Electrospun Poly(Styrene-<i>block</i>-dimethylsiloxane) Block Copolymer Fibers Exhibiting Superhydrophobicity

Ma, Minglin; Hill, Randal M.; Lowery, Joseph L.; Fridrikh, Sergey V.; Rutledge, Gregory C.

doi:10.1021/la047064y

Cited by 487 publications

(310 citation statements)

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“…The resulting surfaces were a mixture of fibres and beaded fibres and maximum contact angles were achieved for a heavily beaded surface produced by the spinning of a low viscosity (low molecular weight) polymerthereby achieving hydrophobicity via a combination of surface roughness and the use of a low surface energy comomomer. Ma 22 describes low surface energy fibres produced by electrospinning polystyrene -polydimethylsiloxane block copolymers which were contaminated with polystyrene homopolymer (arising from the block copolymer synthesis). The actual composition of the polymer was 77% block copolymer and 23% polystyrene homopolymer, and the volume fraction of siloxane in this blend was 43%.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning Superhydrophobic Fibers Using Surface Segregating End-Functionalized Polymer Additives

et al. 2011

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. (2011) 'Electrospinning superhydrophobic bers using surface segregating end-functionalized polymer additives. ', Macromolecules., 44 (16). pp. 6461-6470. Further information on publisher's website:http://dx.doi.org/10.1021/ma200852zPublisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in Macromolecules, copyright c 2011 American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://dx.doi.org/10.1021/ma200852z. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. RECEIVED DATE (to be automatically inserted after your manuscript is accepted if requiredaccording to the journal that you are submitting your paper to) † Chemistry Department, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.ABSTRACT: We describe here a facile route for the in situ modification of the surface properties of fibres produced by electrospinning polystyrene containing small quantities of compatible polymer additives, end functionalized with 1-3 fluoroalkyl groups. Such additives undergo spontaneous surface segregation during the electrospinning process resulting in fibres with low surface energy, fluorine rich, superhydrophobic surfaces. Surface properties were analyzed using static contact angle measurements (with water as the contact fluid) and X-ray photoelectron spectroscopy. We report the effect of a number of parameters on the surface properties of the resulting polystyrene fibres including the molecular weight and concentration of functionalized additive, the number of fluoroalkyl groups, the effect of annealing and spinning solvent. The majority of the fibres were successfully produced using THF as the spinning 2 solvent and fibres with a contact angle of approximately 150 degrees were attainable. However, preliminary investigations using a blend of polystyrene and 4% by weight of such an additive, endfunctionalized with 3 C 8 F 17 group in a mixed solvent of DMF/THF (3:1 v/v) resulted in a mat of fibres with a superhydrophobic surface and a contact angle of 158 degrees.

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Section: Introductionmentioning

confidence: 99%

Electrospinning Superhydrophobic Fibers Using Surface Segregating End-Functionalized Polymer Additives

et al. 2011

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“…[4,5]. These unique properties have triggered a broad range of potential applications, including nanocomposites [6], scaffolds for tissue engineering [7], sensors [8], protective clothing and filtration membranes [9], magneto-responsive fibers [10], superhydrophobic membranes [11], and especially drug delivery [12].…”

Section: Introductionmentioning

confidence: 99%

Gallic Acid-loaded Cellulose Acetate Electrospun Nanofibers: Thermal Properties, Mechanical Properties, and Drug Release Behavior

Phiriyawirut¹,

Phaechamud²

2012

OJPChem

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“…1−3 The Cassie state of wetting provides a large apparent water contact angle with low contact-angle hysteresis and results in a roll-off superhydrophobic surface, which is desired for practical applications such as self-cleaning windows and solar panels, 4−6 underwater drag reduction, 7,8 and anticorrosion coatings. 9 Various successful methods have been developed by mimicking well-known examples from nature (e.g., Lotus leaves and butterfly wings) to prepare artificial superhydrophobic surfaces with the Cassie state of wetting using lithographic methods, 10−12 sol−gel techniques, 4,9,13−15 phase separation in polymer blends, 16 electrospinning, 17,18 and others. 5,19−23 However, the Cassie state of wetting (roll-off) can easily and irreversibly transform to the Wenzel state of wetting (sticky) under external stimuli such as pressure, vibration, droplet impact, and droplet evaporation by complete filling of the air pockets with water.…”

Section: ■ Introductionmentioning

confidence: 99%

Robust Cassie State of Wetting in Transparent Superhydrophobic Coatings

Tuvshindorj

Yıldırım

Öztürk

et al. 2014

ACS Appl. Mater. Interfaces

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This paper investigates the stability of the Cassie state of wetting in transparent superhydrophobic coatings by comparing a single-layer microporous coating with a doublelayer micro/nanoporous coating. Increasing pressure resistance of superhydrophobic coatings is of interest for practical use because high external pressures may be exerted on surfaces during operation. The Cassie state stability against the external pressure of coatings was investigated by squeezing droplets sitting on surfaces with a hydrophobic plate. Droplets on the single-layer coating transformed to the Wenzel state and pinned to the surface after squeezing, whereas droplets on the double-layer micro/nanoporous coating preserved the Cassie state and rolled off the surface easily. In addition, the contact angle and contact-line diameter of water droplets during evaporation from surfaces were in situ investigated to further understand the stability of coatings against Wenzel transition. A droplet on a microporous coating gradually transformed to the Wenzel state and lost its spherical shape as the droplet volume decreased (i.e., the internal pressure of the droplet increased). The contact line of the droplet during evaporation remained almost unchanged. In contrast, a water droplet on a double-layer surface preserved its spherical shape even at the last stages of the evaporation process, where pressure differences as high as a few thousand pascals were generated. For this case, the droplet contact line retracted during evaporation and the droplet recovered the initial water contact angle. The demonstrated method for the preparation of robust transparent superhydrophobic coatings is promising for outdoor applications such as self-cleaning cover glasses for solar cells and nonwetting windows. KEYWORDS: Cassie state stability, superhydrophobic, self-cleaning, wettability, evaporation, organically modified silica ■ INTRODUCTIONA water droplet sitting on a superhydrophobic surface (i.e., the water contact angle is >150°) can be in either the Wenzel or Cassie state depending on the morphology and chemistry of the surface. In the Wenzel state, the surface is completely wetted and the droplet pins to the surface, whereas in the Cassie state, the droplet wets the surface partially and air pockets form between the surface and water droplet. 1−3 The Cassie state of wetting provides a large apparent water contact angle with low contact-angle hysteresis and results in a roll-off superhydrophobic surface, which is desired for practical applications such as self-cleaning windows and solar panels, 4−6 underwater drag reduction, 7,8 and anticorrosion coatings. 9 Various successful methods have been developed by mimicking well-known examples from nature (e.g., Lotus leaves and butterfly wings) to prepare artificial superhydrophobic surfaces with the Cassie state of wetting using lithographic methods, 10−12 sol−gel techniques, 4,9,13−15 phase separation in polymer blends, 16 electrospinning, 17,18 and others. 5,19−23 However, the Cassie state of ...

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Electrospun Poly(Styrene-block-dimethylsiloxane) Block Copolymer Fibers Exhibiting Superhydrophobicity

Cited by 487 publications

References 58 publications

Electrospinning Superhydrophobic Fibers Using Surface Segregating End-Functionalized Polymer Additives

Electrospinning Superhydrophobic Fibers Using Surface Segregating End-Functionalized Polymer Additives

Gallic Acid-loaded Cellulose Acetate Electrospun Nanofibers: Thermal Properties, Mechanical Properties, and Drug Release Behavior

Robust Cassie State of Wetting in Transparent Superhydrophobic Coatings

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