Super-Repellent Composite Fluoropolymer Surfaces

Coulson, S. R.; Woodward, and I. S.; Badyal, J. P. S.; and, S. A. Brewer; Willis, Caroline

doi:10.1021/jp0000174

Cited by 274 publications

(184 citation statements)

References 51 publications

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“…24 This is because oils possess significantly lower surface tension values than water and consequently spread on most natural and synthetic surfaces. Previous work [25][26][27][28][29][30][31][32][33][34][35] has explained how re-entrant surface texture, in conjunction with surface chemistry and roughness, can be used to engineer superoleophobic surfaces, even with extremely low surface tensions liquids such as various oils and alcohols. In this article, the authors discuss the roles of surface energy and roughness, the critical role of re-entrant texture and the role of hierarchical texture in fabricating superoleophobic surfaces.…”

Section: Introductionmentioning

confidence: 99%

Superoleophobic surfaces: design criteria and recent studies

Kota

Mabry²,

Tuteja

2013

Surface Innovations

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Section: Introductionmentioning

confidence: 99%

Superoleophobic surfaces: design criteria and recent studies

Kota

Mabry²,

Tuteja

2013

Surface Innovations

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“…Recently many methods have been developed to fabricate such superhydrophobic surfaces [5], [6], [7], [8], [9] and [10]. Erbil et al [5] described a simple and inexpensive method for forming a superhydrophobic coating using polypropylene and a suitable selection of solvents and temperatures to control the surface roughness.…”

mentioning

confidence: 99%

“…Onda et al [7] achieved a contact angle of 174° on the surface of the fractal structure of alkylketene. Other methods include the sol-gel process to generate a porous rough surface [8], the anodic oxidation of aluminum surfaces [9] and plasma polymerization [10]. In many of these cases, a rough surface was initially created, which was then coated with a low surface energy thin film to enhance superhydrophobicity.…”

mentioning

confidence: 99%

Superhydrophobic properties of ultrathin rf-sputtered Teflon films coated etched aluminum surfaces

2008

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Superhydrophobicity has been demonstrated on ultrathin rf-sputtered Teflon coated etched aluminum surfaces. The etching of aluminum surfaces has been performed using dilute hydrochloric acid. An optimized etching time of 2.5 min is found to be essential, before Teflon coating, to obtain a highest water contact angle of 164 ± 3° with a lowest contact angle hysteresis of 2.5 ± 1.5°, with the water drops simply rolling off these surfaces with even the slightest inclination of the sample. The presence of − CF3 radicals along with − CF2 radicals in the ultrathin rf-sputtered Teflon films, as investigated by X-ray photoelectron spectroscopy (XPS), contributes to the lowering of the surface energy on the aluminum surfaces. The presence of patterned microstructure as revealed by field emission scanning electron microscope (FESEM) together with the low surface energy ultrathin rf-sputtered Teflon films renders the aluminum surfaces highly superhydrophobic.

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“…The middle layer of meltblown non-woven material was used as received but the outer layers were additionally rendered liquid repellent by a fluorocarbon coating prior to the construction of the three-layered nonwoven material. Coating the materials with a fluorocarbon was achieved by the deposition (plasmaassisted polymerisation) of a thin (approximately 100 nm) fluoropolymer coating, as described elsewhere [2] . This technique operates under vacuum so that the material's entire surface is coated with a fluoropolymer.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The design of liquid repellent fabrics is extremely important to industrial and domestic applications that seek to minimise, or prevent liquid ingress from contaminating materials and personnel [1][2][3][4][5] . In order to render a textile liquid repellent a silicone or fluorocarbon coating is usually applied.…”

Section: Introductionmentioning

confidence: 99%

Quantitative NMR monitoring of liquid ingress into repellent heterogeneous layered fabrics

Bencsik¹,

Adriaensen²,

Brewer³

et al. 2008

Journal of Magnetic Resonance

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Fabrics which are water repellent and repellent to other liquids are often constructed using multiple layers of material. Such a construction is preferable to a single layer of a liquid repellent textile because, under the action of an applied pressure, ingress of a liquid through the first layer can be halted by the second or subsequent layers. In the quantitative investigation of this problem, current techniques provide limited information on the progress and distribution of the liquid as it ingresses into a fabric. Moreover, many techniques require that the material is delaminated prior to analysis, and cannot be conducted in real time to measure the progress of a liquid through the textile substrate. In this work we demonstrate that unilateral NMR, which allows signal to be collected from a volume of interest in a material residing above the instrument, can be a powerful tool to quantitatively monitor the ingress of a liquid through a layered sample exhibiting pronounced heterogeneities in repellency. A known volume of oil was placed on the top of a model textile sample composed of three 80 µm thick layers. Spatially resolved one dimensional vertical NMR profiles of the system were acquired as a function of the pressure vertically applied to the top of the sample. These profiles show that the absolute liquid volume present in each layer of textile can routinely be measured within 4 minutes with a spatial resolution of 15 µm. If each individual layer exhibits different repellency to the test liquid, the complexity of the dynamics of the ingress can be investigated in great detail. An elegant application of the unilateral instrument was obtained in which the sensitive volume matched the region of interest of the individual layers of the textile under investigation.

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Super-Repellent Composite Fluoropolymer Surfaces

Abstract: Deposition of low surface energy plasma polymer layers onto microroughened PTFE substrates is found to give rise to high repellency toward polar and nonpolar probe liquids. This behavior has been interpreted in terms of Wenzels theory and the Cassie-Baxter relationship.

Cited by 274 publications

References 51 publications

Superoleophobic surfaces: design criteria and recent studies

Superoleophobic surfaces: design criteria and recent studies

Superhydrophobic properties of ultrathin rf-sputtered Teflon films coated etched aluminum surfaces

Quantitative NMR monitoring of liquid ingress into repellent heterogeneous layered fabrics

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