Biomimetic Synthesis And Morphology Control Of CaCO₃

Biological organisms mineral is an important component of the material with the past do not have unique exquisite appearance,as well as the conventional composite materials unparalleled performance advantages.The focus of this paper is the use of biomimetic synthesis technology,the adoption of organic molecules and inorganic ions in the interaction interface to control the mineralization mechanism of the structure and morphology of calcium carbonate to form with a fine selection of the best growth-oriented material.In the experiment of using PEG to control the nano-calcium carbonate crystal form,the results showed that the length of calcium carbonate whiskers was 20³5?m.In this paper,polyethylene glycol?PEG?for the regulation of agents,by co-precipitation method we achieve the controlled synthesis of nanorods by chemical calcium carbonate.It shows that in the solution concentration of Ca²⁺and CO₃^2-play a key role in the formation of crystal of CaCO₃,the bigger the concentration of Ca²⁺and CO₃^2-involved?the more of Ca²⁺,the better the formation of crystals of CaCO₃ crystals.However,if the local concentration of Ca²⁺and CO₃^2-is too large,it will make both cut down,where the crystal growth rate is slower than the nuclear of crystal of CaCO₃,leading to the crystallinity of the crystal decreasing.Easy to get the structure of CaCO₃ determined by the concentration of polyethylene glycol.in the biomimetic synthesis high concentration in favor of calcite crystals,low concentration of aragoniteThe use of polyacrylic acid?PAA?and sodium dodecyl benzene sulfonate?SDS?as a regulatory agent,to achieve controlled synthesis of different morphologies of calcium carbonate.It showsthat the concentration of the reactantsinfluencethe morphology of nano calcium carbonate,decreasing the concentration of the reactants,the crystal morphology of CaCO3 also can be achieved from the globular flower to flower and then mainly spherical.The reaction temperature is higher in favor of aragonite-type calcium carbonate crystals,at low reaction temperature calcite crystals can be synthesized calcite crystals.When PAA concentration is large,the reunion of CaCO₃ crystal with flower clusters.The experimental results show that changing the reaction conditions can be prepared spherical,plum-shaped,star-shaped morphology of the nano-calcium carbonate and so on.Under hydrothermal conditions deep analysis of theinfluence of the different concentration of PEG,SDS,PAM,species of reactants,reaction time as well as in different phases.on the morphology of nano-calcium carbonate was carried out.Under optimal conditions,samples mostly revealed rhombohedral crystals of calcite or spindle,sometimes accompanied by spherical vaterite.