Banca de DEFESA: JOÃO FREIRE DE MEDEIROS NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOÃO FREIRE DE MEDEIROS NETO
DATE: 30/01/2020
TIME: 10:30
LOCAL: Sala 414 do CTEC - UFRN
TITLE:

PLASMA'S EFFICIENCY IN DIELECTRIC BARRIER DISCHARGE IN MATERIAL MODIFICATION: EFFECT ON THE PHYSICAL-CHEMICAL ALTERATIONS OF HIGH DENSITY POLYETHYLENE AND TITANIUM

KEY WORDS:

Plasma DBD, HDPE, Titanium, Langmuir, Wettability

PAGES: 60
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The superficial modification of materials is the object of studies in research centers, due to their impact in optimizing the applicability of the same. The use of plasma DBD is an alternative that blends the desired effects with the modification of surfaces and the low cost. In order to evaluate the physico-chemical modifications of materials and their correlations with the energies of the species generated during the treatment using the dielectric barrier discharge (DBD) technique for modifying the surface of high density polyethylene (HDPE) and of Titanium. The treatment of HDPE and Titanium samples was carried out in order to identify the effect of plasma materials that had different character connections. Different treatment parameters were used, considering the character of each material class. The efficiency of the plasma was determined through triple Langmuir probe in order to check if it had enough energy to promote chemical changes on the material surface. Physico-chemical changes were diagnosed through surface characterization techniques such contact angle, surface tension, X-ray excited photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (ATR-FTIR). The Langmuir probe results showed that the generated plasma has sufficient energy to promote the breakage of the bonds present in the treated samples, which corroborates the results obtained in the characterization of the samples through XPS, FTIR-ATR and surface tension

BANKING MEMBERS:
Presidente - 2550377 - THERCIO HENRIQUE DE CARVALHO COSTA
Externo à Instituição - FERNANDO RIBEIRO OLIVEIRA - UFSC
Externo à Instituição - IVAN ALVES DE SOUZA