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Displaying 1376 - 1400 of 1856

Effect of Self-Assembled Monolayer Film Order on Nanofriction

July 6, 2006
Author(s)
S Sambasivan, S Hsieh, Daniel A. Fischer, Stephen M. Hsu
Friction at the nanoscale has become a significant challenge for microsystems, including MEMS, NEMS and other devices. At nanoscale, lateral loading often causes component breakage and loss of functions in devices, therefore, accurate measurement and

Elastic Moduli of Ultrathin Amorphous Polymer Films

July 1, 2006
Author(s)
Christopher Stafford, C Harrison, D Julthongpiput, B D. Vogt
The elastic moduli of ultrathin poly(styrene) and poly(methylmethacrylate) films of thickness ranging from 200 nm to 5 nm were investigated using a buckling-based metrology. Below 40 nm, the apparent modulus of the PS and PMMA films decreases dramatically

NCMC Workshop ReportNCMC-9: Combinatorial Methods for Nanostructured Materials

July 1, 2006
Author(s)
Michael J. Fasolka, Carol E. Laumeier
NCMC-9: Combinatorial Methods for Nanostructured Materials was a forum to examine the application and development of nanostructured materials by industry, with a focus on polymeric products, such as films, coatings and paints, adhesives, and personal care

Correlating Molecular Design to Microstructure in Thermally Convertible Oligothiophenes: The Effect of Branched versus Linear End Groups

June 8, 2006
Author(s)
Dean M. DeLongchamp, Youngsuk Jung, Daniel A. Fischer, Eric K. Lin, P C. Chang, V Subramanian, A R. Murphy, J M. Frechet
The thin film microstructure development of functionalized oligothiophenes with branched, thermally removable groups at each end of conjugated cores with five, six, and seven thiophene rings was monitored during their thermal conversion from solution

Solution and Surface Composition Gradients via Microfluidic Confinement: Fabrication of a Statistical-Copolymer-Brush Composition Gradient

June 6, 2006
Author(s)
Chang Xu, Susan E. Barnes, Tao Wu, Daniel A. Fischer, Dean M. DeLongchamp, J Batteas, Kathryn L. Beers
A simple method to generate solution gradients through microfluidic confinement is described. The solution gradient inside a microchannel was formed by varying the relative infusion rates of two solutions that differed in compositions. The establishment

Wrinkling of Ultrathin Polymer Films

June 1, 2006
Author(s)
Rui Huang, Christopher Stafford, B D. Vogt
This paper presents a bilayer model to account for surface effects on the wrinkling of ultrathin polymer films. Assuming a surface layer of finite thickness, effects of surface properties on the critical strain, the equilibrium wavelength, and the wrinkle

Probing the Interfacial Adhesion Strength in Compositional Libraries of Epoxy Films

May 1, 2006
Author(s)
Christopher Stafford, J Y. Kim, D Kawaguchi, Gareth Royston, Martin Chiang
We are developing a measurement platform, based on the edge lift-off test geometry, geared towards combinatorial and high-throughput (C&HT) assessment of interfacial reliability in thermally cured epoxy materials. A critical parameter space to be explored

Measuring the Modulus of Soft Polymer Networks via a Buckling-Based Metrology

April 1, 2006
Author(s)
Elizabeth A. Wilder, Shu Guo, Sheng Lin-Gibson, Michael J. Fasolka, Christopher Stafford
We present a new method for measuring the modulus of soft polymer networks (E 10 MPa).This metrology utilizes compression-induced buckling of a sensor film applied to the surface of the specimen,where the periodic buckling wavelength, assessed rapidly by

One-Laser Interferometric Broadband Coherent Anti-Stokes Raman Scattering

March 30, 2006
Author(s)
T W. Kee, Hongxia (Jessica) Zhao, Marcus T. Cicerone
We introduce an interferometric technique for eliminating the nonresonant background of broadband coherent anti-Stokes Raman scattering (CARS) microscopy. CARS microscopy has been used for imaging a number of biological samples and processes, but the

Effects of Humidity on Unencapsulated Poly(thiophene) Thin Film Transistors

March 13, 2006
Author(s)
Michael L. Chabinyc, Fred Endicott, B D. Vogt, Dean DeLongchamp, Eric K. Lin, Yiliang Wu, Ping Liu, Beng S. Ong
The effects of humidity on unencapsulated polymeric thin-film transistors (TFTs) were investigated. TFTs were fabricated on glass substrates with inorganic gate dielectric and a semiconducting layer of poly[5,5 -bis(3-dodecyl-2-thienyl)-2,2 -bithiophene]

Cellular Response to Phase-Separated Blends of Tyrosine-Derived Polycarbonate

March 1, 2006
Author(s)
L A. Bailey, Matthew Becker, J S. Stephens, Nathan D. Gallant, Christine M. Mahoney, N Washburn, Aarti Rege, J Kohn, Eric J. Amis
Tyrosine-derived polycarbonates are extremely promising degradable materials for use in orthpedic applications and two-dimensional thin films consisting of homopolymer and discrete compositional blends of the ethyl (DTE) and octyl (DTO) ester polycarbonate

Fundamentals of the Reaction-Diffusion Process in Model EUV Photoresists

March 1, 2006
Author(s)
Kristopher Lavery, George Thompson, Hai Deng, D S. Fryer, Kwang-Woo Choi, B D. Vogt, Vivek Prabhu, Eric K. Lin, Wen-Li Wu, Sushil K. Satija, Michael Leeson, Heidi B. Cao
More demanding requirements are being made of photoresist materials for fabrication of nanostructures as the feature critical dimensions (CD) decrease. For EUV resists, control of line width roughness (LWR) and high resist sensitivity are key requirements

Estimation of the Interfacial Adhesion Strength in Compositional Libraries of Epoxy Films

February 22, 2006
Author(s)
Jae Hyun Kim, Martin Y. Chiang, D Kawaguchi, Gareth Royston, Christopher M. Stafford
At the NIST Combinatorial Methods Center (NCMC), we have designed, developed, and demonstrated a combinatorial approach to the edge delamination test to char-acterize the adhesion of thin polymer films. This test is based on fracture of a film/substrate
Displaying 1376 - 1400 of 1856