Вплив природи полімерів на структуроутворення високодисперсних оксидів
According to photon correlation spectroscopy data, nanoparticle aggregation in aqueous suspensions of highly disperse oxides depends on pH and ionic strength of the solution and on adsorption modification of the surface by polymers. It was shown that the adsorption of polyvinyl alcohol and polyvinyl...
Збережено в:
| Дата: | 2011 |
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| Автори: | , , , , , , |
| Формат: | Стаття |
| Мова: | Українська |
| Опубліковано: |
Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine
2011
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| Онлайн доступ: | https://surfacezbir.com.ua/index.php/surface/article/view/448 |
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| Назва журналу: | Surface |
| Завантажити файл: |  |
Репозитарії
Surface| Резюме: | According to photon correlation spectroscopy data, nanoparticle aggregation in aqueous suspensions of highly disperse oxides depends on pH and ionic strength of the solution and on adsorption modification of the surface by polymers. It was shown that the adsorption of polyvinyl alcohol and polyvinylpyrrolidone on silica surface caused an increase in the effective diameter of particles. The modification of silica surface with lecithin led to an increase in the size of aggregates in physiological solution from 48 to 74 nm. However, these sizes were considerably smaller than the sizes of lecithin vesicles at the same pH values. It testifies about the destruction of the primary structures of lecithin (vesicles) after the formation of monomolecular coverage on the oxide surfaces. The surface modification of silica with low molecular weight polymers (polyethylene glycol) had no significant effect on the aggregation process. |
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