Facile fabrication of superhydrophobic coatings based on two silica sols

Huang, Yanfen; Yi, Shengping; Lv, Ziquan; Huang, Chi

doi:10.1007/s00396-016-3912-9

Cited by 17 publications

(9 citation statements)

References 38 publications

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“…9,26 Hysteresis values (apparent) as shown in Figure 4b,c and e,f (hind and forewing, respectively) with advancing and receding contact angles of 158°± 5°and 148°± 7°, respectively, are also comparable to those of the lotus leaf. 26 This also suggests that replication of the wing topography utilizing a chemistry of lower surface energy 27 may optimize these values. The superhydrophobic planthopper membrane is also resistant to impacting droplets (emulating rain) as shown in Figure 4d, where the droplet rebounds from the surface as opposed to being pinned after impact.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Insect Analogue to the Lotus Leaf: A Planthopper Wing Membrane Incorporating a Low-Adhesion, Nonwetting, Superhydrophobic, Bactericidal, and Biocompatible Surface

Watson

Green

Cribb

et al. 2017

ACS Appl. Mater. Interfaces

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Nature has produced many intriguing and spectacular surfaces at the micro- and nanoscales. These small surface decorations act for a singular or, in most cases, a range of functions. The minute landscape found on the lotus leaf is one such example, displaying antiwetting behavior and low adhesion with foreign particulate matter. Indeed the lotus leaf has often been considered the "benchmark" for such properties. One could expect that there are animal counterparts of this self-drying and self-cleaning surface system. In this study, we show that the planthopper insect wing (Desudaba danae) exhibits a remarkable architectural similarity to the lotus leaf surface. Not only does the wing demonstrate a topographical likeness, but some surface properties are also expressed, such as nonwetting behavior and low adhering forces with contaminants. In addition, the insect-wing cuticle exhibits an antibacterial property in which Gram-negative bacteria (Porphyromonas gingivalis) are killed over many consecutive waves of attacks over 7 days. In contrast, eukaryote cell associations, upon contact with the insect membrane, lead to a formation of integrated cell sheets (e.g., among human stem cells (SHED-MSC) and human dermal fibroblasts (HDF)). The multifunctional features of the insect membrane provide a potential natural template for man-made applications in which specific control of liquid, solid, and biological contacts is desired and required. Moreover, the planthopper wing cuticle provides a "new" natural surface with which numerous interfacial properties can be explored for a range of comparative studies with both natural and man-made materials.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Insect Analogue to the Lotus Leaf: A Planthopper Wing Membrane Incorporating a Low-Adhesion, Nonwetting, Superhydrophobic, Bactericidal, and Biocompatible Surface

Watson

Green

Cribb

et al. 2017

ACS Appl. Mater. Interfaces

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“…Nanotechnological advances have enabled the production of nanoscopically heterogeneous surfaces, that are often bio-inspired (Tripathy et al 2017) most notably by the so-called -lotus effect‖ (Huang et al 2016). Such plant leaves, and also certain insect wings, remain free of bacteria through self-cleaning and antibacterial properties, thought to be mediated by nanopillared arrays (Hasan et al 2013) that inherently represent a nanoscopically heterogeneous substratum surface.…”

Section: Nanoscopically Heterogeneous Substratum Surfacesmentioning

confidence: 99%

Emergent heterogeneous microenvironments in biofilms: substratum surface heterogeneity and bacterial adhesion force-sensing

Ren

Wang

Zhi

et al. 2018

FEMS Microbiology Reviews

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Phenotypically heterogeneous microenvironments emerge as biofilms mature across different environments. Phenotypic heterogeneity in biofilm sub-populations not obeying quorum sensing-dictated, collective group behavior may be considered as a strategy allowing non-conformists to survive hostile conditions. Heterogeneous phenotype development has been amply studied with respect to gene expression and genotypic changes, but 'biofilm genes' responsible for preprogrammed development of heterogeneous microenvironments in biofilms have never been discovered. Moreover, the question of what triggers the development of phenotypically heterogeneous microenvironments has never been addressed. The definition of biofilms as 'surface-adhering and surface-adapted' microbial communities contains the word 'surface' twice. This leads us to hypothesize that phenotypically heterogeneous microenvironments in biofilms develop as an adaptive response of initial colonizers to their adhering state, governed by the forces through which they adhere to a substratum surface. No surface is entirely homogeneous, while adhering bacteria can substantially contribute to stochastically occurring surface heterogeneity. Accordingly, bacterial adhesion forces sensed by initial colonizers differ across a substratum surface, leading to differential mechanical deformation of the cell wall and membrane, where many environmental sensors are located. Bacteria directly adhering to heterogeneous substratum domains therewith formulate their own local responses to their adhering state and command non-conformist behavior, leading to phenotypically heterogeneous microenvironments in biofilms.

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“…The organic-inorganic hybrid method is one of the most promising methods for fabricating superhydrophobic surfaces due to its low demand for equipment, simple operation, low cost, which is feasible for large-scale commercial applications [42]. In this study, two kinds of nanoparticles of SiO 2 and TiO 2 were used together to fabricate superhydrophobic coatings.…”

Section: Introductionmentioning

confidence: 99%

A cost-effective method for robust and anti-corrosive superhydrophobic coatings

Huang

Chen

et al. 2019

SN Appl. Sci.

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In this work, we developed a simple method to fabricate robust and anti-corrosive superhydrophobic coatings. The multiscale nano/microstructures were induced by styrene-butadiene-styrene and two kinds of nanoparticles of SiO 2 and TiO 2. The unique hierarchical structures contribute to the superhydrophobic coatings with a remarkable water contact angle of 154.4° and contact angle hysteresis of 2.1°. In particular, the superhydrophobic coatings exhibited excellent thermal stability, mechanical stability and self-cleaning property. The synergistic effect of SiO 2 nanoparticles and TiO 2 nanoparticles could improve corrosion resistance of the superhydrophobic coatings. The superhydrophobic coatings retained their original superhydrophobicity when directly soaked in 3.5 wt.% NaCl solution for 3 days. The electrochemical experiments show that the superhydrophobic coatings can significantly improve the corrosion resistance of aluminum plate. Furthermore, the superhydrophobic coatings were applied to oil/water separation. The superhydrophobic coatings give a promising prospect for practical applications in a broad range of fields based on their large-scale and low-cost fabrication method.

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Facile fabrication of superhydrophobic coatings based on two silica sols

Cited by 17 publications

References 38 publications

Insect Analogue to the Lotus Leaf: A Planthopper Wing Membrane Incorporating a Low-Adhesion, Nonwetting, Superhydrophobic, Bactericidal, and Biocompatible Surface

Insect Analogue to the Lotus Leaf: A Planthopper Wing Membrane Incorporating a Low-Adhesion, Nonwetting, Superhydrophobic, Bactericidal, and Biocompatible Surface

Emergent heterogeneous microenvironments in biofilms: substratum surface heterogeneity and bacterial adhesion force-sensing

A cost-effective method for robust and anti-corrosive superhydrophobic coatings

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