Biomimetic nucleation and growth of CaCO3 in hydrogels incorporating carboxylate groups
Biomimetic nucleation and growth of CaCO3 in hydrogels incorporating carboxylate groups
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DOI：
10.1016/s0142-9612(03)00526-x
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发表时间：
2004-01-01
期刊：
影响因子：
14
通讯作者：
Löbmann, P
中科院分区：
文献类型：
--
作者：
Grassmann, O;Löbmann, P
聚丙烯酰胺水凝胶通过与丙烯酸共聚改性，并用作CaCO 3在双扩散排列中的生长介质。凝胶网络中的羧酸酯官能团促进了大量球霰石和方解石的小微晶的成核，即使在水凝胶内过饱和度增加时，这些微晶也暂时稳定。经过一个较长的诱导期后，观察到方解石晶体沿着其c轴的快速球晶生长，产生直径超过300 μ m的球体。在这些聚集体的无序，多孔区域的中心可以被确定为这个快速结晶的起始点。的矿化机制显着改变特定的相互作用之间的-COOH官能化网络和不断发展的矿物相。(C)2003爱思唯尔有限公司。保留所有权利。
Poly-acrylamide hydrogels were modified by copolymerization with acrylic acid and used as growth medium for CaCO3 in a double-diffusion arrangement. The carboxylate functionalities in the gel network facilitate the nucleation of a multitude of small crystallites of vaterite and calcite, which are temporarily stabilized even while supersaturation is increasing within the hydrogel. After an extended induction period the rapid spherulitic growth of calcite crystals along their c-axis is observed yielding spheres with diameters exceeding 300 mum. In the center of those aggregates disordered, porous regions can be identified as starting point of this rapid crystallization.The results are compared to previous studies on native poly-acrylamide hydrogels and networks modified with -SO3H functional groups. The mineralization mechanism is significantly altered by specific interactions between the -COOH functionalized network and the evolving mineral phase. (C) 2003 Elsevier Ltd. All rights reserved.