Effects of size reduction on the structure and magnetic properties of core–shell Ni3Si/silica nanoparticles prepared by electrochemical synthesis

Pigozzi, Giancarlo; Mukherji, D.; Elerman, Y.; Strunz, Pavel; Gilles, Ralph; Hoelzel, Markus; Barbier, Bruno; Schmutz, Patrik

doi:10.1016/j.jallcom.2013.09.035

Cited by 14 publications

(10 citation statements)

References 28 publications

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“…That the scaling effect is found for nanoparticles of different dimensions in the same alloy exclude the possibility that it is solely an oxidation effect in the electrolytic solution. The size effect is also observed in extraction of nanoparticles from different alloys 62 . However, the extraction process parameters (particularly the pH value of the electrolyte) may be varied in order to build up shells with different thickness.…”

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confidence: 84%

“…This technique was used to characterize core-shell nanoparticles produced by ESPD 61 . The distinctly different neutron scattering lengths of hydrogen and deuterium is exploited in the SANS contrast variation experiment to reveal details of structure and compositions at the interfaces 62 . An example is presented from the measurement of core-shell Ni 3 Si nanoparticles.…”

Section: (A) (B)mentioning

confidence: 99%

“…It is known that when a bulk ferromagnetic material is reduced to nano-size, single-domain magnetism dominates and the magnetic property of the material is changed. The extracted nanoparticles (β 1 -Ni 3 Si phase) exhibit a paramagnetic to ferromagnetic transition with low coercivity and saturation magnetisation (> 20 emu/g) at low temperatures (< 11 K) and this is interpreted as superparamagnetic behaviour of single domain nanoparticles 62 . Magnetic exchange interaction between silica shell and magnetic core is not expected, but the non-magnetic silica shell partially suppresses the overall magnetic signal of the nanoparticles.…”

Section: Magnetic Properties Of Nanoparticlementioning

confidence: 99%

“…It is possible to synthesised nanoparticle with a different PSD (e.g. bimodal with average particle size of 93 nm and 215 nm for the smaller and larger populations, respectively) from the same alloy, by differently heat treating the alloy before extracting the particle by ESPD 61,62 . This demonstrates the versatility of the ESPD method.…”

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confidence: 99%

“…They have different shell thicknesses: the bimodal Ni 3 Si-1 having an average shell thickness of 17 nm for the larger and 5 nm for the smaller size population, respectively 61 . The smaller size Ni 3 Si-2 nanoparticles have even thinner shell, only 3 nm thick 62 . It is apparent that the shell thickness scales with the particle size.…”

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confidence: 99%

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A Novel Method for the Synthesis of Core-shell Magnetic Nanoparticle

Mukherji

2016

Def. Sc. Jl.

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<p>Core-shell type magnetic nanoparticles are finding attractive applications in biomedicine, from diagnostic to cancer therapy. Both for targeted drug delivery and hyperthermia, as well as a contrast agent used for external biomedical imaging systems, small (< 20 nm) superparamagnetic nanoparticles are desired. Some iron oxide nanoparticle formulations are already approved for human administration as contrast agent for magnetic resonance imaging. However, search continues for nanoparticles with higher saturation magnetisation. Metallic, bi-metallic and intermetallic magnetic nanoparticles are finding attention. Biocompatibility and optimal clearance are important criteria for the medical applications and therefore core-shell type particles are favored, where a biocompatible shell (e.g. polymer, Silica) can prevent inadvertent host reaction with the magnetic core. A recently developed novel synthesis method (electrochemical selective phase dissolution - ESPD), which can produce core-shell magnetic nanoparticles, is reviewed in this paper. ESPD, as the name suggests, uses electro-chemical separation of a phase from metallic alloys to synthesize nanoparticles. It is a versatile method and can be adopted to produce a wide range of nanostructures in addition to the core-shell magnetic nanoparticles.</p>

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confidence: 84%

Section: (A) (B)mentioning

confidence: 99%

Section: Magnetic Properties Of Nanoparticlementioning

confidence: 99%

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confidence: 99%

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