Amphiphobic PVDF composite membranes for anti-fouling direct contact membrane distillation

Lu, Xuemei; Peng, Yongbo; Ge, Lei; Lin, Rijia; Zhu, Zhonghua; Liu, Shaomin

doi:10.1016/j.memsci.2015.12.042

Cited by 149 publications

(48 citation statements)

References 40 publications

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“…With the increase of nano-graphite concentration in the PVDF/PVC dope solution, the CA increases first and then decreases with the increases in the nano-graphite concentration, contributed to the decrease of SEF first and then increases. At M-1, a good hydrophobic surface with a SFE of 18.97mN·m −1 was obtained, which was consistent with the result that the water CA value is very low [20].…”

Section: Hydrophobic Properties Of Composite Membranesupporting

confidence: 89%

Preparation of hydrophobic PVDF/PVC/nano-graphite composite membrane and its self-cleaning properties

Zhang

et al. 2020

Mater. Res. Express

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In this study, novel physical blending modified membranes are prepared using the non-solvent induced phase separation method, the influences of nano-graphite and Poly(vinyl chloride) (PVC) incorporated into the hydrophobic performance of the polyvinylidene fluoride (PVDF) membrane were investigated. The composite membrane was prepared not only reduces the cost of producing PVDF membrane, but also enhances the hydrophobicity of the membrane. The addition of nano graphite and PVC accelerated the phase transformation of PVDF and changed the crystal structure of PVDF. Therefore, the surface roughness of the composite membrane is changed, and the hydrophobicity of the composite membrane is enhanced compared with the original PVDF membrane. the crystal structure and crystallinity of the composite membranes can be analyzed by WAXD and DSC, the surfaces morphology of the composite membranes were characterized by SEM and AFM, the wetting and hydrophobicity of the composite membrane by CA and SFE. The experimental results show that adding a small amount of nano inorganic substance (nano graphite) to the (PVDF-PVC) blend polymer is an effective method to prepare and improve the hydrophobic performance of the blend polymer membrane. The PVDF-PVC/nano-graphite prepared in the experiment not only improves the hydrophobic performance of the PVDF membrane, but also reduces the cost of the composite membrane through the addition of PVC. Meanwhile, the membrane has a durable self-cleaning performance, which widens the applications of PVDF membranes.

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Section: Hydrophobic Properties Of Composite Membranesupporting

confidence: 89%

Preparation of hydrophobic PVDF/PVC/nano-graphite composite membrane and its self-cleaning properties

Zhang

et al. 2020

Mater. Res. Express

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“…While the concentration of ZIF‐7 was equal to 3 and 5 wt%, wrinkles and cracks were displayed on the surface of M(3) and M(5), which were in accordance with the FE‐SEM images shown in Figure , and the roughness of M(3) and M(5) decreased significantly compared to M(2). As a matter of fact, hierarchical micro/nanostructures, open pores, sponge‐like layer structures, and the formation of bigger nodules had a strong impact on the surface roughness; meanwhile, the surface roughness played important roles in membrane hydrophobicity . The increased surface roughness would reduce the contact area between water molecules and the membrane surface, which would increase the WCA and further improve the antiwetting property …”

Section: Resultsmentioning

confidence: 99%

Regulation of the microstructure of polyvinylidene fluoride membrane via incorporation of nano‐ZIF‐7 for improving hydrophobicity and antiwetting performance

Wang

Shi

et al. 2019

J Chinese Chemical Soc

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The design and fabrication of a membrane with super hydrophobicity and antiwetting property is of great importance for improving membrane performance in distillation, desalination, gas absorption, and separation. In this work, polyvinylidene fluoride (PVDF) membranes were modified by Zeolitic Imidazolate Framework-7 (ZIF-7) nanocrystals to improve the hydrophobic property and antiwetting performance. ZIF-7/PVDF hybrid membranes were prepared via the nonsolvent-induced phase separation (NIPS) method. Different concentrations of ZIF-7 nanocrystals (0, 0.5, 1, 2, 3, and 5 wt%) were introduced into the PVDF dope solution, and the physical structure of the resulting membranes were systematically characterized. Due to the hydrophobic nature of ZIF-7 nanocrystals, the solventnonsolvent exchange rate had been regulated effectively during phase inversion.The morphology of top and bottom surfaces, together with the inner structures of the hybrid membrane, has been changed obviously, showing a more twisted fingerlike macrovoid layer and a thicker sponge-like layer compared to pristine PVDF membrane. Furthermore, the hydrophobicity and antiwetting properties of these hybrid membranes improved obviously when the incorporated concentration of ZIF-7 was higher than 1 wt%. The M(2) membrane, which possessed the highest surface roughness and water contact angles, showed the best antiwetting property and recovered gas permeance ratio (>95%) after being immersed in aqueous solution for 10 hr. K E Y W O R D Santiwetting, hydrophobic, membrane, metal-organic framework, morphology, nanomaterials

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“…In addition, two small melting peaks in the DSC curves were observed at about 170 °C, which resulted from the melting of ordered structures formed by long fluorocarbon side chains. After annealing over 170 °C for several minutes, long fluorine chains were guaranteed rearranged to the surface due to its spontaneous enrichment to fabric‐air interface . The annealing influence on the hydrophobicity of those latex films was also discussed in Supporting Information (see Supporting Information Figure S3).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, fluoropolymers are always used in various areas such as the fabrication of hydrophobic surfaces, antifouling, medical chemistry, filtration, and other applications . Among all those applications of fluoropolymer, hydrophobic modification consisting of water and oil repellency of textiles and building materials, membrane distillation and fabrication of superhydrophobic surfaces are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of sulfonyl fluorinated macro emulsifier for low surface energy emulsion polymerization application

Yin

Song

Liang

et al. 2017

J of Applied Polymer Sci

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Fluorinated acrylate emulsions have been extensively applied for hydrophobic surface coatings. To obtain fluorinated emulsions of low surface energy, amphiphilic sulfonyl macro emulsifiers consisting of 2-(perfluorohexyl) ethyl acrylate (PFHEA) and 2-acrylanmido-2-methylpropanesulfonic acid (AMPS) were designed via radical polymerization and subsequently used for the emulsion copolymerization of PFHEA, methyl methacrylate (MMA), and methyl butyl acrylate (MBA). Under optimum synthesis conditions, the emulsifier displayed superior emulsification properties such as high monomer conversion, small particle size, and excellent stability compared with conventional emulsifiers. The corresponding emulsions with sulfonyl macro emulsifiers exhibited extreme low surface energy (9.8 mN/m) and outstanding hydrophobicity due to high contents of fluorinated chains, as well as thimbleful hydrophilic sulfonyl groups, which shows the great potential in water repellent modification application.

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Amphiphobic PVDF composite membranes for anti-fouling direct contact membrane distillation

Cited by 149 publications

References 40 publications

Preparation of hydrophobic PVDF/PVC/nano-graphite composite membrane and its self-cleaning properties

Preparation of hydrophobic PVDF/PVC/nano-graphite composite membrane and its self-cleaning properties

Regulation of the microstructure of polyvinylidene fluoride membrane via incorporation of nano‐ZIF‐7 for improving hydrophobicity and antiwetting performance

Synthesis of sulfonyl fluorinated macro emulsifier for low surface energy emulsion polymerization application

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