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Polymer/Iron Oxide Nanoparticle Composites--A Straight Forward and Scalable Synthesis Approach.

Sommertune J, Sugunan A, Ahniyaz A, Bejhed RS, Sarwe A, Johansson C, Balceris C, Ludwig F, Posth O, Fornara A - Int J Mol Sci (2015)

Bottom Line: Multi-core particles were obtained within the Z-average size range of 130 to 340 nm.With the aim to combine the fast room temperature magnetic relaxation of small individual cores with high magnetization of the ensemble of SPIONs, we used small (<10 nm) core nanoparticles.The performed synthesis is highly flexible with respect to the choice of polymer and SPION loading and gives rise to multi-core particles with interesting magnetic properties and magnetic resonance imaging (MRI) contrast efficacy.

View Article: PubMed Central - PubMed

Affiliation: SP, Technical Research Institute of Sweden, Box 5607, SE-114 86 Stockholm, Sweden. jens.sommertune@sp.se.

ABSTRACT
Magnetic nanoparticle systems can be divided into single-core nanoparticles (with only one magnetic core per particle) and magnetic multi-core nanoparticles (with several magnetic cores per particle). Here, we report multi-core nanoparticle synthesis based on a controlled precipitation process within a well-defined oil in water emulsion to trap the superparamagnetic iron oxide nanoparticles (SPION) in a range of polymer matrices of choice, such as poly(styrene), poly(lactid acid), poly(methyl methacrylate), and poly(caprolactone). Multi-core particles were obtained within the Z-average size range of 130 to 340 nm. With the aim to combine the fast room temperature magnetic relaxation of small individual cores with high magnetization of the ensemble of SPIONs, we used small (<10 nm) core nanoparticles. The performed synthesis is highly flexible with respect to the choice of polymer and SPION loading and gives rise to multi-core particles with interesting magnetic properties and magnetic resonance imaging (MRI) contrast efficacy.

No MeSH data available.


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DC magnetization versus applied field for samples A and B.
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ijms-16-19752-f006: DC magnetization versus applied field for samples A and B.

Mentions: Firstly, we tested the DC-magnetization versus field of Samples A and B at 300 K (see Figure 6). We could not observe any hysteresis in both the samples. The intrinsic saturation magnetization is 103 Am2/kgFe for Sample A and 98 Am2/kgFe for Sample B. This corresponds to 75 and 71 Am2/kg respectively for the iron oxide nanoparticles, assuming magnetite phase. The small variation in intrinsic saturation magnetization is probably due to batch to batch variation during core synthesis. Background magnetic moments due to the sample cup and water content have been removed.


Polymer/Iron Oxide Nanoparticle Composites--A Straight Forward and Scalable Synthesis Approach.

Sommertune J, Sugunan A, Ahniyaz A, Bejhed RS, Sarwe A, Johansson C, Balceris C, Ludwig F, Posth O, Fornara A - Int J Mol Sci (2015)

DC magnetization versus applied field for samples A and B.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4581323&req=5

ijms-16-19752-f006: DC magnetization versus applied field for samples A and B.
Mentions: Firstly, we tested the DC-magnetization versus field of Samples A and B at 300 K (see Figure 6). We could not observe any hysteresis in both the samples. The intrinsic saturation magnetization is 103 Am2/kgFe for Sample A and 98 Am2/kgFe for Sample B. This corresponds to 75 and 71 Am2/kg respectively for the iron oxide nanoparticles, assuming magnetite phase. The small variation in intrinsic saturation magnetization is probably due to batch to batch variation during core synthesis. Background magnetic moments due to the sample cup and water content have been removed.

Bottom Line: Multi-core particles were obtained within the Z-average size range of 130 to 340 nm.With the aim to combine the fast room temperature magnetic relaxation of small individual cores with high magnetization of the ensemble of SPIONs, we used small (<10 nm) core nanoparticles.The performed synthesis is highly flexible with respect to the choice of polymer and SPION loading and gives rise to multi-core particles with interesting magnetic properties and magnetic resonance imaging (MRI) contrast efficacy.

View Article: PubMed Central - PubMed

Affiliation: SP, Technical Research Institute of Sweden, Box 5607, SE-114 86 Stockholm, Sweden. jens.sommertune@sp.se.

ABSTRACT
Magnetic nanoparticle systems can be divided into single-core nanoparticles (with only one magnetic core per particle) and magnetic multi-core nanoparticles (with several magnetic cores per particle). Here, we report multi-core nanoparticle synthesis based on a controlled precipitation process within a well-defined oil in water emulsion to trap the superparamagnetic iron oxide nanoparticles (SPION) in a range of polymer matrices of choice, such as poly(styrene), poly(lactid acid), poly(methyl methacrylate), and poly(caprolactone). Multi-core particles were obtained within the Z-average size range of 130 to 340 nm. With the aim to combine the fast room temperature magnetic relaxation of small individual cores with high magnetization of the ensemble of SPIONs, we used small (<10 nm) core nanoparticles. The performed synthesis is highly flexible with respect to the choice of polymer and SPION loading and gives rise to multi-core particles with interesting magnetic properties and magnetic resonance imaging (MRI) contrast efficacy.

No MeSH data available.


Related in: MedlinePlus