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RISS 인기검색어
- 검색키워드
- 저자 : S. Manisha Vidyavathy (검색결과 4 건)
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Srinivasulu K,Manisha Vidyavathy S 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.1
Rare-earth zirconate (Re2Zr2O7, Re = La, Gd, Nd, Y) ceramic materials was synthesized by solid-state reaction methodthrough high-energy ball-milling process (HEBM) and subsequently followed by two different calcination techniques. Theimpacts of the two different calcination techniques on the phase structure, morphology, powder flowability (i.e. particle sizeand distribution, specific surface area, pore size and pore volume) were studied. The effectiveness of the calcination techniquesof the resulting Re2Zr2O7 powders were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy(FTIR), and Scanning electron microscopy (SEM) techniques. The outcomes demonstrated that both calcination techniquescould produce Re2Zr2O7 powders with an excellent pyrochlore structure. The calcination temperature was reduced by theMicrowave Calcination (MWC) technique when compared with the Conventional Calcination (CVC) technique. The rareearthzirconate powders exhibited different particle size distribution. The resulting particle median diameter was about 2.5-45 μm for CVC and 1.36-2.27 μm for MWC. The powder flowability of Re2Zr2O7 powders was strongly dependent on theparticle size and distribution. Thus MWC technique for the preparation of Re2Zr2O7 powders is the best choice of powderprocessing to achieve desired properties.
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Umapriya R,Manisha Vidyavathy S,Arthanareeswaran G,Rohan J,Poorna A R 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
The solution for water scarcity problem can be accomplished by treating the domestic & industrial wastewater with differenttreatment techniques. In this study, Polyethersulfone (PES) membranes were prepared with 0%, 0.25%, 0.5%, 0.75% and 1%wt% of SiO2 and ZrSiO4 as two different modifying agents. Phase inversion method is used for membrane preparation withN-methyl pyrolidone (NMP) as a solvent and Sodium Lauryl Sulphate (SLS) and water mixture as a non-solvent. Themorphology and pore size were analysed by Scanning Electron Microscopy (SEM). The crystallinity was verified with the helpof X-Ray Diffraction Techniques (XRD) and the identification of organic and inorganic groups were done using FourierTransform Infra-Red Spectroscopy (FTIR). The pure water flux rate analysis was carried out for all the membrane withvacuum filtration setup. The performance of the different membranes was analysed with tannery effluent and textile effluent. SEM image shows a two-layered structure where the top surface is porous followed with the homogeneous bottom surfacemembrane. The pore size and number of pores increased with the addition of inorganic materials. The results show that themoderate reduction in Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD),Total Dissolved Solids (TDS), chlorides etc.
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Effects of mullite gel on the properties of alumina castables
Simon Jeya Sunder Raj,S. Manisha Vidyavathy 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The bauxite-based refractory castables are made up of well-graded bauxite aggregate, binding matrix, and a sufficient amountof water. There are four mullite samples with various percentages of sol such as 2%,5%,7% and 10% were added to thealumina castables compositions. The conventional castables processing is carried out and after heat treatment the resultantproduct is characterized. Prepared castables are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy(SEM) and Differential scanning calorimetry (DSC) to obtain the structural properties, morphology, and thermal analysis,respectively. Enhanced properties were obtained for the mullite samples with 5% and 7% sols. Considerably improved flexuralstrength, modulus of rupture (MOR) and pH levels are obtained for the mullite gel composition but with a relatively lowerlevel of permanent linear change (PLC). Great refractory properties were achieved after sintering at 1300 oC due to thepresence of mullite in the bond phase with very slight CaO. This enables their use in various refractory applications such asin steel ladles, furnaces, kilns, incinerators, and reactors.
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A novel method: mixed matrix membrane – An overview
R Umapriya,J Rohan,S Manisha Vidyavathy,Thenmuhil,G Arthanareeswaran 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
The development of India into a modern country is slow but the population growth is rapid. Pure air, water and soil are thethree important things for a day to day life in the current scenario. Pure form of these three is must. Nowadays many waterresources, soils and air in the environment are polluted due to massive increase in population growth, industrialization andmodern Urbanization. The heavy metals, dyes, pesticides etc., are mainly polluting the water bodies. In current scenario theworld is in the need of treating water bodies, wastewater and sea water to reduce the water scarcity level. All wastewater andwater treatment processes possess at least one separation process in the treatment units. Membrane separation process isplaying a main role in the treatment process. In this study, the different types of conventional and advanced treatmentprocesses were discussed. Membrane treatment techniques, Types of membranes, materials which can be used for membranepreparation, advantages and disadvantages of each materials, performance of organic membrane (polymeric membrane),performance of inorganic membrane (ceramic membrane) and membrane fabrication methods were also discussed in thisstudy. To overcome the drawbacks, the new innovative idea was derived and discussed.
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