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The concept of gel diffusion in the kinetics of swelling and shrinking of polystyrene sulfonic acid ion exchanger in the K+ formстатья
Статья опубликована в журнале из списка RSCI Web of Science
Статья опубликована в журнале из перечня ВАКСтатья опубликована в журнале из списка Web of Science и/или Scopus
- Авторы: Gavlina O.T., Kargov S.I., Ivanov V.A.
- Журнал: Сорбционные и хроматографические процессы
- Том: 21
- Номер: 6
- Год издания: 2021
- Издательство: ВГУ
- Местоположение издательства: Воронеж
- Первая страница: 794
- Последняя страница: 804
- Аннотация: The kinetics of swelling and shrinking of polystyrene resins of the sulfonic acid type was investigated. The bead of the ion exchanger in the K+ form, equilibrated with 0.1 M, 0.5 M, 1.0 M or 2 M KCl solution was placed into water and its diameter was measured continuously. In the reverse experiments, the bead, which came into equilibrium with water, was transferred to KCl solutions and the kinetics of grain shrinking was studied analogously. The experimental data were processed by using the theory of "gel diffusion", the parameter of which is the so-called gel diffusion coefficient, similar to the molecular diffusion coefficient. In contrast to previously published works, in which only the first term of the series in the corresponding equation was taken into account, in our work the first ten members of the series were taken into account. It turned out that it is necessary to take into account not only the first member of the series (as was done in previously published works), but also the second member of the series. It also turned out that the values of the so obtained gel diffusion coefficient quite logically increase somewhat during the process of swelling (for example, in experiments with 1 M KCl from 2.1×10−6 to 3.0×10−6 cm2/s) and decrease somewhat during the process of shrinking. It is shown that the average values of the diffusion coefficients of the gel make it possible to adequately describe the main part of the kinetic curve. The concept of gel diffusion allows one to compare the swelling kinetics of various polyelectrolyte gels in terms of diffusion coefficients, regardless of the particle shape, systematize data for various materials, and compare their properties with the molecular diffusion of other substances.It also turned out that in the very final parts (5–10%) of the kinetic curves a sharp decrease in the diffusion coefficient value is observed both in experiments with swelling and shrinking of grains. It indicates that at the final stages there is a sharp deceleration of the process due to a change in its mechanism.
- Добавил в систему: Иванов Владимир Александрович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | 01Gavlina.pdf | 01Gavlina.pdf | 531,9 КБ | 25 января 2022 [IvanovVA] | |
| 2. | Gavlina_diffuziya2021.pdf | Gavlina_diffuziya2021.pdf | 533,6 КБ | 25 февраля 2022 [IvanovVA] |