Highly ordered arrays of magnetic nanoparticles prepared via block copolymer assembly

Horechyy, Andriy; Zafeiropoulos, Nikolaos E.; Nandan, Bhanu; Formánek, Petr; Simon, Frank; Kiriy, Anton; Stamm, Manfred

doi:10.1039/c0jm01103g

Cited by 45 publications

(52 citation statements)

References 45 publications

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“…The dark areas in the bright-field image correspond to moreelectron-dense areas, and the contrast observed in the image suggests that electron-dense elements were homogeneously distributed in the areas. The EDS mapping images in Figures 1(b)-1(d) show that the Fe, Pt, and Ag precursors were introduced into the P4VP blocks and that the Fe precursor was introduced into the PS matrix, which is consistent with previous reports [23,24]. Spherical mesophase formation was driven by the selective dissolution of the PS block in the toluene-based solvent [25], which resulted in dissolution of the Fe, Pt, and Ag precursors into the P4VP block.…”

Section: Resultssupporting

confidence: 79%

Synthesis of a High-Coercivity FePt–Ag Nanocomposite Magnet via Block Copolymer-Templated Self-Assembly

Wakayama

Yonekura

2017

Journal of Nanomaterials

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Magnetic recording media are composed of magnetic thin films consisting of magnetically isolated crystallites. For practical use of magnetic particles as recording media, it will be necessary to realize high coercivity by fabricating nanocrystalline grains and forming grain boundaries with the nonmagnetic phase. In this study, a high-coercivity FePt-Ag nanocomposite magnet was synthesized by means of block copolymer-templated self-assembly. Precursors of Fe, Pt, and Ag were introduced into a polymer block, and the resulting material was oxidized and then reduced to form a nanocomposite consisting of FePt nanoparticles surrounded by a matrix of Ag. X-ray diffraction analysis revealed that the introduction of Ag did not significantly affect the crystalline ordering of the FePt. The addition of Ag increased the coercivity by 53% (from 11.1 to 17.0 kOe). Our results suggest that the grain boundaries of the nonmagnetic Ag metal acted as pinning sites, disrupting magnetic coupling between individual FePt nanocrystallites and hindering domain wall motion at an external magnetic field.

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Section: Resultssupporting

confidence: 79%

Synthesis of a High-Coercivity FePt–Ag Nanocomposite Magnet via Block Copolymer-Templated Self-Assembly

Wakayama

Yonekura

2017

Journal of Nanomaterials

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“…[32] Within this study, special polymers with carboxylic groups and coordinating groups were designed and synthesized. Another possibility is treatment with polymers having units that coordinate with Fe 3 O 4 , for instance poly(4-vinyl pyridine).…”

Section: Design Of Block Copolymer Compatibilizers For the Composite mentioning

confidence: 99%

Innovative Molecular Design for a Volume Oriented Component Diagnostic: Modified Magnetic Nanoparticles on High Performance Yarns for Smart Textiles

et al. 2014

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A novel way for destruction‐free, volume‐oriented component diagnostics is reported. Surface‐modified magnetic nanoparticles are applied for impregnation of plasma‐activated UHMW PE textiles, which are embedded into an epoxy matrix. Supported by simulations, this comprehensive study from single molecules to composites extends the knowledge of molecular interactions at polymer interfaces and broadens the application of non‐destructive methods.

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“…In addition, the block copolymer approach enables to create functionalized nanostructures by incorporating the functional block, which has conductive, fluorescent, stimulus‐responsive, cross‐linkable, degradable, metal‐coordinative, or liquid crystalline characteristics. For example, functionalized nanostructures and nanopatterns with nanoparticles or quantum dots (QDs) were demonstrated with block copolymers, which contained the block of nanoparticle‐binding groups . More examples can be found in the recent review article describing block‐copolymer‐based nanomaterials …”

Section: Introductionmentioning

confidence: 99%

“…For functionalization of nanostructures of block copolymers, single functionality has been typically included in the nanostructures . In this paper, we demonstrate dual functionalization of nanostructures of block copolymers by simultaneous incorporation of two functionalities into the nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Dual Functionalization of Nanostructures of Block Copolymers with Quantum Dots and Organic Fluorophores

Chae

Kim

Théato

et al. 2014

Macro Chemistry & Physics

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Dual functionalization of nanostructures of block copolymers by simultaneous incorporation of two functionalities into the nanostructures is demonstrated. For this purpose, a blending strategy of two block copolymers is employed, which have the same basic chemical structure for each block but differ in small amounts of functional moieties in one of the blocks. Block copolymers containing thiol and fluorophore functionalities are synthesized, utilizing a block copolymer that features a reactive block of activated esters. With thiol‐functionalized block copolymers, selective incorporation of quantum dots (QDs) to lamellar nanostructures is first validated by transmission electron microscopy. Fluorophore functionalization of lamellar nanostructures is also confirmed with fluorophore‐anchored block copolymers by photoluminescence spectroscopy. Then, with a blending strategy of two functionalized block copolymers, dual functionalization of lamellar nanostructures of block copolymers is induced by simultaneous incorporation of QDs and organic fluorophores, which exhibit fluorescence resonance energy transfer due to nanoscale confinement.

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Highly ordered arrays of magnetic nanoparticles prepared via block copolymer assembly

Cited by 45 publications

References 45 publications

Synthesis of a High-Coercivity FePt–Ag Nanocomposite Magnet via Block Copolymer-Templated Self-Assembly

Synthesis of a High-Coercivity FePt–Ag Nanocomposite Magnet via Block Copolymer-Templated Self-Assembly

Innovative Molecular Design for a Volume Oriented Component Diagnostic: Modified Magnetic Nanoparticles on High Performance Yarns for Smart Textiles

Dual Functionalization of Nanostructures of Block Copolymers with Quantum Dots and Organic Fluorophores

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