Mixed micelles of cationic–nonionic surfactants: NMR self-diffusion studies of Triton X-100 and cetyltrimethylammonium bromide in aqueous solution

Fang, Xun; Zhao, Suoqi; Mao, Shizhen; Yu, Jiahui; Du, Yikui

doi:10.1007/s00396-002-0797-6

Cited by 36 publications

(30 citation statements)

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“…Consequently, a lower potential energy occurs in the mixed micelles as the mole fraction of CTAB increases since the charge repulsion between the CTAB molecules is minimized. The same as in the case of CTAB/TX-100 [14], the disagreement between the ratios of cmc * 1 to cmc * 2 and the molar ratios of CTAB to TX-100 in the solution suggests that the mixed micellization is not synchronous. However, this differs from the CTAB/TX-100 system, where the cmc * 2 is lower than cmc * 1 when α > 0.50 and higher than cmc * 1 when α < 0.50, in that in the CTAB/Brij-35 system the cmc * 2 is always lower than cmc * 1 .…”

Section: Resultsmentioning

confidence: 70%

“…So the D exp given in Table 1 are the average value of all the peaks for a given surfactant. One aspect of self-diffusion measurement that makes it especially interesting for surfactant systems is that the diffusion of all components can be monitored simultaneously, and similarly to the CTAB/TX-100 system [14], we can fit each of their Table 2, in which the subscripts 1 and 2 represent CTAB and Brij-35, respectively. The sum of cmc * 1 and cmc * 2 gives the critical micellar concentration of the mixed solution (cmc * ), also shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The NMR self-diffusion coefficients can also be used to study the mixed solution properties. By using this means, we have studied CTAB/TX-100 surfactant mixtures [14]. Some important dynamical micellization parameters, i.e., the critical micelle concentration of each solute in the mixtures and the composition and selfdiffusion coefficients of the mixed micelles, have been obtained.…”

Section: Introductionmentioning

confidence: 99%

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Properties of polyethylene glycol (23) lauryl ether with cetyltrimethylammonium bromide in mixed aqueous solutions studied by self-diffusion coefficient NMR

Gao

Zhu

Yang

et al. 2004

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Properties of polyethylene glycol (23) lauryl ether with cetyltrimethylammonium bromide in mixed aqueous solutions studied by self-diffusion coefficient NMR

Gao

Zhu

Yang

et al. 2004

Journal of Colloid and Interface Science

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“…35 As TX-100 is a non-ionic surfactant the mutual diffusion coefficient in dilute solutions is equal to the self-diffusion coefficient. …”

Section: Diffusion Coefficientsmentioning

confidence: 99%

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 1. Pure Surfactants on Silica

2011

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Total internal reflection Raman spectroscopy provides a sensitive probe of surfactants adsorbed at an interface. A visible laser passes through a silica hemisphere and reflects off the flat silica–water interface. An evanescent wave probes ∼100 nm of solution below the surface, and the Raman scattering from this region provides chemically specific information on the molecules present. Here we look at both equilibrium and kinetic aspects of the adsorption of the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the nonionic surfactant Triton X-100 in single-component systems. We use the well-defined wall jet geometry to provide known hydrodynamics for the adsorption process. The well-defined hydrodynamics allows us to model the mass transport of surfactant to the surface which is coupled with a kinetic model consistent with the Frumkin isotherm to produce a complete model of the adsorption process. The fit between this model and the experimental results provides insight into the interactions on the surface.

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“…Furthermore, the use of mixed collectors for enhanced flotation and selectivity has only recently been recognized. Therefore, several studies focusing on mixed cationic/nonionic surfactant systems have recently been carried out [18][19][20][21]. In general, these mixed surfactant systems typically exhibit considerably higher surface activities than their individual components, leading to better wetting, solubilizing, and foaming behavior.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Adsorption and Flotation of New Mixed Cationic/Nonionic Collectors on Muscovite

Jiang

Yang

et al. 2017

Minerals

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Abstract:The mixed cationic collector cetyltrimethylammonium chloride (CTAC) and nonionic collector octanol (OCT) was found to exhibit a synergistic effect on the flotation and adsorption of muscovite. To understand the underlying synergistic mechanism, flotation, contact angle, surface tension, and adsorption measurements were carried out. The results obtained from flotation measurements indicated that the mixed CTAC/OCT exhibits a better collecting ability than CTAC or OCT. The recovery of muscovite with CTAC only rapidly decreased from 97.25% at pH 2.64 to 75.26% at pH 5.82, followed by a flat horizontal at a pH is higher than 6. In contrast, a high recovery of greater than 85% muscovite was observed using mixed CTAC/OCT at α CTAC = 0.67 (the mole ratio of CTAC:OCT = 2:1) over the investigated pH range. From the surface activity parameters (CMC, γ CMC , Γ max , A min ) estimated from surface measurements and interaction parameters (β m , β σ ), in addition to the micellar and interfacial compositions (x m 1 , x σ 1 ) obtained from the theory of regular solutions, a synergistic effect is evident in the mixed micelle and at the water/air interface. Moreover, the mixed CTAC/OCT at α CTAC = 0.67 exhibited the maximum synergistic interaction. The results obtained from surface tension measurements indicated that the mixed CTAC/OCT exhibits considerably higher surface activities compared to single CTAC or OCT. The contact angle results confirmed that the mixed CTAC/OCT is a better collector than the individual CTAC or OCT for the flotation of muscovite. According to the results obtained from adsorption experiments, compared with that of individual CTAC or OCT, the amounts of CTAC and OCT adsorbed on the muscovite surface are considerably increase in the mixed systems because of co-adsorption. Based on these results, the mixed CTAC/OCT exhibits a remarkable synergistic effect during the flotation and adsorption of muscovite.

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Mixed micelles of cationic–nonionic surfactants: NMR self-diffusion studies of Triton X-100 and cetyltrimethylammonium bromide in aqueous solution

Cited by 36 publications

References 0 publications

Properties of polyethylene glycol (23) lauryl ether with cetyltrimethylammonium bromide in mixed aqueous solutions studied by self-diffusion coefficient NMR

Properties of polyethylene glycol (23) lauryl ether with cetyltrimethylammonium bromide in mixed aqueous solutions studied by self-diffusion coefficient NMR

Surfactant Adsorption Kinetics by Total Internal Reflection Raman Spectroscopy. 1. Pure Surfactants on Silica

Synergistic Adsorption and Flotation of New Mixed Cationic/Nonionic Collectors on Muscovite

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