SURFACE ACTIVITY OF FLUORINATED ORGANIC COMPOUNDS AT ORGANIC-LIQUID/AIR INTERFACES. PART II. SURFACE TENSION VS. CONCENTRATION CURVES, ADSORPTION ISOTHERMS, AND FORCE-AREA ISOTHERMS FOR PARTIALLY FLUORINATED CARBOXYLIC ESTERS
This investigation was undertaken to study the ability of a series of partially fluorinated carboxylic esters to depress the surface tension of a group of pure organic liquids. The surface activity of these solutes in the different solvents was shown to vary with the hydrocarbon content, fluorocarbon content, and the number and position of associating groups in the solute. The balance between these organophilic and organophobic groups in the solute molecules which gave maximum surface tension depression varied with the surface tension of the solvent and the solubility of the solute in it. In this report surface tension vs. concentration curves, adsorption vs. concentration isotherms, and graphs of monolayer film pressure vs. area per molecule of adsorbed solute are given for each fluorochemical in the various organic solvents. Theoretical calculations from these data give the extent of adsorption and explain the orientation and packing of the molecules adsorbed at the interface of liquid and air. A discussion is given of the effect of the organophobic and organophilic constituents of the solute molecules on the extent of adsorption and on the tendency to associate with the various solvents. (auth)
- Research Organization:
- Naval Research Lab., Washington, D.C.
- NSA Number:
- NSA-14-001444
- OSTI ID:
- 4215413
- Report Number(s):
- NRL-5364; Project NR 472-000
- Resource Relation:
- Other Information: Project NR 472-000; Part I issued as NRL-5244. Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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