Superhydrophobic and conductive carbon nanofiber/PTFE composite coatings for EMI shielding

Das, Arindam; Hayvacı, Harun Taha; Tiwari, Manish K.; Bayer, Ilker S.; Erricolo, Danilo; Megaridis, Constantine M.

doi:10.1016/j.jcis.2010.09.017

Cited by 122 publications

(68 citation statements)

References 20 publications

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“…The binder in this case was a mixture of polyvinylidene fluoride (PVDF) and polymethylmethacrylate (PMMA), a useful compromise to impart adhesion, hydrophobicity and wear and chemical resistance. 23 Another common method is to take an existing rough surface, such as that of concrete, and treating it with a thin hydrophobising agent. These are typically surface adherent molecules such as silanes, but fluorocarbon block copolymers are also common with the other block attaching to the substrate.…”

Section: Paint Technologymentioning

confidence: 99%

The superhydrophobicity of polymer surfaces: Recent developments

Shirtcliffe

McHale

Newton

2011

J Polym Sci B Polym Phys

168

108

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Superhydrophobicity is the extreme water repellence of highly textured surfaces. The field of superhydrophobicity research has reached a stage where huge numbers of candidate treatments have been proposed and jumps have been made in theoretically describing them. There now seems to be a move to more practical concerns and to considering the demands of individual applications instead of more general cases. With these developments, polymeric surfaces with their huge variety of properties have come to the fore and are fast becoming the material of choice for designing, developing, and producing superhydrophobic surfaces.

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Section: Paint Technologymentioning

confidence: 99%

The superhydrophobicity of polymer surfaces: Recent developments

Shirtcliffe

McHale

Newton

2011

J Polym Sci B Polym Phys

168

108

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“…Coating is a crucial step in adjusting the surface properties of the materials including polymers. In this sense, alternative methods to prepare superhydrophobic surfaces on commodities polymers have been recently reported [24][25][26][27][28][29][30]. Many polymers present hydrophobic surface properties; however, they are not superhydrophobic and, in contrast to hard materials, such as metals or ceramics, after surface modification they suffer from hydrophobic recovery by regaining their original wettability.…”

Section: Introductionmentioning

confidence: 99%

Permanent superhydrophobic polypropylene nanocomposite coatings by a simple one-step dipping process

Contreras

Chagas

Strumia

et al. 2014

Applied Surface Science

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a b s t r a c tSuperhydrophobic nanocomposite coatings on injection-molded polypropylene (PP) samples were prepared by dipping in xylene solvent containing titanium dioxide nanoparticles (NPs) functionalized with trimethoxypropyl silane. Alternatively, PP samples were dipped in a mixture of functionalized NPs and dissolved PP pellets. As a general result, dip-coated PP samples reached a permanent superhydrophobic state with a contact angle hysteresis (CAH) depending on NPs concentration and surface chemistry. SEM and profilometer measurements show a general trend in the decrease of CAH with the increase of aggregates and roughness. However some results showed that surfaces with the same roughness presented different CAHs. XPS measurements showed that low CAHs and self-cleaning properties were obtained only when the Ti-OH relative concentration on the surface was about 20%. At higher Ti-OH relative concentrations, the surface kept a superhydrophobic static state but lost its self-cleaning properties. This work highlights the fact that both control of the roughness together with chemical surface composition of polar groups have to be taken into account for a precise tuning on the superhydrophobic dynamic component of the surface.

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“…In [9], a 1 mm-thick film of carbon nanofibers and carbon nanotubes dispersed in a polystyrene matrix was fabricated and characterized. Similarly, in [10] a spray coating was produced using a polymer blend of polyvinyldene fluoride and acrylic polymethyl methacrylate as matrix, filled with submicron polytetrafluoroethylene particles and vapor grown carbon nanofibers. A SE of about 25 dB in the Ku band for a thickness around 100 m was obtained.…”

Section: Introductionmentioning

confidence: 99%

Graphene-based EMI shield obtained via spray deposition technique

Acquarelli

Rinaldi

Bellis

et al. 2014

2014 International Symposium on Electromagnetic Compatibility

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In this work we investigate the shielding properties of graphene-based films, produced by spray casting deposition, which is a cost-effective technique that can be directly scaled to industrial applications. The deposition process is optimized in order to produce uniform films made of well dispersed graphene nanoplatelets (GNP), having thicknesses in the range 3-8 microns. The sheet resistance and the shielding effectiveness up to 18 GHz of films produced using GNP-suspensions at different concentrations are measured and compared with the ones of carbon nanotube (CNT)-based films, produced in the same conditions. The obtained results demonstrate the superior shielding properties of graphene-based films with respect to CNT-ones, mainly due to the bi-dimensional shape of GNPs, which contributes to minimizing the contact resistances among adjacent nanostructures. It is also demonstrated that after a thermal annealing at 250°C, the final measured shielding effectiveness of the produced GNP-film triplicates in linear scale, reaching the value of 30.6 dB

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Superhydrophobic and conductive carbon nanofiber/PTFE composite coatings for EMI shielding

Cited by 122 publications

References 20 publications

The superhydrophobicity of polymer surfaces: Recent developments

The superhydrophobicity of polymer surfaces: Recent developments

Permanent superhydrophobic polypropylene nanocomposite coatings by a simple one-step dipping process

Graphene-based EMI shield obtained via spray deposition technique

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