A new interfacial film balance is described. The instrument permits rigorous cleaning of the interface and compression of a spread monolayer. Film pressure/area relations for spread monolayers of sodium octadecyl sulphate, octadecyl and docosyl trimethylammonium bromides and an equimolecular mixture of sodium octadecyl sulphate and octadecyl trimethylammonium bromide are given for the interface between n-heptane and aqueous NaCl solutions at 20°C. The phase transition observed in the mixed monolayers is accounted for in terms of a simple discrete-charge model.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry