Rotational and translational diffusivities of germanium nanowires |
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Authors: | Bennett D Marshall Virginia A Davis Doh C Lee Brian A Korgel |
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Institution: | (1) Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA;(2) Department of Chemical Engineering, Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, TX 78712, USA |
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Abstract: | Understanding the rheological behavior of dilute dispersions of cylindrical nanomaterials in fluids is the first step towards
the development of rheological models for these materials. Individual particle tracking was used to quantify the rotational
and translational diffusivities of high-aspect-ratio germanium nanowires in alcohol solvents at room temperature. In spite
of their long lengths and high aspect ratios, the rods were found to undergo Brownian motion. This work represents the first
time that the effects of solvent viscosity and confinement have been directly measured and the results compared to proposed
theoretical models. Using viscosity as a single adjustable parameter in the Kirkwood model for Brownian rods was found to
be a facile and versatile way of predicting the diffusivities of nanowires across a broad range of length scales. |
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Keywords: | Brownian dynamics Tracking Suspension |
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