Superhydrophobic Coatings with Edible Materials

Wang, Wei; Lockwood, K. L.; Boyd, Lewis Marinoff; Davidson, Matthew D.; Movafaghi, Sanli; Vahabi, Hamed; Khetani, Salman R.; Kota, Arun K.

doi:10.1021/acsami.6b06958

Cited by 193 publications

(123 citation statements)

References 30 publications

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“…This is because of the reduced contact area between the droplet and the surface, which in turn is due to the presence of the air pockets. [44,45] This state is expected for NT-S1. It is expected that by minimizing the contact area between the liquid and a surface, bacterial adhesion and biofilm formation can be reduced.…”

Section: Resultsmentioning

confidence: 75%

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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: Resultsmentioning

confidence: 75%

“…[43] The Wenzel state is where the droplet penetrates the surface asperities, completely wetting the surface. [44,45] This state is expected for NT and NT-S2. The Cassie–Baxter state is when air pockets remain trapped within the texture, leading to the droplet being partly suspended above the surface.…”

Section: Resultsmentioning

confidence: 75%

Antibacterial activity on superhydrophobic titania nanotube arrays

Bartlet

Movafaghi

Dasi

et al. 2018

Colloids and Surfaces B: Biointerfaces

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“…Encouragingly, the concept of fabricating nontoxic, "roll-off", and superhydrophobic coatings with edible materials for readily slicking away residual food/drink-related liquids was recently proposed and demonstrated by researchers from two universities in the United States (Colorado State University and University of Illinois at Chicago) (Wang et al 2016). In this concept, a key feature is that FDA-approved, edible, and renewable biowaxes (i.e., carnauba wax and beeswax) are used in the preparation of superhydrophobic coatings.…”

Section: Engineering Of Containers With Biowax-based Superhydrophobicmentioning

confidence: 99%

Superhydrophobic Coatings with Edible Biowaxes for Reducing or Eliminating Liquid Residues of Foods and Drinks in Containers

Wang

Qian

Shen

2017

BioRes

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Biowaxes, including carnauba wax and beeswax, are edible and renewable. Once dispersed in a polar solvent, these natural materials could be easily converted into nontoxic, "roll-off", and superhydrophobic coatings on the basis of spray coating. The combination of container materials with these coatings can reduce or even eliminate liquid resides (including highly viscous residues) of foods and drinks in containers (e.g., bottles), significantly facilitating downstream operations. Comprehensive demonstrations of this green concept would generate huge opportunities for food/drink-related industries.

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“…[1] Since then, many different and effective methods have been utilized to produce hydrorepellent surfaces inspired by the lotus leaf. [2,[4][5][6][7] For instance, recently, fabricating nonwetting surfaces using only water-based solutions or suspensions has been successfully demonstrated. [2,[4][5][6][7] For instance, recently, fabricating nonwetting surfaces using only water-based solutions or suspensions has been successfully demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…[2,[4][5][6][7] For instance, recently, fabricating nonwetting surfaces using only water-based solutions or suspensions has been successfully demonstrated. [6,10,11] Superhydrophobic coatings and structures made solely by waxes suffer from thermal instability (low melting point of waxes), leaching, and mechanical fragility against certain degree of wear and abrasion. [6,10,11] Superhydrophobic coatings and structures made solely by waxes suffer from thermal instability (low melting point of waxes), leaching, and mechanical fragility against certain degree of wear and abrasion.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Coatings from Beeswax‐in‐Water Emulsions with Latent Heat Storage Capability

Naderizadeh

Heredia‐Guerrero

Caputo

et al. 2019

Adv Materials Inter

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Beeswax particles are homogenously emulsified in commercial aqueous polymer dispersion, without additional dispersing agents and surfactants. Emulsions display very good stability with wax droplet size distribution around 350 nm. The wax to polymer ratio in the emulsions can be tuned without compromising emulsion stability. The emulsions are spray coated in order to create either hydrophobic or superhydrophobic coatings. For superhydrophobicity, silica nanoparticles are dispersed in the emulsions at different concentrations. Beeswax‐rich coatings such as the ones with 1:1 beeswax:polymer ratio or more, including the superhydrophobic ones, demonstrate promising latent heat storage characteristics, suitable for thermal management applications. Electron microscopy studies show that as a result of emulsification, the polymer encapsulates the wax droplets/particles as a nanothin shell, preventing a major problem related to low melting point phase change materials referred to as leaching. Hence, the coatings can be heated well above the melting point of beeswax (≈62 °C) and can still demonstrate effective heat storage during the cooling stage. This water‐based coating process using ecofriendly material constituents can easily be scaled up and used in responsive coating applications, ranging from electronics to interior or exterior structural buildings requiring efficient energy management and thermal energy savings.

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Superhydrophobic Coatings with Edible Materials

Cited by 193 publications

References 30 publications

Antibacterial activity on superhydrophobic titania nanotube arrays

Antibacterial activity on superhydrophobic titania nanotube arrays

Superhydrophobic Coatings with Edible Biowaxes for Reducing or Eliminating Liquid Residues of Foods and Drinks in Containers

Superhydrophobic Coatings from Beeswax‐in‐Water Emulsions with Latent Heat Storage Capability

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