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Displaying records 191 to 200 of 233 records.
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191. Solvent Retention In Thin Spin-Coated Polystyrene And Poly(Methyl Methacrylate) Homopolymer Films Studied By Neutron Reflectometry
Published: 1/19/2010
Authors: Xiaohua Zhang, Kevin G. Yager, Shuhui Kang, Nathaniel J Fredin, Bulent Akgun, Sushil K Satija, Jack F Douglas, Alamgir Karim, Ronald Leland Jones
Abstract: We utilize neutron reflectometry (NR) to probe the amount of residual solvent inside thin polystyrene (PS) and poly(methyl methacrylate) (PMMA) films spin-coated from deuterated toluene polymer solutions onto silicon substrates . The effect of therma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903220

192. Spinodal Dewetting of Thin Polymer Films
Published: 8/1/1998
Authors: R H Xie, Alamgir Karim, Jack F Douglas, Charles C. Dr. Han, Robert A Weiss
Abstract: Dewetting of polystyrene (PS) films on a silicon substrate is investigated as a function of film thickness, h. We observe the nucleation of holes in the early stage of dewetting for relatively thick films (h > 100 {Angstrom}), as observed previously, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852828

193. Spinodal Dewetting on Chemically Patterned Substrates
Published: Date unknown
Authors: A Sehgal, V Ferreiro, Jack F Douglas, Eric J. Amis, Alamgir Karim
Abstract: We utilize chemically patterned substrates with arrays of progressively narrower stripes (1-15 mm) to investigate the influence of pattern size on the morphology of dewetting polystyrene films. The early-stage dewetting patterns align with the substr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851885

194. Structural Signatures of Varification in Hard Core Fluids
Published: 9/1/2003
Authors: S K Kumar, Jack F Douglas, Francis W. ~undefined~undefined~undefined~undefined~undefined Starr, S Garde
Abstract: We investigate the capacities of local measures of free volume in liquids to predict basic aspects of the fluids state- the formation of a liquid from a gas, complex 'caged' fluid dynamics and vitrification. Specifically, we investigate the capacity ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852217

195. Structural and Dynamic Heterogeneity in a Telechelic Polymer Solution
Published: 5/1/2004
Authors: D Bedrov, G D Smith, Jack F Douglas
Abstract: We utilize molecular dynamics simulations to investigate the implications of micelle formation on structural relaxation and polymer bead displacement dynamics in a model telechelic polymer solution. The transient structural heterogeneity associated w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852267

196. Structured Polymeric Templates: Combinatorial Probes for Cellular Response
Published: 1/1/2001
Authors: A Sehgal, Jack F Douglas, Francis W Wang, Carl George Simon Jr., Alamgir Karim, Eric J. Amis
Abstract: Novel high-throughput gradient methods have been developed to generate a range of surface structures by dewetting and phase separation on chemically patterned substrates. The research is motivated by an increasing awareness in the biomedical industry ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851841

197. Studies of polymer-filler interactions in filled systems
Published: 8/1/2001
Authors: Alamgir Karim, Jack F Douglas, K A Barnes, A Nakatani, D W. Liu, Eric J. Amis
Abstract: We observe that the presence of filler partiocles can have a major impact on the properties of filled polymer blend materials. The filler particles, which are found in many commercial polymer blends, modify the phase boundary (interfacial tension, ra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851903

198. Suppression of Dewetting in Nanoparticle-Filled Polymer Films
Published: 1/1/2000
Authors: K A Barnes, Alamgir Karim, Jack F Douglas, A Nakatani, H Gruell, Eric J. Amis
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853660

199. Suppression of Phase Separation Pattern Formation in Blend Films With Block Copolymer Compatibilizer
Published: 7/1/2003
Authors: Li Piin Sung, Jack F Douglas, Charles C. Dr. Han, Alamgir Karim
Abstract: We show that the addition of a small concentration of a block copolymer surfactant to a thin phase separating blend film can suppress the pattern formation that occurs in the blend films without block copolymer. This effect is observed even at very ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852060

200. Suppression of Surface Pattern Formation in Blend Films With Block Copolymer Surfactant
Published: 7/1/2003
Authors: Li Piin Sung, Jack F Douglas, Charles C. Dr. Han, Alamgir Karim
Abstract: We show that the addition of a small concentration of a block copolymer surfactant to a thin phase separating blend film can supppress the pattern formation that occurs in the blend films without block copolymer. This effect is obseved even at very ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851867



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