摘要
以葡聚糖及明胶为有机基质,在常温中性条件下进行模拟铁生物矿化实验.目的是研究明胶及葡聚糖对氢氧化铁凝胶矿化行为的调控作用及其机理,结果表明葡聚糖容易吸附到铁氧化物表面,对晶核有包裹作用,阻碍了晶核的自由扩散和生长,形成纳米级的β-FeOOH和α-Fe2O3.β-FeOOH是Fe(OH)3转化为α-Fe2O3的中间过渡相.在明胶浓度较低的范围内(小于1 wt%),明胶浓度增大有利于晶体生长形成α-FeOOH.晶体生长有取向性排列,其表面吸附有明胶分子.明胶和葡聚糖等量混合有机质在矿化过程中起主要作用的是葡聚糖,这与葡聚糖的亲水性有关.
The simulative biominealization experiments were studied which performed under normal temperature and medium pH. Dextran and gelatin were used respectively as organic matrices in that mineralization systems. The purpose was to study the effects of gelatin and dextran modulating the mineralization behavior of Fe（OH）3 gel and its mechanism. The result shows that dextran molecule could inhibit the iron oxide nucleus to free diffusion and growth by being absorbed onto their surfaces and enwrapping the nucleus fimly, so nanoscale β-FeOOH and α-Fe2O3 were obtained. β-FeOOH would be the transition phase of Fe（OH）3 gel and u-Fe2O3. With the increasement of the concentration of gelatin（up to 1wt%） in solution, the formation of u-FeOOH in these mineralization systems were accelerated. The crystallites was arranged regularly in some certain direction and gelatin was absorbed on their surfaces. Dextran played an major role in the mineralization system with the mixture of gelatin and dextran（mole ratio is 1：1）. It was related to the high hydrophily of dextran.
出处
《漳州师范学院学报（自然科学版）》
2008年第3期64-68,共5页
Journal of ZhangZhou Teachers College（Natural Science)
