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

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C7NR06663E· OSTI ID:1595077
 [1];  [2];  [3];  [3];  [3];  [2];  [4]
  1. Univ. of Colorado, Boulder, CO (United States); Beihang Univ., Beijing (China); University of Colorado Boulder
  2. Beihang Univ., Beijing (China)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Univ. of Colorado, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States). Renewable and Sustainable Energy Inst.
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.
Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0010305
OSTI ID:
1595077
Alternate ID(s):
OSTI ID: 1539947
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 9 Vol. 10; ISSN NANOHL; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Depletion-driven morphological transitions in hexagonal crystallites of virus rods journal January 2019

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