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    Instrument for measurement of interfacial structure-property relationships with decoupled interfacial shear and dilatational flow: Quadrotrough

    Year: 2022

    Journal: Rev. Sci. Instrum., Volume 93, SEP 1

    Authors: Tein, Y. Summer; Thompson, Benjamin R.; Majkrzak, Chuck; Maranville, Brian; Renggli, Damian; Vermant, Jan; Wagner, Norman J.

    Organizations: NIST, U.S. Department of Commerce [370NANB17H302]; National Institute of Standards and Technology, U.S. Department of Commerce; National Science Foundation [DMR-0944772]; Swiss National Science Foundation [200021-165974]

    Understanding the interfacial structure-property relationship of complex fluid-fluid interfaces is increasingly important for guiding the formulation of systems with targeted interfacial properties, such as those found in multiphase complex fluids, biological systems, biopharmaceuticals formulations, and many consumer products. Mixed interfacial flow fields, typical of classical Langmuir trough experiments, introduce a complex interfacial flow history that complicates the study of interfacial properties of complex fluid interfaces. In this article, we describe the design, implementation, and validation of a new instrument capable of independent application of controlled interfacial dilation and shear kinematics on fluid interfaces. Combining the Quadrotrough with both in situ Brewster angle microscopy and neutron reflectometry provides detailed structural measurements of the interface at the mesoscale and nanoscale in relationship to interfacial material properties under controlled interfacial deformation histories. (c) 2022 Author(s).
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