El-Bayaa, A. A. and Al-Amir, Asmaa (2017) INFLUENCE OF PH AND TEMPERATURE ON SURFACE-ACTIVE PROPERTIES OF SOME HUMIC ACIDS. Al-Azhar Bulletin of Science, 28 (2). pp. 17-26. ISSN 1110-2535
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Abstract
In this study, surface tension measurements were used to study the surface-active properties of olive humic acid (HAO) and commercial humic acid (HA2). The study was performed under different conditions of concentration, temperature, pH and time. The measurements showed that the amphiphilic character of the humic acids solutes at the air/water interface lowers the surface tension () of the solution with an increasing concentrations and temperatures. The critical micelle concentration (CMC) values of both humic acids decreased with an increase in the temperature. Positive values of ∆So and ∆Ho suggested that, their adsorption at air/water interface, is endothermic and entropy driven. The surface tension–pH curve featured a minimum for both humic solutions, declining from higher and lower pH values.
Item Type: | Article |
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Subjects: | Open Research Librarians > Medical Science |
Depositing User: | Unnamed user with email support@open.researchlibrarians.com |
Date Deposited: | 11 Oct 2023 05:37 |
Last Modified: | 11 Oct 2023 05:37 |
URI: | http://stm.e4journal.com/id/eprint/1490 |