Nonequilibrium phase transitions of sheared colloidal microphases: Results from dynamical density functional theory

Physical Review. E
Daniel Stopper, Roland Roth

Abstract

By means of classical density functional theory and its dynamical extension, we consider a colloidal fluid with spherically symmetric competing interactions, which are well known to exhibit a rich bulk phase behavior. This includes complex three-dimensional periodically ordered cluster phases such as lamellae, two-dimensional hexagonally packed cylinders, gyroid structures, or spherical micelles. While the bulk phase behavior has been studied extensively in earlier work, in this paper we focus on such structures confined between planar repulsive walls under shear flow. For sufficiently high shear rates, we observe that microphase separation can become fully suppressed. For lower shear rates, however, we find that, e.g., the gyroid structure undergoes a kinetic phase transition to a hexagonally packed cylindrical phase, which is found experimentally and theoretically in amphiphilic block copolymer systems. As such, besides the known similarities between the latter and colloidal systems regarding the equilibrium phase behavior, our work reveals further intriguing nonequilibrium relations between copolymer melts and colloidal fluids with competing interactions.

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Citations

Feb 20, 2019·Physical Review. E·T SchindlerJ M Brader
Jun 4, 2020·The Journal of Chemical Physics·J PȩkalskiA Z Panagiotopoulos
Nov 4, 2020·The Journal of Physical Chemistry. B·Horacio SernaWojciech T Góźdź
Dec 29, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Horacio SernaW T Góźdź

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