/ Beauty‚ Form and Function: An Exploration of Symmetry 1 TAN JUN RONG U1510605C 1 Writing Exercise – FePO4 Polymorphs Haines et al.‚ A neutron diffraction study of quartz-type FePO4: high-temperature behavior and α-β phase transition Z. Kristallogr. 218‚ 193-200 (2003). Paragraph 1 This writing exercise will be talking about how the structure of FePO4 will change from a low temperature of 294K to a high temperature of 1073K. There is a huge difference in both the cell parameters and atomic coordinates
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Tetraethoxysilane (TEOS‚ 99%)‚ chloropropyltriethoxysilane (CPTES‚ 99%)‚ absolute ethanol (EtOH‚ 99%) and other chemicals were purchased from Merck and Sigma Aldrich companies and used without further purification. Ciprofloxacin was purchased from Pars Daru Company. Preparation of modified magnetic silica NPs (Fe3O4@SiO2~Cl) Initially‚ the magnetic NPs prepared through a coprecipitation method and coated with a silica layer via a modified sol-gel method [20]. In brief‚ FeCl3.6H2O (0.036 mol) and
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two main industries that use it will be the removal of nitrogen oxides in industrial exhaust gas and for the catalytic cracking of heavy oil. Finally this catalyst is being characterized using three methods which are the infrared spectra‚ X-ray diffraction as well as the TGA and DTA methods. 2.0 Introduction Catalyst is a substance that causes the change in rate of a chemical reaction. This reaction is known as catalysis and unlike other reagents that take part in a chemical reaction
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amorphous‚ red selenium thin ®lms and their conversion to the hexagonal‚ gray modi®cation is presented. The method is based on deposition process from aqueous solution of selenosulfate by citric or ascorbic acid as oxidizing agents. The X-ray diffraction method is used for identi®cation of the deposited materials. Ultra-thin ®lms of both amorphous and hexagonal selenium are highly transparent in the Vis±NIR spectral region. # 2001 Elsevier Science B.V. All rights reserved. PACS: 81.15.-z; 81
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was done using attenuated total reflectance (ATR) method of Fourier transform infrared spectroscopy (FT-IR)‚ model Alpha-E‚ Bruker‚ Germany. For this study‚ samples were scanned with a scanning range of 4000-450 cm−1. 2.3. Powder X-ray diffraction study The X-ray diffraction (XRD) patterns of BNC I-III were obtained using Goniometer Miniflex‚ JAPAN with Cu Kα radiation‚ operating at 40 kV voltage and 30 mA current. Samples were analyzed in the 2θ angle range of 5-70o. 2.4. Size and morphological
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mixed together. Diffraction refers to various phenomena which occur when a wave encounters an obstacle. In classical physics‚ the diffraction phenomenon is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings. Isaac Newton thought that light must be a particle because particles of light that travels in straight lines until they are stopped by some object that blocks its path. When it is passed through a prism or a diffraction grating‚ the
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Chargaff’s rules‚ X-ray diffraction studies‚ and the use of brass and wire models of sugars‚ and phosphate groups. This revelation contributed heavily to scientific research and studies. They deduced that from their studies that DNA is structured in a Double Helix. With all of the evidence they accumulated they were able to achieve as well as build something great‚ with such a huge impact on the world. One piece of evidence they used to determine the structure of DNA was X-ray diffraction studies. X-ray
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The quartz type‚ iron phosphate‚ during structural evolution‚ was observed using neutron powder diffraction from temperature varying from 294K-1073K. The parameters of the α phase when it at relatively low temperatures moves towards values indicated by relatively high temperature β quartz type FePO4. Quartz exhibits a α-β phase transition at high
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need it. Some plants make more starch than others. Orange iodine solution is used to test for starch because it changes to a blue/black color if there is starch in the sample. Starch powder is a congealing agent used in cooking to thicken puddings‚ pie fillings‚ sauces‚ gravies and other liquids. The various powders are preferred over flour as a thickener because they are flavorless and dissolve easily in hot
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Electromagnetic Oscillations and Waves Diffraction and polarization of microwaves 4.5.06-00 What you can learn about … Diffraction Focal point Linearity Circularly and elliptically polarized waves Transverse waves Polarizer and Analyzer Constructive and destructive interference Principle: The equivalence between visible light and microwaves as special cases of the total spectrum of electromagnetic waves can be demonstrated using diffraction and polarization of microwaves as an example
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