凝胶体系中不同因素对碳酸钙晶体生长的影响

Effect of Different Factors on the Crystal Growth of Calcium Carbonate in Agar Gel

具有三维网络结构琼脂凝胶侧链上含有大量羟基、醚基和醛基,利用其作为软模板来调控CaCO3晶体的生长,通过改变反应物Ca2+、CO2-3和琼脂凝胶浓度以及反应时间等实验参数考察对产物形貌和尺寸的影响。结果表明:反应物以及琼脂凝胶浓度对晶体的物相没有影响,都出现了方解石型碳酸钙晶体;随着反应介质琼脂凝胶浓度的改变碳酸钙晶体的形貌和尺寸都发生了变化,主要为棒状和球形。碳酸钙与琼脂凝胶分子复合物呈现分形形态,且随着反应时间和琼脂凝胶浓度的增加,分形的尺寸也逐步增加。对于琼脂凝胶体系作为生物有机模板合成无机晶体提供了有益的借鉴和启示作用。

Three-dimensional network of agar gels contains a lot of hydroxyl,ether and aldehyde groups and can be used as soft template to regulate and control the crystallization of CaCO3 crystals.The influences of agar gels and Ca2＋,CO32-with different concentrations on the size,morphology of CaCO3 crystals are studied.The results indicate only rod-like and spherical calcite calcium carbonate crystals formed with different concentrations of agar gels and reactants.It indicates the phase of CaCO3 crystal unchanged in these conditions.The complex of CaCO3 crystals and agar gels assembled into fractals,and the size of fractals become larger when concentrations of agar gels increased with the time.This study provides references and enlightenment of agar gels as template for synthesis of inorganic crystals.