Influence of the type of surfactant on the formation of calcium phosphate in organized molecular systems
Influence of the type of surfactant on the formation of calcium phosphate in organized molecular systems
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DOI：
10.1021/cm991022r
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发表时间：
1999-10-01
影响因子：
8.6
通讯作者：
Lebugle, A
中科院分区：
文献类型：
--
作者：
Sarda, S;Heughebaert, M;Lebugle, A
有机分子系统(OMS)已被广泛应用于矿物固体的形成，以控制其组成、形态和尺寸。本文采用水相含钙微乳和含磷微乳混合的方法合成了磷酸三钙。微乳液用非离子表面活性剂Brij 30或离子表面活性剂AOT在正庚烷中稳定。在Brij30存在下，形成的无定形磷酸三钙凝胶由球形团簇组成，其晶化成磷灰石的过程与在水或水-乙醇介质中观察到的过程相似。相反，AOT的存在诱导了含有有机物质的直接结晶固体的产生，这可能是由于AOT分子在油水界面上的预组织所致。晶体沿择优方向生长，所得晶体的形状和大小与骨矿颗粒相似。提出了定向磷灰石在有序AOT分子载体上成核的假说。
Organized molecular systems (OMS) have been widely used in the formation of mineral solids to control their composition, morphology, and dimensions. In this paper, we synthesized tricalcium phosphate by mixing two microemulsions, one containing calcium in its aqueous phase, the other containing phosphate. The microemulsions were stabilized either with the nonionic surfactant, Brij 30, or with the ionic surfactant, AOT in n-decane. In the presence of Brij 30, the amorphous;tricalcium phosphate gel formed was composed of spherical clusters and its crystallization into apatite used a process comparable to that observed in aqueous or water-alcohol medium. In contrast, the presence of AOT induced the production of a directly crystallized solid containing organic material, which could be due to AOT molecule preorganization at the oil-water interface. The growth of crystallites occurred in a preferential direction, and the crystals obtained were analogous in shape and size to particles of bone mineral. We develop the hypothesis of oriented apatitic nucleation on the organized AOT molecule support.