• ATENEA JOSEFINA CHONG-SANTIAGO

      Articles written in Bulletin of Materials Science

    • Preparation and characterization of porous (Si$_{1−x}$Ti$_x$)O$_2$ ($x \leq 0.25$) prepared by sol–gel hydrothermal process

      ROBERTO MENDOZA-SERNA JOSÉ OCOTLÁN FLORES-FLORES MARINA CABALLERO-DÍAZ ATENEA JOSEFINA CHONG-SANTIAGO LUCILA VALDEZ-CASTRO ROBERTO YSACC SATO-BERRÚ

      More Details Abstract Fulltext PDF

      An experimental strategy was developed to obtain (Si$_{1−x}$Ti$_x$ )O$_2$ ($x \leq 0.25$) porous materials via the sol–gel hydrothermal process. The sol was prepared from Si(OEt)$_4$ (TEOS), Ti(OBu)$_4$ (OBu: OCH$_2$CH$_2$CH$_2$CH$_3$), anhydrous ethanol, deionized water and nitric acid. The reagents were mixed at room temperature (293 K) to obtain a homogeneous colourless liquid which was subjected to a hydrothermal process at 473 K using a stainless steel container. Finally, the material obtained was treated at 873 K in air. The surface area of the treated solids was determined by N$_2$ adsorption/desorption isotherms. The corresponding average pore diameter was evaluated using the Barret, Joiner and Halenda and Horváth-Kawazoe methods. Porous structures were obtained, in which the average pore diameter of the microporous ones was 1.4 nm. The characterization techniques employed were Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, Raman spectroscopy, scanning electron microscopy, thermal gravimetric analysis, differential scanning calorimetry and UV–Vis diffuse reflectance spectroscopy. The Si–O–Ti bonds were detected by FTIR.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.