Zobrazeno 1 - 10
of 170
pro vyhledávání: '"Wander L. Vasconcelos"'
Autor:
Daniel D. Athayde, Luiz F.S. Lima, Peter G. Weidler, Alysson Martins Almeida Silva, Wander L. Vasconcelos
Publikováno v:
Materials Research, Vol 27 (2024)
Reports on freeze-cast ceramic materials frequently focus on the study of the organized macroporosity and the properties of the materials. This study aims to describe the microstructure evolution of freeze-cast alumina during the sintering process, a
Externí odkaz:
https://doaj.org/article/7ea0a27061514d9282fbee0ceaf642ac
Publikováno v:
Polímeros, Vol 17, Iss 2, Pp 98-103 (2007)
O uso de ardósia em construções tem frequentemente resultado na produção de uma grande quantidade de resíduos particulados que tem pequeno valor mercadológico e grande potencial de danificação do meio ambiente. Neste trabalho, partículas de
Externí odkaz:
https://doaj.org/article/8f6597dafd9f46f3a8411a5a42345efb
Publikováno v:
Polímeros, Vol 14, Iss 2, Pp 129-133 (2004)
Nos últimos anos tem-se verificado uma acentuada desaceleração no desenvolvimento de novos homopolímeros, e nota-se um crescente interesse no estudo e desenvolvimento de processos que misturam os polímeros já existentes, dando origem às blenda
Externí odkaz:
https://doaj.org/article/eb781a2f0e174143a5ef2e0bc51dc157
Publikováno v:
Materials Research, Vol 5, Iss 4, Pp 447-451 (2002)
In this work we studied the influence of microwaves in the pore structure of silica gels obtained via sol-gel polymerization process. We analised the feasibility of replacing conventional heating by microwave heating during drying. Structural paramet
Externí odkaz:
https://doaj.org/article/d3424869db934dd9a43f237dc6e6d141
Publikováno v:
Materials Research, Vol 5, Iss 4, Pp 497-502 (2002)
In this work TiO2-SiO2 glasses containing as much as 20 mol % of TiO2 were prepared via sol-gel process using titanium and silicon alkoxides, in the presence of chlorine, in the form of titanium tetrachloride or HCl. The gels were heat-treated until
Externí odkaz:
https://doaj.org/article/33a8f662b368447aaf4433a59742f5d3
Autor:
Evandro Tolentino, Fernando S. Lameiras, Abdias M. Gomes, Cláudio A. Rigo da Silva, Wander L. Vasconcelos
Publikováno v:
Materials Research, Vol 5, Iss 3, Pp 301-307 (2002)
In this work we analyzed the "residual" performance of Portland cement concretes heat-treated at 600 °C after cooling down to room temperature. Concretes with characteristic compressive strength at 28 days of 45 MPa and of 60 MPa were studied. The h
Externí odkaz:
https://doaj.org/article/2c9b08663b9b422c9cd1e01319d4451f
Publikováno v:
Materials Research, Vol 5, Iss 3, Pp 247-252 (2002)
We have developed a method to obtain polymer hybrids with control of inorganic content and molecular configuration. Hybrid poly(methyl methacrylate) (PMMA) was obtained via atom transfer radical polymerization (ATRP) initiated by octafunctional cubic
Externí odkaz:
https://doaj.org/article/a6f70b8b8f6d4ca9acc02c263ba0fbd9
Autor:
Evandro Tolentino, Fernando S. Lameiras, Abdias M. Gomes, Cláudio A. Rigo da Silva, Wander L. Vasconcelos
Publikováno v:
Materials Research, Vol 5, Iss 1, Pp 27-36 (2002)
We evaluated the "residual" thermal conductivity of Portland cement concretes (with characteristic compressive strength at 28 days, f ck, of 20 MPa and 50 MPa) at room temperature after heat-treating at 180 °C, 300 °C and 600 °C. The description o
Externí odkaz:
https://doaj.org/article/2763a18dc911423bad5ecc0072c30736
Publikováno v:
Materials Research, Vol 2, Iss 3, Pp 127-132 (1999)
A systematic methodology for microstructural description can help the task of obtaining the processing x microstructure x properties x performance relationships. There are, however, some difficulties in performing this task, which are related mainly
Externí odkaz:
https://doaj.org/article/2d8bc309420e4d3b941708255d62581a
Autor:
Daniela C. Leite Vasconcelos, Maria das Graças M.M. Cesar, Marco Antônio da Cunha, Wander L. Vasconcelos
Publikováno v:
Materials Research, Vol 2, Iss 3, Pp 159-164 (1999)
The oxide layer formed on the surface of a grain oriented silicon steel was characterized by SEM and EDS. 3% Si steel substrates were coated by two types of slurries: one formed by MgO and water and other formed by MgO, water and SrSO4. The ceramic f
Externí odkaz:
https://doaj.org/article/4f6f9c5b10644428b52fa672ffe5d216