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 38 for “"surface reactivity"”.
-
Crystal morphology and surface reactivity studies of calcium hydroxide
… thermal stability and chemical stability of the surface. Silylation was found not to occur by direct contact between the precipitated calcium hydroxide samples and silylating agents. Silylation only occurred when precipitation was carried out in the presence of a solution of the silylating agent …
-
Understanding surface reactivity, local structure, and lithium-metal dendrite initiation in garnet solid electrolytes
… Despite receiving much attention, the surface reactivity, regeneration, local structure of dopants in doped LLZO and the dendrite formation have not been systematically characterized and understood. This thesis elucidates the importance of the gas atmosphere and temperature for …
-
Surface Reactivity and Dissolution Rate of Galena: Potential Impact of CO2 Leakage from Geological Carbon Sequestration on Groundwater Quality
Geological carbon sequestration is one promising solution to mitigating CO2 emissions and curtailing global
-
Impact of extended defects on ion diffusion and reactivity in binary oxides : assessed by atomistic simulations
… such as dislocations, grain boundaries and surface step edges, are ubiquitous in nanomaterials that function in electrochemical devices and heterogeneous catalysts. The objective of this thesis is to advance the understanding of the influence of extended defects on ion diffusion and surface …
-
Directed Self-Assembly of Polymer-Decorated Nanoparticles
… main goal of this thesis is to shed light on the surface behavior of these universally used components. The thesis explores controlling surface reactivity of nanoparticles to great detail and concludes with a proven method to organize the nanoparticles using self-assembly. The consistent and …
-
In Situ Structural Study of Underpotential Deposition and Electrocatalysis on Gold(111) Electrodes
… the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from which we investigate factors that determine UPD surface structures and correlate these structures with surface reactivity.
-
First-Principles Study of Metal -Ceramic Interfaces
… reveal a trend in Wad with respect to the summed surface energies of the interfaced materials (sigmaAl + sigmaceramic). Specifically, we find that surfaces having larger sigma's adhere at interfaces more strongly than those with small sigma's. We argue that this behavior is consistent with the …
-
Materials design and discovery of catalysts for small molecule conversion
… has stemmed from a lack of systematic studies of surface reactivity at thermodynamic conditions relevant to the reaction of interest and understanding of chemical origins of such reactivity trends.
-
Characterization of Magnetite Nanoparticle Reactivity in the Presence of Carbon Tetrachloride
… iron oxide, is a ubiquitous component of many subsurface environments and has been investigated as a potential groundwater remediation technology. One beneficial characteristic of magnetite is the capability to be synthetically produced in various sizes and shapes - including particles within the …
-
Spectroscopic Studies on the Interaction of Cetylpyridinium Bromide Monohydrate and Bromothymol Blue with Polymerized Silica
… bromide monohydrate (CPBM) to a silica surface that has been modified with Poly(styrene-<em>co</em>-maleic anhydride), a pH switchable polymer. Ultraviolet spectroscopic trials were conducted measuring the absorbance of BB and CPBM at 3 pH levels and 3 different surface reactivity levels …
-
Computational and Data-Driven Design of Perturbed Metal Sites for Catalytic Transformations
… In addition, novel physics effect controlling surface reactivity beyond conventional understanding is uncovered. Secondly, we develop a computational and data-driven framework to model high entropy alloy (HEA) catalysis, incorporating thermodynamic descriptor-based phase stability evaluation, …
-
Advancing Catalysis Theory with Theory-infused Deep Learning
… with the physical principles governing catalytic surfaces. In this dissertation, We will highlight the role of TinNet in the rapid development of new catalytic materials, emphasizing its crucial contribution to sustainable chemical processes. The framework is particularly flexible at predicting …
-
Development Of Single And Array Electro-Chemical Sensors For Real-Time Trace Metal Analysis In Aqueous Environmental Media
… via inhibition of other species’ adsorption at surface oxygen groups. This stepwise functionalization approach served as a universal platform for elevating CFMs’ selectivity, while retaining sensitivity, response, stability, and lifetime.</p> <p>In parallel work, pyrolyzed photoresist film …
-
Understanding the Toxicity Effects of Nanostructures: I. Effect of Physico-chemical Properties on Environmentally Relevant Organismal Toxicity. II. Design of Novel Nanostructures to Reduce Environmental Toxicity while Retaining Functional Properties
… be necessary for shape-based phytotoxicity. The surface reactivity was experimentally calculated for each nanomaterial to determine if different surface reactivity between different AgNM shapes could further explain phytotoxicity. It was shown that this value correlated to phytotoxicity, …
-
Desulfurization by reactive adsorption on oxide/metal composites
… this thesis go beyond the role of oxides in surface reactivity to cases where bulk solid state reactivity is important. In experiments studying reactive desulfurization, different synthetic techniques were used to extend zinc oxide’s temperature range by combining structural and compositional …
-
Dynamic measurement and control of electrochemical interfaces for energy storage and conversion
… several studies that quantitatively measure reactivity at electrode interfaces and explore new materials approaches for controlling that reactivity in the realms of energy conversion (electrocatalysis) and energy storage (batteries). Chapter 1 outlines the complexity of the electrode …
-
Engineering carbide nanoparticles coated with noble metal monolayers for catalysis
… toolkit is ill-equipped to optimize the reactivity, stability, and loading of NM catalysts. The technologies developed in this thesis have two overarching implications. First, a method is developed to engineer non-sintered and metal-terminated transition metal carbide (TMC) nanoparticles. …
-
Model systems for the study of active phase evolution in complex bimetallic catalysts (PdZn)
… phase transformations and its influence on reactivity. Aerosol synthesis was used to study the oxide precursors of the PdZn system, spin coating was used to synthesize model PdZn nanoparticles for phase transformations studies and preliminary work with CO oxidation coupled with methanol …
-
Effect of interface structure on film polarization and surface chemistry in ultra-thin TiO2/BaTiO3 Heterostructures
… control film polarization, in turn tailoring the surface reactivity. The polarization of the BaTiO3 is expected to affect the surface chemistry TiO2 thin film and adsorption energy of water molecules on the surface. However, thin-film perovskites such as BaTiO3 are subject to depolarization …
Page 1 of 2