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Publication Open Access The potential of copper alloy as alternative material for post and core applications.(2014-09) Somchai Urapepon; สมชาย อุรพีพล; Usanee Peungpaiboon; อุษณีย์ ปึงไพบูลย์; Somchai Urapepon; สมชาย อุรพีพล; Mahidol University. Faculty of Dentistry. Department of ProsthodonticsObjective: The purpose of this study was to investigate the use of copper alloy for dental application. Materials and methods: Three types of copper alloy used in Thailand were selected (Cu-Al, Cu-Al-Ni and Cu-Zn). Ingots of these three alloys....2% proof stress, percentage of elongation after fracture and modulus of elasticity were calculated from tensile stress-strain curves. Six specimens for each test were made from each alloy. Results: The percentage of elongation of Cu-Al, Cu-Al-Ni and CuPublication Metadata only Properties of experimental copper-aluminiumnickel alloys for dental post-and-core applications(2014-01-01) Apiwat Rittapai; Somchai Urapepon; Julathep Kajornchaiyakul; Choltacha Harniratisai; Mahidol University; National Metal and Materials Technology Center (MTEC)(595.9 ± 14.2 MPa) was shown in the Cu-12Al-4Ni alloy. The tensile strength was increased as the both elements increased. Alloys with 3-6 wt% Al exhibited a small amount of 0.2% proof strength. Accordingly, the Cu-9Al-2Ni and Cu-9Al-4Ni alloys not only... copper alloys with variants of 3, 6, 9, 12 wt% Al and 0, 2, 4, 6 wt% Ni were prepared and casted. Their properties were tested and evaluated. The data of thermal, physical, and mechanical properties were analyzed using the two-way ANOVA and Tukey's testPublication Metadata only Hydrogen-free hydrogenation of furfural to furfuryl alcohol and 2-methylfuran over Ni and Co-promoted Cu/γ-Al2O3 catalysts(2021-04-01) Munsuree Kalong; Plaifa Hongmanorom; Sakhon Ratchahat; Wanida Koo-amornpattana; Kajornsak Faungnawakij; Suttichai Assabumrungrat; Atthapon Srifa; Sibudjing Kawi; Chulalongkorn University; Thailand National Nanotechnology Center; National University of Singapore; Mahidol Universityin comparison with the monometallic CuAl, NiAl, and CoAl catalysts. The XRD analysis confirmed the generation of Ni-Cu and Co-Cu alloys after the reduction in presence of H2. The interaction between Cu and Ni or Co resulted in a simplicity of the reduction...Catalytic transformation of furfural to furfuryl alcohol and 2-methylfuran without H2 supply toward transfer hydrogenation process using 2-propanol as a H2 source was systematically investigated over the bimetallic NiCuAl and CoCuAl catalystsItem Metadata only Development of Cu-Al-Ni alloy for dental post and core application(Mahidol University. Mahidol University Library and Knowledge Center, 2023) Apiwat Rittapai; Somchai Urapepol; Widchaya Kanchanavasita; Kallaya Suputtamongkolaffordable to patients. Sixteen groups of experiment alloys, with varying proportions 0, 3, 6, 9 wt % Al and 0, 2, 4, 6 wt % Ni, were prepared and their properties were evaluated. As generated by the biocompatibility characteristic, the 6 wt % Ni series...Generally, the technique used for replacement of the tooth is "posts and cores". Noble and semi-precious dental alloys have numerous excellent properties, but they are expensive and unaffordable for lots of patients. The copper-aluminum-nickel alloyPublication Open Access Surface hardness of Thai spherical amalgam product.(2015-01) Pornkiat Churnjitapirom; พรเกียรติ ชื่นจิตอภิรมย์; Chayada Teanchai; ชญาดา เทียนไชย; Anucha Sacharoen; อนุชา ซาเจริญ; Anucha Sacharoen; อนุชา ซาเจริญ; Mahidol University. Faculty of Dentistry. Research OfficeObjective: The purpose of this study was to compare the surface hardness of Thai spherical amalgam product (N’SURE) with three commercial spherical amalgams (Tytin FC®, Amalcap® Plus, and GS-80 spherical). Materials and methods: Ten specimens were prepared from each of four spherical amalgams and then stored at 37°C for 24 hours. The surface of each specimen was polished using SiC paper (P240 to P4,000) and finished using alumina particles (average particle size, 0.05 µm). Surface hardness was then measured using Vickers hardness test under 1 kgf load for 15 seconds. The data were statistically analyzed using One-way ANOVA and Tukey’s multiple comparison test at 95% confidence interval. Results: The surface hardness of all spherical amalgams ranged from 127.77 to 158.51 HV1. Significant differences in surface hardness were found among all spherical amalgams. The highest was GS-80 spherical followed by Tytin FC®, Thai amalgam, and the lowest was Amalcap® Plus. Conclusion: The result of this study showed that surface hardness of Thai spherical amalgam product is comparable to commercially available spherical amalgams.Publication Open Access Physicochemical properties of nanoparticles titania from alcohol burner calcination(2011) Supan Yodyingyong; Chaiyuth Sae-Kung; Bhinyo Panijpan; Wannapong Triampo; Darapond Triampo; Rajabhat Maha Sarakham University. Faculty of Education; National Science and Technology Development Agency; Mahidol University. Institute for Innovation and Development of Learning Process; Mahidol University. Faculty of ScienceThe physicochemical properties of synthesized TiO2 nanoparticles from integrating sol-gel with flame-based techniques were studied. The synthesized nanoparticles properties were compared after using methanol, ethanol, and propanol fuel sources. The synthesized TiO2 were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermal analysis (thermogravimetric analysis, TGA, and differential scanning calorimetry, DSC), and surface area Brunauer–Emmett–Teller (BET) method. The photocatalytic activity of TiO2 nanoparticles was investigated by measuring the degradation of methylene blue. It was found that methanol and ethanol burners can be used as an alternative furnace that can yield TiO2 nanoparticles with physicochemical properties comparable to that of commercial TiO2 nanoparticles, while a propanol burner cannot be used as an alternative fuel.