Preparation of oil-based NiFe2O4 magnetic fluid and stability of magnetic field settlement

doi:10.16085/j.issn.1000-6613.2019-0072

Abstract

Abstract:

At present, the preparation methods of magnetic fluids are mostly chemical co-precipitation methods, and there are few studies on the preparation process of micro-emulsification and the magnetic field sedimentation stability. The dispersant and its mass fraction required for the high quality cycloalkyl NiFe₂O₄ magnetic fluid were selected by single factor and uniform test design. Through the sample sedimentation coefficient and viscosity characteristics, the effects of dispersant type and mass fraction, NiFe₂O₄ nanoparticle mass fraction, emulsifier type and temperature on the magnetic field sedimentation stability of magnetic fluid were studied, and the better parameters for preparing cycloalkyl NiFe₂O₄ magnetic fluid were obtained. Results showed that when the mass fraction of SDBS, SDS and OA was in the range of 1%～6%, the sedimentation stability of cycloalkyl NiFe₂O₄ magnetic fluid was better, and the effect of SDBS and OA was greater than SDS on its stability. When the amount of dispersant was fixed, the magnetic fluid first exhibited well stability with the increase of the NiFe₂O₄ magnetic nanoparticles mass fraction, and then agglomeration gradually occurred. At a certain temperature, the emulsifier Surf CA20 was favorable for the formation of liquid crystal inside the magnetic fluid. The liquid crystal reduced the attraction potential between the liquid beads and the coalescence speed of the magnetic particles, thereby improving the magnetic field sedimentation stability of the magnetic fluid.

Key words: microemulsification, colloid, magnetorheological fluid, magnetic field, stability, interface

摘要：

目前，磁流体的制备方法多为化学共沉淀法，关于磁流体微乳化制备工艺及有磁场沉降稳定性的研究较少。采用单因素和均匀实验设计方法，判定分散剂及其质量分数对环烷基NiFe₂O₄磁流体沉降稳定性的影响。本文采用微乳化法制备环烷基NiFe₂O₄磁流体，通过样品沉降系数和黏度特性，研究分散剂种类与其质量分数、NiFe₂O₄纳米磁性颗粒质量分数、乳化剂种类及温度对磁流体有磁场沉降稳定性的影响，得到制备环烷基NiFe₂O₄磁流体的较佳参数值。研究结果表明：当十二烷基苯磺酸钠（SDBS）、十二烷基硫酸钠（SDS）与油酸（OA）的质量分数在1%～6%范围内，环烷基NiFe₂O₄磁流体的沉降稳定性较好，并且SDBS与OA的含量对其稳定性的影响大于SDS；当分散剂定量时，随着NiFe₂O₄纳米磁性颗粒质量分数的增加，磁流体先表现出较好的稳定性，后逐渐出现团聚；在一定温度时，乳化剂Surf CA20有利于磁流体内部形成液晶相，减小液珠间吸引势能并且降低磁性颗粒的聚结速度，提高磁流体的有磁场沉降稳定性。

关键词: 微乳化, 胶体, 磁流体, 磁场, 稳定性, 界面

CLC Number:

TB33
TQ43

Wen CHEN, Zhangyong WU, Lianzhi ZHANG, Xiaoming CAI, Qichen ZHU. Preparation of oil-based NiFe₂O₄ magnetic fluid and stability of magnetic field settlement[J]. Chemical Industry and Engineering Progress, 2019, 38(06): 2665-2673.

陈文, 吴张永, 张莲芝, 蔡晓明, 朱启晨. 环烷基NiFe₂O₄磁流体的制备及有磁场沉降稳定性[J]. 化工进展, 2019, 38(06): 2665-2673.

Figures/Tables 15

References 32

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样品	分散剂Ⅲ	分散剂 Ⅰ	沉降系数
样品	分散剂Ⅲ	分散剂 Ⅰ	0周	1周	2周	3周	4周	5周
1	OA	SDBS	1	0.98	0.96	0.96	0.96	0.96
2		SDS	1	0.96	0.95	0.95	0.95	0.95
3		BS-12	0.8	0.7	0.6	0.6	0.6	0.6
4		CTMAB	0.64	0.6	0.59	0.59	0.59	0.59
5		GLT	1	0.96	0.95	0.95	0.95	0.95
6		PEG400	0.48	0.42	0.38	0.32	0.32	0.32
7		PEG6000	0.64	0.59	0.56	0.56	0.56	0.56

样品	分散剂Ⅲ	分散剂 Ⅰ	沉降系数
样品	分散剂Ⅲ	分散剂 Ⅰ	0周	1周	2周	3周	4周	5周
1	OA	SDBS	1	0.98	0.96	0.96	0.96	0.96
2		SDS	1	0.96	0.95	0.95	0.95	0.95
3		BS-12	0.8	0.7	0.6	0.6	0.6	0.6
4		CTMAB	0.64	0.6	0.59	0.59	0.59	0.59
5		GLT	1	0.96	0.95	0.95	0.95	0.95
6		PEG400	0.48	0.42	0.38	0.32	0.32	0.32
7		PEG6000	0.64	0.59	0.56	0.56	0.56	0.56

样品	分散剂Ⅲ	分散剂 Ⅰ	沉降系数
样品	分散剂Ⅲ	分散剂 Ⅰ	0周	1周	2周	3周	4周	5周
1	SA	SDBS	0.83	0.69	0.61	0.43	0.43	0.43
2		SDS	0.81	0.69	0.6	0.43	0.42	0.42
3		BS-12	0.69	0.65	0.6	0.59	0.59	0.59
4		CTMAB	0.51	0.45	0.33	0.21	0.21	0.21
5		GLT	0.46	0.42	0.36	0.29	0.29	0.29
6		PEG400	0.4	0.4	0.3	0.16	0.16	0.16
7		PEG6000	0.46	0.41	0.35	0.27	0.27	0.27

样品	分散剂Ⅲ	分散剂 Ⅰ	沉降系数
样品	分散剂Ⅲ	分散剂 Ⅰ	0周	1周	2周	3周	4周	5周
1	SA	SDBS	0.83	0.69	0.61	0.43	0.43	0.43
2		SDS	0.81	0.69	0.6	0.43	0.42	0.42
3		BS-12	0.69	0.65	0.6	0.59	0.59	0.59
4		CTMAB	0.51	0.45	0.33	0.21	0.21	0.21
5		GLT	0.46	0.42	0.36	0.29	0.29	0.29
6		PEG400	0.4	0.4	0.3	0.16	0.16	0.16
7		PEG6000	0.46	0.41	0.35	0.27	0.27	0.27

样品	分散剂Ⅲ	分散剂Ⅱ	分散剂Ⅰ	沉降系数
样品	分散剂Ⅲ	分散剂Ⅱ	分散剂Ⅰ	0周	1周	2周	3周	4周	5周
1	OA	SDBS	SDS	1	0.98	0.98	0.98	0.98	0.98
2			BS-12	0.29	0.2	0.15	0.15	0.15	0.15
3			CTMAB	0.15	0.15	0.15	0.15	0.15	0.15
4			GLT	0.9	0.83	0.83	0.83	0.83	0.83
5			PEG400	0.18	0.18	0.18	0.18	0.18	0.18
6			PEG6000	0.14	0.14	0.14	0.14	0.14	0.14

Preparation of oil-based NiFe₂O₄ magnetic fluid and stability of magnetic field settlement

环烷基NiFe₂O₄磁流体的制备及有磁场沉降稳定性

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组号	SDBS质量分数/%	SDS质量分数/%	OA质量分数/%	第五周沉降系数/%
1	1	2	3	81
2	2	4	6	90
3	3	6	2	86
4	4	1	5	89
5	5	3	1	85
6	6	5	4	98

组号	SDBS质量分数/%	SDS质量分数/%	OA质量分数/%	第五周沉降系数/%
1	1	2	3	81
2	2	4	6	90
3	3	6	2	86
4	4	1	5	89
5	5	3	1	85
6	6	5	4	98