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Roles of oleic acid during micropore dispersing preparation of nano-calcium carbonate particles

机译：油酸在纳米碳酸钙颗粒微孔分散制备中的作用

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摘要

In the present work, nano-calcium carbonate powder was prepared by micropore dispersion method with assistance of oleic acid as surfactant. CO_2 gas was dispersed into the Ca(OH)_2/H2-O slurry via a glass micropore-plate with the diameter of micropore about 20 (Jim. To investigate the effect of oleic acid on the size of CaCO-3 particles, different amount of oleic acid was added in Ca(OH)_2/H2_O slurry at 5°C and 25 °C, respectively. XRD patterns show that cubic calcite is the only crystalline phase in all cases. ZPA data and TEM photo indicate that the average particle size synthesized at 5 °C without oleic acid is of about 40 nm, slightly smaller than that of prepared at 25 °C, and that the dispersity of sample prepared at 5°C is better than that of 25 °C. When oleic acid is added in both temperatures, the average particle size decreases a little. FT-1R spectra demonstrate that oleic acid interacts with Ca2+ and carbon-carbon double bond existed on the surface of particle. Consequently, two opposite roles of oleic acid during the process of preparation of nano-CaCC>3 were proposed, namely preventing nanoparticles from growing during reaction and making nanoparticles reunite to a certain extent after reaction.
机译：在本工作中，以油酸为表面活性剂，通过微孔分散法制备了纳米碳酸钙粉末。通过玻璃微孔板将CO_2气体分散到Ca（OH）_2 / H2-O浆液中，该微孔板的微孔直径约为20（Jim。为了研究油酸对CaCO-3颗粒尺寸的影响，不同的量分别在5°C和25°C下在Ca（OH）_2 / H2_O浆液中加入10％的油酸，XRD图谱表明在所有情况下立方方解石都是唯一的结晶相，ZPA数据和TEM照片表明平均颗粒在无油酸的情况下，在5°C下合成的粒径约为40 nm，比在25°C下制备的粒径稍小，并且在5°C下制备的样品的分散度优于25°C。在这两个温度下，油酸的平均粒径略有减小； FT-1R光谱表明油酸与Ca2 +相互作用，并且在颗粒表面存在碳-碳双键，因此，油酸在制备过程中有两个相反的作用提出了纳米CaCC> 3的方法，即防止纳米颗粒生长在反应过程中保持翼型，并在反应后使纳米粒子在一定程度上团聚。

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  • 来源
    《Applied Surface Science》 |2011年第16期|p.7047-7053|共7页
  • 作者

    Jiuxin Jiang; Jie Liu; Chang Liu; Gaowen Zhang; Xinghou Gong; Jianing Liu;

  • 作者单位

    The Research Lab on Soft Matter, College of Chemical and Environmental Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China;

    The Research Lab on Soft Matter, College of Chemical and Environmental Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China;

    The Research Lab on Soft Matter, College of Chemical and Environmental Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China;

    The Research Lab on Soft Matter, College of Chemical and Environmental Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China;

    The Research Lab on Soft Matter, College of Chemical and Environmental Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China;

    The Research Lab on Soft Matter, College of Chemical and Environmental Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nano-caco3; micropore dispersion; oleic acid; carbonation; surfactant;

    机译：纳米碳酸钙;微孔分散;油酸;碳酸化;表面活性剂;

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