Preparation of pure vaterite by simple mechanical mixing of two aqueous salt solutions
Preparation of pure vaterite by simple mechanical mixing of two aqueous salt solutions
复制标题
DOI：
10.1016/j.msec.2008.11.009
复制
发表时间：
2009-05-05
期刊：
影响因子：
--
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
--
作者：
Mori, Yohta;Enomae, Toshiharu;Isogai, Akira
与方解石或文石型多晶型物相比，球霰石型碳酸钙颗粒具有一些独特的性质，例如高亲水性、大表面积和由初级球霰石颗粒组成的分级结构。本文从表面活性剂的存在、溶液的搅拌方式等方面对CaCl2和K2CO3两种盐溶液混合处理制备球文石的条件进行了研究。使用双圆筒型均质器或超声均质器搅拌溶液。当采用合适的混合条件时，通过在室温下使用任何类型的均化器在没有任何表面活性剂的情况下混合两种盐溶液，定量地获得作为细粉末的纯球霰石。当聚氧乙烯脱水山梨糖醇单脂肪酸酯作为表面活性剂存在于混合溶液中时，根据所使用的表面活性剂的化学结构，获得纯球文石，但不同的形态或粒度。所得结果表明，在本研究所用条件下，需要对1 M盐浓度左右的混合溶液进行均匀、高剪切和持续搅拌，以制备纯球文石。(C)2008 Elsevier B.V.保留所有权利。
Vaterite-type calcium carbonate particles have some unique properties such as high hydrophilicity, large surface areas, and hierarchical structures consisting of primary vaterite particles in comparison with calcite- or aragonite-type polymorphs. In this paper, preparation conditions of vaterite by mixing treatment of two salt solutions, CaCl2 and K2CO3, were studied in terms of the presence of surfactant, agitation method of the solutions and other conditions. A double-cylinder-type homogenizer or ultrasonic homogenizer was used for agitation of the solutions. When suitable mixing conditions were adopted, pure vaterite was obtained as fine powders quantitatively by mixing the two salt solutions at room temperature without any surfactant using any types of homogenizers. When a polyoxyethylene sorbitan monofatty acid ester was present as a surfactant in the mixing solutions, pure vaterite but different morphologies or particle sizes were obtained, depending on the chemical Structure of the surfactant used. The obtained results revealed that homogeneous, high-shear and constant agitation of the mixing Solutions around I M salt concentration was necessary to prepare pure vaterite under the conditions used in this study. (C) 2008 Elsevier B.V. All rights reserved.