Carbon Ceramic
Mostrando 1-12 de 36 artigos, teses e dissertações.
-
1. Preparation of Silicon Oxycarbide (SiCO) Ceramics from Different Polymer Architectures and Assessment on the Performance as Electrodic Materials for Voltammetric Sensing of Antioxidant Phenolic Compounds
Silicon oxycarbide (SiCO) ceramics obtained from polymer pyrolysis and with varied carbon contents were prepared and evaluated as new electrodic materials for sensing of tert butylhydroquinone (TBHQ) and butylated hydroxyanisole (BHA) antioxidants. Three polymers were synthesized varying molecular architecture and aromatic carbon groups, followed by pyrolysi
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
2. Silica/Titania Graphite Composite Modified with Chitosan and Tyrosinase Employed as a Sensitive Biosensor for Phenolic Compounds
A mesoporous, high surface area and conductive silica/titania graphite composite modified with chitosan and functionalized with tyrosinase was prepared. The composite was obtained by the sol-gel method and the surface of the resultant material was modified with chitosan solutions containing 5, 10 and 15% by mass. The textural characterization showed that eve
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
-
3. Different Types of Lignocellulosic Materials for Energy Generation in the Ceramic Industry
ABSTRACT This work aims at the physicochemical characterization of four species: Eucalyptus sp, Pinus sp, Citrus sinensis and Hevea brasiliensis for use in ceramic furnace. Immediate analysis, chemical analyses were carried out (total extractives, Klason lignin, holocellulose and alpha-cellulose content). Results were applied to ANOVA and Tukey for statistic
Floresta Ambient.. Publicado em: 03/10/2019
-
4. Development of metakaolin and geopolymer proppants with nanocarbon materials
Abstract From the first hydraulic fracturing in the 40’s until nowadays, the techniques of each process step have evolved significantly. This study presents a new approach on the development of metakaolin (MK) and geopolymer based proppant with and without nanocarbon materials such as multi-walled carbon nanotubes and graphene oxide. For manufacturing the
Cerâmica. Publicado em: 2019-01
-
5. Fatiga de contacto por rodadura en acero SAE 1050 recubierto con TiN, posteriormente templado
ABSTRACT The use of ceramic coatings of the nitride, carbide, or diamond type on steel substrates promotes the improvement of tribology properties. Nevertheless, high hardness gradients and adhesion problems may deteriorate the performance of these coatings when subjected to Rolling Contact Fatigue (RCF). Some studies on steels with ceramic coatings were car
Matéria (Rio J.). Publicado em: 19/07/2018
-
6. Characterization of Niobia-alumina Deposited by the Sol-gel Process on Carbon Steel
The precursor sols of Al2O3 and mixed NbxOy/Al2O3 oxides were synthesized by the sol-gel process using acetylacetone to control the reaction kinetics of the organometallic oxides in the mixture. The layers of the precursor sols of Al2O3 and NbxOy/Al2O3 were deposited on AISI steel 1020 by manual immersion (dip coating). The lyophilized sols were characterize
Mat. Res.. Publicado em: 16/04/2018
-
7. IMOBILIZAÇÃO DE DIÓXIDO DE TITÂNIO EM DIFERENTES MATERIAIS SUPORTE PARA O EMPREGO EM FOTOCATÁLISE HETEROGÊNEA
The technological bottleneck for the application of heterogeneous photocatalysis with titanium dioxide (TiO2) is the retention and reuse of the catalyst, which brings opportunities for studying techniques for its immobilization on solid supports. The main objective of this paper was to test different methods to effectively immobilize TiO2 on granular activat
Quím. Nova. Publicado em: 2016-08
-
8. Production of porous ceramic materialusing different sources of alumina and calcia
ABSTRACTNumerous papers and publications report the use of microporous calcium hexaluminate (CaO.6Al2O3; CA6) as a key raw material for high temperature insulating materials. This material has unique properties with respect to chemical purity and mineral composition. Another important property of CA6 is its structure, which consists of platelet-shaped crysta
Matéria (Rio J.). Publicado em: 2015-09
-
9. Voltammetric determination of gabapentin by a carbon ceramic electrode modified with multiwalled carbon nanotubes and nickel-catechol complex
A técnica sol-gel foi usada na fabricação de um eletrodo cerâmico de carbono (CCE) renovável com complexo níquel-catecol (Ni-CA). O complexo foi depositado na superfície de nanotubos de carbono de parede múltipla-CCE por potencial cíclico na faixa de 0,0-0,8 V (vs. eletrodo saturado de calomelano, SCE). Ni-CA mostrou ter atividade catalítica sobre
J. Braz. Chem. Soc.. Publicado em: 2014-09
-
10. Construção de sensores eletroquímicos utilizando como matriz materiais cerâmicos SI O IND. 2 / M IND. X O IND. Y , e materiais cerâmicos eletricamento condutores SI O IND. 2 / C/ M IND. X O IND. Y , preparados pelo processo sol-gel / Construction of electrochemical sensors using ceramic materials SI O IND. 2 / M IND. X O IND. Y and electrically conducting ceramic materials SI O IND. 2 /C/ M IND. X O IND. Y as matrix, prepared for the sol-gel process
This work describes the synthesis and characterization of three different materials: SiO2/SnO2, SiO2/SnO2/Sb2O5 and the film of Nb2O5 formed on the surface of the ceramic material SiO2/C obtained by sol-gel process and to use them as matrix in the development of electrochemical sensors. The mixed oxides, SiO2/SnO2, were synthesized using as source of SnO2, S
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/04/2012
-
11. Elaboración de recubrimientos cerámicos mediante proyección térmica por combustión a partir de residuos sólidos industriales
Ceramic coatings were elaborated onto carbon steel substrates by oxy-fuel thermal spraying process from catalysts waste used in petroleum refining. The adhesion and micro-hardness Vickers were evaluated according to ASTM C633-01(2008) and ASTM C1327-08 standards respectively, with adhesion values varying between 2,9 and 17,7 MPa and values of microhardness V
Matéria (Rio J.). Publicado em: 2012
-
12. Síntese de catalisadores do tipo LaNixFe1-xO3 como precursores catalíticos para reação oxidação parcial do metano
Nickel-bases catalysts have been used in several reform reactions, such as in the partial oxidation of methane to obtain H2 or syngas (H2 + CO). High levels of conversion are usually obtained using this family of catalysts, however, their deactivation resulting from carbon deposition still remains a challenge. Different approaches have been tested aiming at
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011