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Published By Sociedade Brasileira De Quimica (Sbq)

1984-6835, 1984-6835

Author(s):  
Uanderson Mezavila-Garcia ◽  
Janaina S. Santos ◽  
Elidiane C. Rangel ◽  
Nilson C. Cruz ◽  
Francisco Trivinho-Strixino

In this work, the assembly of a low-cost metallizer is presented, based on physical vapor deposition, to obtain metallic aluminum film deposited over a glass substrate. Later, the Al film is anodized and converted into a porous nanostructured oxide film. The metallic film thickness was measured by profilometry, and the sample position inside the chamber was evaluated. Samples positioned at the center of the sample holder showed considerable thickness and best homogeneity compared to those samples positioned at the edges of the sample holder. A thick metallic film of Al (6 to 7 µm) was deposited over the glass substrate for subsequent anodizing treatment. Mild anodization allowed the total conversion of metallic Al after 7000 s, producing a transparent anodic aluminum oxide (AAO) film adhered to the glass substrate. The AAO morphology was investigated by SEM. Some factors have been listed to describe the low regularity and homogeneity of nanopores in the outer layer of AAO, such as internal defects, compaction of deposited Al film layers and the glass substrate roughness.


Author(s):  
Priscila B. B. Ferrari ◽  
Alessandro K. Jordão ◽  
Anna C. Cunha ◽  
Vitor F. Ferreira ◽  
Juliana Schultz ◽  
...  

Author(s):  
Alexandre Diógenes Pereira ◽  
Aline Aparecida Carvalho França ◽  
Kerlane Alves Fernandes ◽  
Ana Karina Borges Costa ◽  
Sâmia Dantas Braga ◽  
...  

Dichlorotristriphenylphosphinerruthenium(II) complex was used as initiator in isomerization reactions of methyl-eugenol to iso-methyl-eugenol, under controlled atmosphere. The reactions were performed for 24 h in CO2 atmosphere as an oxygen-free atmosphere alternative system, at temperatures of 25, 50 and 75 °C, with a catalyst/substrate ratio of 1: 100 mol. At the end of each experiment, an aliquot of the reaction mixture was removed and analyzed by GC-MS. Approximately 85 % conversion and 75 % selectivity were observed when the experiments were carried out at 50 °C.


Author(s):  
Jonkácio Almeida de Melo ◽  
Luciana Poty Manso dos Santos ◽  
Raquel Martins de Almeida ◽  
Ricardo Toshio Fujiwara ◽  
Sebastião Rodrigo Ferreira ◽  
...  

Author(s):  
Symone Costa de Castro ◽  
Naiara Maia Oliveira ◽  
Janiel Ramos de Oliveira ◽  
Luciana Lucas Machado ◽  
Katyúscya Veloso Leão ◽  
...  

Author(s):  
Júlia Martinelli de Oliveira ◽  
Míriam Tvrzská de Gouvêa ◽  
Daniela Helena Pelegrine Guimarães ◽  
José Pucci Caly ◽  
Maria Thereza de Moraes Gomes Rosa
Keyword(s):  

2021 ◽  
Vol 13 (3) ◽  
pp. 747-755
Author(s):  
Geni dos S. Maria ◽  
Daniel das C. A. Ribeiro ◽  
Camila G. Passos ◽  
Maria do C. M. Alves
Keyword(s):  

Author(s):  
Antônio Luthierre Gama Cavalcante ◽  
Christian Gama Cavalcante ◽  
Regilany Paulo Colares ◽  
Daniele Alves Ferreira ◽  
Francisco Felipe Maia da Silva ◽  
...  
Keyword(s):  

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