Surface behaviour of some phenol para-derivatives adsorbed at the free surface of water |
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| Institution: | 1. Jagiellonian University, Faculty of Chemistry, Department of General Chemistry, Kraków, Poland;2. Medical Academy, Faculty of Pharmacy, Department of Physical Chemistry, Kraków, Poland;1. Ilse Katz Institute for Nanoscale Science and Technology, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel;2. Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel;3. Avram and Stella Goldstein-Goren Department of Biotechnology Engineering, Ben Gurion University of the Negev, Beer Sheva 8410501, Israel;1. Ankara University, Biotechnology Institute, Ankara, Turkey;2. Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran;3. Department of Biology and Biochemistry, University of Bath, Bath, United Kingdom;1. Department of Neurology, Chang Gung University College of Medicine, Chang Gung Memorial Hospital, Chiayi Branch, Chiayi, Taiwan;2. Department of Neurology, Chang Gung University College of Medicine, Chang Gung Memorial Hospital, Keelung Branch, Keelung, Taiwan;3. Department of Neurology, University of California, San Francisco, San Francisco, CA, USA |
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| Abstract: | Comparison is made between two methods for the determination of the average orientation angle of molecules adsorbed at the free surface of water; one based on electric surface potential measurements, the other on second harmonic generation. Assuming that the model of energetics of adsorbed molecules is similar to that of a system of non-interacting permanent dipoles in an external homogeneous field, the parameters of the probability density function in the form exp —a cos(0-0o)], a =w/kT, w, being the absolute orientational energy, have been calculated for phenol, p-methyl-, p-nitro-, and p-bromophenol. |
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