Fabrication and directed assembly of magnetic Janus rods

Zhao, Bin; Zhou, Hui; Liu, Chuanyong; Long, Yue; Yang, Guoqiang; Tung, Chen‐Ho; Song, Kai

doi:10.1039/c6nj00825a

Cited by 26 publications

(22 citation statements)

References 30 publications

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“…Similarly, Janus silica rods having an Fe 3 O 4 particle on one end were self‐assembled into chain‐like structures under the influence of a magnetic field . Folter et al.…”

Section: Self‐assemblymentioning

confidence: 99%

“…Similarly,J anus silica rods having an Fe 3 O 4 particleo no ne end were self-assembled into chain-like structures under the influence of am agnetic field. [48] Folter et al demonstrated the assembly of rods alone and rods with cubes in confined molecular tube environments. [49] Cubes joined with each other and rods joined end-to-end insteado fs ide-to-side.…”

Section: Self-assemblymentioning

confidence: 99%

See 1 more Smart Citation

Finite‐Sized One‐Dimensional Silica Microstructures (Rods): Synthesis, Assembly, and Applications

Sharma

2017

ChemNanoMat

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Colloidal silica structures are very important for applications such as superhydrophobic, oleophobic, icephobic, and anti‐biofouling coatings, polymer–ceramic or metal–matrix composites, photon management, catalyst support, and drug delivery. In addition to various types of silica structures, a unique structure—silica rods—has been synthesized by employing the emulsion droplets made by adding water and citrate to polyvinylpyrrolidone pentanol solution. While significant progress has been made in modifying rod shape and chemistry, in rod assembly, and in rod applications, however, no review article has discussed the progress in this field. This Focus Review intends to highlight the developments in the synthesis, assembly, and application of these rods, and discuss the remaining challenges for precise control of size and shape, possible solutions, and potential applications.

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“…Similarly, Janus silica rods having an Fe 3 O 4 particle on one end were self‐assembled into chain‐like structures under the influence of a magnetic field . Folter et al.…”

Section: Self‐assemblymentioning

confidence: 99%

Section: Self-assemblymentioning

confidence: 99%

Finite‐Sized One‐Dimensional Silica Microstructures (Rods): Synthesis, Assembly, and Applications

Sharma

2017

ChemNanoMat

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“…Self-assembly and subsequent cross-linking of polymer chains can also produce Janus nanoparticles [12]. Janus rods can be prepared by forming silica using TEOS by the sol-gel method on Fe 3 O 4 regioselectively [13]. Janus cylinders can be prepared by masking one side of a cylinder and conducting subsequent modification of the other side [14].Janus nanosheets exhibit the highest anisotropy among Janus compounds due to their unique morphology.…”

mentioning

confidence: 99%

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

Suzuki¹,

Sudo²,

Hirano³

et al. 2019

Functional Materials

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Inorganic Janus nanosheets were successfully prepared using the difference in reactivity between interlayers I and II of layered hexaniobate K 4 Nb6O 17 ·3H 2 O. Janus nanosheets exhibit the highest anisotropy among Janus compounds due to their morphology. It is therefore important to prepare Janus nanosheets with stable shapes in various solvents, robust chemical bonds between nanosheets and fuctional groups and high versatility due to surface functional groups. K 4 Nb 6 O 17 ·3H 2 O, which possesses two types of interlayers and two types of organophosphonic acids that react with metal oxides to form robust covalent bonds, was employed to prepare Janus nanosheets for this study. Interlayer I was modified by octadecylphosphonic acid, followed by modification by carboxypropylphosphonic acid mainly at interlayer II. Preparation of Janus nanosheets with two organophosphonate moieties was confirmed by 31 P MAS NMR. After these regioselective and sequential modifications, the products were exfoliated into single-layered nanosheets in THF. Two types of derivatives with different repeating distances were recovered from a dispersion containing nanosheets exfoliated by different processes, centrifugation, and solvent evaporation. AFM analysis of the exfoliated nanosheets revealed that the products were Janus compounds. There are high expectations for application of these types of Janus nanosheets in various fields and for design of various Janus nanosheets using this preparation method.There are various methods of preparing Janus nanoparticles. Regioselective surface modification of nanoparticles can produce Janus nanoparticles [11]. By forming nanoparticles with two raw materials, Janus nanoparticles with different compositions can be prepared [2]. Self-assembly and subsequent cross-linking of polymer chains can also produce Janus nanoparticles [12]. Janus rods can be prepared by forming silica using TEOS by the sol-gel method on Fe 3 O 4 regioselectively [13]. Janus cylinders can be prepared by masking one side of a cylinder and conducting subsequent modification of the other side [14].Janus nanosheets exhibit the highest anisotropy among Janus compounds due to their unique morphology. They are also useful as emulsifiers, because Janus nanosheets cannot rotate at the interfaces of micelles [15]. Most Janus nanosheets reported so far have consisted of polymers. Stupp et al. reported the preparation of Janus nanosheets by polymerization of oligomers with polymerizable groups [16]. Polymerization of oligomers led to the formation of sheet morphology, because the polymerizable groups were located at the center of an oligomer. Walther et al. used triblock copolymers, polystyrene-block-polybutadiene-block-poly(tert-butyl methacrylate), for preparing Janus nanosheets [17]. Janus nanosheets were prepared by cross-linking polybutadiene domains of the triblock copolymers, and the resulting Janus nanosheets had two types of surfaces, polystyrene, and poly(tertbutyl methacrylate) moieties. These methods are based on selective polym...

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“…They can be divided into three subgroups of hard (inorganic), soft (organic or polymeric), and hybrid (organic/inorganic) JPs. Apart from conventional spherical shapes, many other geometries of JPs, such as dumbbell-like [2][3][4][5], snowman-like [6][7][8][9][10][11][12][13], platelet-like [14][15][16], or rod-like [17,18] shapes, have been successfully obtained. Casagrande et al first applied the term "Janus beads" in 1988 to describe the behavior of amphiphilic beads at water/oil interfaces [19].…”

Section: 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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Fabrication and directed assembly of magnetic Janus rods

Abstract: Varied morphologies and aspect ratios of magnetic Janus rods have been synthesized via a wet-chemical method.

Cited by 26 publications

References 30 publications

Finite‐Sized One‐Dimensional Silica Microstructures (Rods): Synthesis, Assembly, and Applications

Finite‐Sized One‐Dimensional Silica Microstructures (Rods): Synthesis, Assembly, and Applications

Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification

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

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Fabrication and directed assembly of magnetic Janus rods

Abstract: Varied morphologies and aspect ratios of magnetic Janus rods have been synthesized via a wet-chemical method.

Cited by 26 publications

References 30 publications

Finite‐Sized One‐Dimensional Silica Microstructures (Rods): Synthesis, Assembly, and Applications

Finite‐Sized One‐Dimensional Silica Microstructures (Rods): Synthesis, Assembly, and Applications

Janus Nanosheets Derived from K4Nb6O17·3H2O via Regioselective Interlayer Surface Modification

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

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Janus Nanosheets Derived from K₄Nb₆O₁₇·3H₂O via Regioselective Interlayer Surface Modification