MESII - 2023

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

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Browsing MESII - 2023 by Author "Galhenage, AS"

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    item: Conference-Abstract
    Effect of process parameter on the extraction of nano CaO powder from eggshells
    (Department of Materials Science and Engineering, University of Moratuwa., 2023-07-28) Weerakoon, WAKN; Udawala, RDNSS; Galhenage, AS; Sivahar, V
    In recent years, the use of nanoparticles as fertilizers has gained significant attention due to their unique physicochemical properties and their ability to enhance plant growth and productivity. The extraction of nano CaO from eggshells waste to synthesize nano fertilizer represents a pioneering advancement in sustainable development, agriculture, and nano technology. As waste reduction and sustainable resource management emerge as crucial priorities for an environmentally conscious and resource-efficient society, the effective utilization of waste materials becomes imperative, offering opportunities to extract valuable resources while minimizing environmental impact. In this study, CaO nanoparticles were synthesized by the thermal decomposition and grinding of eggshell waste. The effect of synthesis process variables, namely, the grinding method (dry milling, wet milling), the grinding time, the calcination time, and the calcination temperature was investigated. Egg shell powder as well as synthesized CaO were characterized using TGA, SEM, XRD and FTIR. The highest CaO yield, and reduced particle size were given with wet milling for 1 hour followed by calcination at 900°C for 3 hours.
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    item: Conference-Abstract
    Synthesis of fluoride-containing varnish for dental caries
    (Department of Materials Science and Engineering, University of Moratuwa., 2023-07-28) Mendis, WVH; Madushan, NLC; Herath, EMUCK; Galhenage, AS; Sivahar, V
    Fluoride-containing varnishes are applied on teeth surfaces to prevent forming of dental caries and to treat already available caries, especially in children. Dental caries is permanent damage or decay caused by the development of tiny holes in the tooth enamel due to the demineralization of the tooth. Fluoride is a mineral, and it helps in preventing tooth decay. Sri Lanka imports fluoride-containing varnishes. However, due to the economic meltdown, there are limitations on imports. It is crucial to manufacture these kinds of products locally for the development of the country. In this study, a fluoride-containing varnish is synthesized and characterized. The laboratory-synthesized varnish has 4A grade adhesion and 4.6 minutes of set-to-touch time. Furthermore, the teeth surfaces before and after applying the varnish were analyzed using Energy-Dispersive X-ray spectroscopy (EDX) and Scanning Electron Microscopy (SEM). The porous structures of the demineralized teeth are clearly observed. Fluoride adsorption to the tooth surfaces is about 5.53%.