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Relationship between Surface Tension and Surface Coverage
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DOI：10.1021/la203009m.png)
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Abstract
En 中文
Surfactant action is caused in part by a dramatic reduction in surface tension. Using surface excess measurements from a radioactive surfactant, it was possible to show that (a) the surface tension declines only slightly when the occupancy of the air/water interface increases from 0 to 60% of the maximum and (b) the steep drop in surface tension in region B (Figure 1), frequently observed to be linear, begins at about 80% occupancy. Surfactant continues to enter the interface cooperatively up to and past the critical micelle concentration. Linearity in region B is not indicative of surface saturation despite a seemingly constant surface excess throughout the region. The disparity between interfacial areas determined by surface tension and by other methods is discussed in terms of these results.
Keywords:
SODIUM DODECYL-SULFATE
AIR-WATER-INTERFACE
GIBBS ANALYSIS
GEMINI SURFACTANTS
NEUTRON REFLECTIVITY
AIR/WATER INTERFACE
ADSORPTION
POLYMERIZATION
AGGREGATION
EXCESS