Aqueous stability and mobility of C60 complexed by sodium dodecyl benzene sulfonate surfactant

Abstract

Surfactant complexation may have significant effects on the environmental behavior of nano-particles. In order to understand the ecological exposure of nano-materials, it is important to determine the stability and mobility of surfactant-complexed nano-materials in aqueous systems. In this study, the aggregation and transport of C 60 complexed by the surfactant sodium dodecyl benzene sulfonate (SDBS) were investigated. It was found that SDBS-complexed C 60 had a ζ-potential of −49.5 mV under near-neutral pH conditions and remained stable during an aging period of 15 days. It had a critical coagulation concentration of 550 mmol/L for NaCl, which was higher than common natural colloids and many kinds of raw nano-materials, and was comparable to those of many kinds of surface-modified nano-materials. SDBS enhanced the stability of C 60 colloid; however, at the same time, it also enhanced the colloidal particle aggregation rate. Much higher mobility was found for SDBS-complexed C 60 than C 60 colloid. Increase in ionic strength, Ca 2+ concentration or Al 3+ concentration decreased the mobility. In general, SDBS-complexed C 60 had high stability and mobility.

Fullerol-facilitated transport of copper ions in water-saturated porous media: Influencing factors and mechanism

“…S4 that the fullerol dispersion has a considerably high stability since its concentra- tion almost did not change for 30 days. This result proves that the fullerol dispersion has a higher mobility than SWNTs modified by SDS of a low concentration [26], oxidized MWNTs [27], and nC 60 colloids [10].…”

“…Under the near-neutral pH condition, the zeta potential is approximate −30 to −31 mV. In the aqueous environment, zeta potential of nC 60 dispersion is from −15.1 to −29.9 mV in the pH range of 4.3-9.1 [10]. Generally, a higher absolute value of zeta potential of a dispersion presents a higher stability in the aqueous environment.…”

“…Previous studies have elaborately evaluated the stability and mobility of typical CNMs, e.g. fullerenes, carbon nanotubes (CNTs), graphene and their derivatives [9][10][11][12][13]. During the production and/or utilization process, CNMs could easily obtain high environmental stability by redox reactions and surface complexation, and thus expose and transport for a long distance in environmental media like water, soil and aquifer [14].…”

Biosurfactant-mediated mobility of graphene oxide nanoparticles in saturated porous media

“…50 Finally, the steric effect induced by the deposited surfactant molecules also contributed to saponin's enhancement of GO transport. 66,75,78…”

“…50 Finally, the steric effect induced by the deposited surfactant molecules also contributed to saponin's enhancement of GO transport. 66,75,78 Moreover, theoretical calculations that depend on XDLVO theory demonstrated that the particle-collector interaction energy proles were closely linked to the addition of saponin (Fig. S10 †).…”