Study on hydrothermal crystallization kinetics of magnesium oxysulfate nanowires

doi:10.11949/0438-1157.20220219

Abstract

Abstract:

Using magnesium sulfate and sodium hydroxide as raw materials and potassium hydrogen phthalate as complexing agent, basic magnesium sulfate nanowires were prepared by complexation-hydrothermal method. The crystallization mechanism of magnesium oxysulfate (MOS) nanowire was investigated, and the crystallization kinetic equations were established by analyzing the concentration of Mg via the hydrothermal synthesis process. Then, the surface nucleation mode of the nanowire was confirmed. The results illustrated the crystallization of the nanowire was controlled by multi-core surface growth mode at 140℃ and 160℃. However, it changed to linear surface growth mode at 180℃ and 200℃. The microstructures of MOS nanowires were investigated by transmission electron microscopy. There are many edge dislocations and screw dislocations in the crystals, their effects in MOS nanowires on growth kinetics are to decrease the two-dimensional nucleation barrier and act as a self-perpetuating step sources.

Key words: magnesium oxysulfate, nanowires, hydrothermal, crystallization, kinetics, nucleation

摘要：

以硫酸镁和氢氧化钠为原料，邻苯二甲酸氢钾为络合剂，采用络合-水热法制备了碱式硫酸镁纳米线；采用宏观动力学方法结合微观结构分析，进行碱式硫酸镁结晶机理研究。通过分析Mg浓度与时间的变化关系曲线，建立结晶动力学方程；然后根据晶体缺陷分析碱式硫酸镁纳米线表面成核机制。实验结果表明：碱式硫酸镁纳米线在140和160℃结晶机理为多核控制表面生长；在180和200℃时结晶机理发生了变化，转变为线性控制表面生长；碱式硫酸镁纳米线的晶格中存在着较多的刃型位错与螺型位错，可以促进其表面成核、快速生长。

关键词: 碱式硫酸镁, 纳米线, 水热, 结晶, 动力学, 成核

CLC Number:

O 781

Xueying NAI, Peng WU, Yuan CHENG, Jianfei XIAO, Xin LIU, Yaping DONG. Study on hydrothermal crystallization kinetics of magnesium oxysulfate nanowires[J]. CIESC Journal, 2022, 73(7): 3038-3044.

乃学瑛, 吴鹏, 程远, 肖剑飞, 刘鑫, 董亚萍. 水热生长碱式硫酸镁纳米线结晶动力学研究[J]. 化工学报, 2022, 73(7): 3038-3044.

Figures/Tables 6

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动力学模型	140℃		160℃		180℃		200℃
动力学模型	R²	RSS	R²	RSS	R²	RSS	R²	RSS
MA-1	0.9819	0.0022	0.9963	0.0005	0.9421	0.0101	0.9351	0.0102
MA-2	0.8984	0.0060	0.9100	0.0086	0.9790	0.0029	0.9555	0.0058
MA-3	0.5498	0.0201	0.6151	0.0279	0.9068	0.0077	0.9176	0.0081
MA-4	0.2961	0.0326	0.3584	0.0463	0.7054	0.0191	0.8086	0.0160
MB-1	0.4596	0.4900	0.6073	0.1061	0.4346	0.4464	0.4479	0.4680
MB-2	0.4600	0.4871	0.4405	0.5617	0.4345	0.4462	0.4481	0.4689
MB-3	0.4598	0.4947	0.4409	0.5656	0.4351	0.4474	0.4481	0.4716
MB-4	0.4598	0.4947	0.4409	0.5657	0.4349	0.4500	0.4481	0.4715
MC-1	0.8715	0.0059	0.8031	0.0145	0.9979	0.0002	0.9811	0.0021
MC-2	0.4780	0.0202	0.4832	0.0329	0.8782	0.0080	0.9446	0.0043
MC-3	0.2472	0.0323	0.2736	0.0502	0.6510	0.0201	0.8026	0.0122
MC-4	0.1311	0.0418	0.1644	0.0641	0.4218	0.0330	0.6209	0.0208

动力学模型	140℃		160℃		180℃		200℃
动力学模型	R²	RSS	R²	RSS	R²	RSS	R²	RSS
MA-1	0.9819	0.0022	0.9963	0.0005	0.9421	0.0101	0.9351	0.0102
MA-2	0.8984	0.0060	0.9100	0.0086	0.9790	0.0029	0.9555	0.0058
MA-3	0.5498	0.0201	0.6151	0.0279	0.9068	0.0077	0.9176	0.0081
MA-4	0.2961	0.0326	0.3584	0.0463	0.7054	0.0191	0.8086	0.0160
MB-1	0.4596	0.4900	0.6073	0.1061	0.4346	0.4464	0.4479	0.4680
MB-2	0.4600	0.4871	0.4405	0.5617	0.4345	0.4462	0.4481	0.4689
MB-3	0.4598	0.4947	0.4409	0.5656	0.4351	0.4474	0.4481	0.4716
MB-4	0.4598	0.4947	0.4409	0.5657	0.4349	0.4500	0.4481	0.4715
MC-1	0.8715	0.0059	0.8031	0.0145	0.9979	0.0002	0.9811	0.0021
MC-2	0.4780	0.0202	0.4832	0.0329	0.8782	0.0080	0.9446	0.0043
MC-3	0.2472	0.0323	0.2736	0.0502	0.6510	0.0201	0.8026	0.0122
MC-4	0.1311	0.0418	0.1644	0.0641	0.4218	0.0330	0.6209	0.0208

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