Spatial Isolation of Carbon and Silica in a Single Janus Mesoporous Nanoparticle with Tunable Amphiphilicity

Zhao, Tiancong; Zhu, Xiaodong; Hung, Chin‐Te; Wang, Peiyuan; Elzatahry, Ahmed A.; Al-Khalaf, Areej A.; Hozzein, Wael N.; Zhang, Fan; Li, Xiaomin; Zhao, Dongyuan

doi:10.1021/jacs.8b06127

Cited by 136 publications

(97 citation statements)

References 49 publications

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“…To date, a few papers have been published in the area of biphasic catalytic reactions . For such interfacial catalysis, the Janus carbon nanoreactors have shown great advantages, such as superior emulsion stability, enhanced interfacial areas, improved mass transfer among the two phases, and effective separation of catalysts and products.…”

Section: Applicationmentioning

confidence: 99%

“…After selectively loading of Pt nanoparticles and subsequent carbonization in a N 2 atmosphere, this Janus Pt/C&PMO carbon nanoreactor showed higher interfacial activity toward stabilizing in a water‐in‐oil Pickering emulsions and greater catalytic stability than the Pt/C catalyst (Figure d–f). Zhao and co‐workers also synthesized dual‐mesoporous Fe 3 O 4 @mC&mSiO 2 Janus nanoreactors through a surface‐charge‐mediated selective encapsulation approach with controllable wettability, which could be adjusted through the volume ratio of carbon and silica precursors (Figure g) . The obtained Pt‐modified Janus carbon nanoreactors with the optimal hydrophilic/hydrophobic ratio presented high a catalytic efficiency (100%) in the biphasic reduction of 4‐nitroanisole and the cascade synthesis of cinnamic acid with a high turnover frequency of 700 h −1 (Figure h).…”

Section: Applicationmentioning

confidence: 99%

“…h) Conversion−time plot of different Pt‐loaded catalysts: Pt loaded on the dual‐mesoporous Fe 3 O 4 @mC&mSiO 2 Janus nanoparticles (Pt/C&SiO 2 ), mesoporous Fe 3 O 4 &mSiO 2 Janus nanoparticles (Fe 3 O 4 &SiO 2 /Pt), and Pt/C. g,h) Reproduced with permission . Copyright 2018, American Chemical Society.…”

Section: Applicationmentioning

confidence: 99%

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Nanoengineering Carbon Spheres as Nanoreactors for Sustainable Energy Applications

2019

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adsorption. [1][2][3][4] Their suitability for these application is attributed to the very unique properties of colloidal carbon spheres such as tunable porous structures, controllable particle size, large surface area, and controllable surface chemistry. [5,6] All these properties of colloidal carbon spheres are highly dependent on their synthesis methodology. Over the past decades, great efforts have been made on the synthesis, characterization, and extension of the application of porous carbon spheres. More research advances on colloidal carbon spheres would provide new opportunities to understand their physical and chemical properties, as well as for the design and preparation of new structured carbon spheres built up from the molecular level, which can further provide guidelines for practical applications.To mimic the structure of cells, the asprepared artificial cells should own some properties such as spatial compartmentalization and selective permeability. Until now, polymersomes, [7] liposomes, [8] and multiple emulsions [9] have been used to imitate the structures and properties of natural cells. However, the softness, poor mechanical strength, and chemical robustness have hindered their practical applications. The carbon spheres are potentially promising candidates for construction of cell-like structures. The ideal colloidal carbon spheres should possess all or most of the following properties: a) large surface area and controllable surface functionalities for effective dispersion and loading of metal nanoparticles or other active species on their surface; b) superior conductivity to provide electron pathways; c) tunable porosity and particle size for facile mass transport; d) high stability for long term operation. [10][11][12][13] To achieve this goal, a series of synthetic strategies for these nanostructured carbon spheres have been developed, such as the Stöber method, [13] the template method, [14,15] hydrothermal carbonization (HTC), [16] and microemulsion polymerization. [17] To further modify the carbon spheres with various porous structures and functionalities, novel technologies for pore size control, surface modification, heteroatom doping, and graphitization engineering have also been developed and widely utilized.A number of excellent reviews on colloidal carbon spheres have been published in recent years, especially for energy storage applications. [1,5,18,19] In this context, this review article aims to systematically summarize the latest works, mainly focusing on synthetic approaches to optimized properties of Colloidal carbon sphere nanoreactors have been explored extensively as a class of versatile materials for various applications in energy storage, electrochemical conversion, and catalysis, due to their unique properties such as excellent electrical conductivity, high specific surface area, controlled porosity and permeability, and surface functionality. Here, the latest updated research on colloidal carbon sphere nanoreactor, in terms of both their synthesis and applications, is...

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Section: Applicationmentioning

confidence: 99%

Section: Applicationmentioning

confidence: 99%

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Nanoengineering Carbon Spheres as Nanoreactors for Sustainable Energy Applications

2019

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“…for Janus phase transfer catalysts [78]; and many others [79][80][81][82][83][84]. Although magnetic separation is an easy and fast technique widely used in research systems, its industrial implementation has not been extensively realized yet.…”

Section: Recovery and Recycling Of Janus Particlesmentioning

confidence: 99%

Janus particles: from concepts to environmentally friendly materials and sustainable applications

2020

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Janus particles represent a unique group of patchy particles combining two or more different physical or chemical functionalities at their opposite sides. Especially, individual Janus particles (JPs) with both chemical and geometrical anisotropy as well as their assembled layers provide considerable advantages over the conventional monofunctional particles or surfactant molecules offering (a) a high surface-to-volume ratio; (b) high interfacial activity; (c) target controlling and manipulation of their interfacial activity by external signals such as temperature, light, pH, or ionic strength and achieving switching between stable emulsions and macro-phase separation; (d) recovery and recycling; (e) controlling the mass transport across the interface between the two phases; and finally (f) tunable several functionalities in one particle allowing their use either as carrier materials for immobilized catalytically active substances or, alternatively, their site-selective attachment to substrates keeping another functionality active for further reactions. All these advantages of JPs make them exclusive materials for application in (bio-)catalysis and (bio-)sensing. Considering "green chemistry" aspects covering biogenic materials based on either natural or fully synthetic biocompatible and biodegradable polymers for the design of JPs may solve the problem of toxicity of some existing materials and open new paths for the development of more environmentally friendly and sustainable materials in the very near future. Considering the number of contributions published each year on the topic of Janus particles in general, the number of contributions regarding their environmentally friendly and sustainable applications is by far smaller. This certainly pinpoints an important challenge and is addressed in this review article. The first part of the review focuses on the synthesis of sustainable biogenic or biocompatible Janus particles, as well as strategies for their recovery, recycling, and reusability. The second part addresses recent advances in applications of biogenic/biocompatible and non-biocompatible JPs in environmental and biotechnological fields such as sensing of hazardous pollutants, water decontamination, and hydrogen production. Finally, we provide implications for the rational design of environmentally friendly and sustainable materials based on Janus particles.

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“…The rigidity of PDA also makes it a thickness‐tunable spacer and a robust template for constructing nanostructures with spatially separated building components . Duan and co‐workers developed a synthetic protocol for fabricating core–shell plasmonic nanoparticles with multiple built‐in nanogaps and tailorable optical properties (Figure c) .…”

Section: Recent Progress In Functional Macromolecule‐enabled Colloidamentioning

confidence: 99%

Functional Macromolecule‐Enabled Colloidal Synthesis: From Nanoparticle Engineering to Multifunctionality

Zhou

Hou

et al. 2019

Advanced Materials

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IntroductionColloidal nanoparticles of metals, metal oxides, semiconductors, and metal-organic frameworks (MOFs) are of significant interest in both fundamental research and practical applications, due to their unique optical, electrical, and catalytic properties. [1][2][3] Small molecule-based wet-chemical colloidal synthesis of nanoparticles has undergone considerable progress in precise control over structural parameters of products, such as their size, shape, composition, crystal facet, and surface The synthesis of well-defined inorganic colloidal nanostructures using functional macromolecules is an enabling technology that offers the possibility of fine-tuning the physicochemical properties of nanomaterials and has contributed to a broad range of practical applications. The utilization of functional reactive polymers and their colloidal assemblies leads to a high level of control over structural parameters of inorganic nanoparticles that are not easily accessible by conventional methods based on small-molecule ligands. Recent advances in polymerization techniques for synthetic polymers and newly exploited functions of natural biomacromolecules have opened up new avenues to monodisperse and multifunctional nanostructures consisting of integrated components with distinct chemistries but complementary properties. Here, the evolution of colloidal synthesis of inorganic nanoparticles is revisited. Then, the new developments of colloidal synthesis enabled by functional macromolecules and practical applications associated with the resulting optical, catalytic, and structural properties of colloidal nanostructures are summarized. Finally, a perspective on new and promising pathways to novel colloidal nanostructures built upon the continuous development of polymer chemistry, colloidal science, and nanochemistry is provided. Functional Macromolecules

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Spatial Isolation of Carbon and Silica in a Single Janus Mesoporous Nanoparticle with Tunable Amphiphilicity

Cited by 136 publications

References 49 publications

Nanoengineering Carbon Spheres as Nanoreactors for Sustainable Energy Applications

Nanoengineering Carbon Spheres as Nanoreactors for Sustainable Energy Applications

Janus particles: from concepts to environmentally friendly materials and sustainable applications

Functional Macromolecule‐Enabled Colloidal Synthesis: From Nanoparticle Engineering to Multifunctionality

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