TY - JOUR
T1 - Micellar properties of some surface active mixed copper(II) chelates
AU - Lim, Y. Y.
AU - Tan, Eric H.L.
N1 - Funding Information:
The authors wish to thank the IRPA R&D Grant Committeeo f the Ministry of Sciencea nd EnvironmenMt, alaysiaf or financiasl upportT. hey
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1996/1/22
Y1 - 1996/1/22
N2 - Micellar properties of surface active mixed copper(II) chelates, [Cu(R-tmed)(acac)X] (where R-tmed = N,N,N'trimethyl-N'-alkylethylenediamine, R = C12H25 to C16H33, acac = acetylacetonate and X = Cl, Br) and [Cu(C16-dmed)(acac)Cl] (where C16-dmed = N,N'-dimethyl-N-cetylethylenediamine) were investigated by surface tensiometry, conductivity, viscosity and light scattering studies. In aqueous solution, they have a large negative standard free energy of adsorption at the air/water interface and a negative standard free energy of micellization. The degree of dissociation of the halide ions from the positively charged micelles falls in the range 0.22-0.29, with the [Cu(C12-tmed)(acac)Cl] micelle having the largest degree in the series studied. Viscosity and light scattering experiments suggest that the shape of the [Cu(C12-tmed)(acac)Cl] micelle is a sphere and that of its C16 analogue is an ellipsoid.
AB - Micellar properties of surface active mixed copper(II) chelates, [Cu(R-tmed)(acac)X] (where R-tmed = N,N,N'trimethyl-N'-alkylethylenediamine, R = C12H25 to C16H33, acac = acetylacetonate and X = Cl, Br) and [Cu(C16-dmed)(acac)Cl] (where C16-dmed = N,N'-dimethyl-N-cetylethylenediamine) were investigated by surface tensiometry, conductivity, viscosity and light scattering studies. In aqueous solution, they have a large negative standard free energy of adsorption at the air/water interface and a negative standard free energy of micellization. The degree of dissociation of the halide ions from the positively charged micelles falls in the range 0.22-0.29, with the [Cu(C12-tmed)(acac)Cl] micelle having the largest degree in the series studied. Viscosity and light scattering experiments suggest that the shape of the [Cu(C12-tmed)(acac)Cl] micelle is a sphere and that of its C16 analogue is an ellipsoid.
KW - aggregation number
KW - copper(II) mixed chelate micelles
KW - degree of dissociation
KW - micellization
KW - surface properties
UR - http://www.scopus.com/inward/record.url?scp=0030004916&partnerID=8YFLogxK
U2 - 10.1016/0927-7757(95)03387-4
DO - 10.1016/0927-7757(95)03387-4
M3 - Article
AN - SCOPUS:0030004916
VL - 106
SP - 167
EP - 173
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
IS - 2-3
ER -