ERU - 2011

Permanent URI for this collectionhttp://192.248.9.226/handle/123/14688

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Browsing ERU - 2011 by Author "Adikary, SU"

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    item: Conference-Extended-Abstract
    Effect of deacetylation conditions on synthesis of chitosan using shrimp type "penaeus monodon"
    (2011) Adikary, SU; Samarasekara, AMPB; Unagolla, JM; Wijesinghe, WARP
    In this study synthesis of chitosan from shrimp type penaeus monodon and effect of degree of deacetylation conditions were studied. Chitin was extracted from shrimp shells and deacetylation process was done to synthesize chitosan under different conditions. Characterization of the synthesized chitosan was done using Fourier Transmission Infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The effect of NaOH concentration, reaction temperature, and reflux time on the deacetylation process was investigated. Degree of deacetylation of chitosan was determined using infrared spectroscopy technique. Mainly, the increasing of NaOH concentration, temperature, number of deacetylation time and reflux time can enhance the degree of deacetylation (DD) of chitosan.
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    item: Conference-Extended-Abstract
    Effect of Reflux temperature on synthesis of hdroxyapatite by wet chemical precipitation technique
    (2011) Adikary, SU; Jayaweera, JMN; Sewvandi, GA
    In this study, hydroxyapatite HA, [(Ca>o(P04)6(OHi:,j] was synthesized using wet chemical precipitation technique at different reflux temperatures. Calcium hydroxide [Ca(OH)J powder and Phosphoric acid [H3PO4] solution were used as starting materials. Variation in PH value of Ca(OHsuspension during the addition of H}P04 solution was analyzed. The effect of reflux temperature for the synthesis HA was investigated. Characteristics of synthesized powder were analyzed by Fourier transformed infrared (FTIR) spectroscopy and X-ray dijfraction (XRD). The powder characteristic has demonstrated that, the reflux temperature played an important role in the synthesis of pure and single phase HA powder.
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    item: Conference-Abstract
    Effects of clay characteristics on fabrication and glazing behavior of ceramic products from Tissamaharama red clay
    (2011) Adikary, SU; Jayawardena, JTST; Gunawardane, U
    In this research work, clay deposits located at Tissamaharama region vrcji investigated for mineralogical characteristics and to identify suitable fabrication and glazing techniques. The samples were collected from a site where clay mining is been already done for the pottery industry. X-ray diffraction (XRD) analysis and chemical analysis were used to determine the mineralogical characteristics of the clay samples. XRD analysis of the clay samples showed the presence of Quartz, phyrophyllite and montmorillonite. Chemical analysis indicated the presence ofCaO, Fe:(),, Si02 and AljOj. The Tissamaharama clay belongs to montmorillonite-kaolinite group with calcareous material and hence this clay could not be effectively deflocculated. Therefore slip-casting technique is not possible as a fabrication technique. Alternatively hand throwing on the potter's wheel or jiggering could be effectively used as a fabrication method. The actual size samples, made by hand throwing on the potter's wheel exhibited good properties. For fabrication of glazed red clay items, it was observed that the coefficient of thermal expansion of clay was lower than commercially available leadless low maturing glazes. However by adding sufficient amount of quartz to the clay, coefficient of thermal expansion can be improved.