Aggregated suspensions of rodlike particles are commonly encountered in soft biological materials and their solidlike response at extremely low volume fractions is also exploited technologically. Understanding the link between the physicochemical parameters such as size, aspect ratio, volume fraction, and interparticle forces with the resulting microstructure and the subsequent rheological response remains challenging. In the present work, suspensions of monodisperse rodlike virus particles, whose surface is modified by grafting with a thermoreversible polymer poly(N-isopropylacrylamide), are used as a model system. The repulsive and attractive contributions to the total interaction potential can be changed independently by varying the ionic strength and the temperature. The effects of these changes on the strength and structure of gels have been studied near the gel transition using a combination of rheological and scattering measurements. Rheological measurements of the near critical gel properties as a function of concentration and ionic strength proved to be more sensitive compared to scattering in resolving the structural differences. A percolating structure can be formed at very low volume fractions, which show a weak dependence on the ionic strength with the anisotropy of the repulsive interactions playing the main role in creating more “open” structures. The intrinsic stiffness of the rodlike particles does not affect the moduli of the gel states very strongly.
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September 2012
Research Article|
September 01 2012
Probing structure in colloidal gels of thermoreversible rodlike virus particles: Rheology and scattering
Naveen Krishna Reddy;
Naveen Krishna Reddy
Department of Chemical Engineering, KU Leuven, University of Leuven
, W. de Croylaan 46, B-3001 Leuven, Belgium
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Zhenkun Zhang;
Zhenkun Zhang
a)
Department of Chemical Engineering, KU Leuven, University of Leuven
, W. de Croylaan 46, B-3001 Leuven, Belgium
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M. Paul Lettinga;
M. Paul Lettinga
Institute for Complex Systems-3, Forschungszentrum Jülich
, D-52425 Jülich, Germany
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Jan K. G. Dhont;
Jan K. G. Dhont
Institute for Complex Systems-3, Forschungszentrum Jülich
, D-52425 Jülich, Germany
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Jan Vermant
Jan Vermant
b)
Department of Chemical Engineering, KU Leuven, University of Leuven
, W. de Croylaan 46, B-3001 Leuven, Belgium
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a)
Present address: Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, P. R. China.
b)
Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 56, 1153–1174 (2012)
Article history
Received:
October 27 2011
Citation
Naveen Krishna Reddy, Zhenkun Zhang, M. Paul Lettinga, Jan K. G. Dhont, Jan Vermant; Probing structure in colloidal gels of thermoreversible rodlike virus particles: Rheology and scattering. J. Rheol. 1 September 2012; 56 (5): 1153–1174. https://doi.org/10.1122/1.4728335
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