Phase transitions in Polyelectrolyte systems (Record no. 48855)
[ view plain ]
| 000 -LEADER | |
|---|---|
| fixed length control field | 03054nam a2200265Ia 4500 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 160627s2012||||xx |||||||||||||| ||und|| |
| 080 ## - UNIVERSAL DECIMAL CLASSIFICATION NUMBER | |
| Universal Decimal Classification number | HBNI Th56 |
| 100 ## - MAIN ENTRY--AUTHOR NAME | |
| Personal name | Anoop Varghese |
| Relator term | author |
| 245 ## - TITLE STATEMENT | |
| Title | Phase transitions in Polyelectrolyte systems |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Year of publication | 2012 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Number of Pages | 101p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | 2012 |
| 502 ## - DISSERTATION NOTE | |
| Degree Type | Ph.D |
| 502 ## - DISSERTATION NOTE | |
| Name of granting institution | HBNI |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc | Polyelectrolytes (PEs) are polymers whose monomers contain ionizable groups that dissociate in polar solvents, releasing charged counterions into the solvent, thereby making the polymer backbone charged. The thermodynamic properties of a PE is different from that of a neutral polymer because of the interplay between the long-range Coulomb interactions and short-range excluded volume interactions. For low linear charge densities of the polymer backbone, thermal fluctuations dominate over electrostatic interactions, and the counterions will be uniformly distributed in the solution. For high linear charge densities, electrostatic interactions dominate thermal fluctuations, and the counterions condense on the PE chain. As the linear charge density is increased from low values to high values, the system undergoes a series of phase transitions. This thesis studies different phases of three different PE systems, and the transitions between them. The first system is a single flexible PE chain in a solvent containing explicit counterions. In this system, the author identifies the counterion condensation and the condensed counterion mediated collapse of the PE chain as phase transitions. It is argued, against the existence of intermediate phases between the extended and collapsed phases. The second system is a collection of similarly charged rod-like PE chains in the presence of neutralizing counterions. In this system, the aggregation of PE chains induced by condensed counterions is studied, and it is related to the extended-collapsed transition of a single flexible PE chain. The third system that is considered, is a two-dimensional charged disc surrounded by freely moving oppositely charged counterions, and it is studied in both the canonical and microcanonical ensembles. The Coulomb interactions in PE systems are long-ranged, i.e., they decay slower than r(−d) for r ≫ 1, where r is the inter-particle separation and d is the dimension of the system. A possible consequence is the inequivalence of different statistical ensembles. By comparing the thermodynamics obtained from the analytical solutions in the canonical and microcanonical ensembles, it is shown that the ensembles are identical for the counterion condensation on a two-dimensional charged disc. |
| 650 14 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Physics |
| 653 10 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | HBNI Th56 |
| 653 10 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | Phase Transitions |
| 653 10 - INDEX TERM--UNCONTROLLED | |
| Uncontrolled term | Poly Electrolyte Systems |
| 720 1# - ADDED ENTRY--UNCONTROLLED NAME | |
| Thesis Advisor | Rajesh Ravindran |
| Relator term | Thesis advisor [ths] |
| 720 1# - ADDED ENTRY--UNCONTROLLED NAME | |
| Thesis Advisor | Satyavani Vemparala |
| Relator term | Thesis advisor [ths] |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | http://www.imsc.res.in/xmlui/handle/123456789/343 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | THESIS & DISSERTATION |
| Withdrawn status | Lost status | Damaged status | Not for loan | Current library | Full call number | Accession Number | Uniform Resource Identifier | Koha item type |
|---|---|---|---|---|---|---|---|---|
| IMSc Library | HBNI Th56 | 68724 | http://www.imsc.res.in/xmlui/handle/123456789/343 | THESIS & DISSERTATION |