MERCon - 2022
Permanent URI for this collectionhttp://192.248.9.226/handle/123/18494
Browse
Browsing MERCon - 2022 by Author "Adikary, SU"
Now showing 1 - 3 of 3
- Results Per Page
- Sort Options
- item: Conference-Full-textEffects of kaolin with high silica content on properties of ceramic tiles(IEEE, 2022-07) Jayaweera, JMN; Narayana, M; Adikary, SU; Rathnayake, M; Adhikariwatte, V; Hemachandra, KIn general, Quartz, Feldspar, Ball Clay, and Dolomite are the main raw materials used in the tile industry. The availability of quality Ball Clay for the tile manufacturing industry has decreased over the years in Sri Lanka and the tile industry intends to substitute ball clay with another suitable clay. In this study, the New Kaolin source was investigated for the tile industry as the main clay mineral with Feldspar, Dolomite, and Bentonite Clay. Initially, new Kaolin clay was characterized using X-ray diffraction, wet chemical analysis, and differential thermal analysis. It consists of 56.78% of Silica. The body mix of the tiles was prepared and the Particle size distribution of the body mix was determined. The shape of the tiles was obtained using a powder pressing method. Samples were dried in an oven and fired in a muffle furnace at 1100°C, 1150°C, 1180°C, and 1200°C. Relationships between the physical properties of the fired tiles have been established. The improved physical properties of tiles at the firing temperature of 1200 0C complied with ISO 13006 standard. Based on this study, M2 Kaolin can be strongly recommended as a highly appropriate clay material for the ceramic tiles manufacturing industry in Sri Lanka.
- item: Conference-Full-textModeling and Validation of Nanoparticle Formation in Wet Chemical Synthesis of Nanohydroxyapatite(IEEE, 2022-07) Dhananjaya, GS; Madusanka, TGD; Adikary, SU; Rathnayake, M; Adhikariwatte, V; Hemachandra, KThe wet chemical synthesis of Nano-Hydroxyapatite HAP [Ca10(PO 4 ) 6 (OH) 2 ] derived from precursors Ca(OH) 2 and H 3 PO 4 was experimented using a kinetic model derived based on the classical nucleation theory. The model gives a mathematical formulation for the nucleation rate in terms of the process variables of the wet chemical synthesis namely supersaturation, temperature, and interfacial tension. Only the effect of supersaturation for nano formation was studied in the experimental work of this study. The different supersaturations for five different samples were initiated by changing the precursor concentrations keeping the Ca/P molar ratio at 1.6 to 1.7 in the solution being mixed. Finally, the model was statistically and experimentally validated using Fourier Transform Infrared Spectroscopy (FTIR) analysis, and data obtained by laser particle analyzer. This model can be potentially used to synthesize Nano-Hydroxyapatite particles in a quantitative manner changing the supersaturation of the wet medium by precursor concentrations.
- item: Conference-Full-textModelling and simulation of a vertically integrated zinc oxide piezoelectric nanogenerator(IEEE, 2022) Vithusan, T; Nashira, MNF; Adikary, SU; Rathnayake, M; Adhikariwattage, VDue to recent developments in energy harvesting, there has been a subsequent rise in MEMS (Micro electromechanical systems) powered by low-frequency vibrations in the environment through effective transduction procedures like piezoelectricity. In this paper, a vertically integrated single piezoelectric Zinc Oxide nanowire-based system is modelled for energy harvesting applications. To reinforce this development, different structures of nanogenerators were modelled and simulated using COMSOL Multiphysics 5.3 software for their performance upgrades. It was developed to analyse the compression and bending effect of the nanowire. To compare and validate the induced piezoelectric output, mathematical equations were derived using piezoelectric constitutive equations. Moreover, the voltage output of the nanowire under a constant lateral force was analysed varying with the nanowire dimensions in terms of aspect ratio. The analysis results have shown that the compression of ZnO nanowire gives more output voltage compared to the bending of the nanowire for the same nanogenerator. The theoretical and simulation results also prove that the length of the nanowire does not influence the piezoelectric potential in a lateral bent nanowire.