Stabilizing effect of methylcellulose on the dispersion of multi-walled carbon nanotubes in cementitious composites
Author:
Du Mingrui12, Gao Yuan1, Han Guansheng1, Li Luan1, Jing Hongwen1
Affiliation:
1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology , Xuzhou 221116 , China 2. School of Water Conservancy Engineering, Zhengzhou University , Zhengzhou 450001 , China
Abstract
Abstract
Multi-walled carbon nanotubes (MWCNTs) have been added in the plain cementitious materials to manufacture composites with the higher mechanical properties and smart behavior. The uniform distributions of MWCNTs is critical to obtain the desired enhancing effect, which, however, is challenged by the high ionic strength of the cement pore solution. Here, the effects of methylcellulose (MC) on stabilizing the dispersion of MWCNTs in the simulated cement pore solution and the viscosity of MWCNT suspensions werestudied. Further observations on the distributions of MWCNTs in the ternary cementitious composites were conducted. The results showed that MC forms a membranous envelope surrounding MWCNTs, which inhibits the adsorption of cations and maintains the steric repulsion between MWCNTs; thus, the stability of MWCNT dispersion in cement-based composites is improved. MC can also work as a viscosity adjuster that retards the Brownian mobility of MWCNTs, reducing their re-agglomerate within a period. MC with an addition ratio of 0.018 wt.% is suggested to achieve the optimum dispersion stabilizing effect. The findings here provide a way for stabilizing the other dispersed nano-additives in the cementitious composites.
Publisher
Walter de Gruyter GmbH
Subject
Surfaces, Coatings and Films,Process Chemistry and Technology,Energy Engineering and Power Technology,Biomaterials,Medicine (miscellaneous),Biotechnology
Reference49 articles.
1. Iijima S., Helical microtubules of graphitic carbon, Nature, 1991, 354(6348), 56-58. 2. Ajayan P.M., Nanotubes from Carbon, Chem Rev., 1999, 99(7), 1787-1800. 3. Yu M.F., Lourie O., Dyer M.J., Moloni K., Kelly T.F., Ruoff R.S., Strength and Breaking Mechanism of Multiwalled Carbon Nanotubes under Tensile Load, Science, 2000, 287(5453), 637-640. 4. Duan W.H., Wang Q., Liew K.M., He X.Q., Molecular mechanics modeling of carbon nanotube fracture, Carbon, 2007, 45(9), 1769-1776. 5. Coleman J.N., Khan U., Blau W.J., Gun’Ko Y.K., Small but strong: A review of the mechanical properties of carbon nanotube–polymer composites, Carbon, 2006, 44(9), 1624-1652.
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