The pivotal step of nanoparticle functionalization for the preparation of functional and magnetic hybrid opal films

Scheid, Daniel; Stock, D.; Winter, Tamara; Gutmann, Torsten; Dietz, Christian; Gallei, Markus

doi:10.1039/c5tc04388c

Cited by 28 publications

(32 citation statements)

References 43 publications

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“…For example, metallopolymers with reversible redox properties are of interest for nano-electronics, electrocatalysis, information storage, nanopatterning, sensing, and also as responsive surfaces and capsules, active components of photonic crystal displays, emissive and photovoltaic materials, optical limiters and artificial enzymes, etc. [12][13][14][15][16][17] More recently, as discussed above, metallopoymers have been used for preparation of magnetic NPs with desired phase, composition and patterned nanostructures.…”

Section: Metallopolymer Precursorsmentioning

confidence: 99%

A molecular approach to magnetic metallic nanostructures from metallopolymer precursors

Dong

Meng

et al. 2018

Chem. Soc. Rev.

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In recent years, metallopolymers have attracted much attention as precursors to generate magnetic metal/metal alloy nanoparticles (NPs) through pyrolysis or photolysis because they offer the advantages of ease of solution processability, atomic level mixing and stoichiometric control over composition. The as-generated NPs usually possess narrow size distributions with precise control of composition and density per unit area. Moreover, patterned NPs can be achieved on various substrates in this way owing to the good film-forming property of metallopolymers and such work is important for many applications based on metal nanostructures. By combining the merits of both the solution processability of metallopolymers and nanoimprint lithography (NIL), a new platform can be created for fabricating bit-patterned media (BPM) and the next-generation of nanoscale ultra-high-density magnetic data storage devices. Furthermore, most of these metallopolymers can be used directly as a negative-tone resist to generate magnetic metallic nanostructures by electron-beam lithography and UV photolithography. Self-assembly and subsequent pyrolysis of metalloblock copolymers can also afford well-patterned magnetic metal or metal alloy NPs in situ with periodicity down to dozens of nanometers. In this review, we highlight the use of metallopolymer precursors for the synthesis of magnetic metal/metal alloy NPs and their nanostructures and the related applications.

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Section: Metallopolymer Precursorsmentioning

confidence: 99%

A molecular approach to magnetic metallic nanostructures from metallopolymer precursors

Dong

Meng

et al. 2018

Chem. Soc. Rev.

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“…Bottom: Scheme for the melt‐shear‐organization for the preparation of an opal film starting from the coagulated core/shell particle mass followed by compression between the plates of a moderately hot press. Reproduced with permission . Copyright 2014, 2016, Royal Society of Chemistry.…”

Section: Preparation Of Opal Films By Using the Melt‐shear Organizatimentioning

confidence: 99%

“…For this purpose, PFcMA‐containing particles, known to possess intriguing redox‐responsiveness and optical switching capabilities (see Section ), could be converted into magnetic nanorattles by thermal treatment. The iron oxide nanoparticles were entrapped in a silica hollow sphere in a single step, which again can be transferred to an emulsion for the polymerization of ethyl acrylate . The hybrid hard core soft shell particles could be fabricated into magnetic and switchable elastomeric opal films.…”

Section: Hybrid Opal Structures Inverse Opals and Porous Ceramics Bmentioning

confidence: 99%

Functional Polymer Opals and Porous Materials by Shear‐Induced Assembly of Tailor‐Made Particles

Gallei

2017

Macromol. Rapid Commun.

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Photonic band-gap materials attract enormous attention as potential candidates for a steadily increasing variety of applications. Based on the preparation of easily scalable monodisperse colloids, such optically attractive photonic materials can be prepared by an inexpensive and convenient bottom-up process. Artificial polymer opals can be prepared by shear-induced assembly of core/shell particles, yielding reversibly stretch-tunable materials with intriguing structural colors. This feature article highlights recent developments of core/shell particle design and shear-induced opal formation with focus on the combination of hard and soft materials as well as crosslinking strategies. Structure formation of opal materials relies on both the tailored core/shell architecture and the parameters for polymer processing. The emphasis of this feature article is on elucidating the particle design and incorporation of addressable moieties, i.e., stimuli-responsive polymers as well as elaborated crosslinking strategies for the preparation of smart (inverse) opal films, inorganic/organic opals, and ceramic precursors by shear-induced ordering.

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“…Schäfer et al developed a thermally induced cross-linking route as subsequent step after the melt-shear organization process, which proved to be feasible for thicker particle films (above 200 µm) in order to generate a homogeneous cross-linking density [ 23 ]. Additionally, the melt-shear organization technique was used for the preparation of opal films consisting of inorganic particles and soft polymer shell materials [ 29 , 30 , 31 ]. In order to avoid additional cross-linking steps after particle processing and to overcome issues with cross-linking efficiencies for thicker films (>150 μm), self-cross-linking reactions should be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Free-Standing and Self-Crosslinkable Hybrid Films by Core–Shell Particle Design and Processing

et al. 2017

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The utilization and preparation of functional hybrid films for optical sensing applications and membranes is of utmost importance. In this work, we report the convenient and scalable preparation of self-crosslinking particle-based films derived by directed self-assembly of alkoxysilane-based cross-linkers as part of a core-shell particle architecture. The synthesis of well-designed monodisperse core-shell particles by emulsion polymerization is the basic prerequisite for subsequent particle processing via the melt-shear organization technique. In more detail, the core particles consist of polystyrene (PS) or poly(methyl methacrylate) (PMMA), while the comparably soft particle shell consists of poly(ethyl acrylate) (PEA) and different alkoxysilane-based poly(methacrylate)s. For hybrid film formation and convenient self-cross-linking, different alkyl groups at the siloxane moieties were investigated in detail by solid-state Magic-Angle Spinning Nuclear Magnetic Resonance (MAS, NMR) spectroscopy revealing different crosslinking capabilities, which strongly influence the properties of the core or shell particle films with respect to transparency and iridescent reflection colors. Furthermore, solid-state NMR spectroscopy and investigation of the thermal properties by differential scanning calorimetry (DSC) measurements allow for insights into the cross-linking capabilities prior to and after synthesis, as well as after the thermally and pressure-induced processing steps. Subsequently, free-standing and self-crosslinked particle-based films featuring excellent particle order are obtained by application of the melt-shear organization technique, as shown by microscopy (TEM, SEM).

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The pivotal step of nanoparticle functionalization for the preparation of functional and magnetic hybrid opal films

Abstract: An efficient and universal surface modification protocol for silica nanoparticles is reported for the preparation of novel hybrid optical materials.

Cited by 28 publications

References 43 publications

A molecular approach to magnetic metallic nanostructures from metallopolymer precursors

A molecular approach to magnetic metallic nanostructures from metallopolymer precursors

Functional Polymer Opals and Porous Materials by Shear‐Induced Assembly of Tailor‐Made Particles

Free-Standing and Self-Crosslinkable Hybrid Films by Core–Shell Particle Design and Processing

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