2000
DOI: 10.1021/la9910935
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Counterion Effects on Hexadecyltrimethylammonium Surfactant Adsorption and Self-Assembly on Silica

Abstract: Combining optical reflectometry and atomic force microscopy (AFM), we have studied the effects of the surfactant counterion on the adsorption isotherms, kinetics, and layer structure for cationic hexadecyltrimethylammonium (C16TA + ) surfactants on negatively charged silica surfaces. The adsorption kinetics suggest that the adsorption mechanism changes at the critical micelle concentration (cmc). A change in mechanism is also suggested by differences observed in the state of interfacial self-assembly on either… Show more

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Cited by 213 publications
(310 citation statements)
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“…Consistent with this ordering, the critical micelle concentration (cmc) increases in the order cmc(CTAT) < cmc(CTAB) < cmc(CTAC). Similarly, CTAB adsorption at the silica/water interface displays greater cooperativity below the cmc and a higher adsorption plateau than CTAC adsorption (22). The latter effect is due to the self-assembly of adsorbed aggregates that have lower curvature in the plane of adsorption for CTAB as compared to that for CTAC (elongated "ribbons" for CTAB and circular "disks" for CTAC).…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Consistent with this ordering, the critical micelle concentration (cmc) increases in the order cmc(CTAT) < cmc(CTAB) < cmc(CTAC). Similarly, CTAB adsorption at the silica/water interface displays greater cooperativity below the cmc and a higher adsorption plateau than CTAC adsorption (22). The latter effect is due to the self-assembly of adsorbed aggregates that have lower curvature in the plane of adsorption for CTAB as compared to that for CTAC (elongated "ribbons" for CTAB and circular "disks" for CTAC).…”
Section: Introductionmentioning
confidence: 99%
“…Since there are strong specific counterion effects on ionic surfactant micellization and adsorption (15)(16)(17)(18)(19)(20)(21)(22), here we consider specific counterion effects on the co-adsorption mechanism. We consider chloride, bromide, and p-toluene sulfonate (tosylate) counterions that are distinguished by widely differing binding affinities for CTA + micelles.…”
Section: Introductionmentioning
confidence: 99%
“…The large surface area of the platelet faces, and their negative charge, may favor the aggregation of cationic surfactant molecules as hemimicelles and micelles. Recently, the interaction of cetyltrimethylammonium bromide (CTAB) with model surfaces such as silica, titanium dioxide, and mica has been probed using several techniques, including atomic force microscopy, 12,13 attenuated total reflectance Fourier transform infrared (spectroscopy), 14,15 and optical reflectometry. 13 Furthermore, some studies have looked at the coadsorption of both anionic and cationic surfactants.…”
Section: Abend and Lagalymentioning
confidence: 99%
“…Recently, the interaction of cetyltrimethylammonium bromide (CTAB) with model surfaces such as silica, titanium dioxide, and mica has been probed using several techniques, including atomic force microscopy, 12,13 attenuated total reflectance Fourier transform infrared (spectroscopy), 14,15 and optical reflectometry. 13 Furthermore, some studies have looked at the coadsorption of both anionic and cationic surfactants. Li and Tripp 14 showed that mixed micelles of sodium dodecyl sulfate and CTAB form on titanium dioxide.…”
Section: Abend and Lagalymentioning
confidence: 99%
“…Assim, a afinidade de ligação influencia a auto-organização da micela no seio da solução (Velegol et al, 2000 No presente caso, a adsorção do corante AL8 deve ocorrer principalmente por interação hidrofóbica envolvendo a partição das suas moléculas dentro do grupo -cauda‖ do surfactante adsorvido sobre a superfície da zeólita modificada. A 110 agregação das micelas quando HDTMA-Br é adsorvido sobre uma superfície sólida é maior do que com HDTMA-Cl resultando em maior cobertura por bicamada e consequentemente, maior capacidade de adsorção do adsorbato pelo mecanismo de partição.…”
Section: Influência Do Contra-íon Na Capacidade De Adsorçãounclassified