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首页> 外文OA文献 >A novel route for the synthesis of Mesoporous and low-thermal stability materials by coupled dissolution-reprecipitation reactions: Mimicking hydrothermal mineral formation
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A novel route for the synthesis of Mesoporous and low-thermal stability materials by coupled dissolution-reprecipitation reactions: Mimicking hydrothermal mineral formation

机译：通过溶解-再沉淀反应合成介孔和低热稳定性材料的新途径：模拟热液矿物的形成

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Replacement reactions ('pseudomorphism') commonly occur in Nature under a large range of conditions (T 25 to >600 °C; P 1 to >5 kbar). Whilst mineral replacement reactions are often assumed to proceed by solid-state diffusion of the metal ions through the mineral, many actually proceed via a coupled dissolution and reprecipitation (CDR) mechanism. In such cases, a starting mineral is dissolved into a fluid and this dissolution is coupled with the precipitation of a replacement phase across the reaction front. In cases where there are close relationships between the crystal structures of the parent and newly formed minerals, the replacement can be topotactic (interface-coupled dissolution and reprecipitation). The kinetics and chemistry of the CDR route are fundamentally different from solid-state diffusion and can be exploited i) for the synthesis of materials that are often difficult to synthesise via traditional methods and ii) to obtain materials with unique properties. This review highlights recent research into the use of CDR for such synthetic challenges. Emphasis has been given to i) the use of CDR to synthesise compounds with relatively low thermal stability such as the thiospinel mineral violarite ((Ni,Fe)3S4), ii) preliminary work into use of CDR for the production of roquesite (CuInS2), a potentially important photovoltaic component and, iii) examples where the textures resulting from CDR reactions are controlled by the nature and texture of the parent phase and the reaction conditions; these being the formation of micro-porous gold and three-dimensional ordered arrays of nanozeolite of uniform size and crystallographic orientation.
机译：在大自然条件下（T 25至> 600°C； P 1至> 5 kbar），置换反应（“伪同构”）通常发生在自然界中。虽然通常假定矿物替代反应是通过金属离子通过矿物的固态扩散进行的，但实际上许多反应是通过溶解和再沉淀（CDR）耦合机理进行的。在这种情况下，将起始矿物溶解在流体中，并且这种溶解与置换相在整个反应前沿的沉淀相结合。如果母体的晶体结构与新形成的矿物质的晶体结构之间存在紧密的关系，则替代可以是全定向的（界面耦合的溶解和再沉淀）。 CDR途径的动力学和化学性质与固态扩散从根本上不同，可用于以下方面：i）合成通常难以通过传统方法合成的材料，以及ii）获得具有独特性能的材料。这篇综述重点介绍了针对此类合成挑战使用CDR的最新研究。重点是i）使用CDR合成具有相对较低的热稳定性的化合物，例如硫代松油矿物堇青石（（Ni，Fe）3S4），ii）CDR用于生产水铁矿（CuInS2）的初步工作，可能是重要的光伏组件，以及iii）CDR反应产生的结构受母相的性质和结构以及反应条件控制的示例；这些是形成微孔金和尺寸和晶体学取向均一的纳米沸石的三维有序阵列。

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