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Search Publications by: Christopher Stafford (Fed)

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Displaying 326 - 350 of 394

Wetting Behavior on Microscale Wrinkled Surfaces

January 1, 2007
Author(s)
Jun Y. Chung, Christopher M. Stafford
We present a systematic study of the wetting behavior on the anisotropic microstructure having a simple sinusoidal profile. The micro-patterned surface was generated by using the buckling-based technique, and its wetting properties were examined by contact

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

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

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

Generating Thickness Gradients of Thin Polymer Films via Flow Coating

February 1, 2006
Author(s)
Christopher Stafford, Kristen Roskov, Thomas Epps, Michael J. Fasolka
Thickness is a governing factor in the behavior of films and coatings. To enable the high-throughputanalysis of this parameter in polymer systems, we detail the design and operation of a flow coater device for fabricating continuous libraries of polymer

Combinatorial and High-Throughput Measurement of the Modulus of Thin Polymer Films

June 1, 2005
Author(s)
Christopher M. Stafford, Shu Guo, Martin Y. Chiang, C Harrison
Considerable attention has been devoted to developing fabrication strategies for constructing combinatorial material libraries as well as tools for characterizing the chemical and physical properties of such libraries. Less attention has been dedicated to

Application of Combinatorial Methods for the Testing of Adhesives

April 10, 2005
Author(s)
Christopher M. Stafford
This presentation will focus on the development and application of novel high-throughput platforms for both adhesion and mechanical property testing. For screening of commercial pressure sensitive adhesives, we are applying C&HT tools to conventional peel

The Development of a High-Throughput Axisymmetric Adhesion Test

February 13, 2005
Author(s)
Aaron M. Forster, Wenhua Zhang, Christopher Stafford
There has been a growing effort to extend combinatorial and high throughput (C&HT) methods into many aspects of material science, including material property screening and materials discovery. In material science, a prevalent approach to combinatorial