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Showing 1 to 16 of 16 for “"Mode coupling theory"”.
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Impulsive stimulated light scattering from glass-forming liquids : structural relaxation, orientational relaxation and testing of mode coupling theory
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Phase Behavior, Fluid Structure, and Slow Dynamics in Polymer -Colloid Mixtures: Novel Liquid State Theory and Its Applications
… length scales of D-10D in the fluid phase. The theory captures the non-monotonic changes in the local cage order parameter S(k* ≈ 7 D) with increasing polymer concentrations. Accurate, no adjustable parameter predictions of the fluid structure are combined with a single particle version of …
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Topics in transport phenomena near the critical point
The mode-mode coupling theory of Kadanoff and Swift for the estimation of, transport coefficients near the critical point is applied to the calculation of the electrical conductivity near the superconducting transition and to the calculation of the attenuation coefficient for longitudinal sound …
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Studies of kinetic glass transition in a triblock copolymer micellar system
… state of matters. In a hard-sphere system, mode coupling theory (MCT) predicts occurrence of a glass transition when the volume fraction exceeds a certain value due to the excluded volume effect. However, Recent MCT calculations for a hard-sphere system with a short-range attraction show …
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Slow dynamics in supercooled liquids : matrix formalism, mode coupling and glass transition
… liquids are investigated in the framework of the mode-coupling theory (MCT). Following the real-time generalized Langevin equation in Newtonian liquids, the dynamic Gaussian factorization scheme leads to mode-coupling (MC) closures. As an alternative approach to the projection operator technique, …
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Phase Behavior, Microstructure and Mechanics of Colloid -Polymer Mixtures
… we highlight the failure of extant classical models to capture the observed phase behavior over a wide range of polymer-to-particle size asymmetries, particle volume fraction and solvent quality. Accounting for polymerpolymer interactions and polymer chain conformational degrees of freedom, …
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Chain dynamical theories of protein folding
… are studied in this thesis. First, we derive a mode-coupling theory for the dynamics of a random heteropolymer and study the dynamical glass transition signaled by a violation of the fluctuation-dissipation theorem. Next, we develop a variational theory for the smooth free energy surface of …
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The effects of particle shape, size, and interaction on colloidal glasses and gels
… (phi_g) in good agreement with activated naïve Mode Coupling Theory (nMCT) calculations. Differences in fg and the linear elastic modulus (G_0’) due to particle shape can be understood in terms of the Random Close Packed volume fraction (phi_RCP) for each shape; phi_RCP−pih_g is a constant. In …
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Optical study of shear and longitudinal acoustic waves and complex relaxation dynamics of glass forming liquids
… glass forming liquids, allowing both empirical modeling and testing of the predictions of the mode-coupling theory (MCT). Longitudinal and shear acoustic waves throughout much of the MHz frequency range, time-dependent thermal expansion on nanosecond and microsecond scales, and slower thermal …
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Optical characterization of complex mechanical and thermal transport properties
… predictions of the prevailing first principles theory of the glass transition, the mode coupling theory (MCT), photoacoustic measurements throughout much of the MHz acoustic frequency range were conducted in supercooled liquids. Longitudinal and shear acoustic waves were generated and monitored …
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Neutron scattering investigations on the unusual phase behavior of water
… of water is so far lacking. The most promising theory under scrutiny relies on the hypothetical existence of a liquid-liquid phase transition and an associated liquid-liquid critical point hidden in the region of supercooled temperatures and elevated pressures, where bulk water does not exist in …
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Ultrafast photo-acoustic spectroscopy of super-cooled liquids
… experimental methodology and in the theoretical modeling of the results. A particular challenge was posed by the extraordinarily strong damping of gigahertz-frequency acoustic waves in liquids at some temperature ranges. This demanded the design and construction of a liquid sample cell allowing …
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Theory of slow coupled translational-rotational dynamics and viscoelasticity of nonspherical particle suspensions
The naïve mode coupling theory (NMCT) for ideal kinetic arrest and the nonlinear Langevin equation (NLE) theory of activated single-particle barrier hopping dynamics are generalized to describe coupled center-of-mass (CM) translational and rotational motions of uniaxial particles within the …
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The Dynamics of Molecular Glasses Studied by Light Scattering
… The LS spectra are analyzed in the frame of the Mode Coupling Theory (MCT). At high temperatures the evolution of the susceptibility minimum is well described by MCT. Below the critical temperature Tc, the asymptotic scaling laws of MCT fail due to the appearance of the excess wing of the …
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Theoretical investigations of the role of excluded volume, topological constraints, and attractive forces in the slow dynamics of soft matter systems
… function. By developing a self-consistent theory for the force correlations in terms of the packing structure of the fluid we are able to predict a dramatic slowing down of collective dynamics and the possible transition to activated ""hopping"" motions. With these guiding principles, we …
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Shape and chemically anisotropic colloidal particles: A theoretical study of their structure, phase behavior, and slow dynamics
… of particle shape are explored using Naive Mode Coupling Theory (NMCT), and a single particle Non-linear Langevin Equation (NLE) theory. The dynamical behavior of non-ergodic fluids are discussed. We employ a rotationally frozen approach to NMCT in order to determine a transition to center …