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.
Results
Showing 1 to 20 of 104 for “"Crystalline materials"”.
-
Device Physics of Two-Dimensional Crystalline Materials
… their simplest form, existing merely in a single crystalline atomic layer and exposing the states to external controls. Triggered by graphene, the interest in a variety of other 2D crystals, such as atomically thin transition metal dichalcogenides (TMDs), has recently exploded, revising the …
-
Phonon Thermal Transport in Non-Crystalline Materials
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-09T22:09:40Z No. of bitstreams: 1 1975_zaitlin.pdf: 4748430 bytes, checksum: 1b58a9b1eed5b1569f286984be435f46 (MD5)
-
Nanomechnics of crystalline materials : experiments and computations
… systematically the mechanisms of deformation in crystalline materials. Such insight can be used to exploit and avoid contact in actuator and sensor applications, to derive mechanical properties for engineering of materials, and to investigate the fundamental role of defects. Here, localized …
-
Modeling Collective Behavior of Dislocations in Crystalline Materials
A part of this work deals with the kinematics of dislocation density evolution. An explicit Galerkin/least-squares formulation is introduced for the quasilinear evolution equation, which leads to a symmetric and well-conditioned system of equations with constant coefficients, making it attractive …
-
Heat transport by phonons in crystalline materials and nanostructures
… studies of heat transport by phonons in crystalline materials and nanostructures, and across solid-solid interfaces. Particularly, this dissertation emphasizes advancing understanding of the mean-free-paths (i.e., the distance phonons propagate without being scattered) of acoustic …
-
Ultra low thermal conductivity in layered disordered crystalline materials
… a dense solid. Thin films of disordered layered crystalline materials were deposited using Modulated Elemental Reactants (MER) method. Cross-plane thermal conductivity was measured using Time-Domain Thermo Reflectance (TDTR) method; elastic properties were investigated using picosecond acoustics. …
-
Incorporation of Nonconventional Crystalline Materials onto the Integrated Photonics Platform
… have a growing need for new device types and materials. These advanced devices require electrical and optical properties that, in some cases, can only be provided by truly single-crystal thin-films of nonconventional materials, such as lithium niobate (LN, LiNbO3), yttrium aluminum garnet …
-
The synthesis of liquid crystalline materials for organic semiconductor device applications
… of novel photo- and chemically-reactive, liquid crystalline monomers (reactive mesogens) with improved charge-transporting properties. Low-molar-mass (LMM) liquid crystalline monomers, based on a series of substituted dibenzothiophenes, thiophenes, [2,2']-bithiophenes, thieno[3,2-b]thiophenes, …
-
Investigating the Properties and Lattice Vibrations of Ordered and Disordered Crystalline Materials
Crystalline materials are known for their well-defined periodic structure and their properties have been widely applied in numerous fields. An ideal single crystal will exhibit a perfect ordered structure. However, in most crystalline materials defects and dislocations are commonly present and the …
-
Structure–Property Relationships in Hybrid Crystalline Materials for Multifunctional Light–Matter Interactions
… enable quantum communication. However, finding materials that exhibit strong and stable nonlinear responses under everyday conditions remains a major challenge. Many existing materials only work at very low temperatures or degrade quickly when exposed to light, air, or heat. This dissertation …
-
Ab initio computational applications of electronic structure and spectroscopic Properties of bulk Crystalline materials
… α-Ga type boron are metallic or semi-metallic materials. Based on the electronic structures of α-Ga type and β-t-B190, they both probably have poor conductivity; however the mechanisms are very different: the density of states of α-Ga type shows that there is a pseudogap existing, while the …
-
An investigation into the synthesis, structural characterisation, thermal and polymorphic behaviour of organic crystalline materials
… synthesis and application of solid state organic materials have a big impact upon society, e.g. pharmaceuticals. Traditionally, the process of selecting active pharmaceutical ingredients (APIs) was limited to free drug or accepted salt formulations. The cocrystallisation of APIs with a former …
-
Hydrogen storage in porous crystalline materials: insights on the role of interaction strength from simulation and machine learning
… research has been performed on hydrogen storage materials, it is still unclear whether these storage demands can be met by physisorption-based hydrogen storage systems. To assess the viability of these targets, grand canonical Monte Carlo (GCMC) simulations were used to calculate 18,000+ hydrogen …
-
Application of in situ full-field measurement in the transmission electron microscope: Mechanical property extraction from amorphous to crystalline materials
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
-
Determination of the CTE tensor of materials from high temperature X-ray diffraction
… and visualize thermal expansion properties of crystalline materials in three dimensions. The software can be used to determine the independent terms of the second rank thermal expansion tensor using hkl values, corresponding d-hkl listings, and lattice constants obtained from powder XRD …
-
The co-crystallisation of sugars by the supersaturation process
… sweeteners such as saccharin.Analysis of the materials yielded from the supersaturation process was done primarily by differential scanning Calorimetry (DSC) and powder x-ray diffraction (PXRD). DSC analysis allowed information to be obtained on the thermal behaviour of the various …
-
Evaluation of Non-Covalent Interaction Models in Molecular Crystals Using Terahertz Spectroscopy
… low-frequency vibrational spectra of solid-state crystalline materials. Since THz spectroscopy is sensitive to both the intermolecular and intramolecular forces that govern the formation of crystalline materials, it is an ideal tool to investigate the accuracy of calculated DFT crystal structures …
-
Assessing electronic transport in solid materials via the fluctuation-dissipation theorem
… come with prohibitive computational costs, since crystalline materials typically require both dense reciprocal-space 𝐤-grids for the electronic degrees of freedom and large real-space supercells for the vibrational ones. This is especially challenging for the charge transport coefficient of …
-
The optimization of the ZSM-5 catalyst activity with respect to crystallinity
… in terms of activity of amorphous, partially crystalline and highly crystalline materials using isomerisation of para-xylene as the probe reaction.
Page 1 of 6