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The effects of phenolic hydrogens and methyl substitute groups in organic dyes on their dispersion of multiple-walled carbon nanotubes

Zhang, W and Silva, SRP (2010) The effects of phenolic hydrogens and methyl substitute groups in organic dyes on their dispersion of multiple-walled carbon nanotubes CARBON, 48 (7). 2063 - 2071. ISSN 0008-6223

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Abstract

Bromocresol green (BCG) and bromophenol blue (BPB) in acidic and basic forms are used as dispersing agents to suspend multiple-walled carbon nanotubes (MWCNTs) into deionized water. The chemical structures of dye molecules are characterized by ultraviolet–visible-near infrared and nuclear magnetic resonance spectroscopic techniques. The presence of MWCNTs in water is evidenced by Raman spectra and the attachment of dye molecules to nanotubes is suggested by analysis of transmission electron microscope images. All dyes exhibit critical concentrations in dispersing MWCNTs. This may result from the formation of dye micelles, which induces osmotic pressure on MWCNTs and aids nanotube re-aggregation. The critical values of the basic dyes are lower than their acidic counterparts, which can be ascribed to the stronger hydrophilicity of basic dyes. The critical value of basic BCG is lower than basic BPB and this can be attributed to the effect of methyl substitutes in the former. Basic BCG is superior to basic BPB in stabilizing MWCNTs, which may result from the extra steric hindrance provided by the methyl substitutes.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Carbon. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Carbon, 48(7), June 2010, DOI 10.1016/j.carbon.2010.02.017.
Uncontrolled Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Materials Science, Multidisciplinary, Chemistry, Materials Science, SOLVENTS
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre
Depositing User: Symplectic Elements
Date Deposited: 21 Nov 2012 11:57
Last Modified: 23 Sep 2013 19:50
URI: http://epubs.surrey.ac.uk/id/eprint/735954

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