Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

doi:10.1016/j.cjche.2022.05.006

Chinese Journal of Chemical Engineering ›› 2023, Vol. 55 ›› Issue (3): 59-62.DOI: 10.1016/j.cjche.2022.05.006

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Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

Yingxiang Ni, Can Yuan, Shilong Li, Jian Lu, Lei Yan, Wei Gu, Weihong Xing, Wenheng Jing

State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

Received:2022-03-01 Revised:2022-05-25 Online:2023-06-03 Published:2023-03-28
Contact: Wenheng Jing,E-mail:jingwh@njtech.edu.cn
Supported by:
We sincerely appreciate the support from the National Key Research and Development Program of China (2021YFB3801303), the National Natural Science Foundation of China (21838005, 21921006), and the Key Scientific Research and Development Projects of Jiangsu Province (BE201800901).

Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

Yingxiang Ni, Can Yuan, Shilong Li, Jian Lu, Lei Yan, Wei Gu, Weihong Xing, Wenheng Jing

State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

通讯作者: Wenheng Jing,E-mail:jingwh@njtech.edu.cn
基金资助:
We sincerely appreciate the support from the National Key Research and Development Program of China (2021YFB3801303), the National Natural Science Foundation of China (21838005, 21921006), and the Key Scientific Research and Development Projects of Jiangsu Province (BE201800901).

Abstract

Abstract: Although hydrophilic membranes are desired for reducing resistance to water permeation, hydrophilic surfaces are not used in the water-in-oil (W/O) membrane emulsification process because water spreads on the hydrophilic surface without forming droplets. Here, we report that a hydrophilic ceramic membrane can form a hydrophobic interface in diesel at a higher temperature; interestingly, the experiments show that the contact angle increases when the temperature rises. The hydrophilic membrane surface evolves into a hydrophobic interface, particularly near the boiling point of water, resulting in a water contact angle of 147.5° ±1.2°. This work established a method for preparing W/O monodispersed emulsions by direct emulsification of hydrophilic ceramic membranes at a temperature close to the boiling point of water. Additionally, it made high flux of membrane emulsification of monodispersed W/O emulsions possible, which satisfied the industrial requirements of fluidized catalytic cracking in the petrochemical industry.

Key words: Membrane emulsification, Ceramic membrane, Hydrophobic interface, W/O emulsions

摘要： Although hydrophilic membranes are desired for reducing resistance to water permeation, hydrophilic surfaces are not used in the water-in-oil (W/O) membrane emulsification process because water spreads on the hydrophilic surface without forming droplets. Here, we report that a hydrophilic ceramic membrane can form a hydrophobic interface in diesel at a higher temperature; interestingly, the experiments show that the contact angle increases when the temperature rises. The hydrophilic membrane surface evolves into a hydrophobic interface, particularly near the boiling point of water, resulting in a water contact angle of 147.5° ±1.2°. This work established a method for preparing W/O monodispersed emulsions by direct emulsification of hydrophilic ceramic membranes at a temperature close to the boiling point of water. Additionally, it made high flux of membrane emulsification of monodispersed W/O emulsions possible, which satisfied the industrial requirements of fluidized catalytic cracking in the petrochemical industry.

关键词: Membrane emulsification, Ceramic membrane, Hydrophobic interface, W/O emulsions

Yingxiang Ni, Can Yuan, Shilong Li, Jian Lu, Lei Yan, Wei Gu, Weihong Xing, Wenheng Jing. Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions[J]. Chinese Journal of Chemical Engineering, 2023, 55(3): 59-62.

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Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

Temperature-induced hydrophobicity transition of MXene membrane for directly preparing W/O emulsions

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