Sol-gel multilayered coatings for reduction of H2 permeation

Szczurek, Anna; Babiarczuk, Bartosz; Kubacki, Jerzy; Papin, Philippe; Renault, P.-O.; Żak, Andrzej; Kaleta, Jerzy; Krzak, Justyna

doi:10.1016/j.apsusc.2019.143691

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…The XPS spectra allow further analysis of the elemental type and the molecular structure of the sample. Figure S5 shows the full elemental spectrum of the SiO 2 @CNT filler, from which it can be found that the SiO 2 @CNT filler contains four major elements, namely C, O, Si, and N. In Figure 1D, the C 1s spectra of SiO 2 @MNCNT is divided into five peaks, where the binding energy of 283.7, 284.4, 286.0, 287.0, and 290.1 eV represent the carbon atoms from CC, CN, CO, OCO groups and carbon atoms in π–π* interactions respectively 21 . The results of different C configurations remain in basic agreement with those analyzed from FT‐IR spectra.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Ma,

Wang,

Yang

et al. 2024

Polymer Composites

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The inherent balance between dielectric constant and loss restricts the actual usage of dielectric elastomer actuators with high actuation strains, proposing a method that can break this trade‐off has been an urgent query. In this work, silica‐loaded carbon nanotubes (called SiO2@CNT) were prepared as dopants for acrylic resin elastomers (abbreviated as ARE) using the sol–gel method, and the obtained SiO2@CNT/ARE composites reached a dielectric constant of 282.5 at 100 Hz at a filler content of 3.22 vol%, which is 86 times higher than that of the pure ARE, whereas the dielectric loss remains at 0.17. The equilibrium between dielectric constant and loss is broken mainly based on the loading of SiO2 which inhibits the formation of carbon nanotube conductive network and concurrently reinforces the compatibility of the filler with ARE. Such a design offers a generalizable strategy for the subsequent preparation of polymer‐based composite films with excellent dielectric properties.Highlights Preparation of fillers with excellent dispersibility in the organic phase. The ARE‐based composites exhibit excellent dielectric properties at 100 Hz. The mechanism of increase in dielectric constant is explained using two models.

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Section: Resultsmentioning

confidence: 99%

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Ma,

Wang,

Yang

et al. 2024

Polymer Composites

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“…The (CF)0 and (CF)6 samples showed roughness parameters below 1 nm that were lower than for the PET foil (Table 2). Such a parameter is typical for sol-gel-derived silica coatings and is similar to polyfluoroalkyl-silica porous coatings on glass substrates with antireflec-tion properties [54,59,60]. The smooth surfaces of these materials could be particularly interesting in the application as covering and packaging materials.…”

Section: Discussionmentioning

confidence: 96%

Structural and Functional Properties of Fluorinated Silica Hybrid Barrier Layers on Flexible Polymeric Foil

et al. 2021

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The reported work was focused on sol–gel-derived organically modified and fluorinated silica coatings deposited on elastic polymeric foil. The structure and topography of the coatings were tested by infrared spectroscopy and microscopic studies. The functional properties were determined using thermal analysis, surface analysis, and oxygen permeability tests. The barrier feature of the investigated materials against oxygen was correlated with the properties of the coatings. The hybrid (organic–inorganic) structure of the coatings was proven, demonstrating the presence of a silica network modified with alkyl and fluoroalkyl groups since precursors with the isooctyl group or different lengths of the fluoroalkyl chains were used for the syntheses. The coatings were free of defects and had a smooth surface except for the sample containing the longest fluoroalkyl chain (perfluorododecyl group), which showed a wrinkle-like surface. The hydrophobic character of the coatings increased, whereas the oxygen permeation coefficient values decreased (reaching a fourfold lower coefficient in comparison to the bare substrate) with a higher content of the fluorinated carbon atoms in the structure. The results were enriched by the information from the thermomechanical analysis as well as nanoindentation and scratch tests giving values of the glass transition temperature, thermal expansion coefficient, coatings adhesion, and hardness of the investigated systems.

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“…The smallest hydrogen permeability, thanks to the use of high-density materials and additional sealing with, e.g., sol-gel type of materials [1];…”

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confidence: 99%

“…Limiting hydrogen permeability (e.g., by the use of barrier layers made using solgel technology, e.g., [1,[25][26][27]), or the use of constructions limiting the amount of hydrogen accumulated between a liner and composite (reduction of the so-called air gaps, or also the use of ventilation structures inside composites to allow natural hydrogen escape); • Liner resistance to high temperature, e.g., when a fire occurs near a high-pressure hydrogen storage container [28,29]. An additional goal is the so-called controlled defect, which allows for heat transfer through a composite shell and leads to liner melting [9,28].…”

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confidence: 99%

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

et al. 2021

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A polyethylene (PE) liner is the basic element in high-pressure type 4 composite vessels designed for hydrogen or compressed natural gas (CNG) storage systems. Liner defects may result in the elimination of the whole vessel from use, which is very expensive, both at the manufacturing and exploitation stage. The goal is, therefore, the development of efficient non-destructive testing (NDT) methods to test a liner immediately after its manufacturing, before applying a composite reinforcement. It should be noted that the current regulations, codes and standards (RC&S) do not specify liner testing methods after manufacturing. It was considered especially important to find a way of locating and assessing the size of air bubbles and inclusions, and the field of deformations in liner walls. It was also expected that these methods would be easily applicable to mass-produced liners. The paper proposes the use of three optical methods, namely, visual inspection, digital image correlation (DIC), and optical fiber sensing based on Bragg gratings (FBG). Deformation measurements are validated with finite element analysis (FEA). The tested object was a prototype of a hydrogen liner for high-pressure storage (700 bar). The mentioned optical methods were used to identify defects and measure deformations.

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Sol-gel multilayered coatings for reduction of H2 permeation

Cited by 10 publications

References 35 publications

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Structural and Functional Properties of Fluorinated Silica Hybrid Barrier Layers on Flexible Polymeric Foil

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

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Sol-gel multilayered coatings for reduction of H2 permeation

Cited by 10 publications

References 35 publications

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO2 loaded carbon nanotubes

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO2 loaded carbon nanotubes

Structural and Functional Properties of Fluorinated Silica Hybrid Barrier Layers on Flexible Polymeric Foil

Validation of Selected Optical Methods for Assessing Polyethylene (PE) Liners Used in High Pressure Vessels for Hydrogen Storage

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Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes