In situ synthesis of hydrophobic magnesium hydroxide nanoparticles in a novel impinging stream-rotating packed bed reactor

›› 2016, Vol. 24 ›› Issue (9): 1306-1312.

• Materials and Product Engineering • 上一篇

In situ synthesis of hydrophobic magnesium hydroxide nanoparticles in a novel impinging stream-rotating packed bed reactor

Hongyan Shen, Youzhi Liu

Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, College of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China

收稿日期:2016-04-08 修回日期:2016-07-18 出版日期:2016-09-28 发布日期:2016-11-11
通讯作者: Youzhi Liu,E-mail address:lyzzhongxin@126.com
基金资助:
Supported by the National Natural Science Foundation of China (No. 21376229).

In situ synthesis of hydrophobic magnesium hydroxide nanoparticles in a novel impinging stream-rotating packed bed reactor

Hongyan Shen, Youzhi Liu

Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, College of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China

Received:2016-04-08 Revised:2016-07-18 Online:2016-09-28 Published:2016-11-11
Supported by:
Supported by the National Natural Science Foundation of China (No. 21376229).

摘要/Abstract

摘要： Hydrophobic Mg(OH)₂ nanoparticles were successfully synthesized via an in situ surface modification method in a novel impinging stream-rotating packed bed (IS-RPB) reactor using oleic acid (C₁₇H₃₃COOH, OA) as a surface modifier, magnesium chloride hexahydrate in the presence of ethanol as a precursor, and sodium hydroxide as a precipitant. The products were characterized by Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and thermogravimetry-differential scanning calorimetry (TG-DSC). Compatibility with organic solutions was determined by sedimentation tests. The prepared nanoparticles exhibited regular hexagonal lamella with an average diameter of 30 nm when OA is added to the reaction system; this result indicates that OA regulates the morphology of the Mg(OH)₂ nanoparticles. XRD revealed that the high-purityMg(OH)₂ product presents a brucite structure, and the I001/I101 of hydrophobic Mg(OH)₂ (0.86) was higher than that of the blank Mg(OH)₂ (0.63). FTIR analysis showed that OA bonded to the surface of the Mg(OH)₂. Comparedwith the blankMg(OH)₂ product, the product obtained through the proposed method possesses excellent hydrophobic properties, including a high water contact angle of 101.4° and good compatibility with liquid paraffin. TG-DSC analysis indicated that the total percentage of mass loss of hydrophobic Mg(OH)₂ (40.88%) was higher than that of the blank Mg(OH)₂ product (33.18%). The in situ surface modification method proposed in this work presents potential use in the large-scale production of Mg(OH)₂ nanoparticles.

关键词: Nanoparticles, Preparation, Surfactants, Magnesium hydroxide, Precipitation

Abstract: Hydrophobic Mg(OH)₂ nanoparticles were successfully synthesized via an in situ surface modification method in a novel impinging stream-rotating packed bed (IS-RPB) reactor using oleic acid (C₁₇H₃₃COOH, OA) as a surface modifier, magnesium chloride hexahydrate in the presence of ethanol as a precursor, and sodium hydroxide as a precipitant. The products were characterized by Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and thermogravimetry-differential scanning calorimetry (TG-DSC). Compatibility with organic solutions was determined by sedimentation tests. The prepared nanoparticles exhibited regular hexagonal lamella with an average diameter of 30 nm when OA is added to the reaction system; this result indicates that OA regulates the morphology of the Mg(OH)₂ nanoparticles. XRD revealed that the high-purityMg(OH)₂ product presents a brucite structure, and the I001/I101 of hydrophobic Mg(OH)₂ (0.86) was higher than that of the blank Mg(OH)₂ (0.63). FTIR analysis showed that OA bonded to the surface of the Mg(OH)₂. Comparedwith the blankMg(OH)₂ product, the product obtained through the proposed method possesses excellent hydrophobic properties, including a high water contact angle of 101.4° and good compatibility with liquid paraffin. TG-DSC analysis indicated that the total percentage of mass loss of hydrophobic Mg(OH)₂ (40.88%) was higher than that of the blank Mg(OH)₂ product (33.18%). The in situ surface modification method proposed in this work presents potential use in the large-scale production of Mg(OH)₂ nanoparticles.

Key words: Nanoparticles, Preparation, Surfactants, Magnesium hydroxide, Precipitation

中图分类号:

10.1016/j.cjche.2016.07.012

Hongyan Shen, Youzhi Liu. In situ synthesis of hydrophobic magnesium hydroxide nanoparticles in a novel impinging stream-rotating packed bed reactor[J]. , 2016, 24(9): 1306-1312.

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In situ synthesis of hydrophobic magnesium hydroxide nanoparticles in a novel impinging stream-rotating packed bed reactor

In situ synthesis of hydrophobic magnesium hydroxide nanoparticles in a novel impinging stream-rotating packed bed reactor

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