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Issue 15, 2018
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Liquid crystalline behaviour of self-assembled LAPONITE®/PLL–PEG nanocomposites

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Abstract

Synthetic LAPONITE®–clay particles with platelet-like shape display strong aging when dispersed in aqueous solutions, preventing the latter from reaching their natural liquid-crystalline equilibrium state. Here we introduce a facile method that successfully prevents this aging behaviour and enables accessing the systems’ liquid-crystal and crystalline phases. We graft the comb-like polymer PLL–PEG (poly(L-lysine)-g-poly(ethylene glycol)) onto the clay surfaces from solution, thereby screening the negative surface charges and thus ensuring steric stabilisation. We show zeta-sizer and rheology measurements, respectively, confirming complete steric coating and that aging of dilute samples is completely suppressed even after a year. Using evaporation as a means to concentrate the particles, we observe various liquid crystalline textures under a polarized optical microscope (POM). Upon sequential spreading and drying, we are also able to obtain transparent films with hierarchical architecture.

Graphical abstract: Liquid crystalline behaviour of self-assembled LAPONITE®/PLL–PEG nanocomposites

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Article information


Submitted
10 Aug 2017
Accepted
02 Feb 2018
First published
19 Feb 2018

Soft Matter, 2018,14, 2782-2788
Article type
Paper

Liquid crystalline behaviour of self-assembled LAPONITE®/PLL–PEG nanocomposites

P. Xu, Y. Lan, Z. Xing and E. Eiser, Soft Matter, 2018, 14, 2782
DOI: 10.1039/C7SM01613A

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