Preparation of stable dispersions of chemically reduced graphene oxide through noncovalent interactions with poly(N-isopropyl acrylamide)-grafted pluronic copolymer

Stable dispersions of chemically reduced graphene oxide (RGO) were prepared by simple noncovalent interaction with poly( N -isopropyl acrylamide) (PNIPAAm)-grafted Pluronic (NGP). Prepared NGP/RGO assembly solutions showed temperature-dependent optical absorbance change below or above their lower cr...

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Bibliographic Details
Published in:Journal of materials science 2013-05, Vol.48 (9), p.3357-3362
Main Authors: Kim, Myeong Jong, Kim, Dong Won, Yun, Jung Soo, Lee, Dae Hee, Oh, Yeon Jeong, Nam, Jeong A., Kim, Sung Ryoung, Lee, Ji Hoon, Park, Sung Young, Min, Byung-Gak, In, Insik
Format: Article
Language:English
Subjects:
Acrylamide
Amides
Anchoring
Aqueous solutions
Assembly
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Dispersions
Graft copolymers
Grafting
Graphene
Graphite
Hydrophobicity
Materials Science
Organic chemistry
Oxides
Plates
Polymer Sciences
Segments
Solid Mechanics
Temperature dependence
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Summary:Stable dispersions of chemically reduced graphene oxide (RGO) were prepared by simple noncovalent interaction with poly( N -isopropyl acrylamide) (PNIPAAm)-grafted Pluronic (NGP). Prepared NGP/RGO assembly solutions showed temperature-dependent optical absorbance change below or above their lower critical solution temperature (LCST). Interestingly, LCSTs of NGP/RGO assemblies were unaffected compared with LCSTs of pristine NGPs regardless of the degree of PNIPAAm grafting in NGPs probably because noncovalent anchoring between PNIPAAm chains and RGO plates in NGP/RGO assembly is weak. This supports that PNIPAAm grafting on Pluronic occurred preferentially in hydrophilic PEO segments because hydrophobic PPO segments of NGP must be strongly anchoring on hydrophobic surface of RGO plates while PEO segments will be extended from RGO surface to aqueous medium.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-7113-8