TY - JOUR
T1 - Surface tension properties of aqueous solutions of disulfur betaine derivatives
AU - Pinazo, A.
AU - Infante, M. R.
AU - Chang, C. H.
AU - Franses, E. I.
N1 - Funding Information:
Support from the Wool Foundation grant (U.K.) to A. Pinazo and M.-R. Infante, the National Science Foundation (#BCS 91-12154 and CTS 93-04328), and the Showalter trust is gratefully acknowledged. Dr. A. Pinazo thanks Tenneco Espafia for allowing her the use of their facilities.
PY - 1994/7/29
Y1 - 1994/7/29
N2 - The equilibrium and dynamic surface tensions of aqueous solutions of two newly synthesized surfactants relevant to wool dyeing were studied by means of the Wilhelmy plate and a bubble method. The surfactants (Nα,Nα′-bis(N-dodecyl-N,N-dimethylglycine cystine dimethyl ester dihydrochloride) and (Nα,Nα′-bis(N-dodecyl-N,N-dimethylglycine) cystamine dihydrochloride), are double-chain and bicationic in character. Their CMCs and Langmuir adsorption equilibrium parameters were determined at 25°C. Both molecules are very efficient surfactants. Their surface tensions equilibrate in time-scales ranging from seconds to hours (concentration c=1000-2 μM). Their dynamic surface tensions under constant and pulsating area conditions indicate that there is a strong barrier to adsorption at the air-water interface. The presence of the micelles accelerates the net rate of adsorption, suggesting fast micellar dissociation.
AB - The equilibrium and dynamic surface tensions of aqueous solutions of two newly synthesized surfactants relevant to wool dyeing were studied by means of the Wilhelmy plate and a bubble method. The surfactants (Nα,Nα′-bis(N-dodecyl-N,N-dimethylglycine cystine dimethyl ester dihydrochloride) and (Nα,Nα′-bis(N-dodecyl-N,N-dimethylglycine) cystamine dihydrochloride), are double-chain and bicationic in character. Their CMCs and Langmuir adsorption equilibrium parameters were determined at 25°C. Both molecules are very efficient surfactants. Their surface tensions equilibrate in time-scales ranging from seconds to hours (concentration c=1000-2 μM). Their dynamic surface tensions under constant and pulsating area conditions indicate that there is a strong barrier to adsorption at the air-water interface. The presence of the micelles accelerates the net rate of adsorption, suggesting fast micellar dissociation.
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U2 - 10.1016/0927-7757(94)02772-2
DO - 10.1016/0927-7757(94)02772-2
M3 - Article
AN - SCOPUS:0011751401
SN - 0927-7757
VL - 87
SP - 117
EP - 123
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 2
ER -