Nanotexturing of poly(dimethylsiloxane) in plasmas for creating robust super-hydrophobic surfaces

Tserepi, Angeliki; Vlachopoulou, M. E.; Gogolides, Εvangelos

doi:10.1088/0957-4484/17/15/062

Cited by 194 publications

(163 citation statements)

References 37 publications

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“…One of the most challenging aspects of preparing non-wettable coatings is to maintain a good degree of transparency while retaining robust and scratch resistant self-cleaning and stain free characteristics [1][2][3]. Transparency and surface roughness are generally contradictory properties.…”

Section: Introductionmentioning

confidence: 99%

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Bayer

2017

Coatings

122

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Transparent liquid repellent coatings with exceptional wear and abrasion resistance are very demanding to fabricate. The most important reason for this is the fact that majority of the transparent liquid repellent coatings have so far been fabricated by nanoparticle assembly on surfaces in the form of films. These films or coatings demonstrate relatively poor substrate adhesion and rubbing induced wear resistance compared to polymer-based transparent hydrophobic coatings. However, recent advances reported in the literature indicate that considerable progress has now been made towards formulating and applying transparent, hydrophobic and even oleophobic coatings onto various substrates which can withstand certain degree of mechanical abrasion. This is considered to be very promising for anti-graffiti coatings or treatments since they require resistance to wear abrasion. Therefore, this review intends to highlight the state-of-the-art on materials and techniques that are used to fabricate wear resistant liquid repellent transparent coatings so that researchers can assess various aptitudes and limitations related to translating some of these technologies to large scale stain repellent outdoor applications.

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Section: Introductionmentioning

confidence: 99%

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Bayer

2017

Coatings

122

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“…These include the covalent grafting of appropriate molecules onto plasma activated surfaces or the durable adsorption of polyelectrolytes on charged surfaces (as obtained for example after ammonia plasma treatment) [5]. In addition to modification of surface chemical composition, plasma techniques have also been used to modify the surface morphology (roughening) of polymeric surfaces aiming for example at changes in wetting behaviour [6][7][8]. Poly(dimethylsiloxane) (PDMS) is a commercially available type of silicone rubber widely used in the fabrication of medical [9] and microfluidic devices [10], and as foul-release coating to control marine biofouling [11,12].…”

Section: Introductionmentioning

confidence: 99%

Fluorination of poly(dimethylsiloxane) surfaces by low pressure CF4 plasma – physicochemical and antifouling properties

Cordeiro¹,

Nitschke²,

Janke³

et al. 2009

Express Polym. Lett.

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Abstract. Fluorinated surface groups were introduced into poly(dimethylsiloxane) (PDMS) coatings by plasma treatment using a low pressure radio frequency discharge operated with tetrafluoromethane. Substrates were placed in a remote position downstream the discharge. Discharge power and treatment time were tuned to alter the chemical composition of the plasma treated PDMS surface. The physicochemical properties and stability of the fluorine containing PDMS were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and contact angle measurements. Smooth PDMS coatings with a fluorine content up to 47% were attainable. The CF4 plasma treatment generated a harder, non-brittle layer at the top-most surface of the PDMS. No changes of surface morphology were observed upon one week incubation in aqueous media. Surprisingly, the PDMS surface was more hydrophilic after the introduction of fluorine. This may be explained by an increased exposure of oxygen containing moieties towards the surface upon re-orientation of fluorinated groups towards the bulk, and/or be a consequence of oxidation effects associated with the plasma treatment. Experiments with strains of marine bacteria with different surface energies, Cobetia marina and Marinobacter hydrocarbonoclasticus, showed a significant decrease of bacteria attachment upon fluorination of the PDMS surface. Altogether, the CF4 plasma treatments successfully introduced fluorinated groups into the PDMS, being a robust and versatile surface modification technology that may find application where a minimization of bacterial adhesion is required.

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“…The alcohol medium was supplied by the Sigma Aldrich Company. The concentration of the treatment material is a crucial factor, since to obtain satisfactory results, the substrate must receive a suitable quantity of well-dispersed materials, in a sufficiently fluid form, and one of the important issues when choosing the concentration of the treatment material were the porosity and composition of stone material [26,27]. In addition, many other studies worked on the preservation of marble stone monuments, and recommended that-according to the stone nature and porosity and due to the very low porosity of marble stone-the proper concentration of treatment materials (2%) be appropriate, as the high content of nanoparticles led to aggregates of nanoparticles and low penetration inside the stone structure.…”

Section: Preparation Of Tio 2 Nanocoatingmentioning

confidence: 99%

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

et al. 2017

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Stone surfaces and façades of historic buildings, due to their predominately outdoor location, suffer from many deterioration factors, including air pollution, soluble salts, relative humidity (RH)/temperature, and biodeterioration, which are the main causes of decay. In particular, the façades of the buildings deteriorate with direct exposure to these factors; deformation and disfiguration of superficial decoration and formation of black crusts are often observed on the stones. The development and application of self-cleaning and protection treatments on historical and architectural stone surfaces could be a significant improvement in the conservation, protection and maintenance of Cultural Heritage. A titanium dioxide nanoparticle has become a promising photocatalytic material, owing to its ability to catalyze the complete degradation of many organic contaminants and environmental factors. In this study, TiO 2 nanoparticles, dispersed in an aqueous colloidal suspension, were applied directly to historic marble stone surfaces, by spray-coating, in order to obtain a nanometric film over the stone surface. The study started with an investigation of some properties of TiO 2 nanoparticles, to assess the feasibility of the use of TiO 2 on historic stone and architectural surfaces. Scanning electron microscopy (SEM) was, coupled with energy dispersive X-ray (EDX) microanalysis, (SEM-EDX), in order to obtain information on coating homogeneity and surface morphology, before and after artificial aging; the activity of the coated surface was evaluated through UV-light exposure, to evaluate photo-induced effects. The changes of molecular structure occurring in treated samples were spectroscopically studied by attenuated total reflection infrared spectroscopy (ATR-FTIR); activity of the hydrophobic property of the coated surface was evaluated by Sterio microscopy, model Zeiss 2010 from Munich, Germany, equipped with photo camera S23 under 80X magnification. The efficacy of the treatments was evaluated through capillary water absorption, and colorimetric measurements, performed to evaluate the optical appearance. Results showed that TiO 2 nanoparticles are good candidates for coating applications on historic stone surfaces, where self-cleaning photo-induced effects are well evident; they enhanced the durability of stone surfaces toward UV aging, improved resistance to relative humidity (RH)/temperature and abrasion affect, reduced accumulation of dirt on stone surfaces when left in open air for 6 months, and did not alter the original features.

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Nanotexturing of poly(dimethylsiloxane) in plasmas for creating robust super-hydrophobic surfaces

Cited by 194 publications

References 37 publications

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

On the Durability and Wear Resistance of Transparent Superhydrophobic Coatings

Fluorination of poly(dimethylsiloxane) surfaces by low pressure CF4 plasma – physicochemical and antifouling properties

Protecting of Marble Stone Facades of Historic Buildings Using Multifunctional TiO2 Nanocoatings

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