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1998
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Poole PH, Donati C, Glotzer SC
Spatial correlations of particle displacements in a glass-forming liquid
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 261 (1-2): 51-59 DEC 1 1998
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View Abstract
We define a generic correlation function that quantifies the spatial correlation of single-particle displacements in liquids and amorphous systems. We evaluate this function using computer simulations of an equilibrium glass-forming liquid, and show that the displacements of particles are spatially correlated over a range that grows with decreasing temperature as the glass transition is approached.
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Karim A, Douglas JF, Lee BP, Glotzer SC, Rogers JA, Jackman RJ, Amis EJ, Whitesides GM
Phase separation of ultrathin polymer-blend films on patterned substrates
PHYSICAL REVIEW E 57 (6): R6273-R6276 JUN 1998
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View Abstract
The phase separation of ultrathin polymer-blend films of polystyrene and polybutadiene on microcontact printed alkanethiol patterns with hydrophobic and hydrophilic end groups (-CH3 and -COOH) is investigated by atomic force microscopy. Simulations suggest that the phase-separation morphology can be controlled through patterns that modulate the polymer-surface interaction, and this concept is verified experimentally, Length scale pattern control is found to be limited to a scale on the order of a few micrometers.
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Glotzer SC, Jan N, Lookman T, MacIsaac AB, Poole PH
Dynamical heterogeneity in the Ising spin glass
PHYSICAL REVIEW E 57 (6): 7350-7353 JUN 1998
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We investigate the relationship between bulk and local relaxation in the Ising spin glass (in two and three dimensions) for temperatures above but approaching the glass transition temperature, using Monte Carlo computer simulations. We find that the stretched exponential form of the bulk spin autocorrelation function results from a spatial average over a broad range of behavior, from strongly nonexponential to nearly exponential, for the local autocorrelation functions. The spatial correlation of single-site relaxation times obtained from these functions provides a length scale for dynamical heterogeneity that grows with decreasing temperature.
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Donati C, Douglas JF, Kob W, Plimpton SJ, Poole PH, Glotzer SC
Stringlike cooperative motion in a supercooled liquid
PHYSICAL REVIEW LETTERS 80 (11): 2338-2341 MAR 16 1998
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View Abstract
Extensive molecular dynamics simulations are performed on a glass-forming Lennard-Jones mixture to determine the nature of the cooperative motions occurring in this model fragile liquid. We observe stringlike cooperative molecular motion ("strings") at temperatures well above the glass transition. The mean length of the strings increases upon cooling, and the string length distribution is found to be nearly exponential.