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Search Publications

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Displaying 1126 - 1150 of 1856

Interfacial Rheology in Complex Flow

August 23, 2009
Author(s)
Jeffrey D. Martin, Steven Hudson
Typical methods used to measure dynamic interfacial properties of multiphase liquid systems often employ drops that are much larger and flows that are much simpler than those encountered in typical processing applications. A microfluidic approach is used

Adhesion and Mechanics of Complex Polymer Interfaces

August 16, 2009
Author(s)
Christopher M. Stafford, Jun Y. Chung, Heqing Huang, Adam J. Nolte, Peter M. Johnson, Edwin P. Chan
The structure and properties of polymer interfaces play an integral role in numerous technological applications, particularly in the areas of coatings and adhesives. These interfacial interactions are dependent on a host of factors, including interfacial

The Effect of Environmental and Mechanical Mechanisms on the Performance of Soft Body Armor

July 27, 2009
Author(s)
Gale A. Holmes, Eun S. Park, Jae Hyun Kim, Walter G. McDonough, John R. Sieber, Haruki Kobayashi, Michael A. Riley, Kirk D. Rice
The use of high performance fibers (such as, poly[(benzo-[1,2-d;5,4-d ]-benzoxazole-2,6-diyl)-1,4-phenylene]1 (PBO), ultra-high molecular weight polyethylene2 (UHMWPE), and poly(p-phenylene terephthalamide)3 (PPTA)) in soft body armor (SBA) is well

Moisture Attack on Adhesive Joints: Roles of Adhesive and Interface Properties

July 22, 2009
Author(s)
Donald L. Hunston, Kar T. Tan, Sushil K. Satija, Christopher C. White, Bryan D. Vogt, Cyril Clerici
It is well-known that moisture will attack many adhesive joints. A particularly interesting feature is the observation that when the moisture level in certain systems exceeds a critical concentration, the bonded joint shows a dramatic loss of strength. A

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
Displaying 1126 - 1150 of 1856