NDLI: Determining concentration depth profiles of thin foam films with neutral impact collision ion scattering spectroscopy.

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Determining concentration depth profiles of thin foam films with neutral impact collision ion scattering spectroscopy.

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Determining concentration depth profiles of thin foam films with neutral impact collision ion scattering spectroscopy.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ridings, Christiaan Andersson, Gunther G.
Description	Country affiliation: Australia Author Affiliation: Ridings C ( School of Chemical and Physical Sciences, Flinders University, Adelaide, SA 5001, Australia.)
Abstract	Equipment is developed to measure the concentration depth profiles in foam films with the vacuum based technique neutral impact collision ion scattering spectroscopy. Thin foam films have not previously been investigated using vacuum based techniques, hence specialized methods and equipment have been developed for generating and equilibrating of foam films under vacuum. A specialized film holder has been developed that encloses the foam film in a pressure cell. The pressure cell is air-tight except for apertures that allow for the entrance and exit of the ion beam to facilitate the analysis with the ion scattering technique. The cell is supplied with a reservoir of solvent which evaporates upon evacuating the main chamber. This causes the cell to be maintained at the vapor pressure of the solvent, thus minimizing further evaporation from the films. In order to investigate the effect of varying the pressure over the films, a hydrostatic pressure is applied to the foam films. Concentration depth profiles of the elements in a thin foam film made from a solution of glycerol and the cationic surfactant hexadecyltrimethylammonium bromide (C(16)TAB) were measured. The measured concentration depth profiles are used to compare the charge distribution in foam films with the charge distribution at the surface of a bulk solution. A greater charge separation was observed at the films' surface compared to the bulk surface, which implies a greater electrostatic force contribution to the stabilization of thin foam films.
ISSN	00346748
Issue Number	11
Journal	Review of Scientific Instruments
Volume Number	81
e-ISSN	10897623
Language	English
Publisher	American Institute of Physics
Publisher Date	2010-11-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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