Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration

Müssig, Stephan; Kuttich, Björn; Fidler, Florian; Haddad, Daniel; Wintzheimer, Susanne; Kraus, Tobias; Mandel, Karl

doi:10.1039/d1na00159k

Cited by 13 publications

(15 citation statements)

References 27 publications

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“…This is, as upon agglomeration of magnetic nanoparticles, their close proximity strongly alters their magnetic properties in the utilized setup. [37][38][39] Thus, the hierarchical approach prevents strong coupling of individual nanoparticles [40] and is key to distinguish different compositions by MPS. The different supraparticles can still be easily distinguished after several weeks of storage in ambient conditions, which is essential for a functional marker (see Figure S10, Supporting Information).…”

Section: Adapting the Principle Of A Musical Ensemble To Create An Advanced Magnetic Marker Supraparticlementioning

confidence: 99%

A Single Magnetic Particle with Nearly Unlimited Encoding Options

Müssig

Reichstein

Prieschl

et al. 2021

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Communicating objects are demanded for product security and the concepts of a circular economy or the Internet of Nano Things. Smart additives in the form of particles can be the key to equip objects with the desired materials intelligence as their miniaturized size improves applicability and security. Beyond their proposed identification by optical signals, magnetic signals deriving from magnetic particles can hypothetically be used for identification but are to date only resolved roughly. Herein, a magnetic particle‐based toolbox is reported, that provides more than 77 billion (77 × 109) different magnetic codes, adjustable in one single particle, that can be read out unambiguously, easily, and quickly. The key towards achieving the vast code variety is a hierarchical supraparticle design that is inspired by music: similarly to how the line‐up variation of a musical ensemble yields distinguishable overtones, the variation of the supraparticle composition alters their magnetic overtones. By minimizing magnetic interactions, customizable signals are spectrally decoded by the simple method of magnetic particle spectroscopy. A large number of chemically adjustable magnetic codes and the possibility of their remote, contactless detection from within materials is a breakthrough for unexploited labeling applications and pave the way towards materials intelligence.

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Section: Adapting the Principle Of A Musical Ensemble To Create An Advanced Magnetic Marker Supraparticlementioning

confidence: 99%

A Single Magnetic Particle with Nearly Unlimited Encoding Options

Müssig

Reichstein

Prieschl

et al. 2021

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“…Due to the fast measurement speed of seconds and the sensitivity towards structural changes of supraparticles, [ 42 ] MPS has been very recently proven to be an emerging tool for deducing structural information about supraparticles indirectly due to their magnetic properties. [ 42–44 ] MPS was used to spectrally analyze the magnetization amplitude of supraparticles modified by ALD as a function of harmonics ( Figure a).…”

Section: Resultsmentioning

confidence: 99%

Spray‐Drying and Atomic Layer Deposition: Complementary Tools toward Fully Orthogonal Control of Bulk Composition and Surface Identity of Multifunctional Supraparticles

et al. 2021

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Spray‐drying is a scalable process enabling one to assemble freely chosen nanoparticles into supraparticles. Atomic layer deposition (ALD) allows for controlled thin film deposition of a vast variety of materials including exotic ones that can hardly be synthesized by wet chemical methods. The properties of coated supraparticles are defined not only by the nanoparticle material chosen and the nanostructure adjusted during spray‐drying but also by surface functionalities modified by ALD, if ALD is capable of modifying not only the outer surfaces but also surfaces buried inside the porous supraparticle. Simultaneously, surface accessibility in the porous supraparticles must be ensured to make use of all functionalized surfaces. In this work, iron oxide supraparticles are utilized as a model substrate as their magnetic properties enable the use of advanced magnetic characterization methods. Detailed information about the structural evolution upon individual ALD cycles of aluminium oxide, zinc oxide and titanium dioxide are thereby revealed and confirmed by gas sorption analyses. This demonstrates a powerful and versatile approach to freely designing the functionality of future materials by combination of spray‐drying and ALD.

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Section: Recently Developed Applicationsmentioning

confidence: 99%

“…A detailed presentation of ferrofluid-driven assembly, functionalization procedures, and structural and magnetoresponsive properties of multicore particles is beyond the aim of this paper and we refer in this respect to recently published papers and comprehensive reviews. 43,662,[668][669][670][671][672][673][674][675] Fig. 39 The magnetorheological effect is attributed to the field-induced large agglomerates of the disperse phase, high saturation magnetization soft (usually multi-domain iron) micrometer size particles, relative to the continuous phase, usually a mineral or synthetic oil, a composition specific to conventional magnetorheological suspensions used in a lot of high-tech devices.…”

Section: Looking Back: Two Highly Successful Ferrofluid Applicationsmentioning

confidence: 99%

Ferrofluids and bio-ferrofluids: looking back and stepping forward

et al. 2022

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Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration

Abstract: The controlled agglomeration of superparamagnetic iron oxide nanoparticles (SPIONs) was used to rapidly switch their magnetic properties. Small-angle X-ray scattering (SAXS) and dynamic light scattering showed that tailored iron oxide...

Cited by 13 publications

References 27 publications

A Single Magnetic Particle with Nearly Unlimited Encoding Options

A Single Magnetic Particle with Nearly Unlimited Encoding Options

Spray‐Drying and Atomic Layer Deposition: Complementary Tools toward Fully Orthogonal Control of Bulk Composition and Surface Identity of Multifunctional Supraparticles

Ferrofluids and bio-ferrofluids: looking back and stepping forward

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