Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 47, Issue -, Pages 771-778Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.05.100
Keywords
Carbon nanotubes; Dispersion; Sonication; Alkaline environment; Cement composites
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Funding
- Departamento Administrativo de Ciencia, Tecnologia e Innovacion (COLCIENCIAS) Colombia through Jovenes Investigadores e Innovadores program
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This work studies the effect of superplasticizer and Ca(OH)(2) on the stability of OH-functionalized multi walled carbon nanotube (MWCNT)/water dispersions produced via sonication. Dispersion of the MWCNT/water/superplasticizer dispersions was quantified using UV-Vis spectroscopy, the damage induced on the MWCNT was identified using RAMAN spectroscopy and the effect of Ca(OH)(2) stability of the dispersions was identified using Zeta potential and FTIR spectroscopy. It was found that Ca(OH)(2) affects the stability of MWCNT dispersions due to its interaction with negative charges of the OH functional groups, which hinders the electrostatic repulsion between MWCNT and superplasticizer molecules, generating re-agglomeration of the MWCNT. (C) 2013 Elsevier Ltd. All rights reserved.
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