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Displaying 1426 - 1450 of 1923

Evidence for Internal Stresses Induced by Nanoimprint Lithography

November 30, 2006
Author(s)
Hyun Wook Ro, Yifu Ding, Hae-Jeong Lee, Daniel R. Hines, Ronald L. Jones, Eric K. Lin, Alamgir Karim, Wen-Li Wu, Christopher L. Soles
The thermal embossing form of nanoimprint lithography is used to pattern arrays of nanostructures into several different polymer films. The shape of the imprinted patterns is characterized with nm precision using both X-ray scattering and reflectivity

Drying Induced Variations in Physico-Chemical Properties of Amorphous Pharmaceuticals and Their Impact on Stability (I): Stability of aMonoclonal Antibody

November 21, 2006
Author(s)
Ahmad Abdul-Fattah, Vu Truong-Le, Luisa Yee, Lauren Nguyen, Devendra Kalonia, Marcus T. Cicerone, Michael Pikal
Both drying method and formulation had a significant impact on the properties of IgG1 powders, including storage stability. Among the drying methods, SSA was highest and perturbations in secondary structure were lowest with the spray dried preparations

The Effect of Deprotection Extent on Swelling and Dissolution Regimes of Thin Polymer Films

October 28, 2006
Author(s)
Ashwin Rao, Shuhui Kang, B D. Vogt, Vivek M. Prabhu, Eric K. Lin, Wen-Li Wu, M Muthukumar
The response of unentangled polymer thin films to aqueous hydroxide solutions is measured as a function of increasing weakly-acidic methacrylic acid comonomer content produced by an in-situ reaction-diffusion process. Quartz crystal microbalance with

Comparative Measures of Single Wall Carbon Nanotube Dispersion

September 14, 2006
Author(s)
Jeffrey A. Fagan, Brian Landi, Idan Mandelbaum, Vardhan Bajpai, Barry J. Bauer, Kalman D. Migler, Jeffrey R. Simpson, Angela R. Hight Walker, Ryan Raffaelle, Erik K. Hobbie
Model polymer composites of DNA wrapped single-wall carbon nanotubes (SWNTs) dispersed in polyacrylic acid are used for a systematic comparison of the different metrologies currently used to evaluate SWNT dispersion. Application of a pH-controlled

Development of NIST SRM 2881, an Absolute Molecular Mass Distribution Polymer Standard

September 1, 2006
Author(s)
William E. Wallace, Charles M. Guttman, Kathleen M. Flynn, Anthony J. Kearsley
We present a strategy to create an absolute molecular mass distribution polymer Standard Reference Material. To create a standard our methods must be free of operator bias (intentional or unintentional). The steps include sample preparation, instrument

Raman Spectroscopic Monitoring of Droplet Polymerization in a Microfluidic Device

September 1, 2006
Author(s)
Susan E. Barnes, Zuzanna T. Cygan, Kathryn Beers, Eric J. Amis, Jesse K. Yates
Thiolene based microfluidic devices were used to generate droplets of benzyl methacrylate monomer and hexanediol dimethacrylate crosslinker mixtures suspended in a water/surfactant continuous phase. A gradient of droplet composition was established and the

The Glass Transition of Miscible Binary Polymer-Polymer Thin Films

August 4, 2006
Author(s)
Brian M. Bescancon, Christopher Soles, P A. Green
The average glass transition temperatures, Tg, of thin homopolymer films exhibit a thickness dependence, Tg(h), determined by a confinement effect and by the polymer segment/interface interactions. The Tgs of completely miscible thin film blends of

Electrochemical Study of Chitosan Films Deposited on Gold Electrodes

July 28, 2006
Author(s)
Rebecca A. Zangmeister, J J. Park, G W. Rubloff, Michael J. Tarlov
We report the electrochemical characterization of chitosan films deposited on gold electrodes. Cyclic voltammetry was used to characterize the deposition and electroactivity of chitosan coated gold electrodes. Chitosan films were found to deposit at a gold

Influence of Confinement on the Fragility of Antiplasticized and Pure Polymer Films

July 27, 2006
Author(s)
Robert A. Riggleman, K Yoshimoto, Jack F. Douglas, J J. de Pablo
We investigate by molecular dynamics simulation how thin film confinementmodifies the fragility of a model glass-forming liquid characterized previously in the bulk. Film confinement is found to reduce the relative fragility of the polymer fluid, leading

Real Time Shape Evolution of Nanoimprinted Polymer Structures During Thermal Annealing

July 18, 2006
Author(s)
Ronald L. Jones, T Hu, Christopher L. Soles, Eric K. Lin, R M. Reano, Stella W. Pang, D M. Casa
The real time shape of nanoimprinted polymer patterns are measured as a function of annealing temperature and time using a new metrology technique, Critical Dimension Small Angle X-ray Scattering (CD-SAXS). Periodicity, linewidth, line height, and sidewall

Mapping substrate/film adhesion with contact-resonance-frequency AFM

July 12, 2006
Author(s)
Donna C. Hurley, Malgorzata Kopycinska-Mueller, Eric Langlois, Tony B. Kos, Nicholas Barbosa
We demonstrate contact-resonance-frequency atomic force microscopy (AFM) techniques to nondestructively image variations in adhesion at a substrate/film interface. Contact-resonance-frequency imaging is a dynamic AFM technique to measure the contact

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
Displaying 1426 - 1450 of 1923
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