Surface functionalization effect of graphene oxide on its liquid crystalline and assembly behaviors

Surface functionalization effect of graphene oxide (GO) on its liquid crystalline and assembly behavior was investigated to examine the potential of surface modification strategy to produce a strong assembled structure. As a model study, a carboxylated GO (GO-COOH) was synthesized and its liquid cry...

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Bibliographic Details
Published in:Applied surface science 2019-06, Vol.480, p.514-522
Main Authors: Hong, Yu Lim, Ryu, Seongwoo, Jeong, Hyeon Su, Kim, Young-Kwan
Format: Article
Language:English
Subjects:
Assembly
Colloid
Graphene oxide
Liquid crystal
Surface functionalization
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Summary:Surface functionalization effect of graphene oxide (GO) on its liquid crystalline and assembly behavior was investigated to examine the potential of surface modification strategy to produce a strong assembled structure. As a model study, a carboxylated GO (GO-COOH) was synthesized and its liquid crystalline and assembly behavior were systematically compared with pristine GO. Based on this study, we found that the transition concentration of GO from isotropic to biphasic phase decreased with carboxylation and the resulting lamella-assembled structures of GO-COOH exhibited much higher mechanical properties compared to GO after Ca2+ ion cross-linking. [Display omitted] •Synthesis of carboxylated graphene oxide•Enhancement of aqueous dispersibility of graphene oxide•Lowering critical concentration of graphene oxide for liquid crystal transition•Well-aligned assembly with enhanced mechanical properties
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2019.03.023