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Os depósitos de argilas plásticas para cerâmica branca ("ball clays") de alta qualidade não são comuns, estando localizados basicamente nos Estados Unidos e no Reino Unido. As "ball clays" são utilizadas em uma série de indústrias que vão desde a indústria cerâmica à de cosméticos. Assim, este trabalho tem por objetivo analisar argilas do tipo "ball clay" extraídas do litoral paraibano, realizando sua caracterização para fins cerâmicos. Sua caracterização foi realizada por meio da determinação da massa específica real, CTC, área superficial (BET), distribuição granulométrica, composição química, ATD/ATG, DRX e MET. Após caracterização, foram conduzidos ensaios tecnológicos para fins cerâmicos com as amostras. Com base nos resultados pode-se concluir que as amostras são argilas basicamente cauliníticas com queima branca em temperaturas de 1250 ºC e 1450 ºC. Além disso, apresentaram propriedades físico-mecânicas dentro das faixas indicadas na literatura para "ball clays" utilizadas em tecnologia cerâmica.

A indústria do beneficiamento de granito gera uma enorme quantidade de rejeitos, que poluem e degradam o meio ambiente. Assim este trabalho tem por objetivo caracterizar e avaliar as possibilidades de utilização dos rejeitos da serragem de granitos gerados pelas indústrias de beneficiamento da Região Nordeste, como matéria-prima cerâmica alternativa na produção de blocos e revestimentos cerâmicos. Foram coletadas amostras de resíduos da serragem de granito em empresas da Paraíba, Ceará e Pernambuco, em seguida foi realizada sua caracterização através da determinação da distribuição granulométrica, massa específica real e área específica (BET) e de análise química, ATD, ATG, DRX, MEV. Após caracterização foram conduzidos ensaios tecnológicos com composições cerâmicas a fim de avaliar a possibilidade de adição dos resíduos em massas cerâmicas para confecção de blocos e revestimentos cerâmicos. Com base nos resultados verificou-se que os resíduos apresentam características físicas e mineralógicas semelhantes as das matérias-primas cerâmicas convencionais e que corpos cerâmicos formulados com resíduos apresentam características dentro das especificações da normalização brasileira tanto para blocos como para revestimentos cerâmicos.

Titanium dioxide (TiO2) has attracted interest for sensory applications due to its high surface area and the high density of active adsorption sites. This review shows the effect of the nanostructure, synthesis technique, operating temperature, target gas, and the impact of incorporating metallic elements on the detection properties of TiO2. The studies showed that the TiO2 gas detection process is closely related to surface reactions. Therefore, sensing properties, such as sensitivity, response time, and recovery, vary with factors that influence the surface reactions, such as chemical elements, morphology, microstructure of the depletion layer, and operating temperature. [ABSTRACT FROM AUTHOR]

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ceramica is the property of Associacao Brasileira de Ceramica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)