Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.1829039
DC FieldValue
dc.titleStructure of strongly interacting polyelectrolyte diblock copolymer micelles
dc.contributor.authorKorobko, A.V.
dc.contributor.authorJesse, W.
dc.contributor.authorLapp, A.
dc.contributor.authorEgelhaaf, S.U.
dc.contributor.authorVan Der Maarel, J.R.C.
dc.date.accessioned2014-10-16T09:42:38Z
dc.date.available2014-10-16T09:42:38Z
dc.date.issued2005
dc.identifier.citationKorobko, A.V., Jesse, W., Lapp, A., Egelhaaf, S.U., Van Der Maarel, J.R.C. (2005). Structure of strongly interacting polyelectrolyte diblock copolymer micelles. Journal of Chemical Physics 122 (2) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.1829039
dc.identifier.issn00219606
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/98070
dc.description.abstractThe structure of spherical micelles of the diblock poly(styrene-block- acrylic acid) [PS-b-PA] copolymer in water was investigated up to concentrations where the polyelectrolyte coronal layers have to shrink and/or interpenetrate in order to accommodate the micelles in the increasingly crowded volume. We obtained the partial structure factors pertaining to the core and corona density correlations with small angle neutron scattering and contrast matching in the water. The counterion structure factor was obtained with small angle x-ray scattering (SAXS) with a synchrotron radiation source. Furthermore, we have measured the flow curves and dynamic visco-elastic moduli. The functionality of the micelles is fixed with a 9 nm diameter PS core and a corona formed by around 100 PA arms. As shown by the SAXS intensities, the counterions are distributed in the coronal layer with the same density profile as the corona forming segments. Irrespective ionic strength and micelle charge, the corona shrinks with increasing packing fraction. At high charge and minimal screening conditions, the polyelectrolyte chains remain almost fully stretched and they interdigitate once the volume fraction exceeds the critical value 0.53±0.02. Interpenetration of the polyelectrolyte brushes also controls the fluid rheology: The viscosity increases by three orders of magnitude and the parallel frequency scaling behavior of the dynamic moduli suggests the formation of a physical gel. In excess salt, the coronal layers are less extended and they do not interpenetrate in the present concentration range. © 2005 American Institute of Physics.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1063/1.1829039
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1063/1.1829039
dc.description.sourcetitleJournal of Chemical Physics
dc.description.volume122
dc.description.issue2
dc.description.page-
dc.description.codenJCPSA
dc.identifier.isiut000226699000063
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

28
checked on May 28, 2022

WEB OF SCIENCETM
Citations

27
checked on May 20, 2022

Page view(s)

120
checked on May 26, 2022

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.