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Because of its highly organized internal structure, chemical complexity, mechanical properties and optical effects, which create a characteristic and beautiful lustre, the formation of nacre is among the best-studied examples of calcium carbonate biomineralization.
The infrared absorption spectra of Pearl powder, shell powder and nanophase CaCO3 As can be seen from Fig. 2, shell pearl layer powder (both the nacre layer and prismatic layer) and pearl powder is basically the same, just as the absorption spectrum of nanophase calcium carbonate, that means that their structure and composition are similar to each other, most of the composition in the pearl and the shell layer are calcium carbonate.
On the micro structure of aragonite platelets, there are two viewpoints.
Conclusion Through the comparative analysis on the infrared absorption spectra of pearl, nacre layer and nanophase calcium carbonate, we can get the following conclusions: The infrared absorption spectra of pearl powder and nacre layer powder are consistent, indicating the composition and structure of pearl and nacre layer are similar.
Chinese journal of inorganic chemistry, 15 (1999) 715-720 [12] Takeshi Furuhashi, Clemes Schwarzinger, Ivan Miksik, Molluscan shell evolution with review of shell calcification hypothesis, Comparative Biochemistry and Physiology, Part B 154 (2009) 351–371

LiFePO4/Carbon composite doped by Al3+ ions was prepared by solid-state reaction process, and the structure and electrochemical properties of the resultant products were investigated.
Olivine structure of the composites at different dopant content was discovered by XRD patterns.
In this study, LiFePO4/carbon composite doped by Al3+ ions was prepared, and the structure and electrochemical properties of the resultant products were investigated.
X-ray powder diffraction with Cu Kα radiation, AEM-PHI5300 and RM2000 were used to characterize the structure of the resultant products.
Kroger: The chemistry of imperfect crystals (North-Holland, Amsterdam, 1964) [12] A.S.

The crystal structure and morphology of the samples were carried out by the X-ray diffraction (XRD) method (X’Pert, MPD, Philips) and scanning electron microscope (SEM, QUANTA 400, FEI), respectively.
Results and discussion The influence of n-propylamine concentrations on the crystal structure is presented in Fig. 1.
It was evident that the diffraction peaks of all samples exhibited a hexagonal wurtzite structure (JCPDS 36-1451).
From Table 1, it was observed that the ZnO powders can more damage the S. aureus than E. coli because the bacteria had different structures [2].
Conclusion The ZnO powders with hexagonal wurtzite structure were successfully prepared by precipitation method from n-propylamine-modified lithium hydroxide solution.

This is because the cellulose is thermally stable and thus, more heat energy is required to break down its crystalline structure and bonds.
The presence of reinforcement and/or crystalline structure may also act as a physical crosslink, deacreasing mobility of amorphous regions and increasing the composite stiffness [24].
Ibrahim: Asian Journal of Chemistry Vol. 22 (2010), p. 6652-6662
Liu: Agricultural and Food Chemistry Vol. 53 (2005), p. 9017-9022

Thus, the characteristics of crystal structure, crystal morphology, and mineral association will reflect the geo-environmental conditions when these minerals were formed to certain degrees.
The basic structure of palygorskite can be described as being composed of 2:1 ribbons that are linked to each other laterally by single basal oxygen.
The magnesium released from hydrolyses of chlorite provides the necessary chemistry for palygorskite to form.
New Development in research of crystal-chemistry and genesis of palygorskite.

Finishing Process of Modified Nano TiO2 Photocatalyst on Cotton Liming WANG1, 2 , Ying DING1, 2, Yong SHEN2 and Zaisheng CAI1, a 1College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China 2College of Fashion, Shanghai University of Engineering Science, Shanghai 201620, China azshcai@dhu.edu.cn (corresponding author) Keywords: Photocatalyst Finishing Agent; Modification; Cotton fabric Abstract: A series of modified nano-TiO2 photocatalysts, Nano PC, was applied to cotton fabrics through a pad-dry-cure process.
Because of the strong oxidizability of the photocatalyst, the fiber macromolecules can be easily broken so that the end group number of molecular chain of amorphous part of fiber increases and the supermolecular structure of the fiber weakens.
This was because the cross-linking agent is a multi-active compound and active groups can be interconnected under certain conditions, forming the film with mesh structure on the surface of the fiber or fabric, which to some extent hinders the reaction between photocatalyst and formaldehyde, leading to the result that the degradation rate of formaldehyde was slightly lower than that without the cross-linking agent.
Load of Nanometer TiO2 and its Application in Environmental Photocatalysis, Applied Chemistry. 21 (2004) 1087-1091

These devices essentially are tubular pressure vessels in which a controlled testing environment (pressure, temperature, coolant flow and chemistry, etc.) is created; the devices are inserted into the core of an experimental nuclear reactor to ensure the required radiation field.
The brazed joint is therefore exposed to the stress given by the fluid as noted above, and to the corrosion given by the local electro-chemistry.
Among the Ni brazing alloys, in present we use BNi-7 alloy (Cr 14%, P 10%) due to its features: eutectic formulation (liquidus and solidus coincidence at 8880C) which means easy flow right above the melting point, lower melting point than its wide-used ancestor BNi-2, ability to penetrate very narrow gaps (< 0.025 mm) and due to the literature [3] recommendations: “for the brazing of … thin-walled tube assemblies, and other structures that are used at high temperatures.
For the present, in Europe there is no standard or code to address for the peculiar situation, where some degree of embrittlement have to be accepted in pressurized irradiation devices, other than the French code RCC-MRx (Design and Construction Rules for Mechanical Components in high-temperature structures, experimental reactors and fusion reactors), with limited distribution and acceptance yet.

Water chemistry conditions were set for the corrosion tests in severe ways for corrosion times and corrosion temperatures with the initial oxygen concentration of about 1.72 wtppm.
Saito et al. carried out thermodynamic calculation to evaluate the potential-pH diagrams for metal/supercritical water system, diagrams of which have been widely used in LWR water chemistry to consider the corrosion product behaviour [8-10].
The oxide structures of both 1520S, 1520Ti and 1520Zr at 400℃ and 500℃ were similar.
The structure for 1520Ti corroded at 600℃ was composed of only magnetite.

X-Ray diffraction.The experiment of X-ray diffraction, it was found that most of the samples calcined in a furnace presented an amorphous structure of their silica, which shows that when calcined under appropriate conditions, even RHAs with high levels of impurities, may have an amorphous structure.
Rice hulls, Rice Chemistry and Technology.
Minnessota: American Association of Cereal Chemistry, 1972. p. 301-352

Rheological properties and Extrudate Swell of PHBV-bagasse composites Rapeephun Dangtungee1,2,a*, Suchart Siengchin1,2,b and Chayada Puritung3,c 1Materials and Production Engineering Program, Department of Mechanical and Process Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand 2Research Center of Nano Industries and Bioplastics, Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand 3Department of Industrial Chemistry, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand arapeephun.mme@tggs-bangkok.org, bsuchart.s.pe@tggs-bangkok.org, cchayada1309@hotmail.com Keywords: PHBV, Bio-composites, Bagasse, Polymer rheology Abstract.
The structure of surface modification treatment was showed in figure 1.
Fig. 1 Structure of chemical modification for surface treatment of bagasse Rheological measurement; The rheological behaviour of the various samples was obtained using a capillary rheometer (CEAST Rheologic 5000).
Acknowledgements The authors thank the office of the cane and sugar board (Ministry of Industry) for the financial support and also Department of Industrial Chemistry, Applied Science, King Mongkut’s University of Technology North Bangkok for experimental supports.