ABSTRACT

The micellization of six Gemini quaternary ammonium surfactants aqueous solutions has been investigated from measurements on specific conductivity as a function of surfactant concentration at different temperatures from (298.15 to 323.15) K. The micellization parameters such as the critical micellar concentration (CMC) and the degree of counterion dissociation (ss), Gibbs free energy (?Gmic), enthalpy (?Hmic), and entropy (?Smic) of micellization are then obtained. It is shown that the conductometry measurements provide agreement of the CMC values at 298.15 K with the surface tension studies. With the rise of temperature, the values of CMC and ss increase, while ?Gmic changes little. The linear plots of T?Smic versus ?Hmic show the effects of enthalpy entropy compensation. The length of alkyl chain and the spacer group of the Gemini surfactant have significant influences on micellization parameters.

Compounds

#	Formula	Name
1	C31H68Br2N2	N1,N3-didodecyl-N1,N1,N3,N3-tetramethylpropane-1,3-diaminium bromide
2	C32H70Br2N2	N1,N4-didodecyl-N1,N1,N4,N4-tetramethylbutane-1,4-diaminium bromide
3	C34H74Br2N2	N1,N6-didodecyl-N1,N1,N6,N6-tetramethylhexane-1,6-diaminium bromide
4	C35H76Br2N2	N1,N1,N3,N3-tetramethyl-N1,N3-ditetradecylpropane-1,3-diaminium bromide
5	C36H78Br2N2	N1,N1,N4,N4-tetramethyl-N1,N4-ditetradecylbutane-1,4-diaminium bromide
6	C38H82Br2N2	N,N,N',N'-tetramethyl-N,N'-ditetradecylhexane-1,6-diaminium bromide
7	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	7 1	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 1; Liquid	Temperature, K; Liquid	Liquid Gas	Pendant drop shape	14
POMD	7 1	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Mettler Toledo inLab 710	147
POMD	2 7	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 2; Liquid	Temperature, K; Liquid	Liquid Gas	Pendant drop shape	14
POMD	2 7	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Mettler Toledo inLab 710	130
POMD	7 3	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 3; Liquid	Temperature, K; Liquid	Liquid Gas	Pendant drop shape	14
POMD	7 3	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Mettler Toledo inLab 710	142
POMD	7 4	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 4; Liquid	Temperature, K; Liquid	Liquid Gas	Pendant drop shape	16
POMD	7 4	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Mettler Toledo inLab 710	119
POMD	7 5	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 5; Liquid	Temperature, K; Liquid	Liquid Gas	Pendant drop shape	16
POMD	7 5	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid	Liquid	Mettler Toledo inLab 710	118
POMD	7 6	Surface tension liquid-gas, N/m ; Liquid	Molality, mol/kg - 6; Liquid	Temperature, K; Liquid	Liquid Gas	Pendant drop shape	16
POMD	7 6	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid Molality, mol/kg - 6; Liquid	Pressure, kPa; Liquid	Liquid	Mettler Toledo inLab 710	121

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Micellization Parameters of Six Gemini Quaternary Ammonium Surfactants from Measurements of Conductivity and Surface Tension

Zhang, S.[Shanshan], Yu, J.[Jing], Wu, J.[Jianzhou], Tong, W.[Wei], Lei, Q.[Qunfang], Fang, W.[Wenjun]

ABSTRACT