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  1. No Access

    Article

    Effect of temperature and frequency on the dielectric properties of cellulose nanofibers from cotton

    The present work has been carried out to evaluate the dielectric properties and ac-electrical conductivity of cellulose nanofibers. The cellulose nanofibers (CNF) described in this work are the ones extracted ...

    Jasmine Jose, Vinoy Thomas, Jancy John… in Journal of Materials Science: Materials in… (2021)

  2. No Access

    Article

    Effect of Structural Water on the Dielectric Properties of Hydrated Tungsten Trioxide

    Layered hydrated tungsten trioxide with orthorhombic phase is prepared by a hydrothermal method in an acidic environment. Dielectric studies reveal the presence of space charge and ionic polarizations in the a...

    M. Manuja, K. V. Sarath, Tintu Thomas, Joshy Jose… in Journal of Electronic Materials (2020)

  3. No Access

    Article

    Energy transfer and thermal studies of Pr3+ doped cerium oxalate crystals

    Energy transfer process at room temperature for cerium (sensitizer) oxalate single crystals doped with different concentrations (10, 13, 15, 17 and 20%) of praseodymium ions (activator) grown by hydro silica g...

    R. Pragash, Gijo Jose, N. V. Unnikrishnan… in Bulletin of Materials Science (2011)

  4. No Access

    Article

    An ultra-low hydrolysis sol-gel route for titanosilicate xerogels and their characterization

    In this work TiO2-SiO2 xerogels were prepared through an ultra low hydrolysis method using titanium and silicon alkoxide. The samples were heat treated to 500°C. The xerogels were characterized using TGA/DTA, FTI...

    Toney Fernandez, Gijo Jose, Siby Mathew… in Journal of Sol-Gel Science and Technology (2007)

  5. No Access

    Article

    Structural Evolution and Fluorescence Properties of Dy3+: Silica Matrix

    Silica glasses doped with Dy3+ were prepared by sol–gel method. The FTIR and thermo gravimetric analysis (TGA) clearly show complete densification (density = 2.2 gm/cm3) of the gels around 1000∘C. The fluorescenc...

    Vinoy Thomas, Gijo Jose, Gin Jose, P. R. Biju… in Journal of Sol-Gel Science and Technology (2005)

  6. No Access

    Article

    Optical Characterization of Eu3+ Ions in CdSe Nanocrystal Containing Silica Glass

    Silica glass samples containing CdSe/Eu3+ ions were prepared by sol-gel route. Size distribution and optical band gap of the nanoparticles were calculated from absorption spectrum. It is observed that the presenc...

    Gijo Jose, G. Jose, V. Thomas, C. Joseph, M. A. Ittyachen… in Journal of Fluorescence (2004)

  7. No Access

    Article

    Spectroscopic studies of Cu2+ ions in sol-gel derived silica matrix

    The Cu2+ ion doped silica gel matrices in monolithic shape were prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS). The absorption, transmittance and fluorescence spectra of the gel matric...

    P. I. Paulose, Gin Jose, Vinoy Thomas, Gijo Jose… in Bulletin of Materials Science (2002)