中文摘要：

详细研究了不同浓度的聚丙烯酸（分子量为2000，PAA-2k）和镁离子对碳酸钙在再生丝素蛋白（RSF）膜表面结晶的影响．发现单独采用PAA-2k时，碳酸钙主要以方解石形式在RSF膜表面沉积成膜；若加入一定量的镁离子参与共同调控，碳酸钙则有可能在RSF膜表面形成以文石为主的连续薄膜，进而得到了具有类珍珠质结构的层状RSF／文石复合材料．我们认为，吸附在RSF膜表面的PAA对碳酸钙成核诱导作用及其溶液中PAA对碳酸钙结晶抑制作用共同导致RSF膜表面碳酸钙薄膜的形成．

英文摘要：

The effects of the concentration of polyacrylic acid （Mw=2000, PAA-2k） and mole ratio of Ca^2＋/ Mg^2＋ on the crystallization of CaCO3 on the surface of regenerated silk fibroin （RSF） membrane were investigated in detail. The continuous film of calcite was formed on the surface of RSF membrane under the regulation of PAA-2k, while the aragonite film could be obtained under the coregulation of PAA-2k and a certain amount of Mg^2＋. Then the nacre-like RSF/aragonite composite was prepared accordingly. The formation of the continuous CaCO3 film on the surface of RSF membrane was speculatively attributed to the coordination between the nucleation-induction of the absorbed PAA on the RSF surface and the inhibiting effect of PAA in solution for the crystallization of CaCO3.