Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"glassy dynamics"”.
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Structure, Thermodynamics, Mechanical Properties and Glassy Dynamics in Anisotropic Polymeric Materials
… thereby inducing anisotropic segmental dynamics. Either suppression or elevation of ( Tc) is predicted depending on the nature of anisotropy. Results have been obtained for liquid crystalline polymers, thin films, rubber networks and grafted polymer brushes. The underlying mechanism for …
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Surface glassy dynamics and single-molecule absorption of quantum dots detected by scanning tunneling microscopy
… microscopy (STM), I investigated surface glassy dynamics, absorption spectroscopy and intermolecular energy transfer between single quantum dots (QDs) and carbon nanotubes (CNTs). Glass is an exotic state of matter which is not in equilibrium, but can be stable for billions of years. …
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The role of quenched disorder, interfaces and confinement on the glassy dynamics of colloidal suspensions, thermal liquids and films
Understanding the slow activated glassy dynamics of colloidal and thermal (molecular, metallic, polymer) fluids in the presence of quenched disorder, interfaces and/or confinement is of fundamental science importance and relevant for materials applications. My overarching goal is to construct new, …
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Secondary relaxation processes in neat and binary glass formers studied by 2H NMR spectroscopy
… solid state 2H NMR techniques to elucidate glassy dynamics in plastic crystals and binary mixtures of glass forming substances. We focus on the Johari-Goldstein beta-process, which not only plays a key role for the understanding of glassy dynamics in neat systems, but also in binary mixtures …
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Electrical noise study of spin glass dynamics in mesocopic CuMn
… Thus we have probed, for the first time, the glassy dynamics with sufficient microscopic detail to uncover the main features of the dynamical pattern. The results are incompatible with the simple 'droplet' picture of spin glasses which is currently in vogue. Noise statistics reveal instead …
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Electrical noise study of spin glass dynamics in mesoscopic copper manganese
… Thus we have probed, for the first time, the glassy dynamics with sufficient microscopic detail to uncover the main features of the dynamical pattern. The results are incompatible with the simple 'droplet' picture of spin glasses which is currently in vogue. Noise statistics reveal instead …
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A Random First Order Theory of Liquid -Glass Transition
… from the Stokes-Einstein relation in hydrodynamics, and aging have been observed in the laboratory. In this thesis, a microscopically motivated theory of glassy dynamics based on an underlying random first order transition is developed to explain the magnitude and variation of free energy …
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A Random first order theory of liquid-glass transition
… from the Stokes-Einstein relation in hydrodynamics, and aging have been observed in the laboratory. In this thesis, a microscopically motivated theory of glassy dynamics based on an underlying random first order transition is developed to explain the magnitude and variation of free energy …
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Probing water properties and cationic exchange in calcium-silicate-hydrate : an atomistic modeling study
… phase of cement. The microscopic structure and dynamics of water confined in C-S-H have important implications on describing the cohesion and mechanical behavior of cement from its setting to its aging; nevertheless they have not been fully elucidated prior to this thesis. The second problem is …
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On Local Order in Particle Packings
… independent at the onset temperature of glassy dynamics. It is also observed to behave like a heuristic measure of glass-forming ability, which could prove useful when exact methods are intractable.
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Chain dynamical theories of protein folding
… of protein folding must take into account chain dynamics. The energy landscape description of protein folding accommodates two rather distinct behaviors of the polypeptide chain: the glassy dynamics expected for heteropolymers with random interactions and the organized dynamics expected for …
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Quantum Dynamics of Strongly-Interacting Bosons in Optical Lattices with Disorder
… lattices offer an important tool for studying dynamics in many-body interacting systems in a pristine environment. This thesis focuses on three theoretical works motivated by recent optical lattice experiments. In the first, we theoretically study the center of mass dynamics of states derived …
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Rheology and Collective Behavior in Living Tissue
… fluid-like state to a solid-like state, with dynamics that share many features with glass transitions. While a coherent picture has begun to form connecting the microscopic mechanisms that drive this transition with macroscopic observables, much less is known of its consequences in biological …
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Dynamic imaging of nanoparticles on femtoseconds to minutes time scale at atomic resolution
… measurements. Furthermore, in our study of the glassy dynamics of ultra-thin silica films, we achieved exceptional vibrational energy resolution that enabled us to resolve the dynamics and energy levels of 1-nm vibrating silica clusters. In addition, we were able to classify the five …
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Role of strong attractive forces on the dynamics and mechanics of glass and gel forming soft materials
The increasing interest in understanding the slow dynamics of glass and gel forming polymeric and colloidal systems is due to their wide applicability in biology, medicine, chemical physics, soft matter and material science. Although phenomenological and empirical models for slow local dynamics …
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The quasi mode-locked regime: glassy disorder and turbulent dynamics in fiber laser
… us powerful ways to uncover the underlying dynamics and emergent properties of the laser. By collecting realizations (replicas) of the laser output and examining their correlations, we identify signatures of glassy dynamics, including replica symmetry breaking (RSB). This situates the QML …
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Properties of dirty bosons in disordered optical lattices
… questions with regards to the possibility of glassy dynamics.
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Theories of slow dynamics: from glassy colloidal suspensions to entangled macromolecular liquids
Motivated by the intriguing slowing down of dynamics in glassy and polymeric fluids, microscopic theories for the dynamical behavior of these systems are explored. Of particular interest is the relative importance of equilibrium structure and topological constraints on system dynamics, and theories …
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Glassy viscoelasticity of dense suspensions of soft colloids and structure & miscibility of soft filler polymer nanocomposites
… The first part of the thesis studied the glassy viscoelasticity of dense suspensions of soft colloids and the second part of the thesis studied the structure and miscibility of soft filler polymer nanocomposites (PNCs). In the first part of the thesis, we have presented the first …
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Rigidity and Fluidity in Living and Nonliving Matter
… distributed. Such a finding implies that glassy dynamics is possible in a confluent tissue.</p> <p>Finally, in chapter 5 we turn to single cell migration in the extracellular matrix, another native environment of a cell. Experiments suggest that the migration of some cells in the …
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