http://dr.lib.sjp.ac.lk/handle/123456789/1144 2025-12-29T02:32:10Z 2025-12-29T02:32:10Z Hapuhinna, H.K.G.K.D.K. Gunaratne, R.D. Pitawala, H.M.J.C. http://dr.lib.sjp.ac.lk/handle/123456789/12716 2023-04-06T10:22:40Z 2019-01-01T00:00:00Z

Synthesis of bone cement from a natural mineral for biomedical industry Hapuhinna, H.K.G.K.D.K.; Gunaratne, R.D.; Pitawala, H.M.J.C. Study carried to find out chemical and structural suitability of newly synthesized Eppawala Hydroxyapatite composite as bone cement, by comparing and contrasting it with human bone as well as commercially available bone cement, which is currently used in orthopedic surgeries. Therefore, a mixture of commercially available bone cement and its liquid monomer, commercially available Methyl Methacrylate (MMA) and a mixture of Solid State synthesized Eppawala Hydroxyapatite powder with commercially available MMA were prepared as the direct substitution for bone cement. Then physical and chemical properties including composition, crystallinity, presence of functional groups, thermal stability, surface morphology, and microstructural features were examined compared to human bone. Results show there is a close similarity between synthesized product and human bone while credenting high thermal stability, good crystalline, and porous properties than the commercial product. Finally, study concluded newly synthesized composite can be applied directly as a substitution for commercial bone cement.

2019-01-01T00:00:00Z Hapuhinna, H.K.G.K.D.K. Gunaratne, R.D. Pitawala, H.M.J.C. http://dr.lib.sjp.ac.lk/handle/123456789/12714 2023-04-06T10:19:18Z 2019-01-01T00:00:00Z

A novel approach of synthesizing 2-hydroxyethyl methacrylate embedded hydroxyapatite composites for dentistry applications Hapuhinna, H.K.G.K.D.K.; Gunaratne, R.D.; Pitawala, H.M.J.C. This research focused to find out chemical and structural suitability of novel Hydroxyapatite composite synthesized using Chloroapatite and 2-hydroxyethyl methacrylate as Dental filling material. For that, Solid State Sintering technique was used to produce Hydroxyapatite using Sri Lankan Chloroapatite and Calcium hydroxide. After reinforcing it with 2-hydroxyethyl methacrylate, physical and chemical properties were examined via comparing and contrasting it with the human tooth and commercially available Glass Ionomer cement (GIC), used in the field of Dentistry. Results show there is a close similarity between the synthesized product and the human tooth. Therefore, the study concluded that synthesized Hydroxyapatite composite can be used directly as a substitution for commercial dental filling material

2019-01-01T00:00:00Z Hapuhinna, H.K.G.K.D.K . Gunaratne, R.D. Pitawala, H.M.J.C. http://dr.lib.sjp.ac.lk/handle/123456789/12713 2023-04-06T09:44:33Z 2019-01-01T00:00:00Z

Synthesis of Hydroxyapatite 2-Hydroxyethyl Methacrylate Blended Material for Dentistry Hapuhinna, H.K.G.K.D.K .; Gunaratne, R.D.; Pitawala, H.M.J.C. As a bio ceramic hydroxyapatite and its composites have applied in several biomedical applications. This research used to examine suitability of Hydroxyapatite 2-hydroxyethyl methacrylate composite for dentistry. Sri Lankan chlorapatite, ethanol and dil. acid used to synthesize hydroxyapatite by sol gel technique and then it was reinforced with polymer prior to compare and contrast it’s chemical and physical properties with human tooth and commercial dental filling material. Results show there is a close similarity between newly synthesized product and human tooth. It has credent high thermal stability, good crystalline and porous properties than the commercial product. At the end, the study concluded that the new material can be used directly as a substitution for human tooth.

2019-01-01T00:00:00Z Hapuhinna, K. Gunaratne, R.D. Pitawala, J. http://dr.lib.sjp.ac.lk/handle/123456789/12712 2023-04-06T09:32:36Z 2022-01-01T00:00:00Z

Thermal Mechanical Property Enhancement with Silicon Carbide Ceramic Filled Composites for Industrial Applications Hapuhinna, K.; Gunaratne, R.D.; Pitawala, J. Epoxy composites with glass fiber reinforcement can be found in the automotive and aer‐ ospace industries. In this study, the properties of the epoxy matrix were enhanced by processing composites filled with ceramic particles of silicon carbide (SiC). At first, SiC‐filled E‐glass fiber‐re‐ inforced epoxy composites/sandwich structures were processed using the hand layup technique. Next, processed composites were characterized using a tensile tester and an Izod impact tester to determine the best mixing ratio of ceramic‐embedded epoxy composites. The highest mechanical properties were obtained according to ASTM D638 and D256 standards. Next, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), x‐ray diffraction analysis (XRD), analysis of differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) were carried out respectively to find out the presence of functional groups, surface morphology, crystal‐ lographic structure, glass transition temperature (Tg) and thermal/material stability of processed composites. In the end, the study elaborates that the mechanical properties of epoxy matrix compo‐ sites were improved by the addition of SiC ceramic fillers, and among processed composites, 10%SiCE composite carried the highest properties, including the Tg value of 62.8 °C, 69.87 MPa for tensile strength and 57.12 kJ m−1 for impact strength.

2022-01-01T00:00:00Z