Abstract/Details

*Ordering and self assembly in charged systems


2003 2003

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Abstract (summary)

We addressed the issue of ordering and self assembly in the context of flexible and semiflexible polyelectrolytes. The problems studied include the configurational and scattering properties of a single semiflexible polyelectrolyte in which we investigated the role of semiflexibility and electrostatics on the chain conformations. Effects of salt concentration and molecular weight have also been studied. Next, we extended the project to study orientational ordering induced by a collection of semiflexible polyelectrolytes with fixed molecular weight. We found rich phase behavior combining a first order Isotropic-Nematic phase transition and a second order critical point due to phase separation. Coupling of semiflexibility, electrostatics and their role on phase transition were investigated. Finally, we considered phase transitions in a solution of polydisperse semiflexible polymers, a problem which gives rise to interesting collective behavior. In the context of self assembly in charged system, we have also studied the process of micellization in a collection of polyelectrolytic diblock copolymers. The critical micelle concentration and its dependence on block molecular weights and salt concentration are discussed. Different problems have been studied with a combination of different analytical tools and numerical methods. The results of our research contrast with the existing literature and provide new insights in the field for future work.

Indexing (details)


Subject
Condensation
Classification
0611: Condensation
Identifier / keyword
Pure sciences, Charged, Ordering, Polyelectrolytes, Self-assembly
Title
*Ordering and self assembly in charged systems
Author
Ghosh, Kingshuk
Number of pages
124
Publication year
2003
Degree date
2003
School code
0118
Source
DAI-B 64/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780493997001, 0493997008
Advisor
Muthukumar, M.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3078686
ProQuest document ID
305322589
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305322589
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