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Effects of particle stiffness on the extensional rheology of model rod-like nanoparticle suspensions

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Abstract

The linear and nonlinear rheological behavior of two rod-like particle suspensions as a function of concentration is studied using small amplitude oscillatory shear, steady shear and capillary breakup extensional rheometry. The rod-like suspensions are composed of fd virus and its mutant fdY21M, which are perfectly monodisperse, with a length on the order of 900 nm. The particles are semiflexible yet differ in their persistence length. The effect of stiffness on the rheological behavior in both, shear and extensional flow, is investigated experimentally. The linear viscoelastic shear data is compared in detail with theoretical predictions for worm-like chains. The extensional properties are compared to Batchelor's theory, generalized for the shear thinning nature of the suspensions. Theoretical predictions agree well with the measured complex moduli at low concentrations as well as the nonlinear shear and elongational viscosities at high flow rates. The results in this work provide guidelines for enhancing the elongational viscosity based on purely frictional effects in the absence of strong normal forces which are characteristic for high molecular weight polymers.

Graphical abstract: Effects of particle stiffness on the extensional rheology of model rod-like nanoparticle suspensions

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Publication details

The article was received on 20 Sep 2018, accepted on 03 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01925H
Citation: Soft Matter, 2019, Advance Article
  • Open access: Creative Commons BY license
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    Effects of particle stiffness on the extensional rheology of model rod-like nanoparticle suspensions

    C. Lang, J. Hendricks, Z. Zhang, N. K. Reddy, J. P. Rothstein, M. P. Lettinga, J. Vermant and C. Clasen, Soft Matter, 2019, Advance Article , DOI: 10.1039/C8SM01925H

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