Controlled Precipitation of Biominerals using Catanionic Surfactant Self-Assembly Structures

使用阴离子表面活性剂自组装结构控制生物矿物沉淀

• 批准号: 5415807
• 负责人: Professor Dr. Helmut Cölfen (†)
• 金额: --
• 依托单位: Institut de Chimie Séparative de Marcoule (ICSM) - UMR 5257
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5415807?language=en
• 关键词: Controlled; Precipitation; Biominerals; using; Catanionic

Lyotropic phases could be used with great success as template for the synthesis of mesoporous ceramics via a sol-gel process. However, ion crystals could so far not be templated by such approach - likely as a result of the fluidity of the lyotropic phases. Salt-free catanionic surfactant systems offer a potential solution to this problem as their frozen bilayer structure displays great rigidity over large length scales. Furthermore, they show quite unique self-assembly structures. These phases shall be used as a template for the crystallization of CaCO3 within the water regime in the catanionic phase. For this, various crystallization techniques shall be employed which work at low ionic strength in order to reproduce the catanionic phase on the nm scale. The catanionic phases of particular interest are the lamella phases as well as the nanodisks and icosahedra. If CaCO3 could be mineralized within the lamellar phase, a layered organic-inorganic hybrid material similar to nacre with its superior mechanical properties would result. To achieve this, the catanionic aggregation has to be investigated in presence of the Ca2+ counterions and if necessary, the phase diagrams have to be determined. Also, it shall be explored, if very small pre-formed CaCO3 nanoparticles can be incorporated into the catanionic phases as material reservoir for later nanoparticle fusion via pH cycles. If it is possible to reproduce the organic template, other phase structures shall be employed in order to synthesize mesoscopically structured CaCO3 with various morphologies which will form a basis for the production of mesoscopically structured ionic crystals via the reproduction of soft superstructures in complex fluids. Such materials could find numerous potential uses for example as high strength materials, mesoporous storage or delivery systems, new optical or magnetic devices and so forth.

溶致相可以作为模板剂通过溶胶-凝胶法合成介孔陶瓷。然而，离子晶体到目前为止还不能通过这种方法模板化-可能是由于溶致相的流动性。无盐的阴阳离子表面活性剂系统提供了一个潜在的解决方案，这个问题，因为他们的冷冻双层结构显示出很大的刚性在大的长度尺度。此外，它们还表现出非常独特的自组装结构。这些相应用作CaCO 3在阴阳离子相的水状态下结晶的模板。为此，应采用在低离子强度下工作的各种结晶技术，以便在nm尺度上再现阴阳离子相。特别感兴趣的阴阳离子相是层状相以及纳米盘和二十面体。如果CaCO 3能够在层状相中矿化，则将产生类似于珍珠层的具有上级机械性能的层状有机-无机杂化材料。为了实现这一点，阴阳离子聚集的Ca 2+抗衡离子的存在下进行了研究，如果必要的话，相图必须确定。此外，还应探索是否可以将非常小的预形成的CaCO 3纳米颗粒掺入阴阳离子相中作为材料储库，用于随后通过pH循环进行的纳米颗粒融合。如果有可能再现有机模板，则应采用其他相结构以合成具有各种形态的介观结构的CaCO 3，其将形成用于通过在复杂流体中再现软超结构来生产介观结构的离子晶体的基础。这种材料可以发现许多潜在的用途，例如作为高强度材料、中孔存储或递送系统、新的光学或磁性器件等。