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Morphology of hybrid poly styrene-block-poly(ethylene oxide) micelles: Analytical ultracentrifugation and SANS studiesстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Bronstein L.M., Khotina I.A., Chernyshov D.M., Valetsky P.M., Timofeeva G.I., Dubrovina L.V., Stein B., Karlinsey R., Triolo A., Weidenmann A., Lo Celso F., Triolo R., Khokhlov A.R.
- Журнал: Journal of Colloid and Interface Science
- Том: 299
- Номер: 2
- Год издания: 2006
- Издательство: Academic Press
- Местоположение издательства: United States
- Первая страница: 944
- Последняя страница: 952
- DOI: 10.1016/j.jcis.2006.02.050
- Аннотация: Morphology and structure of aqueous block copolymer solutions based on polystyrene-block-poly(ethylene oxide) (PS-b-PEO) of two different compositions, a cationic surfactant, cetyl pyridinium chloride (CPC), and either platinic acid (H2PtCl6.6H(2)O) or Pt nanoparticles were studied using a combination of analytical ultracentrifugation (AUC), transmission electron microscopy (TEM), and small angle neutron scattering (SANS). These studies combining methods contributing supplemental and analogous structural information allowed us to comprehensively characterize the complex hybrid systems and to discover an isotope effect when H2O was replaced with D2O. In particular, TEM shows formation of both micelles and larger aggregates after incorporation of platinic acid, yet the amount of aggregates depends on the H2PtCl6.6H(2)O concentration. AUC reveals the presence of micelles and micellar clusters in the PS-b-PEO block copolymers solution and even larger (supermicellar) aggregates in hybrids (with CPC). Conversely, SANS applied to D2O solutions of the similar species indicates that micelles are spherical and no other micellar species are found in block copolymer solutions. To reconcile the SANS and AUC data, we carried out AUC examination of the corresponding D2O block copolymer solutions. These measurements demonstrate a pronounced isotope effect on micelle aggregation and micelle size, i.e., no micelle aggregation in D2O solutions, revealing good agreement of AUC and SANS data. (c) 2006 Elsevier Inc. All rights reserved.
- Добавил в систему: Хохлов Алексей Ремович