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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hermida-Merino, Daniel Chaibundit, Chiraphon Costa, Flávia de M. L. L. Ricardo, Nágila M. P. S. Yeates, Stephen G. Ricardo, Nadja M. P. S. Portale, Giuseppe Muryn, Christopher A. Hamley, Ian W. Burattini, Stefano Nixon, S. Keith |
| Description | Country affiliation: Brazil Author Affiliation: Ricardo NM ( Department of Organic and Inorganic Chemistry, Federal University of Ceará, CX 12200 Fortaleza, Brazil. naricard@ufc.br) |
| Abstract | In dilute aqueous solution unimers of copolymer P123 (E(21)P(67)E(21)) associate to form micelles, and in more concentrated solution micelles pack to form high-modulus gels. We are interested in the use of the system as a templating agent in the synthesis of mesoporous materials, and the possibility of determining gel structure, hence mesoporosity, by use of n-, s- or t-butanol. Dynamic light scattering from clear dilute solutions has been used to confirm micellization, visual observation of mobility (tube inversion) to detect gel formation in concentrated solutions, oscillatory rheometry to confirm gel formation and provide values of elastic moduli over a wide temperature range, and small-angle X-ray scattering to determine gel structure. As expected, clear cubic gels (fcc) formed at moderate concentrations and temperatures, e.g. 30 wt.% P123, 20°C, and clear hexagonal gels at higher concentrations and temperatures. The transition on heating from cubic to hexagonal gel involved an intermediate turbid phase in which cubic and hex structures coexisted. Considering cubic gels of 35 wt.% P123 in 5 wt.% butanol/water, those in n-butanol/water had the lowest critical temperatures for gel formation and the highest maximum values for the dynamic elastic modulus (G') of the gels, a result consistent with n-butanol/water being the poorest solvent for P123. |
| ISSN | 00219797 |
| Issue Number | 2 |
| Journal | Journal of Colloid and Interface Science |
| Volume Number | 353 |
| e-ISSN | 10957103 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2011-01-15 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Colloid & Interface Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Colloid and Surface Chemistry Biomaterials Electronic, Optical and Magnetic Materials |
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