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Newtonian to non-Newtonian fluid transition of a model transient network


The viscosity of gel-forming fluids is notoriously complex and its study can benefit from new model systems that enable a detailed control of the network features. Here we use a novel and simple microfluidic-based active microrheology approach to study the transition from Newtonian to non-Newtonian behavior in a DNA hydrogel whose structure, connectivity, density of bonds, bond energy and kinetics are strongly temperature dependent and well known. In a temperature range of 15 °C, the system reversibly and continuously transforms from a Newtonian dispersion of low-valence nanocolloids into a strongly shear-thinning fluid, passing through a set of intermediate states where it behaves as a power-law fluid. We demonstrate that the knowledge of network topology and bond free energy enables to quantitatively predict the observed behavior using established rheology models.

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Publication details

The article was received on 23 Feb 2018, accepted on 16 Apr 2018 and first published on 17 Apr 2018

Article type: Paper
DOI: 10.1039/C8SM00373D
Citation: Soft Matter, 2018, Accepted Manuscript
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    Newtonian to non-Newtonian fluid transition of a model transient network

    G. Nava, Y. Tie, V. Vitali, P. Minzioni, I. Cristiani, F. Bragheri, R. Osellame, L. Bethge, S. Klussmann, E. M. Paraboschi, R. Asselta and T. Bellini, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00373D

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