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.

通过溶胶 - 凝胶过程合成介孔陶瓷的模板，可以将裂解相用于大量的模板。然而，由于裂解相的流动性，这种方法可能无法通过这种方法来模板。无盐的catanionic表面活性剂系统为该问题提供了潜在的解决方案，因为它们的冷冻双层结构在大长度上显示出很大的刚性。此外，它们显示出非常独特的自组装结构。这些阶段应用作在稳定阶段水状态内CACO3结晶的模板。为此，应采用各种以低离子强度起作用的结晶技术，以便在NM等级上再现稳定相。特别感兴趣的稳定阶段是兰米拉阶段以及纳米风险和二十面包。如果可以在层状相中矿化CACO3，则会导致类似于Nacre的分层有机无机杂交材料，其优质的机械性能将产生。为了实现这一目标，必须在CA2+计数器的情况下研究稳定的聚集，并在必要时确定相图。同样，应探索，如果可以将非常小的预成型CaCO3纳米颗粒掺入速气阶段，作为通过pH周期的后来纳米颗粒融合的材料储层。如果可以重现有机模板，则应采用其他相结构，以使介型结构化的CACO3与各种形态合成，这将构成介质结构化离子晶体的基础，这是通过在复杂流体中的软外部结构再现的。这样的材料可以找到许多潜在用途，例如高强度材料，介孔存储或输送系统，新的光学或磁性设备等。