Interface alumina/water

Somasundaran, P and D. W. Fuerstenau (1966), "Mechanisms of Alkyl Sulfonate Adsorption at the Alumina-Water Interface", J. of Physical ChemistrylQ, 90-96. 

A well-studied and often-cited adsorption isotherm of an ionic surfactant is that of sodium dodecylsulfate at the alumina-water interface at pH 6.5 and 0.1 M NaCl. At pH 6.5 and 0.1 M NaCl the S-F isotherm [23]... 

Fig. 37 Adsorption isotherm of TTAC at alumina-water interface at pH 10, ionic strength 0.03 M NaCl...

Chandar, P., P. Somasundaran, and N. J. Turro, Fluorescent probe studies on the structure of the absorbed layer of dodecyl sulfate at the alumina-water interface , J. Colloid Int. Sci., 117, 31-46 (1987). 

Fuerstenau, D. W., and T. Wakamatsu, Effect of pH on the adsorption of sodium dodecanesulphonate at the alumina/water interface , Faraday Disc. Chem. Soc., 59,157-168 (1975). 

It has already been established (10) that alkylsulfonate ions adsorb at the positively charged alumina-water interface as counterions in the electrical double layer. Chemisorption is absent. The electrical double... 

Somasundaran, P. and Furstenau, D.W., Mechanisms of alkyl sulfonate adsorption at the alumina-water interface, J. Phys. Chem., 70, 91, 1966. 

Giles, C.H. and Nakhwa, S.N. (1962). Adsorption XVI The measurement of specific surface areas of finely divided solids by solution adsorption. J. Appl. Chem., 12, 266-73. Lopez-Gonzalez, J., de, D., Valenzuela-Calahorro, C., et al. (1988). Adsorption of p-nitrophenol by active carbons prepared from obve wood. An. Quim., 84B, 47—51. Femandez-Cobnas, J., Denoyel, R., and Rouquerol, J. (1991). Characterization of activated charcoals by adsorption from solution. Stud. Surf. Sci. Catal., 62, 399—408. Somasundaran, P. and Fuerstenau, D.W. (1966). Mechanisms of alkyl sulfonate adsorption at the alumina-water interface. J. Phys. Chem., 70, 90-6. 

Laiti. E., Persson, P., and Ohman, L.O., Balance between surface complexation and siii facc phase transformation at the alumina/water interface, Lcmgmuir. 14, 825, 1998. 

Santhiya, D. et al., Effect of polymer molecular weight on the adsorption of polyacrylic acid at the alumina-water interface, Colloids Sutf. A, 133. 157. 1998. 

Jiang, L., Gao, L., and Liu, Y, Adsorption of salicylic acid, 5-sulfosalicylic acid and Tiron at the alumina-water interface. Colloids Surf. A, 211, 165. 2002. 

Wang, W. and Kwak, J.C.T., Adsorption at the alumina-water interface from mixed surfactant solutions. Colloids Surf. A, 156, 95, 1999. 

Monticone, V. et al.. Effect of pH on the coadsorption of weak acids to silica/water and weak bases to alumina/water interfaces as induced by ionic surfactants, Langmuir, 16, 258, 2000. 

Huang L., Shrotri S., and Somasundaran P, Desorption behavior of surfactant mixtures at the alumina-water interface, J. Colloid Interf. Sci., 192, 179, 1997. 

More recently, an interesting technique has been used by Clark and Ducker [70] to measure kinetics, in the form of attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. They found that total surface exchange of a cationic ammonium bromide surfactant on a silica surface occurred in slightly less than 10 s (fig. 19.6). This technique had been used previously by Couzis and Gulari [71, 72] to look at the adsorption kinetics of anionic surfactants at the alumina-water interface with apparent timescales in the region of tens of hours. 

Pyrene and dinaphthylpropane (DNP) fluorescence and nitroxide ESR probes have been successfully used to investigate the structure of the adsorbed layer of sodium dodecyl sulfate at the alumina-water interface [11,12], The fluorescence fine structure of pyrene yielded information on the polarity of the microenvironment in the adsorbed layer. Intramolecular excimer formation of DNP was used to measure the microfiuidity of this environment. The results indicate the presence of highly organized surfactant aggregates at the solid-liquid interface, formed by the association of hydrocarbon chains. 

The enhancement of the PVP adsorbed amount at the alumina-water interface, due to its interaction with an anionic surfactant, depends on the nature of the surfactant, as has been pointed out by Esumi et al. [50]. They studied the adsorption behavior on alumina of a system composed of PVP and a double-chained anionic surfactant, sodium bis(2-ethylhexyl)sulfosuccinate (Aerosol OT). In an aqueous solution. Aerosol OT interacts with PVP as shown by surface-tension measmements which evidence the two typical Q and Ca concentrations [18] (Fig. 13). Ci at 2 mmol/L is the same as for the PVP-SDS system or the PVP-LiDS pair. Ca of the SDS-PVP system is approximately two times that of the Aerosol OT-PVP pair (i.e., around 2.3 mmol/L and 1.3 mmol/L, respectively). 

Adsolubilization of 2-naphtol at the alumina-water interface using the PVP-SDS (From Ref. 46.)... 

Solubilization in polymer-surfactant aggregates adsorbed at the solid—liquid interface has been recently presented by Esumi et al. as a promising tool in wastewater treatment research [46]. Their study concerns the adsolubilization of 2-naphtol into PVP-anionic surfactants adsorbed at the alumina-water interface. Two surfactants were used SDS and Aerosol OT. 

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