Self-healing guar gum and guar gum-multiwalled carbon nanotubes nanocomposite gels prepared in an ionic liquid

Copyright © 2013 Elsevier Ltd. All rights reserved.

Bibliographic Details
Published in:Carbohydrate polymers, Vol. 98, No. 1 (2013), p. 1025-30
Main Author: Sharma, Mukesh
Other Involved Persons: Mondal, Dibyendu ; Mukesh, Chandrakant ; Prasad, Kamalesh
Format: electronic Article
Language:English
ISSN:1879-1344
Item Description:Date Completed 26.03.2014
Date Revised 25.11.2016
published: Print-Electronic
Citation Status MEDLINE
Copyright: From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Physical Description:Online-Ressource
DOI:10.1016/j.carbpol.2013.06.074
Subjects:
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520 |a Guar gum is a galactomannan extracted from the seed of the leguminous shrub Cyamopsis tetragonoloba. It was found to form a soft viscoelastic gel in 1-butyl-3-methylimidazolium chloride, an ionic liquid at an optimized concentration of 10%w/v. A nanocomposite gel of the gum with enhanced strength could be prepared with 0.2%w/v of multiwalled carbon nanotubes (MWCNTs) in the ionic liquid. When the gels thus prepared were subjected to surface fractures or bisected completely, they found to self-heal at room temperature without any external interventions. The self-healing process could be repeated several times. These viscoelastic gel systems showed thixotropic nature and recovery of the storage modulus with time for several cycles was observed upon rheological investigations. The interaction took place between ionic liquid, guar gum and MWCNT was studied by SEM, TEM, FT-IR, powder XRD and rheometry. The results suggested that, upon standing at room temperature development of electrostatic interactions and the van der Waals interactions among the ionic liquid molecules facilitated the formation of reversible noncovalent bonds and eventually activated the self-healing in the gel systems through appropriate chain entanglements 
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700 1 |a Prasad, Kamalesh 
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