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Liquid crystal self-assembly of upconversion nanorods enriched by depletion forces for mesostructured material preparation

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Abstract

Monodisperse rod-like colloidal particles are known for spontaneously forming both nematic and smectic liquid crystal phases, but their self-assembly was typically exploited from the fundamental soft condensed matter physics perspective. Here we demonstrate that depletion interactions, driven by non-adsorbing polymers like dextran and surfactants, can be used to enrich the self-organization of photon-upconversion nanorods into orientationally ordered nematic and smectic-like membrane colloidal superstructures. We study thermodynamic phase diagrams and demonstrate polarization-dependent photon upconversion exhibited by the ensuing composites, which arises from the superposition of unique properties of the solid nanostructures and the long-range ordering enabled by liquid crystalline self-organization. Finally, we discuss how our method of utilizing self-assembly due to the steric and electrostatic interactions, along with attractive depletion forces, can enable technological uses of lyotropic colloidal liquid crystals and mesostructured composite materials enabled by them, even when they are formed by anisotropic nanoparticles with relatively small aspect ratios.

Graphical abstract: Liquid crystal self-assembly of upconversion nanorods enriched by depletion forces for mesostructured material preparation

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Publication details

The article was received on 07 Sep 2017, accepted on 17 Jan 2018 and first published on 17 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR06663E
Citation: Nanoscale, 2018, Advance Article
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    Liquid crystal self-assembly of upconversion nanorods enriched by depletion forces for mesostructured material preparation

    Y. Xie, Y. Li, G. Wei, Q. Liu, H. Mundoor, Z. Chen and I. I. Smalyukh, Nanoscale, 2018, Advance Article , DOI: 10.1039/C7NR06663E

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