A versatile colloidal Janus platform: surface asymmetry control, functionalization, and applications

Wu, Chengjiao; Deng, Ziwei; Shang, Bin; Ikkala, Olli; Peng, Bo

doi:10.1039/c8cc06830e

Cited by 23 publications

(16 citation statements)

References 33 publications

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“…H 2 N‐PDMS‐NH 2 is not only hidden within the particles but also preferably staying at the interface of the particles and aqueous media to minimize the overall interfacial energy, resulting in surfaces with low interfacial tensions. [ 46,56 ] Thanks to the adhesive feature of the PDA, [ 48,57,58 ] these composite particles are simultaneously attached to the surface of the substrates, generating hierarchical surfaces that are superhydrophobic.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonication‐Assisted Waterborne Synthesis of Self‐Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection

Liu

Gao

et al. 2020

Adv Materials Inter

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Self‐restorable superhydrophobic surfaces have attracted increasing attention due to their important applications. However, great challenges in an easy and rapid way to accomplish superhydrophobic surfaces with tunable self‐restorability are retained. Here, a facile yet fast strategy is presented to endow commercial substrates with self‐restorable superhydrophobic surfaces irrespective of their surface chemistry and geometry. By ultrasonicating an aqueous solution comprising poly(dimethylsiloxane), bis(3‐aminopropyl)‐terminated (H2N‐PDMS‐NH2) and dopamine hydrochloride (DA) with substrates for 30 min, superhydrophobic surfaces are yielded. Under ultrasonication, H2N‐PDMS‐NH2 is dispersed as the microdroplets and produces a weakly alkaline environment to enhance self‐polymerization of DA to polydopamine (PDA). In turn, PDA reacts with microdroplets and simultaneously anchors them to substrates, creating hierarchical morphology. The diffusion of hydrophobic H2N‐PDMS‐NH2 from the interior to the surface of the coating leads to superhydrophobic surface. This superhydrophobicity is self‐restorable after it is destroyed by air‐plasma or amphiphilic molecules, presumably because the H2N‐PDMS‐NH2 diffusion from the interior to the particles’ surface minimizes the overall interfacial‐energy. The self‐restoration is significantly accelerated by heating or rubbing the substrates. This self‐restoration offers superhydrophobic materials with a considerably prolonged life‐span, promising a wide range of applications, e.g., sustainable oil/water separation.

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Section: Resultsmentioning

confidence: 99%

Ultrasonication‐Assisted Waterborne Synthesis of Self‐Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection

Liu

Gao

et al. 2020

Adv Materials Inter

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“…The splitting between Ti2p1/2 and Ti2p3/2 is about 5.8 eV, suggesting that the presence of the TiO2 within the coatings. During this coating process, dopamine tended to self-polymerize into polydopamine (PDA) coatings in a weakly alkaline environment in the presence of oxygen, which served as a favorable platform for loading TiO2 nanoparticles [33,34,[40][41][42] .Due to the strong metal coordination ability of the catechol groups in PDA, the as-formed PDA facilitated the in situ deposition of TiO2 nanoparticles, improving the binding affinity between the stainless-steel mesh and TiO2 nanoparticles [32,34,35,43,44]. Consequently, the hierarchical surfaces were observed.…”

Section: Preparation Of Superhydrophobic Pda-based Tio2 Coated Meshmentioning

confidence: 99%

“…Using a simple solvothermal method, PDA assists TiO2 particles exclusively bonding to stainless-steel mesh, resulting in micro/nanoscale hierarchical surface topology. It is worth noting that mussel inspired PDA coatings can not only serve as a versatile platform for loading TiO2 nanoparticles, but also act as the effective agent to modify the surface of TiO2, resulting in the highly active photocatalyst for photodegradation of water-soluble organic pollutants [32][33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

Composite polydopamine-based TiO2 coated mesh with restorable superhydrophobic surfaces for wastewater treatment

Wang

Zhang²,

Liu

et al. 2021

J Mater Sci

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Various pollutants in wastewater including water-insoluble oils and -soluble toxic organic pollutants, have been threatening ecosystems and human health, making wastewater purification difficult. Inspired by the hierarchical structures and chemical compositions of lotus leaf, we combined the usage of polydopamine (PDA) chemistry and photocatalytically active TiO2 to develop a facile approach towards composite PDA-based TiO2 coated mesh with restorable superhydrophobicity. In this procedure, PDA assisted loading of TiO2 nanoparticles onto stainlesssteel mesh with a result of micro/nanoscale hierarchical surface was achieved via a single-step solvothermal method. After modified with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane, this mesh became superhydrophobic. The TiO2 coated mesh exhibited enhanced superhydrophobicity, excellent environmental stability, robust chemical resistance and high mechanical durability.Moreover, it has been demonstrated the high separation capacity and extraordinary recyclability for various oils collection from water due to its special surface superhydrophobicity. Importantly, such a mesh possessed photocatalytic activity due to the embedded TiO2, which allowed for the effective degradation of organic pollutants under UV irradiation, representing a plausible way to restore superhydrophobic surface by photocatalytically decomposing the attached contaminants. This investigation suggests a green and facile way to prepare superhydrophobic materials with restored surface wetting property, which will be useful for wastewater purification.

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“…A recent example about the development and use of a silver‐doped colloidal Janus platform is briefly mentioned here . It has been made by modifying the wetting properties of SiO 2 with APTES and dichlorodimethylsilane in varied ratios.…”

Section: Removal Of Toxic Materialsmentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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A versatile colloidal Janus platform: surface asymmetry control, functionalization, and applications

Abstract: A versatile colloidal Janus platform with tunable surface asymmetries and functions was achieved and can play multiple roles as Pickering emulsifiers, catalysts and magnetic vectors in wastewater remedy.

Cited by 23 publications

References 33 publications

Ultrasonication‐Assisted Waterborne Synthesis of Self‐Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection

Ultrasonication‐Assisted Waterborne Synthesis of Self‐Restorable Superhydrophobic Surfaces with Prolonged Lifespan in Oil Collection

Composite polydopamine-based TiO2 coated mesh with restorable superhydrophobic surfaces for wastewater treatment

Polydopamine – its Prolific Use as Catalyst and Support Material

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