Perfluorinated Polymer Monolayers on Porous Silica for Materials with Super Liquid Repellent Properties

Jung, Dae Soo; Park, In Jun; Choi, Young Kook; Lee, Soo-Bok; Park, Hyung Sang; Rühe, Jürgen

doi:10.1021/la025558u

Cited by 71 publications

(73 citation statements)

References 24 publications

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“…81 Covalent attachment of the polymer molecules to the substrate surfaces was achieved by generation of the polymer chains through surface-initiated radicalchain polymerization process. To start the polymerization reaction in situ, self-assembled monolayers of azo initiators were attached to SiO 2 substrates.…”

Section: Electrochemical Polymerization and Electrochemical Depositionmentioning

confidence: 99%

Recent developments in polymeric superoleophobic surfaces

Zhang

Liu

Jiang

2012

J Polym Sci B Polym Phys

223

168

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The construction and application of superoleophobic surfaces have aroused worldwide interest during the past few years. These surfaces are of great significance not only for fundamental research but also for various practical applications in self-cleaning, oil-repellent coatings, and antibioadhesion. The unique properties of polymers have made them one of the most important materials for constructing superoleophobic materials. This article reviews recent developments in the design, fabrication, and application of polymeric superoleophobic surfaces.

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Section: Electrochemical Polymerization and Electrochemical Depositionmentioning

confidence: 99%

Recent developments in polymeric superoleophobic surfaces

Zhang

Liu

Jiang

2012

J Polym Sci B Polym Phys

223

168

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“…0. 15 . Bragg diffractions from crystallographic planes perpendicular to the substrate were obtained from the surface and bulk regions at i of 0.08 and 0.16, respectively.…”

Section: Measurementsmentioning

confidence: 99%

“…15 Over the last decade, high-density and well-defined polymer brushes have been readily synthesized, since controlled polymerization techniques have been exploited for surface-initiated polymerization. Atom transfer radical polymerization (ATRP), which is a type of the living radical polymerization, has been widely employed for the formation of polymer brushes because ATRP is compatible with various functionalized monomers.…”

mentioning

confidence: 99%

Molecular Aggregation State of Surface-grafted Poly{2-(perfluorooctyl)ethyl acrylate} Thin Film Analyzed by Grazing Incidence X-ray Diffraction

Yamaguchi

Honda

Kobayashi

et al. 2008

Polym J

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Surface-initiated atom transfer radical polymerization of 2-(perfluorooctyl)ethyl acrylate on a flat silicon wafer was carried out to give poly{2-(perfluorooctyl)ethyl acrylate} (PFA-C 8 ) brush thin film with three different thicknesses of 4, 11, and 43 nm, respectively. The water contact angle of the PFA-C 8 brush surface was 120. The molecular aggregation state of the perfluoroalkyl (R f ) group of PFA-C 8 brush was analyzed by X-ray reflectivity (XR), wide-angle X-ray diffraction, and grazing incidence X-ray diffraction (GIXD) measurements. XR analysis revealed that R f groups at the air/brush interface formed a densely packed structure, while a relatively low-density region was generated at the brush/substrate interface. The peaks of in-plane GIXD for brush films with thicknesses of 11 and 43 nm were observed at q xy ¼ 12:5 nm À1 , which indicated that R f groups at the outermost surface oriented perpendicular to the surface of silicon substrate. In an out-of-plane diffraction profile of the 43 nm-thick PFA-C 8 brush film, peaks corresponding to a periodic length of the bilayer lamellae were observed. Therefore, R f groups of the thicker brush film were crystallized and formed ordered bilayer lamellar structure at the outermost surface. In contrast, no diffraction pattern was observed from the PFA-C 8 at a thickness of 4 nm by WAXD and GIXD. These results indicate that an amorphous layer was formed at the interface of the brush/substrate. The R f groups at the anchoring region of the brush could not form a sufficiently ordered structure due to immobilization of brush chain ends on the substrate. It was suggested that the R f groups in a PFA-C 8 brush thin film at the outermost surface aggregated in a different manner from those in the anchoring region.KEY WORDS: Perfluoroalkyl Acrylate / Polymer Brush / Water-Repellant Surface / X-Ray Reflectivity / Grazing Incidence X-ray Diffraction / Surface-initiated Polymerization / It has been well-known that polymers with perfluoroalkyl (R f ) groups show excellent chemical and thermal stability, nonadhesive properties, low friction coefficients, low surface free energy, and antifouling behavior. These properties of fluorinated polymers are primarily caused by unique C-F bonds which have a large binding energy and quite a low dielectric constant due to short bonding distance between carbon and fluorine atom with high electro negativity. However, the surface component, orientation packing, and end groups also affect the surface behavior of the polymer films.1-3 When the surface is uniformly covered with trifluoromethyl (CF 3 ) groups, 4 excellent water repellency and a very low energy surface can be achieved. 5 In the case of poly(fluoroalkyl acrylate)s with long R f groups, the molecular aggregation state of the R f groups at the side chains affects the surface wettablity. 6,7 We have recently reported the relationship between the molecular aggregation states and the water repellency of poly(perfluoroalkyl acrylate) (PFA-C y , where y is the number of fluoromethylene...

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“…Although wetting prevention in MD is the main process requirement, it has not been comprehensively studied and relatively few investigations have attempted to solve the wetting problems in MD membranes [12][13][14][15][16][17][18][19][20]. Some authors have investigated the improvement of hydrophobic properties of membranes employing novel materials or applying surface modification through manipulating surface chemistry and surface geometry by nanoparticle coating and surface fluorination [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Wetting prevention in membrane distillation through superhydrophobicity and recharging an air layer on the membrane surface

Rezaei

Warsinger

Lienhard

et al. 2017

Journal of Membrane Science

116

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Although membrane distillation offers distinctive benefits in some certain areas, i.e., RO concentrate treatment, concentrating solutions in the food industry and solar heat utilization, the occurrence of wetting of the hydrophobic membrane hinders its potential industrial applications.Therefore, wetting prevention is a vital criterion for the treatment of solutions with lower surface tension than water. The present work examines the effect of recharging air bubbles on the membrane surface for the wetting incidence when a surfactant (sodium dodecyl sulfate, SDS) exists in a highly concentrated NaCl aqueous solution. This study shows that the presence of the air bubbles on the surface of the superhydrophobic membrane in a direct contact membrane distillation setup inhibited the occurrence of wetting (~100% salt rejection) even for high concentrations of the surface-active species (up to 0.8 mM SDS) in the feed solution while no undesirable influence on the permeate flux was observed. Introducing air into the feed side of the membrane displaces the liquid which partly tends to penetrate the macroporous structure with air bubbles and therefore increases the liquid entry pressure, and in addition, the simultaneous use of a superhydrophobic membrane enhances the solution contact angle.

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Perfluorinated Polymer Monolayers on Porous Silica for Materials with Super Liquid Repellent Properties

Cited by 71 publications

References 24 publications

Recent developments in polymeric superoleophobic surfaces

Recent developments in polymeric superoleophobic surfaces

Molecular Aggregation State of Surface-grafted Poly{2-(perfluorooctyl)ethyl acrylate} Thin Film Analyzed by Grazing Incidence X-ray Diffraction

Wetting prevention in membrane distillation through superhydrophobicity and recharging an air layer on the membrane surface

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