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Synthesis and Characterization of High Surface Area Transparent SiOC Aerogels from Hybrid Silicon Alkoxide: A Comparison between Ambient Pressure and Supercritical Drying.
Abebe, Adane Muche; Soraru, Gian Domenico; Thothadri, Ganesh; Andoshe, Dinsefa Mensur; Zambotti, Andrea; Ahmed, Gulam Mohammed Sayeed; Tirth, Vineet; Algahtani, Ali.
Afiliação
  • Abebe AM; Department of Materials Science and Engineering, School of Mechanical, Chemical and Material Engineering, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia.
  • Soraru GD; Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy.
  • Thothadri G; Department of Materials Science and Engineering, School of Mechanical, Chemical and Material Engineering, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia.
  • Andoshe DM; Department of Materials Science and Engineering, School of Mechanical, Chemical and Material Engineering, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia.
  • Zambotti A; Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy.
  • Ahmed GMS; Department of Mechanical Design and Manufacturing Engineering, School of Mechanical, Chemical and Material Engineering, Adama Science and Technology University, Adama P.O. Box 1888, Ethiopia.
  • Tirth V; Mechanical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia.
  • Algahtani A; Research Center for Advanced Materials Science (RCAMS), King Khalid University, Guraiger, P.O. Box 9004, Abha 61413, Saudi Arabia.
Materials (Basel) ; 15(4)2022 02 09.
Article em En | MEDLINE | ID: mdl-35207820
In this article, highly porous and transparent silicon oxycarbide (SiOC) gels are synthesized from Bis(Triethoxysilyl) methane (BTEM). The gels are synthesized by the sol-gel technique followed by both ambient pressure and supercritical drying. Then, the portion of wet gels have been pyrolyzed in a hydrogen atmosphere at 800 and 1100 °C. The FT-IR spectroscopy analysis and nitrogen sorption results indicate the successful synthesis of Si-O-Si bonds and the formation of mesopores. From a hysteresis loop, the SiOC ceramics showed the H1 type characteristic with well-defined cylindrical pore channels for the aerogel and the H2 type for the ambigel samples, indicating that the pores are distorted due to the capillary stress. The produced gels are mesoporous materials having high surface areas with a maximum of 1140 m2/g and pore volume of 2.522 cm3/g obtained from BTEM aerogels. The pyrolysis of BTEM aerogels at 800 °C results in the production of a bulk and transparent sample with a slightly pale white color, while BTEM xerogels are totally transparent and colorless at the same temperature. At 1100 °C, all the aerogels become opaque brown, confirming the formation of free carbon and crystalline silicon.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Etiópia

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Etiópia