Dispersion Stability of Graphene Nanoplatelets (GNPs) and Noncovalent-Functionalization of GNPs with Chitosan in Ethanol

A facile method for surface modification of graphene nanoplatelets (GNPs) in the presence of chitosan was developed to improve their interfacial interaction and dispersion within polymer matrix. The selection of a suitable organic dispersant for GNPs was performed using a sedimentation test of the G...

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Published inApplied Mechanics and Materials Vol. 761; no. Recent Technologies in Design, Management and Manufacturing; pp. 447 - 451
Main Authors Lau, Kok Tee, Yaakub, Juliana, Abd Manaf, Mohd Edeerozey, Shueb, Mohammed Iqbal, Mohamad, Noraiham, Abd Razak, Jeeferie
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 01.05.2015
Subjects
Chitosan
Dispersants
Dispersion
Dispersions
Ethanol
Ethyl alcohol
Graphene
Nanostructure
Sedimentation
Chitosan
Functionalization
Dispersion
Graphene Nanoplatelets (GNPs)
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Abstract A facile method for surface modification of graphene nanoplatelets (GNPs) in the presence of chitosan was developed to improve their interfacial interaction and dispersion within polymer matrix. The selection of a suitable organic dispersant for GNPs was performed using a sedimentation test of the GNPs in different organic media. GNPs exhibited the highest stability in ethanol dispersant after 3 weeks sedimentation test, and this was supported by TEM observation, which shows that GNPs dispersed well and fully exfoliated into individual sheets in ethanol. The dispersed GNPs in the ethanol dispersion were then functionalized with chitosan-acid solution, filtered and oven-dried into powder form for further characterization. FTIR spectra further verified that the formation of amide linkage between hydroxyl and carboxylic groups of GNP with the amide group of chitosan. The possible functionalization mechanism of GNPs with chitosan was also proposed.
AbstractList A facile method for surface modification of graphene nanoplatelets (GNPs) in the presence of chitosan was developed to improve their interfacial interaction and dispersion within polymer matrix. The selection of a suitable organic dispersant for GNPs was performed using a sedimentation test of the GNPs in different organic media. GNPs exhibited the highest stability in ethanol dispersant after 3 weeks sedimentation test, and this was supported by TEM observation, which shows that GNPs dispersed well and fully exfoliated into individual sheets in ethanol. The dispersed GNPs in the ethanol dispersion were then functionalized with chitosan-acid solution, filtered and oven-dried into powder form for further characterization. FTIR spectra further verified that the formation of amide linkage between hydroxyl and carboxylic groups of GNP with the amide group of chitosan. The possible functionalization mechanism of GNPs with chitosan was also proposed.
Author Yaakub, Juliana
Lau, Kok Tee
Abd Manaf, Mohd Edeerozey
Abd Razak, Jeeferie
Mohamad, Noraiham
Shueb, Mohammed Iqbal
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Cites_doi 10.1016/j.materresbull.2010.12.024
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10.1016/j.carbon.2007.02.034
10.1177/0095244312451935
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10.1016/j.progpolymsci.2010.07.005
10.1016/j.carbon.2008.02.008
10.1016/j.polymer.2012.05.039
10.1021/ma100572e
10.1021/ar300138e
10.1002/app.40713
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SubjectTerms Chitosan
Dispersants
Dispersion
Dispersions
Ethanol
Ethyl alcohol
Graphene
Nanostructure
Sedimentation
Title Dispersion Stability of Graphene Nanoplatelets (GNPs) and Noncovalent-Functionalization of GNPs with Chitosan in Ethanol
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