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Showing 1 to 16 of 16 for “"amorphous systems"”.
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Investigating the Relationships Between Disorder, Structure, and Dynamics in Amorphous Systems
… the disorder, structure, and deformation in amorphous materials. First, to understand the surprising low-frequency vibrational modes in structural glasses, and how it arises from the microscopic disorder in the system, we study the spectra of a large ensemble of sparse random matrices where …
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Physical Models in Community Detection with Applications to Identifying Structure in Complex Amorphous Systems
… in terms of speed and the size of solvable systems. Being a "local" measure of community structure, our Potts model is free from a "resolution limit" that hinders community solutions for some popular community detection models. It further remains a local measure on weighted and directed …
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Investigating the Variations in Molecular Mobility within Amorphous Formulations using Terahertz Spectroscopy
… can be overcome by formulating such drugs into amorphous solid dispersions (ASDs). ASDs can load higher doses of drugs, but they are at a higher energy state than their crystalline counterparts, which leads to recrystallisation over time. In this thesis, terahertz time-domain spectroscopy …
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Toughening mechanisms in composites of miscible polymer blends with rigid filler particles
… been more successful in semicrystalline than in amorphous systems. An amorphous polymer blend was chosen to elucidate the effect of matrix properties on the toughening mechanism. The ternary blend of PMMA, PVC, and DOP (a common plasticizer) was characterized using TEM, and was found to be …
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Optische Eigenschaften von Phasenwechselmaterialien für zukünftige optische und elektronische Speicheranwendungen
… In this work the optical properties of the amorphous and crystalline phases play a crucial role. Optical properties contain information about the chemical bonding and even about electrical transport parameters. If free carrier have enough influence on the optical properties, the conductivity …
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Electron spin-lattice relaxation in proteins, model heme complexes and ferricyanide solutions at helium temperatures
… two-phonon (Raman) process in simple crystalline systems has been demonstrated to follow a power-law (T$\sp{\rm n}$), with n = 9.0. The anomalously weak temperature dependence for protein systems has been tentatively explained in terms of a fractal model of protein dynamics, where the temperature …
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Effects of water on chemomechanical instabilities in amorphous silica : nanoscale experiments and molecular simulation
We elucidate the tensile failure mechanism of amorphous silica and the effects of water on the process, combining: (a) atomic force microscope (AFM) bending tests, (b) molecular dynamics (MD) simulation and (c) molecular orbital (MO) simulation. Bending tests of silica nanowires provide validation …
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Development of Methods to Predict and Enhance the Physical Stability of Hot Melt Extruded Solid Dispersions
The application of amorphous solid dispersions is one of the most widely used formulation strategies for the enhancement of in-vitro and in-vivo performance of poorly water-soluble drugs. However, because of their meta-stable nature, the physical stability of amorphous solid dispersions has been …
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INTEGRATED AND MULTI-SCALE CHARACTERISATION OF GEM MATERIALS LACKING LONG-RANGE ORDER. THE CASE STUDIES OF CHRYSOCOLLA AND ANDEAN BLUE OPAL
… positioned between crystalline and completely amorphous systems, present significant challenges in terms of classification and characterisation, due to their intrinsic heterogeneity and complexity, which conventional analytical techniques are often unable to investigate properly. However, these …
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Work, power, and resetting statistics in stochastic models of physical systems under drive
… thesis, I investigate various non-equilibrium systems and analyse statistics relating to thermodynamic and rheological observables. I start by theoretically considering a cyclically driven engine, analogous to those used in the formulation of classical thermodynamics, which instead uses an …
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Synthesis and Blend Behaviour of Multi-End Capped Polyethylene
… functionalised polymers have great potential in amorphous systems, but for commercial uptake similar results in semi-crystalline materials must be achieved. Polyethylene (PE) is the world’s most widely produced polymer, coming in many grades of molecular weight, branch content, and crystallinity. …
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Molecular dynamics simulation and topological analysis of the network structure of actinide-bearing materials
… borosilicate glass), and three molten salt systems (LiF-BeF2, LiF-ThF4 , and LiF-UF4). I model these materials using molecular dynamics (MD) simulations, and then perform a range of material-dependent analyses - including structural evaluation, species segregation, solubility limits, and …
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Revitalizing Simulations of Colloidal and Interfacial Systems: From Atomistic Trajectories to Data-Centric Insights
… frameworks for investigating complex systems characterized by competing interactions. Structured around three interrelated themes, the research develops methods to tackles challenges in water-in-oil emulsions, chemical inhibition in asphaltene aggregation, and adsorption energy …
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Foaming of amorphous drug delivery systems prepared by hot melt mixing and extrusion
… between foam morphology and performance of amorphous drug delivery systems, which are comprised of an Active Pharmaceutical Ingredient (API) and Polymer excipient. The Hot Melt Extrusion (HME) process is used to compound the following API / polymer binary systems: Indomethacin (INM) with …
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Low temperature properties of the orientationally disordered material: Cyanide-doped potassium bromide
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-08T16:57:28Z No. of bitstreams: 1 1983_moy.pdf: 4243903 bytes, checksum: 8462756e1a40463682f4e378f41e64e0 (MD5)
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Functional Oxides in Optical and Electronic Applications by Atmospheric Pressure Spatial Chemical Vapour Deposition
… electronics, either high-quality epitaxial or amorphous systems are preferred in terms of achieving uniform properties. WO3 thin films can be prepared using multiple deposition techniques, including sputtering, thermal evaporation, and spray pyrolysis. However, the use of Atmo spheric Pressure …