| dc.identifier.uri | http://hdl.handle.net/11401/77825 | |
| dc.description.sponsorship | This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. | en_US |
| dc.format | Monograph | |
| dc.format.medium | Electronic Resource | en_US |
| dc.language.iso | en_US | |
| dc.publisher | The Graduate School, Stony Brook University: Stony Brook, NY. | |
| dc.type | Dissertation | |
| dcterms.abstract | Polymorphic phase transformations are common to all nanocrystalline binary metal oxides. The polymorphic nature of such metal oxides makes available a large number of phases with differing crystal structures, each stable under certain conditions of temperature, pressure, and/or particle size. These different crystal structures translate to unique physical and chemical properties for each structural class of polymorphs. Thus predicting when polymorphic phase transitions are likely to occur becomes important to the synthesis of stable functional materials with desired properties. Theoretical calculations using a heuristic approach have resulted in an accurate estimation of the critical particle size predicting metastable to stable phase transitions. This formula is applied to different case studies: for anatase to rutile titania; γ -Alumina to α -Alumina; and tetragonal to monoclinic zirconia. The theoretical values calculated have been seen to be very close to the experimental results from the literature. Manifestation of the effect of phase transitions in nanostructured metal oxides was provided in the study of metastable to stable phase transitions in WO3. Nanowires of tungsten trioxide have been synthesized in-situ inside an electron microscope. Such structure of tungsten trioxide result due to a metastable to stable phase transformation, from the cubic to the monoclinic phase. The transformation is massive and complete. The structures formed are unique one-dimensional nanowires. Such a method can be scaled inside any equipment equipped with an electron gun, for example lithography systems either using STEM or E-beam lithography. Another study on nanowire formation in binary metal oxides involved the synthesis of stable orthorhombic MoO3 by means of blend electrospinning. Both a traditional single jet electrospinning set up and a novel high-throughput process to get high aspect ratio nanowires. The latter is a jet-controlled and flow controlled electrospinning. The mechanism of the formation of nanowires of both tungsten trioxide and molybdenum trioxide are discussed in relation to the polymorphic nature of the oxides. | |
| dcterms.available | 2017-09-26T17:04:09Z | |
| dcterms.contributor | Gouma, Perena | en_US |
| dcterms.contributor | Gersappe, Dilip | en_US |
| dcterms.contributor | Liu, Mingzhao | en_US |
| dcterms.contributor | Stanacevic, Milutin. | en_US |
| dcterms.creator | Sood, Shantanu | |
| dcterms.dateAccepted | 2017-09-26T17:04:09Z | |
| dcterms.dateSubmitted | 2017-09-26T17:04:09Z | |
| dcterms.description | Department of Materials Science and Engineering. | en_US |
| dcterms.extent | 128 pg. | en_US |
| dcterms.format | Application/PDF | en_US |
| dcterms.format | Monograph | |
| dcterms.identifier | http://hdl.handle.net/11401/77825 | |
| dcterms.identifier | Sood_grad.sunysb_0771E_12033.pdf | en_US |
| dcterms.issued | 2014-05-01 | |
| dcterms.language | en_US | |
| dcterms.provenance | Submitted by Jason Torre (fjason.torre@stonybrook.edu) on 2017-09-26T17:04:09Z
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| dcterms.provenance | Made available in DSpace on 2017-09-26T17:04:09Z (GMT). No. of bitstreams: 1
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Previous issue date: 2014-05-01 | en |
| dcterms.publisher | The Graduate School, Stony Brook University: Stony Brook, NY. | |
| dcterms.subject | Materials Science | |
| dcterms.subject | ceramic materials, electrospinning, nanocrystals, nanowires, phase transitions, polymorphs | |
| dcterms.title | Polymorphism Control in Nanostructured Metal Oxides | |
| dcterms.type | Dissertation | |
