Hysteresis of Isotherms of Mixed Monolayers of N-Octadecyl-N′-phenylthiourea and Stearic Acid at AirWater Interface
Joint Authors
Sudheesh, Siji
Ahmad, Jamil
Singh, Girija S.
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-12-19
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
Surface pressure area isotherms of Langmuir monolayers formed by spreading mixed solutions of varying concentrations of N-octadecyl-N′-phenylthiourea (OPT) and octadecanoic acid or stearic acid (SA) over air-water interface are described.
Examination of the hysteresis behavior and an analysis of the limiting area per molecule of the isotherms show that when the spread solution has an excess of OPT, the limiting surface area is consistent with a monolayer composed of equimolar amounts of the two components.
This indicates that any excess thiourea, which on its own does not form a stable monolayer, is squeezed out and is not part of the monolayer.
On the other hand, when the spreading mixture has an excess of SA over OPT, the isotherm indicates that the entire originally spread material is incorporated into the surface film.
In this case, the values of area/molecule indicate that the monolayer is composed of SA : OPT complex with a ratio of 1 : 1 together with the excess SA remaining in the monolayer.
American Psychological Association (APA)
Sudheesh, Siji& Ahmad, Jamil& Singh, Girija S.. 2012. Hysteresis of Isotherms of Mixed Monolayers of N-Octadecyl-N′-phenylthiourea and Stearic Acid at AirWater Interface. ISRN Physical Chemistry،Vol. 2012, no. 2012, pp.1-6.
https://search.emarefa.net/detail/BIM-501924
Modern Language Association (MLA)
Sudheesh, Siji…[et al.]. Hysteresis of Isotherms of Mixed Monolayers of N-Octadecyl-N′-phenylthiourea and Stearic Acid at AirWater Interface. ISRN Physical Chemistry No. 2012 (2012), pp.1-6.
https://search.emarefa.net/detail/BIM-501924
American Medical Association (AMA)
Sudheesh, Siji& Ahmad, Jamil& Singh, Girija S.. Hysteresis of Isotherms of Mixed Monolayers of N-Octadecyl-N′-phenylthiourea and Stearic Acid at AirWater Interface. ISRN Physical Chemistry. 2012. Vol. 2012, no. 2012, pp.1-6.
https://search.emarefa.net/detail/BIM-501924
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-501924