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首页> 外文期刊>Journal of Crystal Growth >Nucleation of sodium sulfate heptahydrate on mineral substrates studied by nuclear magnetic resonance
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Nucleation of sodium sulfate heptahydrate on mineral substrates studied by nuclear magnetic resonance

机译:核磁共振研究矿物基质上七水合硫酸钠的成核

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Porous building materials are very susceptible to the aggressive action of salts, sodium sulfate being one of the most damaging. Laboratory and field experiments show that the intensity of damage depends on the structure of the porous material, as well as the type and amount of salt. In this paper we investigate the nucleation process of sodium sulfate on two kinds of substrates: calcite and quartz particles, the main components of calcitic and quartzitic stones, respectively, to assess the influence of the substrate chemistry on the crystalline phase being formed and on the nucleation process. Nuclear Magnetic Resonance (NMR) is used to investigate the cooling-induced crystallization of sodium sulfate in mixtures of solution with different amounts of substrate particles. Temperature and concentration are measured by NMR and used to calculate the crystallization rate. The phase that precipitates is the metastable heptahydrate. Our experiments show that nucleation is energetically more favorable on a calcitic substrate; that is, the required supersaturation is lower than on the quartzitic substrate. Under isothermal conditions, the precipitation rate is faster in the presence of calcite than quartz.
机译:多孔建筑材料非常容易受到盐的侵蚀作用,硫酸钠是最具破坏性的物质之一。实验室和现场实验表明,破坏的强度取决于多孔材料的结构以及盐的类型和数量。在本文中,我们研究了硫酸钠在方解石和石英颗粒这两种底物上的成核过程,方解石和石英颗粒分别是钙质和石英石的主要成分,以评估基质化学性质对所形成的结晶相以及对结晶相的影响。成核过程。核磁共振(NMR)用于研究冷却诱导的硫酸钠在不同含量的底物颗粒的溶液混合物中的结晶。通过NMR测量温度和浓度,并用于计算结晶速率。沉淀的相为亚稳定的七水合物。我们的实验表明,在钙质基质上,成核在能量上更有利;也就是说,所需的过饱和度低于在石英基体上。在等温条件下,在方解石存在下,沉淀速率要比石英快。

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