title: Controlled growth of calcium oxalate crystal in bicontinuous microemulsions containing amino acids.
abstract: The growth of calcium oxalate (CaC(2)O(4)) 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 CaC(2)O(4) crystals in the microemulsions containing Asp.
authors.affiliation: School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China. s_yuhua@163.com
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Shen
authors.forename: Shikuo
authors.initials: S
authors.lastname: Li
authors.forename: Anjian
authors.initials: A
authors.lastname: Xie
authors.forename: Wanghua
authors.initials: W
authors.lastname: Xu
authors.forename: Lingguang
authors.initials: L
authors.lastname: Qiu
authors.forename: Hui
authors.initials: H
authors.lastname: Yao
authors.forename: Xuerong
authors.initials: X
authors.lastname: Yu
authors.forename: Zhangxu
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000596:Amino Acids; D002129:Calcium Oxalate / Q000737:chemistry*; D003460:Crystallization; D004655:Emulsions
chemical_list: D000596:Amino Acids; D004655:Emulsions; D002129:Calcium Oxalate