Banca de QUALIFICAÇÃO: ALLAN MIGUEL FRANCO DE AMORIM

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ALLAN MIGUEL FRANCO DE AMORIM
DATE: 17/08/2020
TIME: 08:30
LOCAL: VIRTUAL
TITLE:

Synthesis and Characterization of Copper Oxides Nano-wires produced by Term Oxidation


KEY WORDS:
Copper Oxide, Heterojunction, Nanowires, Nanostructures, Thermo-Oxidation.

 

 

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:
This work investigated the formation of copper oxide nanowires through the oxidation process of metallic copper sheets to understand how the synthesis conditions influence the concentration and structure of the oxides. For that, X-ray diffraction and scanning electron microscopy (SEM) characterizations were performed. The nanowire synthesis process was first evaluated in the treatment of metallic copper sheets before the oxidation process and then in the thermal process performed in atmospheric environment. Two treatment procedures were investigated, namely: immersion in chloridric acid solution followed by immersion in ethanol in ultrasound; and immersion in acetone followed by immersion in isopropyl alcohol in ultrasound. The thermal process was evaluated with experimental design using the following parameters: temperature (400-700 °C), heating rate up to the threshold temperature (5-15 ° C/min) and process duration (3-9 hours). The samples were analyzed for the presence of nanowire structures and its diameters. Crystalline structures were identified as oxide copper I and II (CuO and Cu2O) in addition to metallic copper in all tests performed, which were evaluated in terms of its proportion compared to the different thermal regimes tested. It is concluded that the treatment with chloridric acid solution and ethanol is more effective in promoting a porous medium, which promotes more active sites for the oxidation of metallic copper. Moreover, temperature and process duration were proved to influence nanowire concentration and thickness which increase for higher process temperatures and process durations.


BANKING MEMBERS:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externa à Instituição - YARA FELICIANO GOMES - UFRN
Notícia cadastrada em: 10/08/2020 08:16
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