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Slow dynamics and aging in metastabl...

Dhillon, Param Pash.

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Slow dynamics and aging in metastable systems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Slow dynamics and aging in metastable systems./
Author:	Dhillon, Param Pash.
Description:	79 p.
Notes:	Adviser: David R. Reichman.
Contained By:	Dissertation Abstracts International68-10B.
Subject:	Chemistry, Inorganic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285465
ISBN:	9780549279525

Slow dynamics and aging in metastable systems.
Dhillon, Param Pash.

Slow dynamics and aging in metastable systems. - 79 p.

Adviser: David R. Reichman.

Thesis (Ph.D.)--Harvard University, 2007.

This thesis focuses on slow dynamics in glass-forming systems. We tackle a range of problems, including the microscopic nature of elasticity, aging, and the development of a microscopic theoretical description of these systems.

ISBN: 9780549279525Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Slow dynamics and aging in metastable systems.
LDR:02939nam 2200301 a 45 001 962775
005 20110830
008 110831s2007 ||||||||||||||||| ||eng d
020 $a 9780549279525
035 $a (UMI)AAI3285465
035 $a AAI3285465
040 $a UMI $c UMI
100 1 $a Dhillon, Param Pash. $3 1285835
245 1 0 $a Slow dynamics and aging in metastable systems.
300 $a 79 p.
500 $a Adviser: David R. Reichman.
500 $a Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6655.
502 $a Thesis (Ph.D.)--Harvard University, 2007.
520 $a This thesis focuses on slow dynamics in glass-forming systems. We tackle a range of problems, including the microscopic nature of elasticity, aging, and the development of a microscopic theoretical description of these systems.
520 $a First, we connect dynamical heterogeneity and elasticity in a supercooled liquid near the glass transition. Using standard molecular dynamics techniques, we simulate a polydisperse system of hard spheres, and focus on dynamically slow particles. We find that in a supercooled liquid, a cluster of slow particles spans the system at short time scales, but dissociates on longer time scales. However, in the glass, spanning clusters persist for all observable time scales. The lifetime of the spanning cluster is quantitatively connected to the viscoelastic moduli of the system, thus establishing a link between microscopic dynamical heterogeneity and elasticity, the macroscopic feature that distinguishes a glass from a liquid.
520 $a We then shift to the aging behavior in a stripe-forming system quenched below the order-disorder transition, simulated with Langevin dynamics. In order to study fluctuation-dissipation relations, we develop a field-free method to calculate the integrated response function. This allows us characterize the evolution of this metastable system towards equilibrium. We find that the aging behavior of this system resembles neither simple coarsening nor simple glassy behavior. The aging is more rich than either of these scenarios, bearing some resemblance to that of critical coarsening systems.
520 $a Finally, we focus on the theoretical description of supercooled liquids near the glass transition, employing a new time-local mode-coupling approach which is motivated by recent work on turbulent systems. We present the results of this approach on a toy model inspired by microscopic considerations, and find some noteable improvements over mode-coupling theory, including the disappearance of the dynamically sharp glass transition and an exponential dependence of the relaxation times on the coupling strength.
590 $a School code: 0084.
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0488
710 2 $a Harvard University. $3 528741
773 0 $t Dissertation Abstracts International $g 68-10B.
790 $a 0084
790 1 0 $a Reichman, David R., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285465