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    Janus interface materials: a critical review and comparative study
    (Amer Chemical Soc, 2020) Söz, Çağla; Trosien, Simon; Biesalski, Markus
    In recent years, Janus interface materials with wettability contrast have attracted remarkable attention because of their beneficial properties and versatile potential applications in materials science including transport, purification/separation, analytical testing, and medical applications. Regarding the wide range of highly promising possible application areas, these materials will have a major impact on the next generation of smart systems. In this Review, our aim is to highlight the current status of the research on Janus interface materials with special emphasis on wettability contrast. In the first section, a brief history of the literature on Janus-type materials and interfaces, materials possessing different chemistries or topographies on opposing sites, is introduced. In the second section, theories behind wetting, including "wettability integration", are summarized, which can be regarded as the combination of opposing wetting properties within the same material. Afterwards, natural examples of Janus interfaces, a branch of superwettability integration, are discussed, which inspired the researchers to mimic the nature and develop artificial analogues. In the next section, the current status on artificial Janus interfaces with wettability contrast are reviewed, subcategories for which are implemented according to the (possible) application areas and also the origin of their base substrates. Then, the inorganic and organic based artificial Janus interfaces were compared in terms of advantages and disadvantages. Finally, a conclusion and outlook are given.
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    Öğe
    Superhydrophobic hybrid paper sheets with Janus-type wettability
    (Amer Chemical Soc, 2019) Soz, Cagla Kosak; Trosien, Simon; Biesalski, Markus
    [No abstract available]
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    Superhydrophobic hybrid paper sheets with janus-type wettability
    (2019) Söz, Çağla; Trosien, Simon; Biesalski, Markus
    Hybrid paper sheets, paper based materials composed of organic and inorganic constituents, with Janus type wetting properties were prepared. One side of the sheet was superhydrophobic whereas the untreated side preserved its hydropilicity, as shown in Figure 1. A thin coating composed of cross-linked poly(dimethyl siloxane) (PDMS) and inorganic particles of various sizes ranging from nanometers to several tens of micrometers was applied both onto the Whatman No. 1 filter paper and lab-engineered cotton linters-based paper substrates. Hybrid sheets with high chemical durability, mechanical stability, and flexibility were achieved due to the covalent attachment of the particles to paper fibers and the inherent elasticity of PDMS chains. They remained porous and permeable to gases. Moreover, they had liquid directing and confinement ability due to the gradual change in chemistry between the two sides exhibiting a dramatic wetting contrast. All of these properties make Janus type hybrid paper sheets potential candidates as wound dressings and/or bandages.
  • [ X ]
    Öğe
    Superhydrophobic hybrid paper sheets with janus-type wettability
    (Amer Chemical Soc, 2018) Söz, Çağla; Trosien, Simon; Biesalski, Markus
    We introduce the design of Janus-type paper sheets where one side of the paper exhibits superhydrophobic properties, whereas the other side of the sheet remains hydrophilic and therefore can take up aqueous solutions by capillary wicking. Such papers are being prepared by chemically immobilizing a thin hybrid coating on paper sheets that consists of cross-linked poly(dimethylsiloxane) (PDMS) and inorganic particles of various sizes ranging from nanometers to several tens of micrometers. Both commercially available Whatman No. 1 filter paper and lab-engineered cotton linters-based paper substrates were treated with this approach. The hybrid paper sheets have high chemical durability, mechanical stability, and flexibility because of a covalent attachment of the particles to paper fibers and the inherent elasticity of PDMS chains. In spite of the superhydrophobicity of the coating, the untreated side of the paper substrates preserved its hydrophilicity, resulting in Janus type wetting and wicking properties, respectively. The functionalized paper samples remained porous and permeable to gases, while possessing a gradual change in chemistry between the two sides exhibiting a dramatic wetting contrast. Such two-sided properties open up new applications for such hybrid paper materials, such as in wound dressings and/or bandages with a liquid directing and confinement ability.