Iron oxide (e.g., Fe3O4 or γ-Fe2O3) nanoparticles are promising candidates for a variety of biomedical applications ranging from magnetic hyperthermia therapy to drug delivery and biodetection due their superparamagnetism, nontoxicity, biodegradability. While particles small size (below critical size, ∼20 nm) display superparamagnetic behavior at room temperature, these tend penetrate highly sensitive areas the body such as blood–brain barrier, leading undesired effects. In addition, possess...

The use of magnetic nanoparticles in the treatment cancer using alternating current hyperthermia therapy has shown potential to replace or supplement conventional treatments, radiotherapy and chemotherapy, which have severe side effects. Though nearly spherical sub-10 nm iron oxide their approval from US Food Drug Administration, low heating efficiency removal body after raises serious concerns. majority research is working create nanomaterials with improved long blood circulation time....

Magnetic nanoparticles are extensively utilized as markers/signal labelling in various biomedical applications. Detecting and distinguishing magnetic signals from similarly sized moving microfluidic systems is crucial yet challenging for biosensing. In this study, we have developed an original method to detect differentiate superparamagnetic (SPM) ferrimagnetic (FM) of comparable sizes. Our approach utilizes a highly sensitive magnetic-coil-based sensor that harnesses the combined effects...

Nickel-zinc ferrite (NZF) compounds, renowned for their mixed spinel structures, hold significant promise diverse applications in high-frequency devices and biomedicine. This study utilizes solvothermal synthesis to produce NZF nanoparticles (NPs) with tunable diameters ranging from 40 300 nm. These NPs exhibit polycrystalline crystallite sizes tailored be approximately 8 nm, a pivotal factor preserving superparamagnetic (SPM) properties across broad size spectrum. A combination of scanning...

The inherent existence of multi phases in iron oxide nanostructures highlights the significance them being investigated deliberately to understand and possibly control phases. Here, effects annealing at 250 °C with a variable duration on bulk magnetic structural properties high aspect ratio biphase nanorods ferrimagnetic Fe3O4 antiferromagnetic α-Fe2O3 are explored. Increasing time under free flow oxygen enhanced volume fraction improved crystallinity phase, identified changes magnetization...

We report a systematic investigation of the magnetic properties including exchange bias (EB) effect in an iron oxide nanocube system with tunable phase and average size (10, 15, 24, 34, 43 nm). X-ray diffraction Raman spectroscopy reveal presence Fe3O4, FeO, andα-Fe2O3phases nanocubes, which volume fraction each varies depending upon particle size. While Fe3O4phase is dominant all tends to grow increasing size, FeO appears coexist 10, 24 nm nanocubes but disappears 34 nanocubes. The exposed...

Ionic engineering is exploited to substitute Bi cations in BiFe0.95Mn0.05O3 NPs (BFM) with rare-earth (RE) elements (Nd, Gd, and Dy). The sol-gel synthesized RE-NPs are tested for their magnetic hyperthermia potential. RE-dopants alter the morphology of BFM from elliptical rectangular irregular hexagonal Nd, Dy doping, respectively. RE-BFM ferroelectric show larger piezoresponse than pristine BFO NPs. There an increase maximum magnetization at 300 K up 550% by introducing Gd. In tests, 3...

Abstract Aiming to obtain hybrid magneto-plasmonic nanostructures, we have developed multisegmented and core/shell structured Fe–Au nanorods using template assisted electrochemical deposition. A facile method of tuning the growth pattern into is demonstrated. With a precise control current density deposition time, brick-stacked wire like led formation hollow nanotubes that could be further tuned multilayered nanorods. TEM imaging STEM-EELS technique were used explore morphology,...

We report on the effects of annealing temperatures ranging from 225 °C to 325 magnetic properties high aspect ratio iron oxide nanorods consisting a ferrimagnetic Fe3O4 phase and an antiferromagnetic α-Fe2O3 in as-prepared state. Annealing at aforementioned under constant flow O2 for 3 h leads increment volume fraction concomitant enhancement crystallinity phase. These opposing compete with each other, resulting decrease global magnetization increasing temperature. The desirable are achieved...

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Tailoring the magnetic properties of iron oxide nanosystems is essential to expanding their biomedical applications. In this study, 34 nm nanocubes with two phases consisting Fe3O4 and α-Fe2O3 were annealed for 2 h in presence O2, N2, He, Ar tune respective phase volume fractions control properties. X-ray diffraction measurements carried out post-treatment evaluate changes treated samples compared as-prepared samples, showing an enhancement O2 while others indicated a enhancement....

We report on the magnetic properties of biphase iron oxide nanorods (NRs) consisting ferrimagnetic Fe3O4 and antiferromagnetic α-Fe2O3 phases. Annealing as-prepared NRs at 250 °C for 5h, significantly improved crystallinity phase enhanced volume fraction phase. Magnetometry data consistently reveal these two magnetically distinct phases, which are not in proximity to each other but separated by a region disordered spins giving rise magnetization low temperatures when sample was cooled down...

Tailoring the magnetic properties of iron oxide nanosystems is essential to expand their biomedical applications. In this study, 34 nm nanocubes with two phases consisting Fe3O4 and alpha-Fe2O3 were annealed for 2 hours in presence O2, N2, He, Ar tune respective phase volume fractions control properties. X-ray diffraction measurements carried out post-treatment evaluate changes treated samples compared as-prepared, which showed an enhancement while others indicated enhancement. Furthermore,...

Iron oxide (e.g., Fe$_3$O$_4$ or Fe$_2$O$_3$) nanoparticles are promising candidates for a variety of biomedical applications ranging from magnetic hyperthermia therapy to drug delivery and bio-detection, due their superparamagnetism, non-toxicity, biodegradability. While particles small size (below critical size, ~20 nm) display superparamagnetic behavior at room temperature, these tend penetrate highly sensitive areas the body such as Blood-Brain Barrier (BBB), leading undesired effects....

The inherent existence of multi phases in iron oxide nanostructures highlights the significance them being investigated deliberately to understand and possibly control phases. Here, effects annealing at 250 0C with a variable duration on bulk magnetic structural properties high aspect ratio bi-phase nanorods ferrimagnetic Fe3O4 antiferromagnetic alpha-Fe2O3 is explored. Increasing time under free flow oxygen enhanced volume fraction, improved crystallinity phase, identified changes...