Unusual variation of blocking temperature in bi-magnetic nanoparticles

Arteaga-Cardona, Fernando; Santillán-Urquiza, Esmeralda; Pal, U.; Mendoza, M.E.; Torres‐Duarte, Cristina; Cherr, Gary N.; Presa, Patricia de la; Méndez‐Rojas, Miguel A.

doi:10.1016/j.jmmm.2017.06.024

Cited by 14 publications

(4 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the surface is strained and broken exchange bonds are induced at the surface, the MgF layer in the interior does not offset the size-related influence of the Znsubstituted MgF surface layer. These changes in T B are due to variations in the Ms value as shown by the MH isotherms (Figure 11) which are contributed by anisotropy due to dipolar interactions or spin-orbit coupling between surface layer atoms [38,39]. The T B of nanoparticles are greatly influenced by the spin-orbit interactions of constituent metal cations and their distribution on the tetrahedral and octahedral positions of nano-ferrites which is influenced by synthesis method [40,41].…”

Section: Low-temperature Magnetic Behaviormentioning

confidence: 99%

Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics

Kumar

Ahmad

Lincoln

et al. 2019

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

Mg-Zn nanocrystalline ferrites (Mg 1−x Zn x Fe 2 O 4 , where x = 0.0 to 1.0) were synthesized by the citrate gel auto-combustion route. XRD revealed the formation of nano-sized particles with cubic spinel structure. Lattice constant and specific surface area increased with Zn substitution. SEM micrographs revealed inhomogeneous grains with agglomerates; EDS spectra confirmed the stoichiometry. HRTEM images showed agglomerated nanoparticles with average particle sizes of 21 nm and 16 nm for x = 0.6 and 1.0, respectively, and lattice fringe images and SAED patterns showed nanocrystalline characteristics corroborating the XRD results. FTIR and Raman spectra recorded at room temperature confirmed the spinel structure of ferrites. VSM technique at room temperature used to measure magnetic properties. M S and H C were found to decrease with increases in the Zn concentration in Mg-Zn ferrites due to a weakening of the A-B interaction and decrease in the particle size and surface effect. Low-temperature magnetic studies were carried out in the ZFC and FC modes using SQUIDS by applying 100 Oe between temperatures of 5 and 400 K, and magnetic isotherms were recorded at temperatures of 51 and 310 K. The study revealed the superparamagnetic nature of the synthesized samples showing that the blocking temperature (T B ) depends on interparticle interactions.

show abstract

Section: Low-temperature Magnetic Behaviormentioning

confidence: 99%

Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics

Kumar

Ahmad

Lincoln

et al. 2019

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

show abstract

“…47 Our group has been exploring the biomedical applications of magnetic nanoparticles as drug carriers, MRI contrast agents and for magnetic hyperthermia. [48][49][50][51][52][53] Most recently our research has focused on exploring alternative biocompatible polymeric coatings for these nanoparticles. 54,55 Here, the preparation and characterization of CMC coated magnetite nanoparticles (Fe 3 -O 4 @CMC) and the evaluation of their performance as drug delivery systems for dopamine are presented.…”

Section: Introductionmentioning

confidence: 99%

Carboxymethyl cellulose coated magnetic nanoparticles transport across a human lung microvascular endothelial cell model of the blood–brain barrier

et al. 2019

View full text Add to dashboard Cite

show abstract

“…There is fundamental interest in the packaging of multiple magnetic nanocrystals in a well-defined host material, along with the accompanying impact on physical properties [ 9 – 13 ]. One appealing option involves high surface area elemental silicon (Si) for this purpose, in the form of porous Si NPs [ 14 , 15 ] or silicon nanotubes (Si NTs) of a well-defined size and uniform structures.…”

Section: Introductionmentioning

confidence: 99%

“…the accompanying impact on physical properties [9][10][11][12][13]. One appealing option involves high surface area elemental silicon (Si) for this purpose, in the form of porous Si NPs [14,15] or silicon nanotubes (Si NTs) of a well-defined size and uniform structures.…”

Section: Introductionmentioning

confidence: 99%

New MRI contrast agents based on silicon nanotubes loaded with superparamagnetic iron oxide nanoparticles

et al. 2018

View full text Add to dashboard Cite

This article describes the preparation and fundamental properties of a new possible material as a magnetic resonance imaging contrast agent based on the incorporation of preformed iron oxide (Fe3O4) nanocrystals into hollow silicon nanotubes (Si NTs). Specifically, superparamagnetic Fe3O4 nanoparticles of two different average sizes (5 nm and 8 nm) were loaded into Si NTs of two different shell thicknesses (40 nm and 70 nm). To achieve proper aqueous solubility, the NTs were functionalized with an outer polyethylene glycol-diacid (600) moiety via an aminopropyl linkage. Relaxometry parameters r1 and r2 were measured, with the corresponding r2/r1 ratios in phosphate buffered saline confirming the expected negative contrast agent behaviour for these materials. For a given nanocrystal size, the observed r2 values are found to be inversely proportional to NT wall thickness, thereby demonstrating the role of nanostructured silicon template on associated relaxometry properties.

show abstract

Unusual variation of blocking temperature in bi-magnetic nanoparticles

Cited by 14 publications

References 53 publications

Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics

Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics

Carboxymethyl cellulose coated magnetic nanoparticles transport across a human lung microvascular endothelial cell model of the blood–brain barrier

New MRI contrast agents based on silicon nanotubes loaded with superparamagnetic iron oxide nanoparticles

Contact Info

Product

Resources

About