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Study on the Mineralization and Mechanism of Nano Hematite Crystals on the Affection of Organism Matrix

Author: ZhouHongJian
Tutor: GaoYanMin
School: Jiangsu University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Biomineralization Ferric hydroxide gel Phase change Ferric oxide Biomimetic
CLC: P573
Type: Master's thesis
Year: 2010
Downloads: 156
Quote: 0
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Abstract


Biomineralization of iron found in biological mineralization than late, but a very important class. Changes in iron minerals great impact on the geochemical nature of its environment. Iron oxide because it has stable chemical properties and a higher specific surface area, good adsorption performance, overcast, migration and precipitation of the cation, heavy metal ions and an organic chelating agent in the environment have a major impact, particularly iron oxides (such as magnetic, hematite) directed film deposition applications in the field of information storage materials are being developed, and therefore has a very important significance. Therefore, in this paper, based on the principles of biomineralization study the soluble organic matter and insoluble mineralization process of organic matter in the regulation of iron hydroxide gel bionic preparation of nano ferric oxide crystal has important theoretical significance. The research results obtained are summarized as follows: First, by selecting a different pH, the anion, a different precipitating agent, different solvents and other conditions to alter mineralization of the iron hydroxide gel, to thereby obtain the most beneficial iron sesquioxide the conditions of the formation of crystals; optimal mineralization under conditions, as a template and the guide of the crystal growth agent to the soluble organic matter (sodium polyacrylate), regulation of iron hydroxide gel mineralization Biomimetic ferric oxide crystals. The purpose is to study the soluble organic matter of the regulation and its mechanism of iron hydroxide gel mineralization behavior, the results showed that the pH, anion, precipitating agent of the mineralized system, as well as the type of solvent can affect the mineralization behavior of iron hydroxide gel; and under optimal conditions of mineralization, soluble organic matter polypropylene sodium control mineralization product by selecting the nucleation and phase transition mechanism of crystal type, morphology, nature and growth pattern. Optimal mineralization under conditions to insoluble organic matter (chitosan and polyvinyl alcohol) as a template of the crystal growth, the mineralization process of the regulation of iron hydroxide gel Biomimetic ferric oxide crystals. The purpose is to study regulation of ferric hydroxide gel mineralized behavior of soluble organic matter and its mechanism, the results show that the functional groups on dissolved organic carbon molecules exist periodic structure, exists between the mineral crystals organic - inorganic interface matching can effectively reduce the crystal nucleation of the potential energy barrier, to control nucleation of mineral crystals, and phase transformation process. 3 analog biomineral formation process in the soluble organic matter and insoluble organic matter synergies, the regulation of iron hydroxide gel mineralization Biomimetic ferric oxide crystals. Study organic matter and its mechanism of synergistic regulation of ferric hydroxide gel mineralized behavior, the results show that the role of different types of organic matter in the process of the formation of mineral crystals, insoluble organic matter as a template by organic - inorganic interface matched control mineral crystal nucleation and crystal phase transformation process; soluble organic matter adsorption in the mineralization process, and mineralization product control the crystal orientation of the surface of mineral crystal growth and aggregation, the synergy between the two jointly controlled iron hydroxide gel type , morphology, nature and growth mode. 4 Using the principle of molecular dynamics, the interaction between the sodium by molecular simulation technology to simulate polypropylene and polyvinyl alcohol and ferric oxide crystals. Organic matter control the crystal growth mechanism of action is understood at the atomic level, the results show that the polyvinyl alcohol and ferric oxide, the surface of the crystal (110) the presence of a strong interaction, the presence of water molecules can be increased between the sodium polyacrylate and trioxide iron crystals (104) plane of the binding, and promote the growth of crystals of iron sesquioxide, polyvinyl alcohol and between the (104) plane of hematite (110) plane between the force and polypropylene sodium with hematite forces are Coulomb force and the van der Waals force, they play a role in promoting the combination of organic matter with the crystal surface.

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CLC: > Astronomy,Earth Sciences > Geology > Mineralogy > The structure of minerals
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