST SPHERE

June 17, 2009
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan
Selecting a polymeric material for an application exposed to outdoor weathering is a challenging task. The proper selection requires knowledge of the behavior of the material, which is a complex mixture involving the integration of rheology, reliability

Capillary Instability in Nanoimprinted Polymer Films

May 21, 2009
Author(s)
Kyle J. Alvine, Yifu Ding, Hyun Wook Ro, Brian C. Okerberg, Alamgir Karim, Christopher L. Soles, Jack F. Douglas
Capillary forces play an active role in defining the equilibrium structure of nanoscale structures. This effect can be especially pronounced in soft materials such as polymers near or above their glass transition temperatures where material flow is

Large Random Telegraph Noise in Sub-Threshold Operation of Nano-Scale nMOSFETs

May 18, 2009
Author(s)
Jason P. Campbell, Liangchun (. Yu, Kin P. Cheung, Jin Qin, John S. Suehle, A Oates, Kuang Sheng
We utilize low-frequency noise measurements to examine the sub-threshold voltage (sub-VTH) operation of highly scaled devices. We find that the sub-VTH low-frequency noise is dominated by random telegraph noise (RTN). The RTN is exacerbated both by channel

The Negative Bias Temperature Instability vs. High-Field Stress Paradigm

May 18, 2009
Author(s)
Jason P. Campbell, Kin P. Cheung, John S. Suehle, A Oates
A new and more accurate fast-IDVG measurement methodology is utilized to examine the transient degradation and recovery associated with the negative-bias temperature instability (NBTI). The results reveal that the anomalously large initial degradations

Modification of PET surfaces with self-assembled monolayers of organosilane precursors

May 13, 2009
Author(s)
Daniel A. Fischer, Ali Ozcam, Kirill Effimenko, Cherno Jaye, Richard Spontak, Jan Genzer
We report on a facile, robust and rapid method by which poly(ethylene terephthalate) (PET) surfaces can be chemically modified while avoiding chemical degradation. Specifically, we demonstrate that brief exposure of PET surfaces to ultraviolet/ozone (UVO)

The Origin of Critical Relative Humidity in Adhesion

May 11, 2009
Author(s)
Christopher C. White, Kar T. Tan, Bryan D. Vogt, Donald L. Hunston
Water is ubiquitous in the atmosphere. Unfortunately, adhesive bonding is susceptible to the environmental attack of water leading to significant depreciation in joint strength and subsequently to premature failures [1-6]. This susceptibility of bonding to

Quantitative Measurement of the Polydispersity in the Extent of Functionalization of Glass Forming Resorcinarenes

May 1, 2009
Author(s)
William E. Wallace, Kathleen M. Flynn, Charles M. Guttman, David L. VanderHart, Vivek M. Prabhu, Anuja De Silva, Nelson Felix, Christopher K. Ober
The polydispersity in the degree of functionalization for two calix[4]resorcinarenes was determined by measuring their molecular mass distribution with matrix-assisted laser desorption/ionization time of flight mass spectrometry. A mathematical method for

In-plane bias in a patterned ferromagnetic/antiferromagnetic bilayer

April 30, 2009
Author(s)
Yury P. Kabanov, Valerian I. Nikitenko, Oleg A. Tikhomirov, William F. Egelhoff Jr., Alexander J. Shapiro, Robert D. Shull
Exchange bias in bi- and multilayer magnetic systems is usually ascribed to the existence of transient magnetic structures at the interfaces between adjacent layers. Here, we report the observation of a similar phenomenon in the lateral direction

Random Telegraph Noise in Highly Scaled nMOSFETs

April 26, 2009
Author(s)
Jason P. Campbell, Jin Qin, Kin P. Cheung, Liangchun (. Yu, John S. Suehle, A Oates, Kuang Sheng
Recently 1/f and random telegraph noise (RTN) studies have been used to infer information about bulk dielectric defects' spatial and energetic distributions. These analyses rely on a noise framework which involves charge exchange between the inversion

Robust, conductive ordered mesoporous films based on carbon-silica composites

April 22, 2009
Author(s)
Lingyan Song, Dan Feng, Casey G. Campbell, Aaron M. Forster, Dongyuan Zhao, Bryan D. Vogt
Mesoporous carbon-based sensors have been demonstrated to have enhanced electrochemical response as a result of their large interfacial area. To date, mesoporous carbon powders held together by a polymeric binder have been typically utilized. However for

Impact of polymer modulus on water accumulation at polymer / metal oxide interfaces

April 1, 2009
Author(s)
Alper Karul, Kar T. Tan, Christopher C. White, Donald L. Hunston, Steve marshall, Bulent Akgun, Sushil K. Satija, Christopher Soles, Bryan D. Vogt
Ambient moisture is known to accumulate at the interface between polymers and metal oxides, leading to detrimental consequences on physical properties such as modulus and adhesion. Direct measurement of the interfacial profile has utilized neutron

Elastic and adhesive properties of alkanethiol self-assembled monolayers on gold

March 30, 2009
Author(s)
Frank W. DelRio, Cherno Jaye, Daniel A. Fischer, Robert F. Cook
Elastic and adhesive properties of alkanethiol (CH3(CH2)n 1SH) self-assembled monolayers on gold are investigated by atomic force microscopy and correlated with surface structure via near edge x-ray absorption fine structure spectroscopy. As the chain

Test Chip to Evaluate Measurement Methods for Small Capacitances

March 30, 2009
Author(s)
Joseph J. Kopanski, Muhammad Y. Afridi, Chong Jiang, Curt A. Richter
We designed and fabricated a test chip to help us evaluate the performance of new approaches to measurement of small capacitances (femto-Farads to atto-Farads range). The test chip consists of an array of metal-oxide-semiconductor capacitors, metal
Displaying 1226 - 1250 of 1944
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