| Autor: |
Nordskog A; TU Berlin, Stranski-Laboratorium f. Physikalische und Theoretische Chemie, Strasse des 17.Juni 112, D-10623 Berlin, Germany., Egger H, Findenegg GH, Hellweg T, Schlaad H, Von Berlepsch H, Böttcher C |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review. E, Statistical, nonlinear, and soft matter physics [Phys Rev E Stat Nonlin Soft Matter Phys] 2003 Jul; Vol. 68 (1 Pt 1), pp. 011406. Date of Electronic Publication: 2003 Jul 24. |
| DOI: |
10.1103/PhysRevE.68.011406 |
| Abstrakt: |
Micelles of the diblock copolymer poly(butadiene)-poly(ethyleneoxide) (B40-b-EO62) and mixed micelles of this polymer with the cationic surfactant dodecyltrimethylammonium bromide (C12TAB) were investigated using static and dynamic light scattering and small-angle neutron scattering. It is shown that the surfactant induces a major structural change from large mainly rodlike aggregates to smaller spherical mixed micelles. The rodlike assemblies found in the absence of surfactant have a contour length L of ca. 500 nm and a diameter d approximately 30 nm. The spherical mixed micelles obtained upon addition of C12TAB possess a hydrodynamic radius of 15 nm and still contain several polymer molecules. The results of the scattering experiments are consistent with observations of the aggregates by cryogenic transmission electron microscopy. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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