Effects of biocompatible coating of nanoparticles on acoustics property of the magnetic fluid

Józefczak, Arkadiusz; Skumiel, A.; Łabowski, M.

doi:10.1016/j.jmmm.2004.11.467

Cited by 13 publications

(10 citation statements)

References 15 publications

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“…The maximum changes in the ultrasonic wave attenuation for MF are caused by the resonant absorption of the ultrasonic wave by spherical clusters of magnetic particles (mean radius 230 nm) (see Ref. [11]). The magnetic field has little effect on dextran stabilized magnetic fluid structure.…”

Section: Article In Pressmentioning

confidence: 99%

Study of heating effect and acoustic properties of dextran stabilized magnetic fluid

Józefczak

Skumiel

2007

Journal of Magnetism and Magnetic Materials

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Section: Article In Pressmentioning

confidence: 99%

Study of heating effect and acoustic properties of dextran stabilized magnetic fluid

Józefczak

Skumiel

2007

Journal of Magnetism and Magnetic Materials

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“…Figure 3 shows changes in the ultrasound wave absorption coefficient α as a function of the magnetic field intensity at different temperatures. The immobilization of dextran results in a greater stability of the ferrofluid structure; changes in the absorption coefficient are many times smaller than in a water-based magnetic fluid stabilized only by sodium oleate [6]. On the basis of magnetic experiments, an average radius r m = 5.6 nm of the magnetic cores of composite particles was determined.…”

Section: Resultsmentioning

confidence: 99%

Heating Effect in Biocompatible Magnetic Fluid

et al. 2007

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This work is devoted to the study of heating of a biocompatible magnetic fluid due to time-varying magnetic induction. The adsorption of dextran on magnetite particles was confirmed by IR spectroscopy. A considerable thickness of the surfactant layer (oleate sodium + dextran) of about 4.3 nm prevents the formation of clusters made of nanomagnetic particles as evidenced by the fact that no maxima of the ultrasound wave absorption coefficient corresponding to cluster formation have been detected. The results show that the observed heating effect may be applied in hyperthermia treatments especially in the preferable region of 500 -800 kHz. An "H 2 -law" observed for the dependence of the SAR on the square of the amplitude of the magnetic field demonstrates the presence of superparamagnetic particles in the ferrofluid.

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“…Magnetic fluids are stable colloidal systems consisting of single-domain ferroferrimagnetic particles coated with a surfactant and dispersed in a carrier liquid. The biocompatible ferrofluids can be used as systems for anticancer agent released in the local region of the tumor and in magnetic hyperthermia treatment (Józefczak et al 2005, Marin 2006, Wu et al 2007.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic materials can be coated using biocompatible inorganic materials (Deb et al 2003, Arcos et al 2002, Ebisawa et al 1997, Gross et al 2002, Bretcanu et al 2005 or polymers (Józefczak et al 2005, Park et al 2005, Gomez-Lopera et al 2001, Donadel et al 2008, Dutz et al 2007, Okassa et al 2005. Amongst the biocompatible materials used as coverings, bioceramic hydroxyapatite (HAp) has been used due to its known biocompatibility, non-toxicity and bioactivity.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of hydroxyapatite-coated iron oxide particles by spray-drying technique

Donadel

Felisberto

Laranjeira

2009

An. Acad. Bras. Ciênc.

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Magnetic particles of iron oxide have been increasingly used in medical diagnosis by magnetic resonance imaging and in cancer therapies involving targeted drug delivery and magnetic hyperthermia. In this study we report the preparation and characterization of iron oxide particles coated with bioceramic hydroxyapatite by spray-drying. The iron oxide magnetic particles (IOMP) were coated with hydroxyapatite (HAp) by spray-drying using two IOMP/HAp ratios (0.7 and 3.2). The magnetic particles were characterized by way of scanning electronic microscopy, energy dispersive X-ray, X-ray diffraction, Fourier transformed infrared spectroscopy, flame atomic absorption spectrometry, vibrating sample magnetometry and particle size distribution (laser diffraction). The surface morphology of the coated samples is different from that of the iron oxide due to formation of hydroxyapatite coating. From an EDX analysis, it was verified that the surface of the coated magnetic particles is composed only of HAp, while the interior contains iron oxide and a few layers of HAp as expected. The results showed that spray-drying technique is an efficient and relatively inexpensive method for forming spherical particles with a core/shell structure.

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Effects of biocompatible coating of nanoparticles on acoustics property of the magnetic fluid

Cited by 13 publications

References 15 publications

Study of heating effect and acoustic properties of dextran stabilized magnetic fluid

Study of heating effect and acoustic properties of dextran stabilized magnetic fluid

Heating Effect in Biocompatible Magnetic Fluid

Preparation and characterization of hydroxyapatite-coated iron oxide particles by spray-drying technique

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