Multi-Sample Rheometer for Formulation Science
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Introduction
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Motivation
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Many formulation and nanotechnology requirements for polymeric
materials include well-defined molecular characteristics (molar
mass, composition, architecture, etc.)
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Objective
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| To measure the rheology of polymer formulations combinatorially |
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Goal: To demonstrate that polymer synthesis and characterization
can be integral parts of the factory on a chip.
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Experimental Approach
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Top
view of Couette Cell Array
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The LED indicates the current
sign and zero crossing, giving the phase lag between the
current signal and rotor response.
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Results
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| Aqueous 2% Poly(ethylene oxide) solutions: points are combi-rheometer
data and lines are data from “traditional” commercial
rheometer
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| Polystyrene in Dioctyl Phthalate: simultaneous measurement
of four samples |
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Wormy micelle rheology: Sodium Salicylate (Na Sal) and Cetylpyridinium
Chloride (CPyCl):
Effect of surfactant concentration: 50.1 mM NaSal + x mM CPyCl
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Publications
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Multi-Sample Couette Viscometer for Polymer Formulations,”
Howard J. Walls,
Robert F. Berg & Eric J. Amis, Measurement Science and Technology,
in Press (2004) |
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Current Work*
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| Performing measurements of complex fluid rheology in a microfluidic
device using magnetic sphere micro-rheometry
Measurements will eventually be made high-throughput
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| *Work being performed by Jai A. Pathak |
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NIST Contributors:
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| Howard J. Walls, Robert F. Berg, Jai A. Pathak, Kathryn L.
Beers and Eric J. Amis
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