Tunable superomniphobic surfaces for sorting droplets by surface tension

Movafaghi, Sanli; Wang, Wei; Metzger, Ari; Williams, Desiree D.; Williams, John D.; Kota, Arun K.

doi:10.1039/c6lc00673f

Cited by 42 publications

(45 citation statements)

References 45 publications

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“…[23] As another example, superhydrophobic surfaces have been used to create miniaturized labs for performing biological tests. [24–26] They have also been used to improve the efficiency of turbines and steam engines by reducing the buildup of water. [23] Some previous reports show that superhydrophobic surfaces tend to reduce the attachment of a range of bacteria strains, but other reports show attachment and biofilm formation, indicating that more investigation is needed.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial activity on superhydrophobic titania nanotube arrays

Bartlet

Movafaghi

Dasi

et al. 2018

Colloids and Surfaces B: Biointerfaces

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Bacterial infections are a serious issue for many implanted medical devices. Infections occur when bacteria colonize the surface of an implant and form a biofilm, a barrier which protects the bacterial colony from antibiotic treatments. Further, the anti-bacterial treatments must also be tailored to the specific bacteria that is causing the infection. The inherent protection of bacteria in the biofilm, differences in bacteria species (gram-positive vs. gram-negative), and the rise of antibiotic-resistant strains of bacteria makes device-acquired infections difficult to treat. Recent research has focused on reducing biofilm formation on medical devices by modifying implant surfaces. Proposed methods have included antibacterial surface coatings, release of antibacterial drugs from surfaces, and materials which promote the adhesion of non-pathogenic bacteria. However, no approach has proven successful in repelling both gram-positive and gram-negative bacteria. In this study, we have evaluated the ability of superhydrophobic surfaces to reduce bacteria adhesion regardless of whether the bacteria are gram-positive or gram-negative. Although superhydrophobic surfaces did not repel bacteria completely, they had minimal bacteria attached after 24 h and more importantly no biofilm formation was observed.

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Section: Introductionmentioning

confidence: 99%

Antibacterial activity on superhydrophobic titania nanotube arrays

Bartlet

Movafaghi

Dasi

et al. 2018

Colloids and Surfaces B: Biointerfaces

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“…11 The partially wetted state accounts for the remarkable properties of superhydrophobic materials, which have been the subject of much research recently. 12–21 The transition between these two wetting states occurs at a specific surface tension and triggers a large change in apparent contact angle, and is the basis for the mechanism of our sensors. The alcohol sensors (Figure 1A) are composed of a) an upper ‘responsive’ layer that allows wetting of liquids only below a specific surface tension, and b) a hydrophilic lower ‘indicator’ layer that wets completely and provides a color change from the dissolution of the incorporated dye, bromocresol purple.…”

Section: Resultsmentioning

confidence: 99%

Surface tension sensor meshes for rapid alcohol quantification

2017

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“…[39,42,43] Superhydrophobic surfaces can be systematically designed by combining low solid surface energy with appropriate microscale or nanoscale texture. [44][45][46][47][48][49][50][51][52] While textured superhydrophobic surfaces can prevent the accumulation of water and help retain the dielectric strength of insulators under wet conditions, the presence of texture reduces the dielectric strength due to the accumulation of charge on sharp features. [53][54][55] In this work, we investigated whether or not textured superhydrophobic surfaces can retain the dielectric strength under wet conditions.…”

Section: Superhydrophobic Insulatorsmentioning

confidence: 99%

“…A surface is considered to be superhydrophobic if it displays θ * > 150° and Δθ * < 10° with water . Superhydrophobic surfaces can be systematically designed by combining low solid surface energy with appropriate microscale or nanoscale texture …”

mentioning

confidence: 99%

Superhydrophobic Coatings for Improved Performance of Electrical Insulators

Vallabhuneni

Movafaghi

Wang

et al. 2018

Macro Materials & Eng

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Dielectric strength of electrical insulators is adversely affected by both wet conditions and surface roughness due to accelerated dielectric breakdown. While textured superhydrophobic coatings (i.e., coatings that are extremely repellent to water) can prevent the accumulation of water and help retain the dielectric strength of insulators under wet conditions, it is unclear whether or not the presence of texture (i.e., surface roughness) allows the retention of the dielectric strength of insulators. In this work, through a series of systematic experiments and analysis, it is concluded that porous superhydrophobic coatings rather than rough monolithic superhydrophobic surfaces allow the retention of dielectric strength of insulators under wet conditions in spite of the surface roughness. The insights from this work can enable the design of electrical insulators with improved performance and increased longevity.

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Tunable superomniphobic surfaces for sorting droplets by surface tension

Cited by 42 publications

References 45 publications

Antibacterial activity on superhydrophobic titania nanotube arrays

Antibacterial activity on superhydrophobic titania nanotube arrays

Surface tension sensor meshes for rapid alcohol quantification

Superhydrophobic Coatings for Improved Performance of Electrical Insulators

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