Density and heat capacity measurements of water–surfactant–silica ternary systems were carried out as functions of the silica and the surfactant concentrations at 298 K. From these properties, the apparent molar volume and heat capacity of the surfactant in a given water+silica mixture were evaluated. As well, the apparent specific volume and heat capacity of silica, at a given concentration, in the water+surfactant mixtures as functions of the surfactant concentration were calculated. Some surfactants (decyltrimethylammonium bromide, sodium octanoate, sodium decanoate, sodium dodecanoate, sodium decylsulfate, sodium perfluorooctanoate and N,N-dimethyldodecylamine-N-oxide) were chosen to study the effect of the head-group and the hydrophobicity. As a general feature, the hydrophobicity of the surfactant does not essentially play a role on the silica–surfactant interactions whereas the surfactant head-group does. Finally, the apparent specific properties of silica are very sensitive in detecting the destabilization of suspensions whereas the apparent molar properties of the surfactant are not.

DE LISI R, G LAZZARA, S MILIOTO, & N MURATORE (2004). Heat capacities and volumes of suspensions in the presence of surfactants. THERMOCHIMICA ACTA, 418(1-2), 95-108 [10.1016/j.tca.2003.11.046].

Heat capacities and volumes of suspensions in the presence of surfactants

DE LISI, Rosario;LAZZARA, Giuseppe;MILIOTO, Stefana;MURATORE, Nicola
2004

Abstract

Density and heat capacity measurements of water–surfactant–silica ternary systems were carried out as functions of the silica and the surfactant concentrations at 298 K. From these properties, the apparent molar volume and heat capacity of the surfactant in a given water+silica mixture were evaluated. As well, the apparent specific volume and heat capacity of silica, at a given concentration, in the water+surfactant mixtures as functions of the surfactant concentration were calculated. Some surfactants (decyltrimethylammonium bromide, sodium octanoate, sodium decanoate, sodium dodecanoate, sodium decylsulfate, sodium perfluorooctanoate and N,N-dimethyldodecylamine-N-oxide) were chosen to study the effect of the head-group and the hydrophobicity. As a general feature, the hydrophobicity of the surfactant does not essentially play a role on the silica–surfactant interactions whereas the surfactant head-group does. Finally, the apparent specific properties of silica are very sensitive in detecting the destabilization of suspensions whereas the apparent molar properties of the surfactant are not.
https://www.sciencedirect.com/science/article/pii/S0040603104000425
DE LISI R, G LAZZARA, S MILIOTO, & N MURATORE (2004). Heat capacities and volumes of suspensions in the presence of surfactants. THERMOCHIMICA ACTA, 418(1-2), 95-108 [10.1016/j.tca.2003.11.046].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/22358
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