Transparent hydrophobic and superhydrophobic coatings fabricated using polyamide 12–SiO<sub>2</sub> nanocomposite

Prasad, Gajula; Chakradhar, R.P.S.; Bera, Parthasarathi; Prabu, Arun Anand; Anandan, C.

doi:10.1002/sia.6175

Cited by 11 publications

(5 citation statements)

References 44 publications

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“…Advances in Polymer Technology agreement with previous studies [30][31][32][33]. From Figure 6, it is clear that PA shows a peak at a wave number of 3290 cm -1 , related to hydrogen-bonded N-H stretching.…”

Section: Chemical Analysis By Ftirsupporting

confidence: 90%

Studying the Fabrication and Characterization of Polymer Composites Reinforced with Waste Eggshell Powder

Alkaron

Hamad

Sabri

2023

Advances in Polymer Technology

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Polymeric and plastic materials currently have numerous positive impacts due to their unique properties that make them important for various engineering applications. However, sustainability is a vital factor that should be considered, because of environmental issues. Eggshells (ES) are an important way to reduce the impact of nondegradable materials when applied to reinforce different types of polymer matrices, whether natural or synthetic polymers. Therefore, this study is an attempt to explore the potential application of waste eggshell fillers for the first time as a natural reinforcement in polyamide 12 (PA) composites. PA was loaded with three different ratios (3, 5, and 10 wt. %) of eggshell powder. Morphological studies of the PA powder, ES powder, and their composites were carried out by scanning electron microscopy (SEM). Furthermore, differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy were performed to study the thermal and chemical properties of the raw materials and the produced composites. The results indicate ES fillers’ potential usage as a reinforcement material to develop the thermal and chemical properties of the PA polymer matrix composites, thereby reducing costs and minimizing the environmental pollution caused by waste eggshells and petroleum-based polymers.

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Section: Chemical Analysis By Ftirsupporting

confidence: 90%

Studying the Fabrication and Characterization of Polymer Composites Reinforced with Waste Eggshell Powder

Alkaron

Hamad

Sabri

2023

Advances in Polymer Technology

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“…The work of adhesion was calculated for the coatings hydrated at different temperatures using Young–Dupre’s equation where W SL is the work of adhesion between the solid and liquid surface and γ la is the interfacial tension of the liquid/air interface (72.99 mN/m). The work of adhesion values for 40 and 50 °C hydrophobic surfaces were found to be 55.91 and 30.01 mN/m, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7c−j shows the top surface and three-dimensional (3D) topographical image of the alumina film hydrated at different HWI temperatures.The work of adhesion was calculated for the coatings hydrated at different temperatures using Young−Dupre's equation62 …”

mentioning

confidence: 99%

Double-Sided, Omnidirectional γ-AlOOH Hierarchical Nanostructures: Imparting Enhanced Antireflective Properties with Self-Cleaning Capacity for Optical Devices

et al. 2021

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Herein, we have successfully developed an integrated strategy to develop antireflective coatings with self-cleaning capabilities based on periodic double-sided photonic γ-AlOOH nanostructures to transmit maximum incident light photons. Interfacial reflections are instinctive and one of the fundamental phenomena occurring at interfaces owing to refractive index mismatch. The eradication of such undesirable light reflection is of significant consideration in many optical devices. A systematic approach was carried out to eradicate surface reflection and enhance optical transmission by tailored γ-AlOOH nanostructures. The γ-AlOOH photonic nanostructures with subwavelength features exhibited a gradient index, which almost eliminated the refractive index mismatch at the interface. Optical transmittance of 97% was achieved in the range of 350–800 nm at normal incidence compared to uncoated glass (89%). A multilayer model approach was adopted to extract the effective refractive index of the coating, which showed a graded index from the top to the bottom surface. Further, to fully comprehend the optics of these nanostructures, the omnidirectional (20–70°) antireflective property has been explored using variable-angle specular reflectance spectroscopy. The hierarchical γ-AlOOH nanostructures exhibited only ∼1.3% reflectance at the lower incident angle in the visible spectra and an average reflectance of ∼7.6% up to an incident angle of 70°. Moreover, the hierarchical nanostructures manifested contact angle (CA) >172° and roll-off angle (RA) <1° with excellent self-cleaning performance. Furthermore, the abrasion resistance of the coating is discussed in detail, which displayed a good resistance against sand erosion. Significantly, the photovoltaic performance of the coated modules exhibited a relative enhancement of ∼17% in efficiency, which is attributed to the efficient coupling of light rays. Thus, the integration of the antireflection (AR) property with self-cleaning ability can provide a cost-effective energy solution for optoelectronic devices, display devices, and thin-film optics.

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“…The surfaces of Sample BS/SiO 2 are covered by a larger and higher coating, which reveals that the hydrophobic properties of silk fabrics are improved. 66 Consequently, according to pictures (c)-(f) in Table 2, the composite coatings project into the pores of the fibers, and this could increase the crease recovery and the flexural rigidity, as shown in Figure 7.…”

Section: Sem and Energy-dispersive X-ray Spectroscopy Analysis Of The Coated Fabricsmentioning

confidence: 99%

Fabrication of reinforced hydrophobic coatings for the protection of silk fabric

Zhao

Zhang

et al. 2019

Textile Research Journal

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The design of water-resistance and breathable materials applied to the protection of a historical silk textile has raised considerable interest for their highly practical potential. Thus, simple and functional composite coatings have been investigated and applied on Bombyx mori silk fabrics by spraying silk fibroin and a water soluble siloxane emulsion enriched with silica nanoparticles (12 nm). The layer of spraying silk fibroin on the surface of the silk fabric resulted in mesoscopic molecular network reconstruction by hydrogen bonds and crosslinking of ethylene glycol diglycidyl ether to improve the physical property of the silk fabric. By systematically investigating silica composite treatment, it was found that the sample treated with silica composite coatings possessed a good hydrophobic property, in which the static contact angles increased from 43.27° to 145.77° for uncoated and coated samples, respectively. As determined by Fourier transform-infrared spectroscopy analyses, hydrophobic components such as Si-O-Si, Si-O were successfully attached to the silk fabric. The scanning electron microscopy images and the energy-dispersive X-ray spectroscopy map point distribution images showed that the coating of the silica composite forms a uniform nano-scale structure, which improved the waterproof and breathable performance. Compared with uncoated fabric, the silica composite treatment was endowed with enhanced air permeability of 446.47 mm/s. After the abrasion and washing cycles, high durability of the coated fabric was demonstrated. Excellent hydrophobic capability could help silk fabric avoid the destruction of any harmful pollutant, such as light, bacteria, sewage and so on. Furthermore, the proposed relationship between the adhesive structure and the waterproof/breathable property is applicable in the design of functional silk textiles with different levels for protective performance.

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Transparent hydrophobic and superhydrophobic coatings fabricated using polyamide 12–SiO₂ nanocomposite

Cited by 11 publications

References 44 publications

Studying the Fabrication and Characterization of Polymer Composites Reinforced with Waste Eggshell Powder

Studying the Fabrication and Characterization of Polymer Composites Reinforced with Waste Eggshell Powder

Double-Sided, Omnidirectional γ-AlOOH Hierarchical Nanostructures: Imparting Enhanced Antireflective Properties with Self-Cleaning Capacity for Optical Devices

Fabrication of reinforced hydrophobic coatings for the protection of silk fabric

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Transparent hydrophobic and superhydrophobic coatings fabricated using polyamide 12–SiO2 nanocomposite

Cited by 11 publications

References 44 publications

Studying the Fabrication and Characterization of Polymer Composites Reinforced with Waste Eggshell Powder

Studying the Fabrication and Characterization of Polymer Composites Reinforced with Waste Eggshell Powder

Double-Sided, Omnidirectional γ-AlOOH Hierarchical Nanostructures: Imparting Enhanced Antireflective Properties with Self-Cleaning Capacity for Optical Devices

Fabrication of reinforced hydrophobic coatings for the protection of silk fabric

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Transparent hydrophobic and superhydrophobic coatings fabricated using polyamide 12–SiO₂ nanocomposite