TY - JOUR
T1 - Surface tension measurements with the pulsating bubble method
AU - Chang, Chien-Hsiang
AU - Coltharp, Karen A.
AU - Park, Sun Young
AU - Franses, Elias I.
PY - 1996/8/20
Y1 - 1996/8/20
N2 - The bubble method for determining equilibrium and dynamic surface tensions from the measured pressure difference across the air/water interface is described. Data for either constant surface area or pulsating area conditions are presented for three sets of systems. For dipalmitoylphosphatidylcholine (DPPC)-hexadecanol dispersions in saline at 37°C, the dynamic tension depends strongly on the protocol of dispersion preparation. The two surfactants show strong synergistic effects in lowering tension. For aqueous salts of fatty acid soaps (carbon number n = 8-18) at 37°C in saline/buffer, the surface activity increases (tension is lower and equilibration time is shorter) up to n = 12, and then decreases for n ≤ 14, as these soaps are less soluble. For aqueous sodium dodecylsulfate (SDS) and octanol in water at 25°C, the dynamic tension depends on the total concentration, on the molar ratio, as expected, and on the pulsation period relative to the timescale for tension equilibration. The results are relevant in the formulation of surfactant mixtures for cleaning products, foaming, and lung surfactant replacement drugs.
AB - The bubble method for determining equilibrium and dynamic surface tensions from the measured pressure difference across the air/water interface is described. Data for either constant surface area or pulsating area conditions are presented for three sets of systems. For dipalmitoylphosphatidylcholine (DPPC)-hexadecanol dispersions in saline at 37°C, the dynamic tension depends strongly on the protocol of dispersion preparation. The two surfactants show strong synergistic effects in lowering tension. For aqueous salts of fatty acid soaps (carbon number n = 8-18) at 37°C in saline/buffer, the surface activity increases (tension is lower and equilibration time is shorter) up to n = 12, and then decreases for n ≤ 14, as these soaps are less soluble. For aqueous sodium dodecylsulfate (SDS) and octanol in water at 25°C, the dynamic tension depends on the total concentration, on the molar ratio, as expected, and on the pulsation period relative to the timescale for tension equilibration. The results are relevant in the formulation of surfactant mixtures for cleaning products, foaming, and lung surfactant replacement drugs.
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U2 - 10.1016/0927-7757(96)03531-5
DO - 10.1016/0927-7757(96)03531-5
M3 - Conference article
AN - SCOPUS:0342502134
SN - 0927-7757
VL - 114
SP - 185
EP - 197
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
T2 - Proceedings of the 1995 Workshop on Bubble and Drop
Y2 - 1 May 1995 through 1 May 1995
ER -