دورية أكاديمية
Effect of pH and salt on the stiffness of polyelectrolyte multilayer microcapsules.
| العنوان: | Effect of pH and salt on the stiffness of polyelectrolyte multilayer microcapsules. |
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| المؤلفون: | Lulevich VV; Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany., Vinogradova OI |
| المصدر: | Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2004 Mar 30; Vol. 20 (7), pp. 2874-8. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: American Chemical Society Country of Publication: United States NLM ID: 9882736 Publication Model: Print Cited Medium: Print ISSN: 0743-7463 (Print) Linking ISSN: 07437463 NLM ISO Abbreviation: Langmuir Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: Washington, DC : American Chemical Society, c1985- |
| مواضيع طبية MeSH: | Capsules/*chemistry , Electrolytes/*chemistry , Polymers/*chemistry , Sodium Chloride/*chemistry, Hydrogen-Ion Concentration ; Microscopy, Atomic Force ; Microscopy, Confocal ; Microspheres ; Surface Properties |
| مستخلص: | By using a combination of atomic force and confocal microscopy, we explore the effect of pH and salt on the stiffness of polyelectrolyte microcapsules with shells composed of strong polyanions and weak polycations. The stiffness of the capsules was found to be largest in water. It decreases slightly with added salt and gets much smaller both in acidic and in alkaline solutions. The moderate softening of the capsules in electrolyte solutions indicates that even high salt concentration does not significantly dissociate polyelectrolytes in the multilayer. The dramatic softening of the capsules at high pH probably reflects a decrease in the charge density of a polycation, which leads to a reduction in the number of ionic cross-links. In contrast, low stiffness of the capsules in acidic solutions seems to be connected mostly with the enhanced permeability of the multilayer shell. |
| المشرفين على المادة: | 0 (Capsules) 0 (Electrolytes) 0 (Polymers) 451W47IQ8X (Sodium Chloride) |
| تواريخ الأحداث: | Date Created: 20050420 Date Completed: 20050620 Latest Revision: 20191026 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1021/la049934h |
| PMID: | 15835166 |
| قاعدة البيانات: | MEDLINE |
Find this issue from the American Chemical Society | تدمد: | 0743-7463 |
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| DOI: | 10.1021/la049934h |