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Pregled bibliografske jedinice broj: 654761

Composition and morphology investigation of NiCoB nanoparticles, as-prepared and coated by SiO2


Lončarek, Ivana; Tonejc, Anđelka; Skoko, Željko; Novosel, Nikolina; Mustapić, Mislav; Zadro, Krešo
Composition and morphology investigation of NiCoB nanoparticles, as-prepared and coated by SiO2 // Croatica chemica acta, 86 (2013), 3; 297-307 (međunarodna recenzija, članak, znanstveni)


Naslov
Composition and morphology investigation of NiCoB nanoparticles, as-prepared and coated by SiO2

Autori
Lončarek, Ivana ; Tonejc, Anđelka ; Skoko, Željko ; Novosel, Nikolina ; Mustapić, Mislav ; Zadro, Krešo

Izvornik
Croatica chemica acta (0011-1643) 86 (2013), 3; 297-307

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Amorphous NiCoB nanoparticles; X-ray diffraction; rietveld refinement; scanning electron microscopy (SEM); energy dispersive X-ray analysis (EDS)
(Amorphous NiCoB nanoparticles; X-ray diffraction; rietveld refinement; scanning electron microscopy (SEM); energy dispersive X-ray analysis (EDS)

Sažetak
Magnetic nanoparticles have attracted much interest recently due to their novel properties and versatile applications (e.g. in biomedicine1- 3, microelectromechanical / nanoelectromechanical (MEMS/NEMS) devices4, giant magnetoresistance (GMR) sensors5 etc.). The point essential for the study of fine particles is the production of samples of narrow and reproducible size distribution. A well known method for preparation of alloys in the form of fine particles (particularly ternary transition metal-boron alloys) is the chemical reduction of aqueous solution of metal salts, with alkali metal borohydride as the reducing agent6-8. It has been shown that the amount of boron strongly affects the magnetic behaviour of such alloys (as it alters the band structure and Fermi density of states)9. Alloys chemically reduced by alkali metal borohydride have nanosized morphology and consequently higher surface area and activity than those prepared by some physical methods (for example, rapid melt quenching method by which alloys are produced in form of thin ribbons10-12) and can be amorphous13-15 or amorphous/crystalline16, 17. By systematically adjusting various parameters – time, temperature, concentration and chemistry of starting materials, surfactants and solvents – it is possible to control the morphology (i.e. size and shape) and therefore the properties of nanoparticles. The aim of this investigation was to obtain nanosized particles with well defined dimensions (10-30 nm) and relatively narrow size distribution using chemical reduction synthesis. Silica shell was used in order to stabilize the nanoparticles (e.g. to reduce oxidation of the core, to control the distance between the particles thus reducing their magnetic interaction, previously reported on example of Co-Ni based nanoparticles18). The resulting microstructures were examined by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS).

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
119-0982886-1009 - Struktura i svojstva posebnih nanomaterijala dobivenih suvremenim tehnikama (Antun Tonejc, )
119-1191458-1017 - Nanomagneti (Krešo Zadro, )
119-1191458-1019 - Elektromagnetska svojstva nanostrukturiranih materijala (Emil Babić, )

Ustanove
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus