Contact Angles and Coating Film Thickness

Tavana, Hossein; Petong, N.; Hennig, A.; Grundke, Karina; Neumann, A. W.

doi:10.1080/00218460590904435

Cited by 43 publications

(28 citation statements)

References 22 publications

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“…The contact angle observed for pure Teflon AF1600 is comparable with literature and highlights the superhydrophobic surface of the perfluoropolymer [23]. The composite membranes all have comparable water contact angles to that of the pure Teflon AF1600 layer, demonstrating that the superhydrophobic layer covers the composite structure surface.…”

Section: Hydrophobicity Of the Composite Membranessupporting

confidence: 71%

Water Resistant Composite Membranes for Carbon Dioxide Separation from Methane

Scholes

2018

Applied Sciences

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Abstract:Membranes that are resistant to water vapor permeation have potential in natural gas sweetening by reducing the need for pretreatment. The perfluorinated polymer Teflon AF1600 has proven resistance to water vapor, which is adapted here in the form of composite membranes consisting of a Teflon AF1600 protective layer on membranes of the polyimide 4,4 -(hexafluoroisopropylidene) diphthalic anhydride 2,3,5,6-tetramethyl-1,4-phenylenediamine (6FDA-TMPDA) as well as Polymer of Intrinsic Micro-porosity (PIM-1). The permeability of CO 2 and CH 4 through the composite membranes was shown to be a function of the respective permeabilities of the individual polymer layers, with the Teflon AF1600 layer providing the majority of the resistance to mass transfer. Upon exposure to water, the composite membranes had reduced water permeation of 7-13% compared to pure membranes of 6FDA-TMPDA and PIM-1, because of the water resistance of the Teflon AF1600 layer. It was observed that water permeated as clusters through the composite structure. Under CO 2 -CH 4 mixed gas conditions, 6FDA-TMPDA layer permselectivity performance was reduced and became comparable to Teflon AF1600, while the PIM-1 layer retained much of its high permselectivity performance. Importantly, at water activities below 0.2 the PIM-1 composite membrane achieved higher permeability for CO 2 compared to water.

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Section: Hydrophobicity Of the Composite Membranessupporting

confidence: 71%

Water Resistant Composite Membranes for Carbon Dioxide Separation from Methane

Scholes

2018

Applied Sciences

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“…This result indicates that the forces associated with the interaction of water with the surface are greater than the cohesive forces associated with bulk liquid water (Arkles 2011). The solid surface should be rigid, smooth, and homogeneous for the determination of the contact angle with that particular solid (Tavana et al 2005).…”

Section: Hydrophilicity Of Bio-nanocomposite Filmsmentioning

confidence: 99%

Oil Palm Shell Nanofiller in Seaweed-based Composite Film: Mechanical, Physical, and Morphological Properties

et al. 2017

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Composite films that utilize seaweed as a matrix and oil palm shell (OPS) nanoparticles as a reinforcing material were developed. The effects of loading OPS nanoparticle (0%, 1%, 5%, 10%, 20%, and 30%) into seaweed films were determined by analyzing the physical, mechanical, and morphological properties of the films. The seaweedbased film incorporated with OPS nanoparticles at a high concentration (20% w/w) achieved the highest tensile strength (44.8 MPa) and Young's Modulus (3.13 GPa). However, the film's hydrophobicity (contact angle = 47.3º) and percentage of elongation at break (2.10%) were reduced. Moreover, it was observed that excessive loading of nanofillers (> 20%) reduced the tensile strength and hydrophilicity of the film. This phenomenon was attributed to the agglomeration of OPS nanoparticles and the formation of large voids on the film surface. Thus, the relative effectiveness of the various tested nanofiller contents in enhancing the mechanical strength of the composite film were found to be ranked in the following order: 20%, 10%, 5%, 30%, and 1%.

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“…This fluoropolymer is intrinsically hydrophobic due to its low surface energy of about B13.6 Â 10 À3 J m À2 . 33 In sum, we produced polymer skin replicas of similar chemical bulk composition, but with distinctive surface Figure 1 Skin pattern of T. bielanensis (European giant springtail). The inserts represents SEM images of the several skin features of the hierarchically structured skin.…”

Section: Resultsmentioning

confidence: 99%

Tunable nano-replication to explore the omniphobic characteristics of springtail skin

et al. 2013

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Springtails (Collembola) are wingless arthropods adapted to cutaneous respiration in temporarily rain-flooded and microbially contaminated habitats by a non-wetting and antiadhesive skin surface that is mechanically rather stable. Recapitulating the robust and effectively repellent surface characteristics of springtail skin in engineered materials may offer exciting opportunities for demanding applications, but it requires a detailed understanding of the underlying design principles. Towards this aim and based on our recent analysis of the structural features of springtail skin, we developed a tunable polymer replication process to dissect the contributions of different structural elements and surface chemistry to the omniphobic performance of the cuticle. The Cassie-Wenzel transition at elevated pressures was explored by in situ plastron collapse experiments and by numerical FEM simulations. The results obtained unravel the decisive role of nanoscopic cuticle structures for the protection of springtails against wetting, and explain how the evolved nanotopography enables the production of omniphobic surfaces even from intrinsically hydrophilic polymer materials.

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Contact Angles and Coating Film Thickness

Cited by 43 publications

References 22 publications

Water Resistant Composite Membranes for Carbon Dioxide Separation from Methane

Water Resistant Composite Membranes for Carbon Dioxide Separation from Methane

Oil Palm Shell Nanofiller in Seaweed-based Composite Film: Mechanical, Physical, and Morphological Properties

Tunable nano-replication to explore the omniphobic characteristics of springtail skin

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