8.International Conference on Oleo and Petrochemical Engineering 2015
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Browsing 8.International Conference on Oleo and Petrochemical Engineering 2015 by Author "Amri, Amun"
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Item Influence of The Calcination Temperature And Ratio Of Cao/Hno3 On The Synthesis Of Precipitated Calcium Carbonate From Cockle Shell (Anadara Granosa)(2016-04-22) Purba, Paul Destin; Octavianty, Dhini; Amri, Amun; Zultiniar; YelmidaThe aim of this research is to synthesis the Precipitated Calcium Carbonate (PCC) from Anadara granosa cockle-sheell via carbonation method. The tested variables were the calcination temperatures (700oC, 800oC, and 900oC) and the ratios of between calcium oxide and nitric acid (14:300, 17:300, and 20:300 gr/m)l. The formed nitric calcium was then added by ammonia to pH 12 to start the synthesis of calcium hydroxide followed by flowing it with the carbon dioxide to form white precipitate (PCC). Based on the analysed, the best yield of PCC (84.88%) was obtained at calcination temperature of 900oC with the ratio of 14 gr:300 ml. The X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) characterizations revealed that the type of crystals formed was vaterit and the shape of crystals were round (sphere-like) with a relatively uniform in size, respectively.Item Synthesis of Copper Oxide Thin Film Via Sol-Gel Dip-Coating Route For Spectrally Selective Absorber Material(2016-04-22) Amri, Amun; Herman, SyamsuCopper oxide thin film coatings have been successfully coated on reflective aluminium substrates via facile sol–gel dip-coating route for spectrally selective absorber (SSA) application. For quantitatively analysis, the reflectance spectra obtained from UV-Vis-NIR and FTIR equiped with the integration spheres were used to measure the absorptance and emitance values, respectively. To optimize the performance, relevant parameters such as the concentration of sol precursor and the dip-drying cycle were investigated. The increase of the concentration of copper sol precursor in range of 0.1 - 0.3 M increased the absorptance value, likewise with the increase of the dip-drying cycles. The maximum absorptance of =72% with a spectrally selective absorber profile was achieved by a SSA material synthesized using 0.3 M copper nitrate, 0.3 M propionic acid, and 8 times dip-drying cycles. The emitance value of =6.63% for this coating was recorded. Good optical performance of spectrally selective absorber and the operational simplicity of the synthesis process make this coating have high prospect as spectrally selective absorber material