ABSTRACT

Density () and speed of sound (u) of a cationic surfactant, DTAB (dodecyltrimethylammonium bromide) in aqueous solutions of tetraalkylammonium bromide, R4NBr (R= propyl, butyl, and pentyl) have been measured in the temperature range (293.15 318.15) K at an interval of 5 K. The temperature dependence of speed of sound has been used to compute the critical micelle concentration (CMC) and second critical micelle concentration (2nd CMC). Various volumetric and compressibility parameters have been evaluated in micellar and postmicellar regions to investigate the behavior of elongated micelles in comparison to the spherical ones. The trends of all these parameters have been examined in terms of a competing pattern of various intermolecular interactions existing in the ternary (tetraalkylammonium bromide + water + surfactant) system. The hydrophobic hydrophobic interactions show the predominance in the studied system, which is enhanced with the increase in the alkyl chain length of the bromide salt.

Compounds

#	Formula	Name
1	C12H28IN	tetrapropylammonium iodide
2	C16H36BrN	tetrabutylammonium bromide
3	C20H44BrN	tetrapentylammonium bromide
4	C15H34BrN	dodecyltrimethylammonium bromide
5	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	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid		Liquid	Sing-around technique in a fixed-path interferometer	1
POMD	4 5	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	91
POMD	4 5	Speed of sound, m/s ; Liquid	Molality, mol/kg - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	91
POMD	1 4 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 1; Liquid	Liquid	Vibrating tube method	72
POMD	1 4 5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 1; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	72
POMD	4 2 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 2; Liquid	Liquid	Vibrating tube method	72
POMD	4 2 5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 2; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	72
POMD	3 4 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 3; Liquid	Liquid	Vibrating tube method	72
POMD	3 4 5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Solvent: Molality, mol/kg - 3; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	72
POMD	1 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 1; Liquid	Liquid	Vibrating tube method	6
POMD	1 5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 1; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	6
POMD	2 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 2; Liquid	Liquid	Vibrating tube method	6
POMD	2 5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 2; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	6
POMD	3 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid	Vibrating tube method	6
POMD	3 5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	6

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

Volumetric Analysis of Structural Changes of Cationic Micelles in the Presence of Quaternary Ammonium Salts

Chauhan, S.[Suvarcha], Kaur, M.[Maninder], Rana, D. S.[Dilbag Singh], Chauhan, M. S.[Mohinder Singh]

ABSTRACT