This title appears in the Scientific Report :
2000
Please use the identifier:
http://hdl.handle.net/2128/852 in citations.
Please use the identifier: http://dx.doi.org/10.1021/la9915421 in citations.
Neutron spin-echo study of the dynamic behavior of amphiphilic diblock copolymer micelles in aqueous solution
Neutron spin-echo study of the dynamic behavior of amphiphilic diblock copolymer micelles in aqueous solution
We examined the dynamics of amphiphilic polymer micelles of the diblock copolymer HOVE-NBVE (hydroxyethylvinyl ether as a hydrophilic segment and n-butylvinyl ether as a hydrophobic segment) in aqueous solution using the neutron spin-echo (NSE) technique. The time-correlation function obtained for t...
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Personal Name(s): | Zorn, R. |
---|---|
Monkenbusch, M. / Richter, D. / Matsuoka, H. / Yamamoto, Y. / Nakano, M. / Endo, H. / Yamaoka, H. / Seto, H. / Kawabata, Y. / Nagao, M. | |
Contributing Institute: |
Institut für Festkörperforschung; IFF |
Published in: | Langmuir, 16 (2000) S. 9177 - 9185 |
Imprint: |
Washington, DC
ACS Publ.
2000
|
Physical Description: |
9177 - 9185 |
DOI: |
10.1021/la9915421 |
Document Type: |
Journal Article |
Research Program: |
Polymere, Membranen und komplexe Flüssigkeiten |
Series Title: |
Langmuir
16 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1021/la9915421 in citations.
We examined the dynamics of amphiphilic polymer micelles of the diblock copolymer HOVE-NBVE (hydroxyethylvinyl ether as a hydrophilic segment and n-butylvinyl ether as a hydrophobic segment) in aqueous solution using the neutron spin-echo (NSE) technique. The time-correlation function obtained for the polymer micelles was well fitted by double exponential function, and the fast and slow modes could be estimated separately. The slow mode was dominant at smaller scattering angles, and showed an excellent linearity in Gamma (decay rate) vs q(2) (scattering vector) plot. The diffusion coefficient evaluated from its slope and the hydrodynamic radius, R-h, by the Einstein-Stoke equation were consistent with the size of the polymer micelle that was estimated by small-angle neutron scattering (SANS), small-angle X-ray scattering (SAXS), and dynamic light scattering (DLS). Hence, this slow mode reflects the translational diffusion of the polymer micelle in aqueous solution. The fast mode, which was 1 order of magnitude faster than the slow mode, was a major factor for larger scattering angle regions in which the SANS curve showed blob scattering Thus, the fast mode appears to be an internal motion of the polymer micelle, like the breathing mode of the hydrophilic shell (corona) around the polymer micelle. |