Exchange Reactions at Mineral Interfaces.
Exchange Reactions at Mineral Interfaces.
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DOI：
10.1021/acs.langmuir.0c01565
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发表时间：
2020-08
期刊：
影响因子：
--
通讯作者：
P. Thissen
中科院分区：
文献类型：
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作者：
P. Thissen
交换反应是一类化学反应，发生在矿物表面与质子溶剂接触时。交换反应也可以理解为矿物界面上的一种独特的相互作用。在矿物表面发生的特别重要的相互作用是与水和二氧化碳的相互作用。当矿物质如钙硅酸盐水合物（C-S-H）相与水环境接触时，发生的相当复杂的过程被称为金属质子交换反应（MPER）。这个过程导致钙离子从近表面区域浸出，这是水泥结合材料腐蚀的第一步。在C-S-H相的各种腐蚀反应中，MPER反应是最重要的一种。一种很有前途的方法来解决由MPER和碳化引起的某些问题是C-S-H表面钝化。今天，这样的钝化是达到，例如，通过C-S-H表面功能化与拒水的有机膜。不幸的是，这些有机薄膜对温度的抵抗力较弱，尤其是对磨损的抵抗力较弱。矿物界面上的交换反应允许在室温下通过金属-金属交换反应制备C-S-H相的本征疏水表面。
Exchange-reactions are a family of chemical reactions, which appear when mineral surfaces come into contact with protic solvents. Exchange-reactions can also be understood as a unique interaction at mineral interfaces. Particularly significant interactions occurring at mineral surfaces are the ones with water and CO2. The rather complex process occurring when minerals like calcium-silicate-hydrate (C-S-H) phases come into contact with aqueous environments is referred to as metal-proton exchange reaction (MPER). This process leads to the leaching of calcium ions from the near-surface region, the first step in the corrosion of cement-bound materials. Among the various corrosion reactions of C-S-H phases, the MPER has appeared to be the most important one. A promising approach to bridge certain problems caused by MPER and carbonation is the passivation of C-S-H surfaces. Today, such passivation is reached, for instance, by the functionalization of C-S-H surfaces with water-repelling organic films. Unfortunately, these organic films are weak against temperature and especially weak against abrasion. Exchange reactions at mineral interfaces allow to prepare intrinsic, hydrophobic surfaces of C-S-H phases just at room temperature via metal-metal exchange reaction.