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Facile spraying fabrication of highly flexible and mechanically robust superhydrophobic F-SiO <sub/>2</sub> @PDMS coatings for self-cleaning and drag-reduction applications
摘要： Superhydrophobic coatings treated as surface functional materials are endowed with great application potential with respect to self-cleaning, drag-reduction, anti-icing, etc. In this study, we fabricated a highly flexible and mechanically robust superhydrophobic F-SiO2@PDMS coating through a facile layer-by-layer strategy. It was demonstrated that PDMS played a crucial role of binder for immobilizing the F-SiO2 nanoparticles and improving their adhesion to substrate materials. Meanwhile, the PDMS layer endowed the superhydrophobic coating with superior mechanical flexibility. Finally, the as-constructed superhydrophobic coating exhibited excellent water-repellency with a high water contact angle of 156.5° and low sliding angle of only 2.0°. Furthermore, the water adhesion strength on the superhydrophobic coating was only 2 mN, indicating its ultralow viscous resistance to dynamic moving water droplets. The superhydrophobic F-SiO2@PDMS coating was independent of the substrates without any limitations, and they exhibited high flexibility and mechanical robustness with the elongation ratio reaching 83.3% under the conditions of high superhydrophobicity. Also, the superhydrophobic coating exhibited strong durability under the severe environments of corrosion and mechanical abrasion. Thus, the as-fabricated highly flexible and mechanically robust superhydrophobic F-SiO2@PDMS coating is considered to be an ideal candidate for applications in the fields of self-cleaning and drag-reduction.
关键词： F-SiO2@PDMS,drag-reduction,mechanical robustness,superhydrophobic coatings,self-cleaning
更新于2025-09-04 15:30:14
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Biomimetic anti-reflective triboelectric nanogenerator for concurrent harvesting of solar and raindrop energies
摘要： As a combination of solar cell and water-based triboelectric nanogenerator (TENG), new concept of a solar-cell-based hybrid energy harvester has been proposed. However, previous studies have not fully considered the degradation of optical characteristics due to water-based TENG and energy loss due to an ineffective electrical connection between solar cell and water-based TENG. The 1% degradation in light transmittance by applying the water-based TENG on its outermost part results in more than 1 mW/cm2 output power loss in a solar cell, which cannot be recovered by the instantaneous electrical energy output of water-based TENG. Herein, we report a moth’s eye mimicking TENG (MM-TENG), which can play a role of complementary energy harvester to a conventional solar cell due to its superior specular transmittance (maximum of 91% for visible light). For the first time, we deeply analyze the optical effect of the MM-TENG on a solar cell by investigating solar-weighted transmittance (SWT). The 0.01% improved SWT in the MM-TENG increases the fill factor and power conversion efficiency of solar cell by 0.5% and 0.17%, respectively, compared with a conventional protective glass plate which is always applied in a solar panel. In addition to such prominent high transmittance, the self-cleaning property of the MM-TENG enables the long-term performance of the solar panel. And particularly, this paper reports a novel electric circuit for effective management in a hybrid energy harvester by intermittently transferring the stabilized electrical energy output of the MM-TENG. This work, which addresses issues for the practical utilization of the water-based TENG as a complementary energy harvester to solar cell, would move the water-based TENG one step closer to its practical utilization by resolving critical concerns.
关键词： hybrid energy harvester,property,waterbased,self-cleaning,moth's eye mimicking structure,switching circuit,triboelectric nanogenerator
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Study of self cleaning fabric modified by Cu doped TiO2 with the addition of tetraethyl orthosilicate (TEOS)
摘要： Study of self – cleaning fabric modified by Cu doped TiO2 with the addition of TEOS has been done to achieve high performance of self – cleaning fabric. TiO2 doped Cu were made by using Photo Assisted Deposition (PAD) method. After that, certain compositions of the water, TEOS and Cu – TiO2 catalyst with the TEOS variated are prepared to be padded by the fabric and then dryed in the oven at certain temperature. The addition of TEOS in fabric coating is to improved the catalyst performance in self – cleaning ability and photodegradation of methylen blue. After the fabric is made, then analyzed it by using FTIR. The photodegradation is tested by puting a small amount of fabric to a methylen blue solution for 2 hours to see its absorbance using UV – Vis Spectroscopy and the self – cleaning ability test is to put the fabric in a sludge dirt for several minutes then spray it with water. FTIR result showed that the addition of TEOS cause Ti – O – Si bond to be applied in the fabric. The fabric coated with doped TiO2 has better performance than the undoped on both MB photodegradation and self – cleaning ability. The MB photodegradation performance of fabric increased with the amount of TEOS up to 74.4% within 2 hours and the efficiency of sludge dirt self – cleaning of fabric increased with the amount of fabric up to 83% efficiency, which is the type of fabric cotton Cu – TiO2 1,2% Si was the best among the other type of fabrics.
关键词： photodegradation,TEOS,methylene blue,self-cleaning fabric,Cu doped TiO2
更新于2025-09-04 15:30:14
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Biomimetic Hierarchical TiO <sub/>2</sub> @CuO Nanowire Arrays-Coated Copper Meshes with Superwetting and Self-Cleaning Properties for Efficient Oil/Water Separation
摘要： Creating a practical and energy-efficient method with high efficiency to separate oil–water mixtures and emulsions is essential for sustainable aquatic ecosystem and waste oil recycling. Herein, we reported a completely inorganic hierarchical TiO2@CuO nanowire array-coated copper mesh membrane fabricated using chemical oxidation and hydrothermal recrystallization. The biomimetic hierarchical nano-/micro-structure can form a lotus-leaf-like interface with fine surface roughness and hydration ability, thus endows the membrane superhydrophilic and underwater superoleophobic nature. Thus, the as-synthesized TiO2@CuO nanowire array-coated copper mesh membrane demonstrated promising water flux of 87.6 kL·h-1·m-2 and ultrahigh separation efficiency with oil residue of only 12.4 mg·L-1 in the permeate. Moreover, the uniformly immobilized TiO2 nanoparticles exhibit UV-irradiated photocatalytic ability, which can be effectively regenerate the contaminated membrane after exposure to UV irradiations for 60 min. Therefore, this high efficiency, reusable, and easy-scalable membrane fabrication strategy may possess practical potential for next-generation oil/water separation application.
关键词： Biomimetic morphology,self-cleaning,nano-/micro- hierarchical structure,oil/water separation
更新于2025-09-04 15:30:14