Abstract
Entropies of compression calculated from surface pressure-area isotherms for anionic or cationic monolayers of the same chain length (18 carbons) that are spread at n-heptane/water (O/W) or air/water (A/W) interfaces or for their equimolar mixture at the O/W interface are negative. When plotted against the logarithm of the area they give two lines - one for the A/W interface and a steeper one for the O/W interface. As well as being independent of head group, the entropies do not depend on ionic strength. A model that treats the monolayer as an ensemble of discs that interact only through hard sphere and coulombic forces explains the size of the entropies at A/W but not at O/W where an extra chain-conformation term is needed.
Original language | English (US) |
---|---|
Pages | 14-27 |
Number of pages | 14 |
State | Published - 1974 |
Event | for Mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc - Atlantic City, NJ Duration: Sep 11 1974 → Sep 13 1974 |
Conference
Conference | for Mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc |
---|---|
City | Atlantic City, NJ |
Period | 9/11/74 → 9/13/74 |
All Science Journal Classification (ASJC) codes
- General Chemistry