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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Temperature- and pH-dependent morphology and FT-IR analysis of magnesium carbonate hydrates
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Temperature- and pH-dependent morphology and FT-IR analysis of magnesium carbonate hydrates

机译：碳酸镁水合物的温度和pH依赖形貌和FT-IR分析

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摘要

Various morphologies of magnesium carbonate hydrates have been synthesized by carefully adjusting the reaction temperature and pH value of the initial reaction solution in the precipitation process. At lower temperatures (from room temperature to 328 K) and lower pH values (variation with the reaction temperature), magnesium carbonate hydrates are prone to display needlelike morphology, and the axis diameter of the particles decreases with the increase of reaction temperature and pH value. With the further increase of the reaction temperature (333-368 K) and pH value, the sheetlike crystallites become the preferred morphology, and at higher temperatures and pH values, these crystallites tend to assemble into layerlike structures with diverse morphologies, such as spherical-like particles with rosette-like structure and cakelike particles built from sheetlike structure. Fourier transform infrared (FT-IR) spectra show that these various morphologies are closely related to their compositions. The needlelike magnesium carbonate hydrate has a formula of MgCO3 center dot chi H2O, in which the value x is greatly affected by the experimental conditions, whereas with the morphological transformation from needlelike to sheetlike structure, their corresponding compositions also change from MgCO3 center dot chi H2O to Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O in the interval of 328-333 K.
机译：通过仔细调节沉淀过程中初始反应溶液的反应温度和pH值，合成了各种形态的碳酸镁水合物。在较低的温度（从室温到328 K）和较低的pH值（随反应温度变化）下，碳酸镁水合物易于呈现针状形态，并且随着反应温度和pH值的增加，颗粒的轴径会减小。随着反应温度（333-368 K）和pH值的进一步提高，片状微晶成为首选形态，在更高的温度和pH值下，这些微晶倾向于组装成具有各种形态的层状结构，例如球形如具有玫瑰花状结构的颗粒和由片状结构构建的蛋糕状颗粒。傅立叶变换红外（FT-IR）光谱表明，这些各种形态与它们的组成密切相关。针状碳酸镁水合物的分子式为MgCO3中心点chi H2O，其中x值受实验条件的影响很大，而随着形态从针状转变为片状结构，其相应的组成也由MgCO3中心点chi H2O改变。 Mg-5（CO3）（4）（OH）（2）中心点4H（2）O的间隔为328-333 K.

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