A NONLEAK TROUGH FOR MONOLAYERS AT THE AIR WATER INTERFACE/

Citation
R. Qiu et Rc. Macdonald, A NONLEAK TROUGH FOR MONOLAYERS AT THE AIR WATER INTERFACE/, Review of scientific instruments, 65(2), 1994, pp. 500-502
Citations number
6
Categorie Soggetti
Physics, Applied","Instument & Instrumentation
ISSN journal
00346748
Volume
65
Issue
2
Year of publication
1994
Pages
500 - 502
Database
ISI
SICI code
0034-6748(1994)65:2<500:ANTFMA>2.0.ZU;2-H
Abstract
The problem of barrier leakage in surface pressure-surface area measur ements has been overcome with a trough wherein the sample is compresse d inside a band of teflon-covered spring steel strip. A computer-contr olled stepping motor drive applies force to one side of the band, defo rming it from a rounded triangle to a ''v'' shape. The compression ran ge extends up to 4:1 and is repeatable to +/-2%. Calibration is conven iently and accurately done with a computer-interfaced video imaging an d analysis system. The design greatly simplifies the construction of s urface troughs and completely obviates the possibility of leakage at h igh surface pressures. The trough is useful for investigations involvi ng high surface pressures and/or requiring long times.