A “PDMS-in-water” emulsion enables mechanochemically robust superhydrophobic surfaces with self-healing nature

Ge, Mingzheng; Cao, Chunyan; Liang, Fanghua; Liu, Rong; Zhang, Yu; Zhang, Wei; Zhu, Tianxue; Yi, Bo; Tang, Yuxin; Lai, Yuekun

doi:10.1039/c9nh00519f

Cited by 220 publications

(92 citation statements)

References 85 publications

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“…For reality applications, long‐term damage and corrosion resistance are highly important for superhydrophobic coatings. [ 25 ] The mechanical durability of the ZIF‐8/PDMS coating was evaluated by tape‐peeling test and sandpaper abrasion, where the coating maintained superhydrophobicity even after 30 times of tape peeling and 70 times of abrasion (Figure S9, Supporting Information), indicating the mechanical robustness of the coating. In addition, the chemical stability of the coating was also tested by immersing in high concentration acidic and alkaline solutions as well as different organic solvents.…”

Section: Resultsmentioning

confidence: 99%

Coordination‐Driven Assembly of Metal–Organic Framework Coating for Catalytically Active Superhydrophobic Surface

Wong

Hou

et al. 2020

Adv Materials Inter

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Here, a superhydrophobic and catalytically active metal–organic framework (MOF) coating is reported by coordination‐driven assembly of MOF nanoparticles and a catechol‐functionalized polysiloxane polymer. This MOF coating can be fabricated by casting MOF‐polymer precursor onto diverse substrates with varied coating techniques, for example, spray coating, bar coating, and dip coating. The catechol‐functionalized polymer can not only coordinate to the open metal sites on MOF surface which enables the surface functionalization and assembly of MOF nanoparticles, but also allow non‐covalent interactions with casting substrates—thus improving the substrate adhesion of the MOF coating. With the well‐preserved porosity and surface hydrophobicity, the MOF coating demonstrates superhydrophobicity as well as improved catalytic activity toward the Knoevenagel condensation at room temperature. Such coordination‐driven assembly approach can be extended to a range of MOF systems for preparing highly functional composite materials toward various applications.

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Section: Resultsmentioning

confidence: 99%

Coordination‐Driven Assembly of Metal–Organic Framework Coating for Catalytically Active Superhydrophobic Surface

Wong

Hou

et al. 2020

Adv Materials Inter

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“…Amphiphilic molecules can help to enhance the synthetic reaction of PDMS in an aqueous solvent by increasing the interaction between the oil(polymer)/water phase. The alternative synthetic pathway is a safe, low-pollution and economically competitive pathway [ 27 , 28 ]. Generally, tetraethylorthosilicate (TEOS) is used as the precursor and crosslinker for forming a siloxane network between PDMS chains in membranes via a crosslinking reaction under the hydrolysis–condensation mechanism [ 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Green Synthesis Process on Asymmetric Hybrid PDMS Membrane for Efficient CO2/N2 Separation

Zhuang

Wey

et al. 2021

Membranes

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The effects of green processes in hybrid polydimethylsiloxane (PDMS) membranes on CO2 separation have received little attention to date. The effective CO2 separation of the membranes is believed to be controlled by the reaction and curing process. In this study, hybrid PDMS membranes were fabricated on ceramic substrates using the water-in-emulsion method and evaluated for their gas transport properties. The effects of the tetraethylorthosilicate (TEOS) concentration and curing temperature on the morphology and CO2 separation performance were investigated. The viscosity measurement showed that, at specific reaction times, it is benefit beneficial to fabricate the symmetric hybrid PDMS membranes with a uniform and dense selective layer on the substrate. Moreover, the a high TEOS concentration can decrease the reaction time and obtain create the a fully crosslinked structure, allowing more efficient CO2/N2 separation. The separation performance was furtherly improved with in the membrane prepared at a high curing temperature of 120 °C. The developed membrane shows excellent CO2/N2 separation with a CO2 permeance of 27.7 ± 1.3 GPU and a CO2/N2 selectivity of 10.3 ± 0.3. Moreover, the membrane shows a stable gas separation performance of up to 5 bar of pressure.

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“…The wings of the dragonfly Hemianax papuensis contains nanopillars, which form a fractal structure resulting in an extremely water-repellent surface (WCA ~ 161°) (Ivanova et al, 2013 ; Crawford and Ivanova, 2015 ). Since the advent of electron microscopies, which allowed the discovery of the surface features that allow the superhydrophobic phenomenon in natural species, scientists have sought to engineer artificial superhydrophobic surfaces (Ge et al, 2020b ; Liao et al, 2020 ; Shao et al, 2020 ). Mimicking of superhydrophobic surfaces has since been successfully achieved in labs worldwide, and this branch of biomimicry has found many applications such as self-cleaning materials, protection of building materials, corrosion resistance, anti-icing, drag reduction, biomedical, and separation of oil/water mixtures and emulsions (Cheng et al, 2017 ; Cho et al, 2017 ; Gao et al, 2017b ; Siddiqui et al, 2017 ; Tang et al, 2017a ; Zhang et al, 2017b , 2018b ; Ren et al, 2018 ; Kang et al, 2020 ; Lu et al, 2020a , b ; Nine et al, 2020 ; Zhu et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

et al. 2020

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Oil/water mixtures are a potentially major source of environmental pollution if efficient separation technology is not employed during processing. A large volume of oil/water mixtures is produced via many manufacturing operations in food, petrochemical, mining, and metal industries and can be exposed to water sources on a regular basis. To date, several techniques are used in practice to deal with industrial oil/water mixtures and oil spills such as in situ burning of oil, bioremediation, and solidifiers, which change the physical shape of oil as a result of chemical interaction. Physical separation of oil/water mixtures is in industrial practice; however, the existing technologies to do so often require either dissipation of large amounts of energy (such as in cyclones and hydrocyclones) or large residence times or inventories of fluids (such as in decanters). Recently, materials with selective wettability have gained attention for application in separation of oil/water mixtures and surfactant stabilized emulsions. For example, a superhydrophobic material is selectively wettable toward oil while having a poor affinity for the aqueous phase; therefore, a superhydrophobic porous material can easily adsorb the oil while completely rejecting the water from an oil/water mixture, thus physically separating the two components. The ease of separation, low cost, and low-energy requirements are some of the other advantages offered by these materials over existing practices of oil/water separation. The present review aims to focus on the surface engineering aspects to achieve selectively wettability in materials and its their relationship with the separation of oil/water mixtures with particular focus on emulsions, on factors contributing to their stability, and on how wettability can be helpful in their separation. Finally, the challenges in application of superwettable materials will be highlighted, and potential solutions to improve the application of these materials will be put forward.

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A “PDMS-in-water” emulsion enables mechanochemically robust superhydrophobic surfaces with self-healing nature

Abstract: A “PDMS-in-water” emulsion approach is developed to construct a mechanochemically robust superhydrophobic cotton fabric with intelligent self-healing nature against intensive mechanical damage.

Cited by 220 publications

References 85 publications

Coordination‐Driven Assembly of Metal–Organic Framework Coating for Catalytically Active Superhydrophobic Surface

Coordination‐Driven Assembly of Metal–Organic Framework Coating for Catalytically Active Superhydrophobic Surface

Impacts of Green Synthesis Process on Asymmetric Hybrid PDMS Membrane for Efficient CO2/N2 Separation

Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

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