Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system

Herein, microwave-assisted direct coupling of Graphene Nanoplatelets (GNP) with polymers including hydroxyl ( OH) groups such as poly ethylene glycol (PEG) and bio-molecules like 4-phenylazophenol (Azo) are investigated. Among different water-soluble polymers, PEG has received unique consideration d...

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Main Authors:	Amiri, A., Shanbedi, M., Ahmadi, G., Eshghi, H., Chew, B.T., Kazi, S.N.
Format:	Article
Published:	2015
Subjects:	QD Chemistry
Online Access:	DOI: 10.1016/j.colsurfa.2015.09.032 DOI: 10.1016/j.colsurfa.2015.09.032

id	um-16128
recordtype	eprints
spelling	um-161282016-07-26T01:39:16Z Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system Amiri, A. Shanbedi, M. Ahmadi, G. Eshghi, H. Chew, B.T. Kazi, S.N. QD Chemistry Herein, microwave-assisted direct coupling of Graphene Nanoplatelets (GNP) with polymers including hydroxyl ( OH) groups such as poly ethylene glycol (PEG) and bio-molecules like 4-phenylazophenol (Azo) are investigated. Among different water-soluble polymers, PEG has received unique consideration due to its biocompatibility. Moreover, Azo-treated GNP can easily employ in long-term solar thermal storage. Thus, an electrophilic addition reaction under microwave irradiation is presented as an efficient procedure to functionalize GNP with Azo and PEG. In order to compare the activities of different catalysts under microwave irradiation, the direct coupling of GNP with Azo and PEG were performed in the presence of ZnCl2, FeCl2,TiCl4 and AlCl3, separately. The use of simple Lewis acids loading provides an electrophilic addition reaction in as little as 30 min, which provide a shortcut and prevent time-consuming and multiple steps approaches. Interestingly, PEG-treated GNP has no cross-linking of the flakes, which this allows the production of more dispersed GNP in aqueous media. Investigation of colloidal stability using particle absorbance measurement showed successful results in terms of stability with very low sediment. (C) 2015 Elsevier B.V. All rights reserved. 2015 Article PeerReviewed DOI: 10.1016/j.colsurfa.2015.09.032 Amiri, A.; Shanbedi, M.; Ahmadi, G.; Eshghi, H.; Chew, B.T.; Kazi, S.N. (2015) Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system. Colloids And Surfaces A-Physicochemical And Engineering Aspects <http://eprints.um.edu.my/view/publication/Colloids_And_Surfaces_A-Physicochemical_And_Engineering_Aspects.html>, 487. pp. 131-141. ISSN 0927-7757 http://eprints.um.edu.my/16128/
repository_type	Digital Repository
institution_category	Local University
institution	University Malaya
building	UM Research Repository
collection	Online Access
topic	QD Chemistry
spellingShingle	QD Chemistry Amiri, A. Shanbedi, M. Ahmadi, G. Eshghi, H. Chew, B.T. Kazi, S.N. Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
description	Herein, microwave-assisted direct coupling of Graphene Nanoplatelets (GNP) with polymers including hydroxyl ( OH) groups such as poly ethylene glycol (PEG) and bio-molecules like 4-phenylazophenol (Azo) are investigated. Among different water-soluble polymers, PEG has received unique consideration due to its biocompatibility. Moreover, Azo-treated GNP can easily employ in long-term solar thermal storage. Thus, an electrophilic addition reaction under microwave irradiation is presented as an efficient procedure to functionalize GNP with Azo and PEG. In order to compare the activities of different catalysts under microwave irradiation, the direct coupling of GNP with Azo and PEG were performed in the presence of ZnCl2, FeCl2,TiCl4 and AlCl3, separately. The use of simple Lewis acids loading provides an electrophilic addition reaction in as little as 30 min, which provide a shortcut and prevent time-consuming and multiple steps approaches. Interestingly, PEG-treated GNP has no cross-linking of the flakes, which this allows the production of more dispersed GNP in aqueous media. Investigation of colloidal stability using particle absorbance measurement showed successful results in terms of stability with very low sediment. (C) 2015 Elsevier B.V. All rights reserved.
format	Article
author	Amiri, A. Shanbedi, M. Ahmadi, G. Eshghi, H. Chew, B.T. Kazi, S.N.
author_facet	Amiri, A. Shanbedi, M. Ahmadi, G. Eshghi, H. Chew, B.T. Kazi, S.N.
author_sort	Amiri, A.
title	Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
title_short	Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
title_full	Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
title_fullStr	Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
title_full_unstemmed	Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
title_sort	microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system
publishDate	2015
url	DOI: 10.1016/j.colsurfa.2015.09.032 DOI: 10.1016/j.colsurfa.2015.09.032
first_indexed	2018-09-06T06:35:06Z
last_indexed	2018-09-06T06:35:06Z
_version_	1610838920795258880

Microwave-assisted direct coupling of graphene nanoplatelets with poly ethylene glycol and 4-phenylazophenol molecules for preparing stable-colloidal system

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