Dynamic hydrophobic behavior of water droplets impact on the cotton fabrics coated with POSS block copolymer

Kong, Que; Zhang, Zuoliang; Li, Chi Kong; Ren, Xiaofeng

doi:10.1007/s10570-019-02870-7

Cited by 5 publications

(6 citation statements)

References 37 publications

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“…In addition, the capillary pressure developing within the trapped air promotes the droplet rebound. 54 In the case of the plain jersey stitch pattern, the wale direction has a larger surface roughness than the course direction in terms of micro-roughness. Therefore, it is considered that the wale direction which contained more trapped air was more favorable for rebounding behavior.…”

Section: Resultsmentioning

confidence: 99%

“…53,54 Effectively, the state of the water droplet varies according to the liquid–solid interaction and is influenced by the roughness and surface energy of substrates which could affect the adhesive property of the surface. 54…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the water droplet impact behavior test is a comprehensive method to characterize surface wetting. 53 In particular, the impact dynamics of droplets on surfaces play an important role in the self-cleaning properties of superhydrophobic fabrics. The droplet can exhibit sticking, splashing, spreading, bouncing, or pinning behavior depending on the impact viscosity, surface tension, density, and radius of the droplet, and surface properties.…”

Section: Dynamic Behavior Of Water Droplets On Superhydrophobic Knitt...mentioning

confidence: 99%

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Study of superhydrophobicity according to surface structure of knitted fabrics

Lee

2022

Textile Research Journal

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This study seeks to analyze the effect of geometric structures of weft-knitted fabrics on superhydrophobicity and the dynamic behavior of water droplets. A flat knitting machine with different stitch patterns was used to prepare 100% polyester knitted fabrics. For the superhydrophobic surface, nano-roughness through alkaline treatment and a hydrophobic coating were introduced on prepared knitted fabrics. To analyze micro-roughness, pore size, cover factor, surface roughness, and air permeability were measured. Surface wettability was evaluated by contact and shedding angle measurements, and the dynamic behavior of droplets. Micro-roughness was greater in the order of tuck, purl, and plain jersey stitch patterns with a small cover factor and large pore size. In addition, tuck and purl stitches showed differences in surface roughness according to the wale and course directions. Nano-roughness was discernible as the alkaline treatment time increased. Following an evaluation of the wettability, the purl stitches exhibited a contact angle of 150° or more with only the hydrophobic coating. After imparting nano-roughness by alkaline treatment, the contact angle was more than 150° in all the samples. In the case of shedding angle, the tuck and purl stitches showed differences according to the course and wale directions. The shedding angle was lower when the roughness was high and the ridge and the droplet sliding directions were parallel. This difference decreased as the nano-roughness increased according to the alkaline treatment time. An evaluation of the dynamic behavior of water droplets on the superhydrophobic knitted fabric showed that rebound behavior appeared in all the samples on the horizontal surface, when the water droplet was small. However, with large droplets, the rebound behavior appeared only in purl stitches. Meanwhile, on the surface inclined at 15°, rebound behavior was observed in the tuck and purl stitches, with the tuck stitches rebounding faster in the wale direction and the purl stitches in the course direction regardless of the droplet volume. The plain jersey stitches showed pinning behavior after water droplets fell on the surface. Therefore, it is important not only to introduce nano-roughness but also properly to form geometrical micro-roughness of knitted fabric with pores and loops to induce rebound behavior of water droplets.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Dynamic Behavior Of Water Droplets On Superhydrophobic Knitt...mentioning

confidence: 99%

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Study of superhydrophobicity according to surface structure of knitted fabrics

Lee

2022

Textile Research Journal

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“…A modified AATCC 100-2004 Test Method (termed as a sandwich method) was used to evaluate the antibacterial activities of samples against both Gram-positive S. aureus (ATCC 6538) and Gram-negative E. coli O157:H7 (ATCC 43895), which was a representative test for the evaluation of antibacterial efficiency [42,43]. An aliquot of 25 µl bacteria suspension was added to sandwich of the stacked two samples (2.54×2.54 cm).…”

Section: Antibacterial Evaluation Of the Treated Pet Fabricsmentioning

confidence: 99%

Development of PET Fabrics Containing N-halamine Compounds with Durable Antibacterial Property

et al. 2021

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Antibacterial textile materials are widely used in daily life, but most are disposable products with poor antibacterial durability. N-halamine can rapidly inactivate microorganisms, has good stability, and shows great potential applications in antibacterial fabrics. In this study, an N-halamine monomer precursor was synthesized and treated onto PET fabrics. The treated PET fabrics were rendered antibacterial functionality after chlorination, and exhibited good antibacterial properties with inactivation rate of 100.0 % for both E. coli O157:H7 and S. aureus. After 50 wash cycles, the chlorinated treated PET fabrics could maintain 80.0 % antibacterial efficacy, demonstrating durable antibacterial properties. Storage stability and UV irradiation tests showed that the treated PET fabrics had remarkable regenerable properties. The reduction of the breaking strength was within 12 % after treatment, which is in a satisfying range in antimicrobial finishing.

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“…To further expand the application of coated textiles, the morphology variation, spreading diameter, energy conversion, and adhesion of the impacted droplet should be investigated. 16 In addition to demonstrating surface wetting behaviors in static states, droplets that fall on superhydrophobic surfaces exhibit numerous dynamic behaviors that play important roles in the self-cleaning processes of these surfaces. Accordingly, droplet impact on different structures has been studied for the continuous development of superhydrophobic surfaces.…”

mentioning

confidence: 99%

Dynamic behaviors of water droplets on superhydrophobic polyester films and woven and knitted fabrics

Lee

Park

2022

Textile Research Journal

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In this study, the behaviors of water droplets on superhydrophobic polyester (PET) films as well as on woven and knitted fabrics with different surface microstructures were analyzed. The water droplet volume, height of release ( h), and surface inclination were modified to study the dynamic behavior of water droplets using a pressure balance and the Weber number ( We). The droplet volume did not affect the static contact angle. However, the shedding and sliding angles decreased with an increase in droplet volume. The water droplets rebounded on the surface of the superhydrophobic PET films with nano-roughness regardless of the surface inclination angle or h. However, the water droplets with h = 10 cm were pinned on the horizontal surfaces of the woven and knitted fabrics with micro-sized pores, where the dynamic pressure ( Pd) exceeded the capillary pressure. On an inclined surface, the water droplets rebounded on the surface of the woven fabric, owing to a decrease in Pd and an increase in the surface inclination angle. However, on the surface of the knitted fabric, pinning was observed even when the surface was tilted, regardless of the inclination angle. The sliding velocity of the droplets after rebound decreased in the following order: film, knitted fabric, woven fabric. With an increase in the inclination angle of the surface and the droplet volume, the sliding velocity increased, which was accompanied by a decrease in vertical impact velocity ( V) and an increase in the gravitational force. In terms of We, the droplets with a low We rebounded on all superhydrophobic surfaces, whereas the droplets with a high We were pinned on the surface of the woven and knitted fabrics.

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Dynamic hydrophobic behavior of water droplets impact on the cotton fabrics coated with POSS block copolymer

Cited by 5 publications

References 37 publications

Study of superhydrophobicity according to surface structure of knitted fabrics

Study of superhydrophobicity according to surface structure of knitted fabrics

Development of PET Fabrics Containing N-halamine Compounds with Durable Antibacterial Property

Dynamic behaviors of water droplets on superhydrophobic polyester films and woven and knitted fabrics

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