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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.


Related in: MedlinePlus

Data extracted from the ACS versus temperature measurements for samples A and B. Data have been fitted using straight lines.
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ijms-16-19752-f008: Data extracted from the ACS versus temperature measurements for samples A and B. Data have been fitted using straight lines.

Mentions: Figure 8 shows data extracted from the ACS versus temperature measurements. The data points have been fitted to a straight line equation yielding τ0 in the order of 10−15 s for both samples, indicating some interparticle interactions. By using a diameter of 8.7 nm for Sample A and 9.4 nm for Sample B we obtain rather large anisotropy constants of 90 and 62 kJ/m3 respectively. These values are higher than bulk values for both magnetite and maghemite, indicating an anisotropy contribution from e.g., the large surface/volume ratio. These “unphysical” values of τ0 and Kcp are a clear sign of inter-particle interactions.


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)

Data extracted from the ACS versus temperature measurements for samples A and B. Data have been fitted using straight lines.
© Copyright Policy
Related In: Results  -  Collection

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

ijms-16-19752-f008: Data extracted from the ACS versus temperature measurements for samples A and B. Data have been fitted using straight lines.
Mentions: Figure 8 shows data extracted from the ACS versus temperature measurements. The data points have been fitted to a straight line equation yielding τ0 in the order of 10−15 s for both samples, indicating some interparticle interactions. By using a diameter of 8.7 nm for Sample A and 9.4 nm for Sample B we obtain rather large anisotropy constants of 90 and 62 kJ/m3 respectively. These values are higher than bulk values for both magnetite and maghemite, indicating an anisotropy contribution from e.g., the large surface/volume ratio. These “unphysical” values of τ0 and Kcp are a clear sign of inter-particle interactions.

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