ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The surface pressure measured with the Wilhelmy method may vary considerably with the experimental conditions adopted for isotherms of nonamphiphilic, macromolecular substances, in contrast to the majority of traditional amphiphilic compounds such as fatty acids. This is demonstrated here by analyzing monolayer characteristics of lignins, for which a variety of conditions were employed, including change in the mode of compression, positioning of the Wilhelmy plate, and compression speeds. A minimum in the decompression leg of a hysteresis experiment was found to arise from experimental artifacts, which are explained in terms of the various forces experienced by the Wilhelmy plate. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1149949
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