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Research on Biomimetic Synthesis in an Aqueous Organic-additive System

Author: WangShuQiao
Tutor: PanLiJia；CaoJieMing
School: Nanjing University of Aeronautics and Astronautics
Course: Applied Chemistry
Keywords: Biomineralization Biomimetic synthesis Calcium carbonate Barium carbonate Barium sulfate Organic additives Crystal growth
CLC: TB391
Type: Master's thesis
Year: 2010
Downloads: 51
Quote: 0
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Abstract


Biological materials its special complex topography has unique features , its beautiful and reasonable structure , superior performance, higher mechanical properties than synthetic materials . Based on the principle of bio- synthetic organic - composite materials , and gradually attracted wide interest in academia and industry . This paper further development and rich analog Biomineralization Biomimetic synthesis of organic - inorganic biomaterial has a unique class of natural biological bionic structure of calcium carbonate , synthetic organic additives and control unstable crystalline phase are obtained significant progress . The use of the polymer molecules having a hydrophilic characteristic or other macromolecule with the complex structure of the part of the functional groups as crystal growth modifiers , by changing the experimental conditions to obtain a series of carbonate having a specific morphology , crystal type and ordered superstructure calcium composites. Obtain a specific study results are summarized as follows : 1. Triblock copolymer P123 of Mg 2 a mixed aqueous solution by controlling the reaction conditions , the CaCO 3 of particle shape regulation. Mg 2 concentration , reaction time, temperature and concentration of P123 the CaCO 3 < / sub > particle morphology and crystalline form . Using a scanning electron microscope ( SEM ) , X - ray powder diffraction (XRD) of the synthesized samples were characterized . The results show that the proportion of Mg 2 < / sup> and Ca 2 of CaCO 3 particle morphology and crystal form has important implications . This paper to BaCl 2 · 2H 2 O and Na , 2 CO 3 as raw material , the use of co-precipitation method synthesis of barium carbonate particles . By adding a suitable crystal form control agents , select the appropriate amount of synthesized the hollow hexagonal columnar barium carbonate particles , carried out a preliminary study and the formation mechanism of the hollow hexagonal columnar barium carbonate particles . Using polyacrylamide (PAM) for organic matter , the role of regulation by means of a single polymer , the the novel structure peanut -shaped BaSO 4 particles , PAM system of BaSO 4 < / sub> crystal growth .

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