Coalescence-Induced Droplet Jumping on Superhydrophobic Surfaces with Annular Wedge-Shaped Micropillar Arrays

Hou, Huimin; Wu, Xiaomin; Hu, Zhifeng; Gao, Sihang; Yuan, Zhiping

doi:10.1021/acs.langmuir.3c02534

Cited by 3 publications

(1 citation statement)

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“…Lotus leaves have a water-repellent surface with self-cleaning features, and this natural phenomenon inspired researchers to create water-repellent surfaces (showing a water contact angle (WCA) greater than 150° and sliding angle (SA) of less than 10°). , Superhydrophobic substrates have many advantages, including low surface energy and high surface roughness. − These surfaces are currently used for many applications such as electronics, self-cleaning, anti-icing, antistaining, oil–water separation, photocatalytic degradation, UV block, and antibacterial. − Several researchers have modified soft substrates such as cotton fabric to obtain superhydrophobic surface. − Cotton fabric is chosen due to some distinguishing features like softness, lightness, heat retention ability, and easy biodegradability and, most importantly, for medical applications. Among all fabric types, cotton’s market share is 48% worldwide.…”

Section: Introductionmentioning

confidence: 99%

Silica-Based Superhydrophobic and Superoleophilic Cotton Fabric with Enhanced Self-Cleaning Properties for Oil–Water Separation and Methylene Blue Degradation

Ahmad,

Rasheed

et al. 2024

Langmuir

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Superhydrophobic textiles with multifunctional characteristics are highly desired and have attracted tremendous research attention. This research employs a simple dip-coating method to obtain a fluorine-free silica-based superhydrophobic and superoleophilic cotton fabric. Pristine cotton fabric is coated with SiO2 nanoparticles and octadecylamine. SiO2 nanoparticles are anchored on the cotton fabric to increase surface roughness, and octadecyl amine lowers the surface energy, turning the hydrophilic cotton fabric into superhydrophobic. The designed cotton fabric exhibits a water contact angle of 159° and a sliding angle of 7°. The prepared cotton fabric is characterized by attenuated total reflectance-fourier transform infrared spectroscopy, X-ray diffraction, atomic force microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. In addition, the coated fabric reveals excellent features, including mechanical and chemical stability, superhydrophobicity, superoleophilicity, and the self-cleaning ability. SiO2 nanoparticles and octadecylamine-coated cotton fabric demonstrate exceptional oil–water separation and wastewater remediation performance by degrading the methylene blue solution up to 89% under visible light. The oil–water separation ability is tested against five different oils with more than 90% separation efficiency. This strategy has the advantages of low-cost precursors, a simple and scalable coating method, enhanced superhydrophobicity and superoleophilicity, self-cleaning ability, efficient oil–water separation, and exceptional wastewater remediation performance.

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