Comparative study of carbon nanotube dispersion using surfactants

Effect of pre and Post-Dispersion on Electro-Thermo-Mechanical Properties of a Graphene Enhanced Epoxy

“…They reduce the surface tension and improve compatibility between nanoparticles and solvent. Depending of the nature of surfactant used, it may act by steric repulsion force, coulombic attraction, physical adsorption or hydrogen bonding [39,40]. Two categories of surfactant exist: (i) ionic e.g.…”

“…Addition of a surfactant increases the solubility of the graphene in a solvent as well as the compatibility between the epoxy resin and nanoparticles [40]. The physical adsorption of the chemical group induces less damages onto the particles than a classic functionalisation which makes this chemical modification really attractive for graphene/ epoxy nanocomposites [24].…”

“…However, due to the close structure between CNT and GNP, previous studies made on CNT can be used as a base and inspiration for the functionalisation of GNP. Some studies were made on the advantages of using one kind of surfactant compare to the other [40,42]. Both categories show similar results, but ionic surfactant requires determination of the zero point of charge of the particles and to modify their surface charges [19,41].…”

“…Bai et al [43] found that the shorter the hydrophilic segment of surfactant Triton X, the higher the suspendability of the nanoparticles, with the best adsorption quality obtained with Triton-114. Richa et al [40] studied four different surfactants: Triton X-100, Tween 20, Tween 80, and SDS. Triton X-100 showed the highest dispersion power over other surfactants due to its benzene ring, which enhances the adsorption on nanoparticles by the π-π interaction.…”

Estudo das dispersões aquosas de nanotubos de carbono utilizando diferentes surfactantes

“…No entanto, funcionalizações químicas agressivas causam um aumento nos defeitos nas paredes laterais, o que pode alterar as propriedades mecânicas e elétricas dos CNTs. [7][8][9][10] Uma ampla variedade de surfactantes (aniônico, catiônico e não iônico) tem sido estudada para dispersões de CNTs, como lauril sulfato de sódio (SDS), 11,12 dodecil benzeno sulfato de sódio (SDBS), 13 brometo de cetiltrimetil amônio (CTAB), 14 geralmente é necessária uma alta concentração de surfactantes para se obter dispersões estáveis de CNTs, que é inconveniente devido ao alto custo dos surfactantes, seus impactos ambientais e por restringir o uso destas suspensões em materiais compósitos. 9 Considerando a relevância dos surfactantes nas dispersões de CNTs, o objetivo do presente estudo foi comparar dois surfactantes, SDS e Tween 80, para dispersão de nanotubos através das técnicas de tensão superficial, condutividade, fluorescência e espectroscopia de UV-vis.…”