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Controlled growth of calcium oxalate crystal in bicontinuous microemulsions containing amino acids
Authors:Shen Yuhua  Li Shikuo  Xie Anjian  Xu Wanghua  Qiu Lingguang  Yao Hui  Yu Xuerong  Chen Zhangxu
Institution:

aSchool of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China

Abstract:The growth of calcium oxalate (CaC2O4) crystal in water channels of three kinds of bicontinuous microemulsions, consisted of P-octyl polyethylene glycol phenylether (OP)/n-amyl alcohol/cyclohexane/water and above microemulsions containing tryptophan (Trp) or aspartic acid (Asp) has been studied. The products were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results indicated that both surfactant and amino acids all could prompt the growth of calcium oxalate monohydrate (COM) crystal, but the crystal morphology varied with the different microemulsions, pH values of the aqueous solution in channels and concentrations of the reactants. Various crystal morphologies such as butterfly-like, hollow and spiny spherical could be observed easily. A model of molecular identification – organized assembly – pervasion-combination balance was proposed to explain the formation mechanism of CaC2O4 crystals in the microemulsions containing Asp.
Keywords:Calcium oxalate  Crystal morphology  Amino acid  Biomineralization  Bicontinuous microemulsion
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