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Full-Text Articles in Nanoscience and Nanotechnology

Thermally Stable Encapsulated Intermetallic And Bimetallic Nanoparticles For Heterogeneous Catalysis, Raghu Maligal Ganesh Jan 2017

Thermally Stable Encapsulated Intermetallic And Bimetallic Nanoparticles For Heterogeneous Catalysis, Raghu Maligal Ganesh

Graduate Theses and Dissertations

Intermetallic compounds have shown promise as efficient heterogeneous catalysts, displaying improved performance over their monometallic parent metals for chemical transformations. Furthermore, colloidal intermetallic nanoparticles (iNPs) afford additional improvements via increased catalyst surface area and enhanced catalytic performance. However, these iNPs are not efficiently protected against sintering during thermal treatment procedures such as catalyst regeneration, resulting in a loss of their active surface area. Herein, we have successfully developed porous encapsulation strategies using inert silica that afford monodisperse iNPs that address this concern. These iNPs are highly stable thermally and the inert silica-based mesoporous encapsulation doesn't present mass transfer obstacles ...


Understanding The Reactivity Of Molecular Precursors To Colloidal Nanocrystals, Samuel Ralph Alvarado Jan 2015

Understanding The Reactivity Of Molecular Precursors To Colloidal Nanocrystals, Samuel Ralph Alvarado

Graduate Theses and Dissertations

Colloidal semiconductor nanocrystals are materials with intriguing properties that make them useful for a diverse array of applications such as photocatalysts, light-absorbing materials in solar cells, light emitting diodes and luminescent biological tags, to name only a few. Performance of nanomaterials in these applications is directly related to the size, shape and stoichiometry of the nanocrystals. Strategies exist to control these characteristics during colloidal synthesis, but they tend to rely on certain surfactants, additives, or multi-step procedures to achieve desirable properties. This thesis describes new directions in the synthesis of colloidal nanomaterials that use computational chemistry as a guide. Using ...