Browsing by Author "Wickramasinghe, WAWIC"

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    item: Conference-Abstract
    Extraction and characterization of Nano Crystalline Cellulose (NCC) From Sri Lankan agricultural waste
    Wickramasinghe, WAWIC; Lasitha, DS; Samarasekara, AMPB; Amarasinghe, DAS; Karunanayake, L
    In this research synthesis and characterization of cellulose and nano cellulose and process run under several conditions to obtain parameters which are belongs to optimizing. Cellulose was extracted from BG 352 rice straw using de-waxing, delignification, hemicellulose and silica removal treatment. Extracted cellulose was characterized by Fourier transform infrared spectroscopic techniques (FTIR). SEM image showed that isolated cellulose fibers with diameter ranging from 2-8μm and yield of extracted cellulose are around 21%. Nanocellulose is the material at least one dimension in the nano meter range. The cellulose contains some amorphous regions as well as crystalline regions and by treating some strong acid such as sulfuric to broken up the cellulose from amorphous region. The resultant product is nanocellulose. Nano crystalline cellulose can be obtained from plant matter which comprises nano sized cellulose material. Nano crystalline cellulose synthesis was followed using cellulose by acid hydrolysis, quenching, centrifugation, dialysis, sonication, freeze drying process in this research. So locally available rice straw is a source to synthesize the nano crystalline cellulose.
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    item: Conference-Abstract
    Extraction of nanocellulose from Sri Lankan agricultural waste
    (Department of Materials Science and Engineering, 2019-01) Wickramasinghe, WAWIC; Lasitha, DS; Samarasekara, AMPB; Amarasinghe, DAS; Sivahar, V; Sitinamaluwa, HS
    Polymers are widely used in domestic and industrial applications because of their diverse functionality, lightweight, low cost and excellent chemical stability. They are mainly classified into naturally occurring or bio-based polymers and synthetic polymers. Bio-based polymers have the potential to replace petroleum-based.synthetic polymers and solve some of the most urgent problems caused by the overuse of petroleum-based polymers, such as environmental pollution especially water and soil pollution and harmful influence to human health. Rice is the major agricultural food and it is cultivated in all parts of Sri Lanka today. Rice straw is the waste product of the rice harvest. Rice straws have a considerable amount of cellulose. Cellulose is the mostly used bio-polymer material for various applications today. Nanocellulose is a light solid substance obtained from agricultural waste which comprises of Nano-sized cellulose fibrils. In this research, rice straw of BG 352 variety was collected from Polgahawela paddy cultivation area in Sri Lanka. Cellulose and nanocellulose materials were extracted from rice straw of BG 352 rice variety. Cellulose was extracted from rice straw using de-waxing, delignification, hemicellulose and silica removal treatments. Extracted cellulose was characterized by Fourier Transform Infrared spectroscopic techniques (FTIR). SEM images indicated that isolated cellulose fibers showed diameters ranging from 2-8|^m. Approximately 21wt. % of cellulose was extracted from the rice straw. Nanocellulose was extracted from cellulose by subjecting to acid hydrolysis, quenching, centrifugation, dialysis, sonication and freeze-drying processes. SEM images showed that extracted nanocellulose materials having 5-70 nm diameters. Therefore, Sri Lankan agricultural waste can be used as a source to synthesis value-added product of nanocellulose