Publications

Displaying 51 - 75 of 83

Influence of substrate on crystallization in polythiophene/fullerene blends

January 13, 2011

Author(s)

Lee J. Richter, Christine He, David Germack, R Joseph Kline, Dean DeLongchamp, Daniel A. Fischer, Chad R. Snyder, James G. Kushmerick

The nanoscale morphology of the active layer in organic, bulk heterojunction (BHJ) solar cells is crucial to device performance. Often a combination of casting conditions and post deposition thermal treatment are used to optimize the morphology. In general

Intercalation Pathways and Mechanical Properties of Epoxy Clay Hybrid Nanocomposites

September 28, 2010

Author(s)

Gale A. Holmes, Mickey Richardson, Jae Hyun Kim, Chad R. Snyder

Measuring the extent of phase separation in P3HT/PCBM photovoltaic blends with 1H spin diffusion NMR spectroscopy

April 5, 2010

Author(s)

Ryan C. Nieuwendaal, Chad R. Snyder, Regis J. Kline, Eric K. Lin, David L. VanderHart, Dean M. DeLongchamp

Nanoscale thermal mechanical probe determination of softening transitions in thin polymer films

November 19, 2008

Author(s)

Jing N. Zhou, Jack F. Douglas, Alamgir Karim, Chad R. Snyder, Christopher Soles, Brian Berry

We report a quantitative study of softening behavior of glassy polystyrene (PS) films at the 100 nm length scales using nano-thermomechanometry (nano-TM), an emerging scanning probe technique where a highly-doped silicon AFM tip is resistively heated on

Morphological Changes in Thin Polypropylene Films Induced by 4-Biphenyl Carboxylic Acid

October 16, 2008

Author(s)

Marlon L. Walker, Chad R. Snyder, Naomi Eidelman, E S. Etz, A P. Smith, Alamgir Karim, Eric J. Amis

The crystallization behavior of thin polypropylene films both neat and containing a nucleating agent, 4-biphenyl carboxylic acid, was investigated by optical microscopy, atomic force microscopy, infrared spectroscopy and Raman spectroscopy. High-throughput

A Methodology for Detecting Interfacial Debonding in Clay/Epoxy Nanocomposites

July 1, 2006

Author(s)

Jae Hyun Kim, Gale A. Holmes, Chad R. Snyder

Ballistic Fibers: A Review of the Thermal, Ultraviolet, and Hydrolytic Stability of the Benzoxazole Ring Structure

April 10, 2006

Author(s)

Gale A. Holmes, Kirk D. Rice, Chad R. Snyder

Polymers Division FY 2005 Programs and Accomplishments

March 1, 2006

Author(s)

Eric J. Amis, Chad R. Snyder

No Abstract Included.

Quantifying the Directional Parameter of Structural Anisotropy in Porous Media

January 1, 2006

Author(s)

Martin Y. Chiang, Xianfeng Wang, Forrest A. Landis, Joy P. Dunkers, Chad R. Snyder

Dielectric Properties of Nylon 6/Clay Nanocomposites From On-Line Process Monitoring and Off-Line Measurements

July 1, 2005

Author(s)

N Noda, Y E. Lee, Anthony J. Bur, Vivek Prabhu, Chad R. Snyder, S C. Roth, M M. McBrearty

Nylon 6/ clay nanocomposites were studied by dielectric relaxation spectroscopy (DRS) to correlate morphology and microstructure with relaxation behavior of the polymer matrix at the molecular level. Two types of microstructure, agglomerated and exfoliated

Polymers Division FY 2004 Programs and Accomplishments

September 1, 2004

Author(s)

Eric J. Amis, Chad R. Snyder

The programs and accomplishments of the NIST Polymers Division for the fiscal year 2004 are described.

Monte-Carlo Simulator for the Failure Process and Energy Release Rate of Unidirectional CFRP a Different Temperatures

April 1, 2004

Author(s)

Xianfeng Wang, Martin Y. Chiang, Chad R. Snyder

This paper presents an analytical approach that combines the modified shear-lag model and the Monte-Carlo simulation technique to simulate the fracture behavior, including the failure process and energy release rate, for unidirectional fiber-reinforced

A Simple Methodology for Observing Mechanical Properties of Nanocomposites. Part 2: Investigation of Interfacial Properties in E-Glass Fiber Model Composites

February 20, 2004

Author(s)

Jae Hyun Kim, Gale A. Holmes, Chad R. Snyder

The fiber/matrix interfacial shear strength (IFSS) and the fiber/matrix interphase fracture toughness are critical parameters that control failure initiation and crack propagation in composites. In spite of this importance, most IFSS test methods ignore

Monte-Carlo Simulation for the Fracture Process And Energy Release Rate of Unidirectional Carbon Fiber-Reinforced Polymers at Different Temperatures

January 1, 2004

Author(s)

X Wang, Martin Chiang, Chad R. Snyder

MSEL FY 2003 Programs and Accomplishments: Polymers Division

September 1, 2003

Author(s)

Eric J. Amis, Chad R. Snyder

The programs and accomplishments of the NIST Polymers Division for the Fiscal year 2003 are described.

Proton NMR Characterization of Room-Temperature Aging After Modest Thermal Cycling in Isotactic Polypropylenes

July 1, 2003

Author(s)

David L. VanderHart, Chad R. Snyder

An proton NMR method, based on simple Bloch-decay spectra in the solid state, is presented that enables one to follow, with excellent sensitivity, structural changes associated with aging in semicrystalline polymers whose Tg is well below the aging

Proton NMR Characterization of Room-Temperature Aging in Isotactic Polypropylene and Ethylene/Octene Copolymers

January 1, 2003

Author(s)

David L. VanderHart, Chad R. Snyder, R G. Alamo

In this paper, we utilize the relatively high sensitivity of proton NMR to revisit a well recognized problem of ambient-temperature aging in a couple of semicrystalline polymers, isotactic polypropylene (iPP) and 2 ethylene/octene (EO) copolymers, all of

Polymers Division Materials Science and Engineering Laboratory FY 2002 Programs and Accomplishments

September 1, 2002

Author(s)

Eric J. Amis, B M. Fanconi, Chad R. Snyder

The advent of controlled polymerization, advanced electronics, biomimetic materials, nanostructured systems, and a range of other new avenues for polymeric materials has raised the bar for measurements and standards research. This report of the 2002

Survey of FY 2001 Nanotechnology-Related Research at the National Institute of Standards and Technology

February 1, 2002

Author(s)

Chad R. Snyder, J P. Looney, F A. Moris

This report catalogs the efforts of the National Institute of Standards and Technology (NIST) in nanotechnology during FY 2001. The purpose of this report is to provide a snapshot of current efforts in nanotechnology at NIST and in doing so allow one to

Survey of FY 2001 Nanotechnology-Related Research at the National Institute of Standards and Technology.

January 1, 2002

Author(s)

Chad R. Snyder, J P. Looney, M P. Casassa

NIST Recommended Practice Guide: Capacitance Cell Measurement of the Out-of-Plane Expansion of Thin Films

November 1, 2001

Author(s)

Chad R. Snyder, F I. Mopsik

The coefficient of thermal expansion (CTE) continues to be a critical parameter in modeling for the microelectronics industry. Over the past several years, NIST has worked to develop a robust and highly accurate means for determined the CTE of polymer

A Precision Capacitance Cell for Measurement of Thin Film Out-of-Plane Expansion Part III. Conducting and Semiconducting Materials

October 1, 2001

Author(s)

Chad R. Snyder, F I. Mopsik

This paper describes the construction, calibration, and use of a precision capacitance-based metrology for the measurement of the thermal and hygrothermal (swelling) expansion of thin films. It is demonstrated that with this version of our capacitance cell

High Sensitivity Technique for Measurement of Thin Film Out-of-Plane Expansion. II. Conducting and Semiconducting Samples

January 1, 2001

Author(s)

Chad R. Snyder

Determination of the Dielectric Constant of Nanoparticles. I. Dielectric Measurements of Buckminsterfullerene Solutions

November 1, 2000

Author(s)

Chad R. Snyder, Jack F. Douglas

The static dielectric constant ε of buckminsterfullerene C 60 particles is determined in cis-decalin, toluene, and 1,2-dichlorobenzene using continuum models for spherical and sherical shell inclusions. The value for ε for isolated C 60 in cis-decalin and

Determination of the Dielectric Constant of Nanoparticles. 1. Dielectric Measurements of Buckminsterfullerene Solutions

January 1, 2000

Author(s)

Chad R. Snyder, Jack F. Douglas

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