Viscosity properties and magnetoviscous effects of Ni0.5Zn0.5Fe2O4 vegetable oil-based magnetic fluid

doi:10.16085/j.issn.1000-6613.2022-1549

Abstract

Abstract:

The mineral oil-based magnetic fluid has the problems of environmental pollution and difficulty in biodegradation. Vegetable oil has the advantages of being green and excellent biodegradability. In this paper, Ni_0.5Zn_0.5Fe₂O₄ magnetic fluid was prepared by two-step method using vegetable oil as base liquid. The sedimentation stability was studied by orthogonal experiment, and the viscosity properties and magnetoviscous effects were studied by single variable method. Experimental results showed that the sedimentation stability was better when acetone was used as dispersant with a mass fraction of 11% and Ni_0.5Zn_0.5Fe₂O₄mass fraction of 2.4%. Under the condition of no magnetic field or magnetic field, the viscosity decreased with increasing temperature. The viscosity increased and then decreased with increasing mass fraction of dispersant and Ni_0.5Zn_0.5Fe₂O₄, and the inflection point appeared when the mass fraction of dispersant was 11% and the mass fraction of Ni_0.5Zn_0.5Fe₂O₄ was 2.4%. The viscosity increased with increasing magnetic field intensity, showing the characteristics of non-Newtonian fluids. Vegetable oil as the base liquid of magnetic fluids was an ideal choice. Vegetable oil-based magnetic fluid had better sedimentation stability, having unique advantages over mineral oil-based magnetic fluid. In the future, vegetable oil-based magnetic fluid can become a new environmentally friendly working medium.

Key words: magnetic fluid, vegetable oil, nanoparticles, dispersion, sedimentation stability, viscosity, magnetoviscous effects

摘要：

以矿物油为基液的油基磁流体存在环境污染、难以生物降解的问题。植物油具有绿色环保、生物降解性强等优点。本文以植物油为基液，利用两步法制备了Ni_0.5Zn_0.5Fe₂O₄磁流体，应用正交实验研究了沉降稳定性，采用单一变量法研究了黏度特性及磁黏特性。其结果表明：以丙酮为分散剂，质量分数为11%，Ni_0.5Zn_0.5Fe₂O₄质量分数为2.4%时，沉降稳定性较佳；在零磁场/磁场条件下，黏度随温度的升高而降低；黏度随分散剂和Ni_0.5Zn_0.5Fe₂O₄质量分数的增大而先增大后减小，分别在分散剂质量分数为11%时和Ni_0.5Zn_0.5Fe₂O₄质量分数为2.4%时出现拐点；黏度随磁场强度的增大而增大，呈非牛顿流体的特征。植物油是磁流体基液的一种理想选择，植物油基磁流体有较好的沉降稳定性，相较于矿物油基磁流体具有独特的优势，未来可将植物油基磁流体作为一种新型的环保工作介质。

关键词: 磁流体, 植物油, 纳米粒子, 分散系, 沉降稳定性, 黏度, 磁黏特性

CLC Number:

TB34

XIE Zhiwei, WU Zhangyong, ZHU Qichen, JIANG Jiajun, LIANG Tianxiang, LIU Zhenyang. Viscosity properties and magnetoviscous effects of Ni_0.5Zn_0.5Fe₂O₄ vegetable oil-based magnetic fluid[J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3623-3633.

谢志伟, 吴张永, 朱启晨, 蒋佳骏, 梁天祥, 刘振阳. 植物油基Ni_0.5Zn_0.5Fe₂O₄磁流体的黏度特性及磁黏特性[J]. 化工进展, 2023, 42(7): 3623-3633.

Figures/Tables 18

References 42

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元素范围	归一化质量百分比/%
元素范围	1#1	1#2	1#3	1#4	1#5	平均占比
O	28.65	29.34	28.17	27.59	28.94	28.54
Fe	43.28	41.78	41.74	48.35	43.75	43.78
Ni	13.31	13.22	14.45	10.64	13.12	12.95
Zn	14.76	15.66	15.64	13.42	14.18	14.73

元素范围	归一化质量百分比/%
元素范围	1#1	1#2	1#3	1#4	1#5	平均占比
O	28.65	29.34	28.17	27.59	28.94	28.54
Fe	43.28	41.78	41.74	48.35	43.75	43.78
Ni	13.31	13.22	14.45	10.64	13.12	12.95
Zn	14.76	15.66	15.64	13.42	14.18	14.73

样品	分散剂种类	沉降系数K
样品	分散剂种类	1d	2d	4d	6d	8d	10d	12d	14d
1	油酸	1.0	0.563	0.20	0.10	0.05	0	0	0
2	丙酮	1.0	0.97	0.96	0.95	0.95	0.92	0.875	0.85
3	正丁醇	1.0	0.588	0.375	0.15	0.10	0.08	0.05	0.03
4	无分散剂	1.0	0.975	0.95	0.95	0.93	0.875	0.775	0.687
5	聚乙二醇400	1.0	0.15	0.13	0.10	0.10	0.08	0.05	0.02
6	聚乙二醇600	1.0	0.935	0.17	0.12	0.10	0.10	0.05	0.03

样品	分散剂种类	沉降系数K
样品	分散剂种类	1d	2d	4d	6d	8d	10d	12d	14d
1	油酸	1.0	0.563	0.20	0.10	0.05	0	0	0
2	丙酮	1.0	0.97	0.96	0.95	0.95	0.92	0.875	0.85
3	正丁醇	1.0	0.588	0.375	0.15	0.10	0.08	0.05	0.03
4	无分散剂	1.0	0.975	0.95	0.95	0.93	0.875	0.775	0.687
5	聚乙二醇400	1.0	0.15	0.13	0.10	0.10	0.08	0.05	0.02
6	聚乙二醇600	1.0	0.935	0.17	0.12	0.10	0.10	0.05	0.03

样品	丙酮质量分数/%	沉降系数K
样品	丙酮质量分数/%	1d	2d	4d	6d	8d	10d	12d	14d
1	7	1.0	0.97	0.96	0.95	0.945	0.92	0.90	0.86
2	8	1.0	0.97	0.96	0.95	0.95	0.925	0.91	0.88
3	9	1.0	0.98	0.96	0.96	0.95	0.93	0.91	0.89
4	10	1.0	0.98	0.97	0.96	0.96	0.93	0.92	0.90
5	11	1.0	0.99	0.97	0.97	0.96	0.94	0.92	0.90
6	12	1.0	0.98	0.97	0.955	0.95	0.925	0.91	0.90

Viscosity properties and magnetoviscous effects of Ni_0.5Zn_0.5Fe₂O₄ vegetable oil-based magnetic fluid

植物油基Ni_0.5Zn_0.5Fe₂O₄磁流体的黏度特性及磁黏特性

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Figures/Tables 18

References 42

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样品	Ni_0.5Zn_0.5Fe₂O₄质量分数/%	沉降系数K
样品	Ni_0.5Zn_0.5Fe₂O₄质量分数/%	1d	2d	4d	6d	8d	10d	12d	14d
1	0.48	1.0	0.99	0.97	0.97	0.96	0.94	0.92	0.90
2	0.96	1.0	0.99	0.975	0.97	0.96	0.93	0.90	0.875
3	1.43	1.0	0.992	0.98	0.97	0.96	0.95	0.93	0.915
4	1.9	1.0	0.992	0.98	0.975	0.97	0.95	0.94	0.92
5	2.4	1.0	0.995	0.99	0.98	0.98	0.97	0.95	0.943
6	2.82	1.0	0.96	0.90	0.825	0.775	0.725	0.65	0.40

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