Orientation effect on the rheology of graphene oxide dispersions in isotropic phase, ordered isotropic biphase, and discotic phase

2021 ◽  
Vol 65 (5) ◽  
pp. 791-806
Author(s):  
Gyeong Min Choi ◽  
Minji Park ◽  
Seung Yol Jeong ◽  
Heon Sang Lee
Keyword(s):  
Graphene Oxide ◽  
Orientation Effect ◽  
Isotropic Phase

Liquid Crystal Assisted Selective Separation of Large Graphene Oxide and its Size Dependent Oxygen Reduction Catalytic Effect

2014 ◽  
Vol 95 ◽  
pp. 23-26
Author(s):  
Kyung Eun Lee ◽  
Ji Eun Kim ◽  
Joon Won Lim ◽  
Sang Ouk Kim
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction ◽  
Nematic Phase ◽  
Nitrogen Doping ◽  
Liquid Crystalline ◽  
Reduction Reaction ◽  
Isotropic Phase ◽  
Size Dependent ◽  
Reduced Graphene ◽  
Onsager Theory

We introduce a new self-separation of graphene oxide flakes exploiting liquid crystalline phase formation. Moderately concentrated discotic GO aqueous solution spontaneously phase separates into isotropic phase and nematic phase. According to Onsager theory, larger flakes with higher aspect ratio tends to form nematic phase, while smaller flakes remain in isotropic phase. Simple isolation of bottom nematic phase (large graphene oxide; LGO) resulted in the LGO dominant dispersion preparation. We employed this size selection principle to investigate the influence of GO flake size upon the material properties of reduced graphene oxide. The electrical properties of spin cast rGO films are thoroughly investigated in terms of the GO flake sizes in the precursor aqueous dispersions. Interestingly, nitrogen doping in order to inject more electron charge carrier exhibit different behavior following flake size. Therefore, it was experimentally confirmed that quaternary nitrogen doping site acts as the dominant catalytic site in oxygen reduction reaction.

ANISOTROPY OF MAGNETO-OPTICAL ORIENTATION EFFECT IN SINGLE CRYSTAL OF NICKEL

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-1061-C1-1063
Author(s):  
G. S. KRINCHIK ◽  
E. A. GANSHINA ◽  
V. S. GUSHCHIN
Keyword(s):  
Single Crystal ◽  
Orientation Effect ◽  
Optical Orientation

LDPE Building Blocks with Controlled Graphene-oxide Interfaces: Composite Manufacturing and Electric Property Investigation

2016 ◽  
Vol 136 (2) ◽  
pp. 93-98 ◽  
Author(s):  
Paolo Mancinelli ◽  
Valentina Santangelo ◽  
Davide Fabiani ◽  
Andrea Saccani ◽  
Maurizio Toselli ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Building Blocks ◽  
Electric Property ◽  
Oxide Interfaces ◽  
Composite Manufacturing

THERMAL PERFORMANCE OF GRAPHENE OXIDE NANOFLUID IN MICROCHANNEL HEAT EXCHANGER

2020 ◽  
Vol 27 (5) ◽  
pp. 439-461
Author(s):  
Yue Seong Ong ◽  
Ku Zilati Ku Shaari ◽  
Afiq Mohd Laziz ◽  
Inn Leon Lu ◽  
Mohamad Fakhrul Ridhwan Samsudin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Microchannel Heat Exchanger
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