Nagy, Miklós and Siegl, Zoltán and Szili, Krisztina and Fábos, Viktória and Kántor, Krisztina (2016) Sorbent Mass Variation Method: A New Possibility for the Determination of Binding Isotherms. LANGMUIR, 32 (25). pp. 6409-6418. ISSN 0743-7463
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Abstract
Measurement of equilibrium mass fraction of a surfactant as a function of the sorbent mass fraction was performed on gel sorbent-solution systems in order to determine binding isotherms and to calculate fundamental characteristics of the solvation layer. With application of this new method, it was possible to calculate specific solvation/sorption capacity and absolute average local composition of the solvation layer. It has been pointed out by systematic variation of the composition (hydrophobicity) and degree of cross-linking of the gel sorbents that the ratio of components in the solvation layer can be constant in a given range of equilibrium mass fraction of the sodium dodecyl sulfate (SDS) and that the specific solvation/sorption capacity of gel sorbents can be much greater than that of activated carbon type adsorbents. On the basis of a mixed sorbent model, it turned out from calculations that there is no preferential binding of SDS close to the chemical cross-links and that the surfactant molecules prefer vinyl acetate groups as binding sites. The density of cross-links regulates the aggregation number of the bound surfactant as well. For loose gels, both binding isotherms and swelling curves show that the surfactant-polymer interaction is a strongly cooperative process. The result of these experiments may influence the general concept of solvation/sorption isotherms and all related phenomena.
Item Type: | Article |
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Subjects: | Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia Q Science / természettudomány > QD Chemistry / kémia > QD04 Organic chemistry / szerves kémia |
SWORD Depositor: | MTMT SWORD |
Depositing User: | MTMT SWORD |
Date Deposited: | 07 Jul 2016 14:25 |
Last Modified: | 05 Jun 2017 23:15 |
URI: | http://real.mtak.hu/id/eprint/37513 |
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