MESII - 2023

Permanent URI for this collectionhttp://192.248.9.226/handle/123/21214

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Browsing MESII - 2023 by Author "Adikary, SU"

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    item: Conference-Abstract
    Influence of particle size and crystallite size on hydroxyapatite nanoparticle degradation in pbs
    (Department of Materials Science and Engineering, University of Moratuwa., 2023-07-28) Anjana, JY; Arachchi, DHR; Adikary, SU; Sivahar, V
    In this study, we investigate the influence of particle size and crystallite size of Hydroxyapatite nanoparticles, synthesized using the wet chemical precipitation technique on degradation in Phosphate Buffer Saline (PBS). Different concentrations of calcium hydroxide and orthophosphoric acid were used for the synthesis process to achieve different supersaturations. The Ca/P molar ratio was kept at 1.67 while changing the supersaturation. The synthesized nanoparticles were characterized using a laser particle analyzer, Scanning Electron Microscope (SEM), X-ray diffractometer (XRD), Energy Dispersive X-Ray Analysis (EDAX), and Fourier- Transform infrared (FT-IR) spectroscopy to study their size, morphology, structure, and composition. The study demonstrated that controlling the precursor concentrations to induce varying supersaturation levels allows for the modulation of particle size and crystallite size of Hydroxyapatite nanoparticles, subsequently affecting the degradation behavior of HA, which is dependent on the particle size.
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    item: Conference-Abstract
    Modelling and simulation of nanogenerator using vertically integrated zinc oxide nanowire array
    (Department of Materials Science and Engineering, University of Moratuwa., 2023-07) Samaraweera, RLU; Buddhima, LHP; Adikary, SU; Sivahar, V
    Recent developments in nano-level energy harvesting are mainly focused on using piezoelectric power generators from compression and vibration modes. In this work, a vertically integrated zinc oxide piezoelectric nanowire array was modeled to scavenge energy from low-frequency compression force. COMSOL Multiphysics 5.4 software was used to simulate and model nanowire array structures to ensure the potential distribution and overall electric energy generator of the piezoelectric structure under compression displacement. Piezoelectric constitutive equations were used to develop mathematical equations in terms of comparing and confirming induced piezoelectric outputs. The simulation results confirmed that the voltage output of the nanowire array does not depend on the number of nanowires. Total electric energy harvested by the array depends on the number of nanowires and nanowire density.