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

Christian Lang; Jan Hendricks; Zhenkun Zhang; Naveen K. Reddy; Jonathan P. Rothstein; M. Paul Lettinga; Jan Vermant; Christian Clasen

doi:10.1039/C8SM01925H

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

Christian Lang,

‡*^a Jan Hendricks,

^b Zhenkun Zhang,

^c Naveen K. Reddy,^de Jonathan P. Rothstein,^f M. Paul Lettinga,

‡^a Jan Vermant

^g and Christian Clasen

^b

Author affiliations

* Corresponding authors

^a Institute of Complex Systems-3, Forschungszentrum Jülich, 52428 Jülich, Germany
E-mail: c.lang@fz-juelich.de
Tel: +49 2461 61 2149

^b Department of Chemical Engineering, KU Leuven, B-3001 Leuven, Belgium

^c Key Laboratory of Functional Polymer Materials, Ministry of Education and Institute of Polymer Chemistry, Nankai University, Tianjin, P. R. China

^d Faculty of Industrial Engineering, Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium

^e IMO, IMOMEC, Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium

^f Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA, USA

^g Department of Materials, ETH Zürich, 8093 Zürich, Switzerland

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.

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

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