Surface modification of seawater desalination reverse osmosis membranes: Characterization studies &amp; performance evaluation

Matin, Asif; Shafi, Hafiz Zahid; Khan, Zafar Hayat; Khaled, Mazen; Yang, Rong; Gleason, Karen K.; Rehman, Faizur

doi:10.1016/j.desal.2013.10.023

Cited by 46 publications

(21 citation statements)

References 42 publications

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“…RMS roughnesses of 12.18 nm and 7.10 nm were found for virgin Koch and Koch membrane modified with 4-VP-co-EGDA copolymer, respectively. This finding agrees with similar reduction in RMS roughness observed in our earlier studies [5,45] and literature conclusions [44,46]. This reduction in RMS roughness is attributed to the unique nature of iCVD that ensures deposition of a very conformal and uniform thickness antifouling layer coating.…”

Section: Afm: Surface Roughness Studiessupporting

confidence: 94%

Surface modification of reverse osmosis membranes with zwitterionic coating for improved resistance to fouling

et al. 2015

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Section: Afm: Surface Roughness Studiessupporting

confidence: 94%

Surface modification of reverse osmosis membranes with zwitterionic coating for improved resistance to fouling

et al. 2015

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“…the O-O bond in peroxides, is thermally cleaved in the gas phase thanks to heating filaments. The most common initiators used in iCVD include tert-butyl peroxide (TBPO), 166 tert-butyl peroxybenzoate (TBPOB), 167 tertamyl peroxide (TAPO), 168 perfluoro-1-butanesulfonyl fluoride (PBSF) 169,170 and perfluorooctanesulfonyl fluoride (PFOS). 171 The radicals formed subsequently initiate chain-growth polymerization of the monomers adsorbed at the surface of the substrate.…”

Section: Icvd Hydrophobization Of Smooth and Rough Surfacesmentioning

confidence: 99%

“…171 The radicals formed subsequently initiate chain-growth polymerization of the monomers adsorbed at the surface of the substrate. Among the large number of monomers investigated, perfluorodecylacrylate (PFDA), 166,[172][173][174] heptadecafluorodecylmethacrylate (HFDMA), 175 perfluoroalkylethylmethacrylate (PFEMA) 157 and hexafluoropropylene oxide (HFPO) 169,170 are particularly important for development of low surface energy polymers.…”

Section: Icvd Hydrophobization Of Smooth and Rough Surfacesmentioning

confidence: 99%

Durable and scalable icephobic surfaces: similarities and distinctions from superhydrophobic surfaces

et al. 2016

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Formation, adhesion, and accumulation of ice, snow, frost, glaze, rime, or their mixtures can cause severe problems for solar panels, wind turbines, aircrafts, heat pumps, power lines, telecommunication equipment, and submarines. These problems can decrease efficiency in power generation, increase energy consumption, result in mechanical and/or electrical failure, and generate safety hazards. To address these issues, the fundamentals of interfaces between liquids and surfaces at low temperatures have been extensively studied. This has lead to development of so called "icephobic" surfaces, which possess a number of overlapping, yet distinctive, characteristics from superhydrophobic surfaces. Less attention has been given to distinguishing differences between formation and adhesion of ice, snow, glaze, rime, and frost or to developing a clear definition for icephobic, or more correctly pagophobic, surfaces. In this review, we strive to clarify these differences and distinctions, while providing a comprehensive definition of icephobicity. We classify different canonical families of icephobic (pagophobic) surfaces providing a review of those with potential for scalable and robust development.

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“…Hydrophilicity helps adhering a thin film of water to the membrane surface, thereby reducing the extent of organic fouling . Hydrophilicity can be induced to a membrane surface by polymer blending, surface reaction, plasma treatment, addition of inorganic materials, etc. However, polymeric blending provides a facile path in engineering tailor made hydrophilic surfaces, suitable for specific separation application.…”

Section: Introductionmentioning

confidence: 99%

Solvent effect and macrovoid formation in cellulose acetate phthalate (CAP)–polyacrylonitrile (PAN) blend hollow fiber membranes

Roy

Bhunia

2016

J of Applied Polymer Sci

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The interactions which govern the morphology of blend hollow fiber membranes is explored in detail in the present work. A hydrophilic (cellulose acetate phthalate) and a relatively hydrophobic polymer (polyacrylonitrile, critical surface tension 47.0 mJ/m 2 ) blend in three solvents, viz., n-methylpyrrolidone (NMP), dimethyl formamide (DMF), and dimethylsulfoxide (DMSO), has been selected as an example to understand the polymeric blend-solvent and nonsolvent interactions. The deviation intrinsic parameter (D h ½ ) is estimated as well as cloud point, linearized cloud point (LCP), and Fourier transform-infrared (FT-IR) analysis have been performed for the blend membranes. The analysis yields that D h ½ is negative for both DMF and NMP indicating miscibility, whereas for DMSO it is positive indicating immiscibility. Cloud point and LCP analysis too reveal DMSO to be the poorest solvent and liquid-liquid demixing is the governing phenomenon for the phase inversion. In depth interaction is conducted with help of FT-IR spectra. The higher red shift of >C@O (1747 to 1665 cm 21 ) after complete phase inversion indicates stronger interaction in DMF and NMP, whereas, no shift in >C@O stretching in DMSO indicates weak or no interaction. This reveals that polymer blend-solvent interaction is weak in case of DMSO than DMF or NMP. These observations manifest in DMSO membranes being most porous, with highest permeability and molecular weight cut off with poor tensile strength. On the other hand, NMP and DMF hollow fiber membranes yields denser structure with better mechanical properties.

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Surface modification of seawater desalination reverse osmosis membranes: Characterization studies & performance evaluation

Cited by 46 publications

References 42 publications

Surface modification of reverse osmosis membranes with zwitterionic coating for improved resistance to fouling

Surface modification of reverse osmosis membranes with zwitterionic coating for improved resistance to fouling

Durable and scalable icephobic surfaces: similarities and distinctions from superhydrophobic surfaces

Solvent effect and macrovoid formation in cellulose acetate phthalate (CAP)–polyacrylonitrile (PAN) blend hollow fiber membranes

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