A brief review of the relationships between monolayer viscosity, phase behavior, surface pressure, and temperature using a simple monolayer viscometer

Coralie Alonso, Joseph A. Zasadzinski

Research output: Contribution to journalReview article

14 Scopus citations

Abstract

The two-dimensional surface shear viscosity, η, of fatty acid monolayers of different chain lengths, measured using a simple magnetic needle viscometer, strongly correlates with the molecular organization in condensed phases and the absolute temperature. η can increase by orders of magnitude at phase boundaries associated with tilted to untilted molecular order, providing the underlying order is semicrystalline. Hence, untilted, long-range ordered CS phases are the most viscous films, However, despite being untilted, the LS rotator phase is less viscous than certain laterally ordered tilted phases, suggesting a decrease of the van der Waals interactions due to molecular rotation. In certain regions of the L2 phase, η reaches a maximum before the L2-LS transition, an anomalous behavior correlated with the change in the lattice symmetry of the headgroup. Surface shear viscosity, even when measured with a macroscopic probe, is particularly sensitive to the microscopic organization of monolayers.

Original languageEnglish (US)
Pages (from-to)22185-22191
Number of pages7
JournalJournal of Physical Chemistry B
Volume110
Issue number44
DOIs
StatePublished - Nov 9 2006
Externally publishedYes

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