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Theiss Research

4 ARTICLES PUBLISHED IN JoVE

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Chemistry

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
Amanda L. Forster 1, Viviana Rodriguez Cardenas 1, Ajay Krishnamurthy 1,2, Zois Tsinas 3, Amy Engelbrecht-Wiggans 1,2, Nolan Gonzalez 1
1Material Measurement Laboratory, National Institute of Standards and Technology, 2Theiss Research, 3University of Maryland

The primary goal of the study is to develop a protocol to prepare consistent specimens for accurate mechanical testing of high strength copolymer aramid fibers, by removing a coating and disentangling the individual fiber strands without introducing significant chemical or physical degradation.

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JoVE Core

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
Amy Engelbrecht-Wiggans 1,2, Ajay Krishnamurthy 1,2, Faraz Burni 1,3, William Osborn 1, Amanda L. Forster 1
1Material Measurement Laboratory, National Institute of Standards and Technology, 2Theiss Research, 3Chemical and Biomolecular Engineering Department, University of Maryland

The goal of the study was to develop protocols to prepare consistent specimens for accurate mechanical testing of high-strength aramid or ultra-high-molar-mass polyethylene-based flexible unidirectional composite laminate materials and to describe protocols for performing artificial ageing on these materials.

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Engineering

Solution Blow Spinning of Polymeric Nano-Composite Fibers for Personal Protective Equipment
Zois Tsinas 1,2, Ran Tao 1,3, Amanda L. Forster 1
1Material Measurement Laboratory, National Institute of Standards and Technology, 2Theiss Research, 3Department of Chemical Engineering, Texas Tech University

The primary goal of this study is to describe a protocol to prepare polymeric fiber mats with consistent morphology via solution blow spinning (SBS). We aim to use SBS to develop novel, tunable, flexible polymeric fiber nanocomposites for various applications, including protective materials, by incorporating nanoparticles in a polymer-elastomer matrix.

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Chemistry

A Synthetic Methodology for Preparing Impregnated and Grafted Amine-Based Silica Composites for Carbon Capture
Charlotte M. Wentz 1,2, Zois Tsinas 1,3, Amanda L. Forster 1
1Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 2University of Maryland, 3Theiss Research

This work aims to facilitate the development of standardized techniques for impregnating or grafting aminated compounds onto silica substrates, which are often broadly described in the literature. Specific amounts of solvent, substrate, amines, and the values of other important experimental parameters will be discussed in detail.

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