Durable and self-healing superhydrophobic surfaces for building materials

Zulfiqar, Usama; Awais, Muhammad; Hussain, Syed Zajif; Hussain, Irshad; Husain, Syed Wilayat; Subhani, Tayyab

doi:10.1016/j.matlet.2017.01.070

Cited by 58 publications

(26 citation statements)

References 12 publications

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“…The air entrapped in the pockets formed by hierarchical structure curtails the interaction of water with surface; thus giving rise to a superhydrophobic surface. [14,29,30] Similar pattern has been evidenced in the naturally superhydrophobic structures in plants and insects. [31] For example, Acrida cinerea, has microdenticles on its surface, which are supported by nanoscale wax crystals result in in a water contact angle of 151 .…”

Section: Resultssupporting

confidence: 75%

“…[8][9][10][11][12][13] Literature provides a good understanding of superhydrophobic phenomenon as mimicked by creating rough micrometer and nanometer scale hierarchical structures with low surface energy. [14][15][16]25,26] Hence, a variety of nanomaterials are used to generate hierarchical surface roughness necessary for superhydrophobic properties; some of these include nanodiamonds, silica, iron oxide, titania, alumina, carbon soot, and carbon nanotubes. [17,2,[18][19][20][21][22][23] To specifically exploit superhydrophobic surfaces for oil-water separation, these nanomaterials are usually deposited on porous substrates such as fabric, foam, mesh, and filter papers to fabricate the absorbent with selective wetting toward oil.…”

Section: Introductionmentioning

confidence: 99%

“…[6,13] Few of the combinations include zinc oxide/epoxy, atapulgite/epoxy, and calcium carbonate/PDMS. [5,14] Previously materials with hydrophobic properties, that is, contact angle <150 , have also been demonstrated for oil-water separation and the recent examples are polyurethane sponge, magnetite composite nanoparticles, and reduced graphene oxide, [27,28] which reveals that a materials must remain at least in hydrophobic range to realize oil-water separation.…”

Section: Introductionmentioning

confidence: 99%

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Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

et al. 2017

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The authors report durable and recyclable nanocomposite superhydrophobic coatings on two different substrates of fabric and mesh as prepared by titania nanoparticles and polydimethysiloxane (PDMS). The felted wool fabric and the steel mesh are initially coated with a thin layer of PDMS, which is followed by the deposition of nanocomposite coating of titania nanoparticles embedded in PDMS. The dual surface modification of two kinds of substrates generates highly hydrophobic surface character, which is retained after durability performance as measured in ultrasonication, sand, and emery paper abrasion tests. Oil-water separation experiments are performed using water mixtures with four oils, that is, n-hexane, toluene, kerosene, and diesel to ensure the industrial applications of prepared composite materials.Moreover, nanocomposite coatings are tested for several cycles of oil-water separation in harsh conditions such as hot water, sodium chloride, and hydrochloric acid. The adopted approach improves the separation performance by inducing durability of the prepared nanocomposite coatings along with introducing recyclable character.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

et al. 2017

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“…German silicon resin outer wall waterproof coating named “King of Lotus” was researched according the theory of “lotus effect.” Four characteristics were included: first one was that special microstructure was owned on surface; second one was that a good breathability was owned to the microstructure; the third one was that strong hydrophobic property was produced after 2 d soaking; the last one was that “lotus effect” could be produced after the surface was parched for about 24 d. However, the mechanical properties and durable performance of those coatings are limited for a long time. A durable and self‐healing superhydrophobic coating was obtained on building materials on brick, marble, and glass . Also, the self‐healing characteristic of the damaged surfaces was achieved by simple acetone treatment.…”

Section: Applicationmentioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

108

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decades, researchers have shown great interests in bionics, which was a new multidisciplinary subject inspired by biological characteristics and features to imitate it to build technology devices. [1] With the rise of biomimetic biomaterial researches, a lot of attention was paid on the observation of living organism, especially on plant leaves, such as lotus, rice, taro leaves, etc. [2] As the development of scanning electron microscope (SEM), a wealth of data dealing with SEM of plant surface has been published since 1960s. [3] The cuticular structure was investigated with regard to function, and substances that were secreted onto the cuticle had great effects on the surface properties, while intracuticular waxes were the main barrier to wettability. [4] Some kinds of special wettability like superhydrophobicity and superhydrophilicity were also found in other surfaces, such as self-cleaning lotus leaf, [5] hydrophilicity of red rose petals, [6,7] the anisotropic dewetting behavior on rice leaf, [8,9] hydrophobicity of shark skin, [10] gecko toe, [11] insect wings, [12] etc., and striking superhydrophobic force provided by a water strider's legs, [13] and they were all related to the unique microstructures on their surface. In fact, the special wettability of surfaces is attributed to the interaction of both the surface microstructures and surface covers. As the development and progress of the observation device, smaller nanosized structures were found on the microstructure, and better properties of multiscale hierarchical structure was shown then. [14] Wetting is a phenomenon that solid interface was transferred from solid-gas interface to solid-liquid interface, wettability was a kind of ability that a liquid could be unfolded on one solid surface. The wettability of surface could be characterized by contact angle (CA) of interface. Sliding angle (SA) and contact angle hysteresis were introduced to evaluate the highly valued superhydrophobicity and superhydrophilicity of surfaces. Superhydrophilicity was defied as that of CA was smaller than 5°, superhydrophobicity was defied as that of CA was greater than 150°, as well as a really small sliding angle. It is worth noting that many researchers applied themselves to excavate the theories under the phenomena. Young's equation, Wenzel equation, and Cassie-Baxter equation [15,16] were the representations of hundreds years of research results. Improving and developing Surfaces of plants and animals are evolved to optimal states to accommodate environments better after billions of years of natural selection. As the development of further study on bionics, surfaces with special wetting properties in nature are discovered, extremely related to the micro-/nanostructures on surface. The wetting models and wetting mechanism of several surfaces in nature are investigated, followed by lifting the veil of superhydrophobic field. Various facile, effective, and convenient methods for fabricating superhydrophobic surfaces are obtained and optimized in scientific research and ...

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“…The latter is based on a dynamic, reversible linkage/reaction, such as reversible covalent bonds, metalligand interactions, and multiple hydrogen bonding 4 , 5 . Particularly, reversible interactions are of particular interest due to their capability to heal repeated damage at the same position 6 .…”

Section: Introductionmentioning

confidence: 99%

Thermally assisted self-healing behavior of anhydride modified polybenzoxazines based on transesterification

Huang

Zhang

et al. 2018

Sci Rep

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A self-healing polybenzoxazine is synthesized solely based on dynamic ester bonds. For this purpose, an anhydride (succinic anhydride) was added into bisphenol F derived benzoxazine monomer before thermocuring. Owing to the transesterification of newly formed ester bonds, the thermoset network behaves as a thermoplastic at 140 °C in the presence of Zn (Ac)2, and shows self-healing properties even after multiple damage-healing cycles. Furthermore, kinetics study indicates that the transesterification is a first-order reaction and the activation energy is about 135.4 kJ/mol. This study proposes a facile and economical way to prepare self-healing polybenzoxazine. It has promising applications in coating, adhesive, and other smart materials that rely on structurally dynamic polymers.

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Durable and self-healing superhydrophobic surfaces for building materials

Cited by 58 publications

References 12 publications

Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

Durable and Recyclable Superhydrophobic Fabric and Mesh for Oil–Water Separation

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Thermally assisted self-healing behavior of anhydride modified polybenzoxazines based on transesterification

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