Heat capacities and volumes of suspensions in the presence of surfactants

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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.
Lingua originaleEnglish
pagine (da-a)95-108
Numero di pagine14
RivistaThermochimica Acta
Volume418
Stato di pubblicazionePublished - 2004

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Surface-Active Agents
Specific heat
Suspensions
Surface active agents
surfactants
specific heat
Silicon Dioxide
Sodium
Silica
sodium
silicon dioxide
lauric acid
perfluorooctanoic acid
Hydrophobicity
hydrophobicity
Density (specific gravity)
sodium bromides
Water
destabilization
Ternary systems

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cita questo

@article{074f5c2b2e9c447989c6afc48cd17409,
title = "Heat capacities and volumes of suspensions in the presence of surfactants",
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.",
author = "Giuseppe Lazzara and {De Lisi}, Rosario and Nicola Muratore and Stefana Milioto",
year = "2004",
language = "English",
volume = "418",
pages = "95--108",
journal = "Thermochimica Acta",
issn = "0040-6031",
publisher = "Elsevier",

}

TY - JOUR

T1 - Heat capacities and volumes of suspensions in the presence of surfactants

AU - Lazzara, Giuseppe

AU - De Lisi, Rosario

AU - Muratore, Nicola

AU - Milioto, Stefana

PY - 2004

Y1 - 2004

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10447/22358

UR - https://www.sciencedirect.com/science/article/pii/S0040603104000425

M3 - Article

VL - 418

SP - 95

EP - 108

JO - Thermochimica Acta

JF - Thermochimica Acta

SN - 0040-6031

ER -