MgCO3·3H2O晶须的制备及其生长机制的研究

doi:10.11962/1006-4990.2019-0588

Abstract

Abstract:

MgCO₃·3H₂O whiskers was prepared with MgCl₂·6H₂O and NH₄HCO₃ as raw materials and as CH₃COONa·3H₂O morphology control agent by precipitation crystallization method.The effects of different amounts of CH₃COONa·3H₂O on the crystal and morphology of MgCO₃·3H₂O and the growth mechanism of whiskers in the system were investigated.The results showed that the rod-shaped MgCO₃·3H₂O whiskers with a length to diameter ratio of 30 can be successfully prepared when the amount of CH₃COONa·3H₂O added was 0.23%（mass fraction）.CH₃COONa·3H₂O may be beneficial to the formation of whiskers,and the growth mechanism of which was proposed：firstly,amorphous 4MgCO₃·Mg（OH）₂·4H₂O was formed,and then they gradually transformed into MgCO₃·3H₂O and grown into rod-shaped whiskers.The Na ⁺ produced by CH₃COONa·3H₂O were selectively adsorbed on the（101） crystal plane of the axial direction of MgCO₃·3H₂O crystal,which inhibited the growth of the crystal plane,and the radial growth was not significantly affected,which promoted amorphous MgCO₃·3H₂O grew into the rod whiskers.

Key words: MgCO₃·3H₂O whisker, CH₃COONa·3H₂O, precipitation crystallization, growth mechanism

CLC Number:

TQ132.2

Wang Yanxia,Cheng Wenting,Fang Li,Cheng Fangqin. Study on preparation and growth mechanism of MgCO₃·3H₂O whiskers[J]. Inorganic Chemicals Industry, 2020, 52(5): 22-26.

Figures/Tables 8

References 17

[1]	闫平科, 马正先, 高玉娟 . 碳酸镁晶须的研究进展概述[J]. 中国非金属矿工业导刊, 2009(3):23-25.
[2]	李汶桦, 胡涛, 王央贡 . 不同晶须材料对玻璃钢性能的影响[J]. 粘接, 2018,39(12):39-41.
[3]	阮恒, 黄尚顺, 桑艳霞 , 等. 碳酸镁晶须的反向沉淀法制备及其阻燃性能[J]. 广西科学, 2016,23(3):255-260.
[4]	Wang X, Xue D . Direct observation of the shape evolution of MgO whiskers in a solution system[J]. Materials Letters, 2006,60(25/26):3160-3164.
[5]	Grant A A, Greener E H . Whisker reinforcement of polymethyl methacrylate denture base resins[J]. Australian Dental Journal, 2010,12(1):29-33.
[6]	Liu Z, Chen Y, Ding W . Preparation,dynamic rheological behavior,crystallization,and mechanical properties of inorganic whiskers reinforced polylactic acid/hydroxyapatite nanocomposites[J]. Journal of Applied Polymer Science, 2016,133(18):1-11.
[7]	Koo M Y, Park J S, Park M K , et al. Effect of aspect ratios of in situ formed TiB whiskers on the mechanical properties of TiBw/Ti-6Al-4V composites[J]. Scripta Materialia, 2012,66(7):487-490. doi: 10.1016/j.scriptamat.2011.12.024
[8]	闫平科, 田海山, 高玉娟 , 等. 高长径比三水碳酸镁晶须的合成研究[J]. 人工晶体学报, 2012,41(1):158-164.
[9]	Yan P K, Wang B, Gao Y J . Study on synjournal of the high aspect ra-tios nesquehonite whiskers[J]. Advanced Materials Research, 2011,239/240/241/242:1118-1122.
[10]	Yang C, Song X, Sun S , et al. Effects of sodium dodecyl sulfate on the oriented growth of nesquehonite whiskers[J]. Advanced Powder Technology, 2013,24(3):585-592. doi: 10.1016/j.apt.2012.10.005
[11]	王余莲, 印万忠, 张夏翔 , 等. 大长径比三水碳酸镁晶须的制备及晶体生长机理[J]. 硅酸盐学报, 2018,46(7):938-944.
[12]	高立 . 稀土氟化物纳/微米材料的形貌控制合成及发光性质研究[D]. 长春:中国科学院长春应用化学研究所, 2009.
[13]	朱海 . 钯纳米颗粒形貌控制合成及其催化性能研究[D]. 武汉:中南民族大学, 2012.
[14]	闫小星, 李云飞, 薛冬峰 , 等. 基于水合碳酸镁结晶过程的化学键分析[J]. 人工晶体学报, 2007,36(5):991-999.
[15]	陈贵兰, 宋兴福, 于建国 . 杂质离子对MgCl₂和CO₂反应-萃取-醇析耦合过程的影响[J]. 化工学报, 2017,68(2):702-707.
[16]	Cheng W, Zhang C, Cheng H , et al. Effect of ethanol on the crysta-llization and phase transformation of MgCO₃·3H₂O in a MgCl₂-CO₂-NH₃·H₂O system[J]. Powder Technology, 2018,335:164-170. doi: 10.1016/j.powtec.2018.04.063
[17]	Liu X W, Feng Y L, Li H R . Preparation of basic magnesium carbonate and its thermal decomposition kinetics in air[J]. Journal of Central South University of Technology, 2011,18(6):1865-1870.

反应时间/min	m/ mg	w₁/ %	w₂/ %	w₃/ %	（m₁/m）/ %	（m₂/m）/ %
7	9.72	28.4	27.6	6.8	33.0	67.0
30	9.90	28.5	27.5	7.5	39.8	60.2
75	8.98	34.2	31.8	3.7	100.0	0.0
270	6.14	21.9	34.6	2.9	0.0	100.0

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation and growth mechanism of MgCO₃·3H₂O whiskers

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Study on preparation and growth mechanism of MgCO3·3H2O whiskers