Gravity-driven ultrafast separation of water-in-oil emulsion by hierarchically porous electrospun Poly(L-lactide) fabrics

Zhao, Jianlong; Wang, Wao; Ye, Cuicui; Li, Yongjin; You, Jichun

doi:10.1016/j.memsci.2018.06.053

Cited by 87 publications

(26 citation statements)

References 36 publications

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“…In our previous work, a novel strategy has been developed to fabricate porous structures according to the crystallization template with the help of extraction, which is not only a facile way to prepare porous membranes but also an efficient method to re‐construct the distribution of two components in their blend. [ 18–22 ] On the one hand, the localization of amorphous component in inter‐ or inner‐spherulitic regions leads to different mechanical performance of the resultant porous membranes. The increase in inter‐spherulites fraction corresponds to lower stress and elongation at break due to the poor connectivity among neighboring spherulites [ 23 ] ; on the other hand, the fraction of amorphous component in inner‐spherulitic regions can be assessed by means of long periods in SAXS.…”

Section: Introductionmentioning

confidence: 99%

Inter‐spherulitic/inner‐spherulitic localization of PBSU during crystallization of PVDF in PVDF/PBSU blend

Cao

Wang

et al. 2020

Journal of Polymer Science

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In this work, the miscibility effect on the localization of poly(butylene succinate) (PBSU) during the crystallization of PVDF in their blend has been investigated. After annealed at 200 °C and 240 °C, homogeneous and phase‐separated structures can be obtained respectively, which was followed by isothermal crystallization at 141 °C. In the case of 200°C, PBSU tends to enrich in inner‐spherulitic regions because of the excellent miscibility of the blend and the higher growth rate of PVDF crystals. When the specimen was annealed at 240 °C, phase separation produces PVDF and PBSU domains. Upon cooling to 141 °C, one part of PBSU is miscible with , while the other part of it remains as phase‐separated domains due to the high viscosity and slow relaxation of them. The former accounts for the distribution of PBSU in inner‐spherulitic regions. In the latter, however, phase‐separated structures depress the diffusion of PVDF during its crystallization, leading to the lower magnitude of growth rate of spherulites. Both of them contribute to the localization of PBSU in inter‐spherulitic regions. The distribution of PBSU among PVDF spherulites has been validated by long periods, pore size, and mechanical performance of the porous PVDF membranes.

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Section: Introductionmentioning

confidence: 99%

Inter‐spherulitic/inner‐spherulitic localization of PBSU during crystallization of PVDF in PVDF/PBSU blend

Cao

Wang

et al. 2020

Journal of Polymer Science

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“…Over the past decades, a variety of technologies have been established for eliminating such pollutants, including in situ burning, gravity separation, air flotation, coagulation, bio‐remediation, electrochemical treatment, filtration, and absoportion . However, the using of absorbent materials has been considering as one of the efficient methods compared with other technologies, which were suffered from low‐separation efficiency, high operation cost, secondary pollution, poor materials stability, and recyclability.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical superhydrophobic surfaces for oil–water separation via a gradient of ammonia content controlling of dopamine oxidative self‐polymerization

Wen

Lei

Chen

et al. 2019

J of Applied Polymer Sci

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Superhydrophobic three-dimensional porous materials have been considering as one of the most promising candidate absorbents for removal and collection of oil spills or organic contaminants from water. In this work, we report a novel and straightforward method for construction of hierarchical superhydrophobic surfaces on the commercial melamine sponge by controlling of the dopamine oxidative selfpolymerization via a gradient of ammonia content. The surface roughness of the sponge was enhanced by the deposited polydopamine coatings whose surfaces exhibited different morphologies at solutions of varied ethanol-ammonia ratios. Thereafter the low-surface free energy moieties were decorated on the surfaces by utilizing a secondary modification platform of polydopamine. Correspondingly, the obtained superhydrophobic melamine sponge achieved a water contact angle of 162.6 AE 1. Furthermore, the superhydrophobic sponge exhibited excellent absorption performances and extraordinary recyclabilities toward a variety of oils and organic solvents. These findings presented in this study offer an effective and versatile approach for oil spills and organic solvents containment removal and environmental remediation in more fundamental and practical fields.

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“…You et al, reported a poly(L-lactide) membrane with nanopores on the nanofibers by mixing poly(ethylene oxide) (PEO) in the spinning solution and etching PEO off after direct electrospinning. [122] The resultant nanofibers are left with intersected channels that contribute to 20% higher oil permeability during the separation process.…”

Section: Polymeric Electrospun Membranesmentioning

confidence: 99%

Dual-functional superwettable nano-structured membrane: From ultra-effective separation of oil-water emulsion to seawater desalination

Chen

Liu

Wang

et al. 2021

Chemical Engineering Journal

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Many research works are striving to purify oil contaminated wastewater. Membrane with distinct affinity toward oil or water is one of the most promising method for oil-induced wastewater treatment. However, with the emulsifier present in most wastewater, the immiscible oil/water mixture is more difficult to be separated. Meanwhile, making use of the most abundant resource of seawater, solar vapour generation has emerged as a sustainable method for water distillation.However, traditional solar steam technologies still rely on expensive or cumbersome optical infrastructure or suffer from low energy efficiency. A water purification system with the ability to treat industrial oily wastewater and distill seawater is yet to be developed. In this thesis, a robust electrospun nanofibrous poly(vinyl alcohol) membrane (NPM) decorated with slow oxidization of polypyrrole nanoparticles was synthesized to realise dual-functional water purification. Scanning electron microscopy (SEM) was utilized to characterize the morphology of the NPM. Fourier-transform infrared spectroscopy (FTIR) was used to verify the chemical composition of the NPM. Contact angle tests were carried out to validate superhydrophilicity/underwater superoleophobicity of the NPM. Repeated oil/water emulsion separation tests were conducted to obtain the results of separation efficiency, separation flux and anti-fouling property of the NPM. UV-vis was utilized to test the light absorption ability of the NPM. Simulated sun tester was used to test the solar vapor generation capacity of the NPM. In summary, the NPM is capable of separating sundry organic solvents-water emulsions with a separation efficiency of over 99.99%. The NPM is also capable of desalinating the seawater under one sun solar radiation with an evaporation rate of 2.87 kg m -2 h -1 . II AcknowledgementsExtensive thanks must be given to Dr. Malcolm Xing of the Department of Mechanical Engineering at University of Manitoba for his much appreciated guidance and academic support throughout my studies, without whom this research work would not be conducted successfully.I would also like to thank the rest of my thesis committee: Dr. Subramaniam Balakrishnan and Dr. Qingjin Peng for their insightful comments and inspiration.Thanks also to Dr. Wen Zhong and Dr. Yuqing Liu for their support in many of the practical elements of this work as well as the technical trainings.My thanks also go to my lab mates for their insights from our discussions and assistance during the experiments.Last but not least, my thanks go to my friends and family for their unconditional support during my graduate study. III

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Gravity-driven ultrafast separation of water-in-oil emulsion by hierarchically porous electrospun Poly(L-lactide) fabrics

Cited by 87 publications

References 36 publications

Inter‐spherulitic/inner‐spherulitic localization of PBSU during crystallization of PVDF in PVDF/PBSU blend

Inter‐spherulitic/inner‐spherulitic localization of PBSU during crystallization of PVDF in PVDF/PBSU blend

Hierarchical superhydrophobic surfaces for oil–water separation via a gradient of ammonia content controlling of dopamine oxidative self‐polymerization

Dual-functional superwettable nano-structured membrane: From ultra-effective separation of oil-water emulsion to seawater desalination

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