Ferromagnetic Mesostructured Alloys: Design of Ordered Mesostructured Alloys with Multicomponent Metals from Lyotropic Liquid Crystals

Yamauchi, Yusuke; Komatsu, Masaaki; Fuziwara, Minekazu; Nemoto, Y.; Sato, Keisuke; Yokoshima, Tokihiko; Sukegawa, Hiroaki; Inomata, Kohei; Kuroda, Kazuyuki

doi:10.1002/anie.200902934

Cited by 37 publications

(42 citation statements)

References 72 publications

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“…Block copolymers are traditionally utilized as direct templates under ultra-high concentration, namely, lyotropic liquid crystals (LLC), [37] for the synthesis of metal-based mesoporous materials. [38,39] The proposed approach is carried out under very low block copolymer concentration, which is distinctly different from the traditional LLC strategy. The presented method provides a new avenue for the creation of alloy nanomaterials with dendritic shape, which greatly contributes to the further development of novel intermetallic alloy nanodendrites with more complex compositions.…”

Section: Resultsmentioning

confidence: 99%

Controlled Aqueous Solution Synthesis of Platinum–Palladium Alloy Nanodendrites with Various Compositions Using Amphiphilic Triblock Copolymers

Wang

Yamauchi

2010

Chemistry An Asian Journal

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In a recent study, we demonstrated that Pluronic F127 triblock copolymer plays a critical role in the formation of dendritic Pt nanostructures (L. Wang, Y. Yamauchi, J. Am. Chem. Soc. 2009, 131, 9152-9153). Herein, we expand this concept to produce novel dendritic Pt-Pd alloy nanoparticles. In this paper, a very simple, one-step and efficient route is proposed to directly produce dendritic Pt-Pd alloy nanoparticles with high surface area in high yield, which is carried out simply by stirring an aqueous solution that contains K(2)PtCl(4) and Na(2)PdCl(4) binary precursors in the presence of Pluronic F127 block copolymer and ascorbic acid at room temperature within 30 min without the need for any template, seed-mediated growth, or additive. By simply changing the compositional ratios of the Pt and Pd sources in the precursor solutions, Pt-Pd nanodendrites with various compositions can be easily produced. Because of its unique simplicity, the proposed approach can be considered as a powerful strategy for producing Pt-Pd alloy nanoparticles with unique nanoarchitectures for commercial devices.

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Section: Resultsmentioning

confidence: 99%

Controlled Aqueous Solution Synthesis of Platinum–Palladium Alloy Nanodendrites with Various Compositions Using Amphiphilic Triblock Copolymers

Wang

Yamauchi

2010

Chemistry An Asian Journal

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“…The strongly size-related properties of nanomaterials offer unexpected and unprecedented behaviours, which bears great potential for innovative technological applications12345. Magnetic nano materials have attracted intensive research interest among magnetism researchers for decades due to their huge potential in technological applications, both in magnetic applications such as recording technology and in multidisciplinary exploration such as biology and medicine6789. The large specific surface area induces novel magnetic behaviour, such as exchange bias in pure ferromagnetic, ferrimagnetic, and antiferromagnetic nanoparticles10.…”

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confidence: 99%

Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Zeng

Sun

et al. 2014

Sci Rep

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We have studied the microstructure, surface states, valence fluctuations, magnetic properties, and exchange bias effect in MnO2 nanowires. High purity α-MnO2 rectangular nanowires were synthesized by a facile hydrothermal method with microwave-assisted procedures. The microstructure analysis indicates that the nanowires grow in the [0 0 1] direction with the (2 1 0) plane as the surface. Mn3+ and Mn2+ ions are not found in the system by X-ray photoelectron spectroscopy. The effective magnetic moment of the manganese ions fits in with the theoretical and experimental values of Mn4+ very well. The uncoupled spins in 3d3 orbitals of the Mn4+ ions in MnO6 octahedra on the rough surface are responsible for the net magnetic moment. Spin glass behavior is observed through magnetic measurements. Furthermore, the exchange bias effect is observed for the first time in pure α-MnO2 phase due to the coupling of the surface spin glass with the antiferromagnetic α-MnO2 matrix. These α-MnO2 nanowires, with a spin-glass-like behavior and with an exchange bias effect excited by the uncoupled surface spins, should therefore inspire further study concerning the origin, theory, and applicability of surface structure induced magnetism in nanostructures.

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“…4,33,34 An impressive recent example is the synthesis of multicomponent mesoporous alloys (Fe, Co, Ni,) with adjustable compositions by changing the ratio of metal salts dissolved in the aqueous domains of a non-ionic surfactant (Brij 56). 35 The results revealed that the ordering of binary Ni-Co mesostructures decreased with increasing Co content in the alloys. Furthermore, the tuneable ratio of Ni/Co in these mesostructures led to the controllable saturation magnetization.…”

Section: 1 Template Synthesismentioning

confidence: 91%

Nanoporous metals: fabrication strategies and advanced electrochemical applications in catalysis, sensing and energy systems

2012

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Nanoporous metals, a representative type of nanostructured material, possess intriguing properties to generate enormously promising potentials for various important applications. In particular, with the advances of fabrication strategies, nanoporous metals with a variety of superior properties including unique pore structure, large specific surface area and high electrical conductivity have fuelled up great interests to explore their electrocatalytic properties and greatly extend their emerging applications in electrochemical sensing and energy systems. This tutorial review attempts to summarize the recent important progress towards the development of nanoporous metals, with special emphasis on fabrication methods and advanced electrochemical applications, such as electrocatalysts, chemical sensors and energy systems. Key scientific issues and prospective directions of research are also discussed.

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Ferromagnetic Mesostructured Alloys: Design of Ordered Mesostructured Alloys with Multicomponent Metals from Lyotropic Liquid Crystals

Cited by 37 publications

References 72 publications

Controlled Aqueous Solution Synthesis of Platinum–Palladium Alloy Nanodendrites with Various Compositions Using Amphiphilic Triblock Copolymers

Controlled Aqueous Solution Synthesis of Platinum–Palladium Alloy Nanodendrites with Various Compositions Using Amphiphilic Triblock Copolymers

Uncoupled surface spin induced exchange bias in α-MnO2 nanowires

Nanoporous metals: fabrication strategies and advanced electrochemical applications in catalysis, sensing and energy systems

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