• M S Joshi

      Articles written in Bulletin of Materials Science

    • Nucleation and growth of potassium dihydrogen phosphate crystals in silica gels

      M S Joshi A V Antony

      More Details Abstract Fulltext PDF

      Kinetic studies on nucleation and growth of potassium dihydrogen phosphate crystals in silica gels show that the rate-determining process for the growth of these crystals in silica gels is diffusion. Morphology, microhardness and perfection of gel grown crystals are also reported.

    • Surface structures on second order prism faces of synthetic quartz crystals

      M S Joshi K B Saraf A V Antony

      More Details Abstract Fulltext PDF

      Surface structure studies on various {1120} (second order prism) faces of synthetic quartz crystals are reported. Horizontal striations and polygonal growth pyramids are predominant on these faces. Growth layers modified by the presence of guest microcrystals attached to the host second order prism faces are illustrated and explained. It is shown that microcrystals and impurities influence growth and development of second order prism faces of synthetic quartz crystals. Mechanism of growth of these faces is assessed in the light of the observed surface structures.

    • Growth of single crystals of some complex salts in silica gels

      M S Joshi P Mohan Rao A V Antony

      More Details Abstract Fulltext PDF

      Single crystals of ammonium nickel sulphate, potassium nickel sulphate, ammonium alum and potassium alum are grown in sodium-metasilicate gels. The method of gel preparation and growth procedure are described. Both single diffusion and double diffusion methods are used. Studies on nucleation and characterisation of crystals are also reported. Crystals grown are illustrated.

    • Growth and characterization of hydrothermally-grown zeolite crystals

      M S Joshi B T Bhoskar

      More Details Abstract Fulltext PDF

      Studies on hydrothermal synthesis of zeolite crystals, in Na2O-Al2O3-SiO2-H2O system, are reported. Experimental procedure and growth parameters are briefly described. Cube-like and rod-like crystals (called VSZ-1 and VSZ-2) are illustrated. It is established that VSZ-1 crystals are metastable, while VSZ-2 crystals are stable. Crystallanity of these two samples is established. Observations and results of characterization of these two varieties by TEM, SEM, electron microprobe and infrared methods are described, illustrated and interpreted. The role of Si/Al ratio is explained.

    • Hydrothermal transformation of clinoptilolite

      M S Joshi V V Joshi

      More Details Abstract Fulltext PDF

      Procedure for hydrothermal transformation of natural clinoptilolite at 160°C is described. The synthesis is carried out in the system Na2O-Al2O3-SiO2-H2O. Products of 24–168 hr runs are characterized by x-ray diffraction,ir spectroscopy, energy dispersive analysis of x-rays (edax), and electron microscopy. Presence of analcime-type and faujasite-type zeolites in the final products is established. Si/Al ratio of the final mixed phase is estimated as 2·91. Spheroid crystals of analcime, fibrous crystals of mordenite (on analcime), and well developed polyhedral crystals of analcime-faujasite mixed phase are illustrated and described. It is shown that crystals grow by two-dimensional nucleation mechanism.

    • Synthesis and characterization of mordenite crystals

      M S Joshi K Mohan Prabhu

      More Details Abstract Fulltext PDF

      The hydrothermal synthesis of large port mordenite crystals and experimental observations are reported. Unit cell parameters are estimated asa = 18·142,b = 20·328 andc = 7·508 Å. Prismatic and prismatic pyramidal mordenite crystals are illustrated. The average particle size computed was 8–20µ. Adsorption capacities of synthesized mordenite crystals are 13·4% for water, 9·9% for methanol and 5·8% for benzene by weight.

  • 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

© 2021-2022 Indian Academy of Sciences, Bengaluru.