A strain-controlled RheoSANS instrument for the measurement of the microstructural, electrical, and mechanical properties of soft materials

In situ measurements are an increasingly important tool to inform the complex relationship between nanoscale properties and macroscopic material measurements. Knowledge of these phenomena can be used to develop new materials to meet the performance demands of next generation technologies. Conductive...

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Bibliographic Details
Published in:Review of scientific instruments 2017-10, Vol.88 (10), p.105115-105115
Main Authors: Richards, Jeffrey J., Wagner, Norman J., Butler, Paul D.
Format: Article
Language:English
Subjects:
Ammonium nitrate
Control equipment
Design parameters
Dielectric properties
Electrical resistivity
Forced convection
Hexadecane
Impedance spectroscopy
In situ measurement
Ionic liquids
Mechanical properties
Microstructure
Neutron scattering
Rheological properties
Rheology
Scientific apparatus & instruments
Spectroscopic analysis
Spectrum analysis
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Summary:In situ measurements are an increasingly important tool to inform the complex relationship between nanoscale properties and macroscopic material measurements. Knowledge of these phenomena can be used to develop new materials to meet the performance demands of next generation technologies. Conductive complex fluids have emerged as an area of research where the electrical and mechanical properties are key design parameters. To study the relationship between microstructure, conductivity, and rheology, we have developed a small angle neutron scattering (SANS) compatible Couette rheological geometry capable of making impedance spectroscopy measurements under continuous shear. We have also mounted this geometry on a commercial strain controlled rheometer with a modified forced convection oven. In this manuscript, we introduce the simultaneous measurement of impedance spectroscopy, rheological properties and SANS data. We describe the validation of this dielectric RheoSANS instrument and demonstrate its operation using two systems—an ion gel comprising Pluronic® surfactant and ionic liquid, ethyl-ammonium nitrate, and poly(3-hexylthiophene) organogel prepared in a mixture of hexadecane and dichlorobenzene. In both systems, we use this new measurement capability to study the microstructural state of these materials under two different protocols. By monitoring their dielectric rheology at the same time as the SANS measurement, we demonstrate the capacity to directly probe structure-property relationships inherent to the macroscopic material response.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4986770