Superwettable Janus nylon membrane for multifunctional emulsion separation

Zheng, Longzhu; Li, Hongqiang; Lai, Xuejun; Huang, Wei; Lin, Zengyue

doi:10.1016/j.memsci.2021.119995

Cited by 50 publications

(15 citation statements)

References 49 publications

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“…It was mainly attributed to the introduction of the low-surface-energy C24-28 HSO containing long alkyl chains. 47,48 Additionally, from the corresponding SEM images in Figure 13, compared with blank CF, the surface roughness of the CFs finished by BPU and BPU@C24-28 HSO changed little. Therefore, the low surface energy of the finished CF provided by water-repellent agent was the crucial factor for the obvious improvement of the hydrophobicity.…”

Section: Surface Stability and Softness Of The Finished Cfsmentioning

confidence: 99%

Bio‐based fluorine‐free branched polyurethane@organosilicon water‐repellent agent for cotton fabric

Huang

Meng²,

et al. 2023

J of Applied Polymer Sci

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In recent years, with the increasing consciousness on environment protection, fluorine‐free water‐repellent agents in textile industry have attracted considerable attention. Herein, we proposed a new strategy to prepare bio‐based fluorine‐free branched polyurethane@organosilicon water‐repellent agent for cotton fabric (CF). Branched polyurethane (BPU) with long alkyl chains was firstly synthesized through the reaction of glycerin monostearate extracted from natural palm fruit, toluene diisocyanate, trimethylopropane and N‐methyl diethanolamine, and then utilized to coat the C24‐28 olefin modified hydroxyl silicone oil (C24‐28 HSO) by emulsification procedure to obtain branched polyurethane@organosilicon (BPU@C24‐28 HSO) water‐repellent agent. Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy confirmed the chemical structures of BPU, C24‐28 HSO and BPU@C24‐28 HSO water‐repellent agent. The biomass carbon content of the water‐repellent agent reached 54.0%. Transmission electron microscope demonstrated that the BPU@C24‐28 HSO water‐repellent agent appeared obvious spherical shape with core‐shell structure. Owing to the introduction of organosilicon, the water‐repellent agent significantly improved the softness of the CF. In addition, the CF finished by the BPU@C24‐28 HSO water‐repellent agent also exhibited excellent water‐repellent score of 90+, high water contact angle of 141.6° and superior surface stability. Our findings provided a direction to prepare environmental‐friendly and high‐performance water‐repellent agents for various fabrics.

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Section: Surface Stability and Softness Of The Finished Cfsmentioning

confidence: 99%

Bio‐based fluorine‐free branched polyurethane@organosilicon water‐repellent agent for cotton fabric

Huang

Meng²,

et al. 2023

J of Applied Polymer Sci

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“…JHFM continuously could separate surfactant-stabilized oil-in-water emulsions with efficiency up to 99%. Zheng et al [ 48 ] successfully prepared a Janus nylon membrane with super-hydrophilic/super-oleophobic properties on the front side and super-hydrophobic/submerged super-oleophobic properties on the back side as shown in Figure 4 c. In this work, asymmetric chemical modification was conducted with dodecyl mercaptan and L-cysteine on the positive and negative surfaces, respectively. The Janus nylon membrane separated oil-in-water and water-in-oil emulsions on both sides with efficiencies over 99%.…”

Section: Preparation Of Asymmetric Wettable Janus Materialsmentioning

confidence: 99%

Advances in Asymmetric Wettable Janus Materials for Oil–Water Separation

et al. 2022

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The frequent occurrence of crude oil spills and the indiscriminate discharge of oily wastewater have caused serious environmental pollution. The existing separation methods have some defects and are not suitable for complex oil–water emulsions. Therefore, the efficient separation of complex oil–water emulsions has been of great interest to researchers. Asymmetric wettable Janus materials, which can efficiently separate complex oil–water emulsions, have attracted widespread attention. This comprehensive review systematically summarizes the research progress of asymmetric wettable Janus materials for oil–water separation in the last decade, and introduces, in detail, the preparation methods of them. Specifically, the latest research results of two-dimensional Janus materials, three-dimensional Janus materials, smart responsive Janus materials, and environmentally friendly Janus materials for oil–water separation are elaborated. Finally, ongoing challenges and outlook for the future research of asymmetric wettable Janus materials are presented.

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“…17,18 Therefore, scientists have devoted a lot of work to the preparation of membranes that can separate oil-water emulsions. [19][20][21] For example, Zeng and co-workers prepared a zein-based fiber membrane via electrospinning and electrospraying methods for efficiently separating several kinds of oil/water emulsions. 22 Han and co-workers fabricated a spiderweb-inspired membrane with superior oil-in-water emulsion separation ability through electrospinning polyacrylonitrile and sulfydryl-functionalized.…”

Section: Introductionmentioning

confidence: 99%