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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Influence of the cold plasma treatment on the Al2O3/ZrO2 nanocomposites surfaces

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Author(s):
Santos, Katia Helena [1] ; Ferreira, Julieta Adriana [1] ; Osiro, Denise [1] ; Carvalho, Rosemary Aparecida de [2] ; Colnago, Luiz Alberto [3] ; Junior, Clodomiro Alves [4] ; Pallone, Eliria Maria de Jesus Agnolon [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, USP, Dept Biosyst Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil
[2] Univ Sao Paulo, USP, Dept Food Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil
[3] Brazilian Agr Res Corp, EMBRAPA Instrumentat, Rua Quinze Novembro 1500-1501, BR-13561206 Sao Carlos, SP - Brazil
[4] Fed Univ Semiarid Reg, UFERSA, Av Francisco Mota 572, BR-59625900 Mossoro, RN - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Applied Surface Science; v. 531, NOV 30 2020.
Web of Science Citations: 0
Abstract

In the present work, Al2O3/ZrO2 nanocomposite surfaces were treated with cold plasma using N-2, H-2, andO(2) gaseous atmospheres. For this, Al2O3/ZrO2 samples were shaped and sintered at 1500 degrees C for 2 h. Then, the surfaces were treated with cold plasma using different N-2 and O-2 gas flow proportions. The H-2 gas flow was maintained at 50%. The treatment conditions were a total gas flow rate of 20 sccm, total pressure of 2.0 mbar, square pulses of voltage with duration of the 50 mu s repeated every 100 mu s, and a temperature of 400 degrees C. The surface treatment, regardless of the gaseous atmospheres, affected the functional groups attributed to ZrO2 significantly more than those of Al2O3. In general, it was observed that the surfaces treated in gaseous atmospheres with a higher proportion of N-2 gas flow had a more hydrophilic character due to the greater amount of active species coming from this gas. Although active N-2 gas species are predominant, active O-2 gas species can also affect ZrO2 functional groups. Thus, the pre-treatment contributes both to increasing hydrophilic character as well as promoting chemical changes in the functional groups present on the nanocomposite surfaces. (AU)

FAPESP's process: 15/07319-8 - Study ultra rapid sintering and low energy consumption: flash Sintering
Grantee:Eliria Maria de Jesus Agnolon Pallone
Support Opportunities: Regular Research Grants