Hydrophilic/Hydrophobic Properties of Silica Surfaces Modified with Metal Oxides and Polydimethylsiloxane

Dyachenko, A. G.; Borysenko, M.V.; Pakhovchyshyn, S.

doi:10.1260/0263617042879546

Cited by 11 publications

(9 citation statements)

References 6 publications

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“…Similarly, other researchers also investigated the hydrophobic properties of PDMS with silica and PDMS with silica and metal oxides (Al 2 O 3 , Cr 2 O 3 , etc.) [58]. The addition of metal oxide was reported to impart a catalytic function to the reaction between the SiO 2 particles and polymer.…”

Section: Polysiloxane Based Viscoelastic Coatingsmentioning

confidence: 99%

A survey of icephobic coatings and their potential use in a hybrid coating/active ice protection system for aerospace applications

Huang

Tepylo

Pommier-Budinger

et al. 2019

Progress in Aerospace Sciences

184

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Icephobic coatings for aircraft and other surfaces subjected to ice accretion have generated great interest in the past two decades, due to the advancement of nanomaterials, coating fabrication methods, biomimetics, and a more in-depth understanding of ice nucleation and ice adhesion. Icephobic coatings have demonstrated the ability to repel water droplets, delay ice nucleation and significantly reduce ice adhesion. Despite these ongoing research activities and promising results, the findings reported hereafter suggest that coatings alone cannot be used for aircraft anti-icing and de-icing operations; rather, they should be considered as a complementary option to either thermal or mechanical ice protection methods, for reducing power consumption and the ecological footprint of these active systems and for expediting ground de-icing operations. This paper will first review the state-of-the-art of icephobic coatings for various applications, including their performance and existing deficiencies. The second part of this paper focuses on aerospace anti-icing and de-icing requirements and the need for hybrid systems to provide a complete ice protection solution. Lastly, several urgent issues facing further development in the field are discussed.

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Section: Polysiloxane Based Viscoelastic Coatingsmentioning

confidence: 99%

A survey of icephobic coatings and their potential use in a hybrid coating/active ice protection system for aerospace applications

Huang

Tepylo

Pommier-Budinger

et al. 2019

Progress in Aerospace Sciences

184

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“…Extensive commercial utilization of polydimethylsiloxane (PDMS) polymer has been driving intense investigations of its composites upgraded with nanosized inorganic fillers. The introduction of small amounts of transition and/or rare‐earth metal nano‐oxides is known to induce significant improvements in the specific properties of the polymer, such as its thermal stability, conductivity, texture, hydrophobicity, interfacial behavior, and so on . PDMS/silica is an example of such a hybrid nanocomposite material that is already manufactured and applied at a multi‐tonnage scale.…”

Section: Introductionmentioning

confidence: 99%

Dimethylsilanone Generation from Pyrolysis of Polysiloxanes Filled with Nanosized Silica and Ceria/Silica

et al. 2016

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Temperature‐programmed desorption mass spectrometry (TPD MS) was used to study the pyrolysis of PDMS and its composites with nanosized silica and ceria/silica. The results suggest that the elusive organosilicon compound, dimethylsilanone, is generated from PDMS over a broad temperature range (in some cases starting at 70 °C). The presence of nano‐oxides catalyzes this process. Ions characteristic of the fragmentation of dimethylsilanone under electron ionization are assigned with the aid of DFT structure calculations. Possible reaction mechanisms for dimethylsilanone generation are discussed in the context of the calculated kinetic parameters. Observed accompanying products of PDMS pyrolysis, such as tetramethylcyclodisiloxane and hexamethylcyclotrisiloxane, indicate that multiple channels are involved in the dimethylsilanone release.

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“…Increased interest in studies on highly dispersed hydrophobic materials is observed due to their wide application for creation of self-cleaning hydrophobic coatings (Gaoa and Hea 2013), chemical separation of polar and non-polar substances, adsorption of organic contaminants, removal of oil from the water surface (Franco et al 2014) as well as their use as thickeners and fillers for non-polar media (Macia-Agullo et al 1995). Hydrophobic materials for these applications also must have high specific surface areas, controlled characteristics of surface hydrophobicity, high thickening efficiency and the ability to disperse in the liquid media.…”

Section: Introductionmentioning

confidence: 99%

“…To evaluate surface hydrophobicity, several methods are used; however, they all have their own advantages and limitations. The most common is a method of measuring the wetting contact angle with water Θ (Dyachenko et al 2004;Somasundaran 2006;Tarasevich et al 2002). Usually materials are considered hydrophobic if their Θ exceeds 90 degrees.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, when determining the hydrophobicity of powder materials, the morphology of the material will have a major influence, as this affects the measuring contact angle. For this reason, the optimal method for evaluating the hydrophobicity of powder materials is the calorimetric technique of determining the heat of immersion (Dyachenko et al 2004;Somasundaran 2006). The method of measuring heat of immersion allows to evaluate the activity of the interaction of surface of powdered materials with different wetting liquids, which usually are water and some non-polar liquids (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas

Goncharuk

Sulym

Terpiłowski

et al. 2015

Adsorption Science & Technology

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ABSTRACT:Composites based on fumed silica with surface hydrophobic groups were synthesized by chemical substitution of silanol groups' proton for trimethylsilyl (TMS) groups, adsorption of poly(dimethylsiloxane) (PDMS) and combined chemical-adsorption methods. Microcalorimetry measurements and values of the wetting contact angle with water (Θ) were obtained to investigate the hydrophobic properties of prepared materials. The hydrophilicity indexes (K h ) were determined from the relationship of heat of immersion in water Q w to non-polar decane Q d . The Θ and Q w demonstrated changes with increase of modification degree (d m ) for composites containing a monolayer of PDMS. All samples with excess of PDMS had high Θ (>110°) and relatively low Q w and K h .Composites modified with TMS groups demonstrated hydrophobic properties in accordance with K h at d m 0.7, whereas Θ > 90° is observed only for those samples with d m = 1.0. The different methods of synthesis may be applied based on the morphological characteristics and hydrophobicity of the samples.

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Hydrophilic/Hydrophobic Properties of Silica Surfaces Modified with Metal Oxides and Polydimethylsiloxane

Cited by 11 publications

References 6 publications

A survey of icephobic coatings and their potential use in a hybrid coating/active ice protection system for aerospace applications

A survey of icephobic coatings and their potential use in a hybrid coating/active ice protection system for aerospace applications

Dimethylsilanone Generation from Pyrolysis of Polysiloxanes Filled with Nanosized Silica and Ceria/Silica

Effect of the Synthesis Methods on Hydrophobic Properties of Modified Silicas

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