Parak, Wolfgang J.

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orcid::0000-0003-1672-6650
  • Parak, Wolfgang J. (1)
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Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents

Tromsdorf, Ulrich I.; Bigall, Nadja C.; Kaul, Michael G.; Bruns, Oliver T.; Nikolić, Marija; Mollwitz, Birgit; Sperling, Ralph A.; Reimer, Rudolph; Hohenberg, Heinz; Parak, Wolfgang J.; Forster, Stephan; Beisiegel, Ulrike; Adam, Gerhard; Weller, Horst

(Amer Chemical Soc, Washington, 2007)

TY  - JOUR
AU  - Tromsdorf, Ulrich I.
AU  - Bigall, Nadja C.
AU  - Kaul, Michael G.
AU  - Bruns, Oliver T.
AU  - Nikolić, Marija
AU  - Mollwitz, Birgit
AU  - Sperling, Ralph A.
AU  - Reimer, Rudolph
AU  - Hohenberg, Heinz
AU  - Parak, Wolfgang J.
AU  - Forster, Stephan
AU  - Beisiegel, Ulrike
AU  - Adam, Gerhard
AU  - Weller, Horst
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1165
AB  - Superparamagnetic MnFe2O4 nanocrystals of different sizes were synthesized in high-boiling ether solvent and transferred into water using three different approaches. First, we applied a ligand exchange in order to form a water soluble polymer shell. Second, the particles were embedded into an amphiphilic polymer shell. Third, the nanoparticles were embedded into large micelles formed by lipids. Although all approaches lead to effective negative contrast enhancement, we observed significant differences concerning the magnitude of this effect. The transverse relaxivity, in particular r(2)*, is greatly higher for the micellar system compared to the polymer-coated particles using same-sized nanoparticles. We also observed an increase in transverse relaxivities with increasing particle size for the polymer-coated nanocrystals. The results are qualitatively compared with theoretical models describing the dependence of relaxivity on the size of magnetic spheres.
PB  - Amer Chemical Soc, Washington
T2  - Nano Letters
T1  - Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents
EP  - 2427
IS  - 8
SP  - 2422
VL  - 7
DO  - 10.1021/nl071099b
ER  - 
@article{
author = "Tromsdorf, Ulrich I. and Bigall, Nadja C. and Kaul, Michael G. and Bruns, Oliver T. and Nikolić, Marija and Mollwitz, Birgit and Sperling, Ralph A. and Reimer, Rudolph and Hohenberg, Heinz and Parak, Wolfgang J. and Forster, Stephan and Beisiegel, Ulrike and Adam, Gerhard and Weller, Horst",
year = "2007",
abstract = "Superparamagnetic MnFe2O4 nanocrystals of different sizes were synthesized in high-boiling ether solvent and transferred into water using three different approaches. First, we applied a ligand exchange in order to form a water soluble polymer shell. Second, the particles were embedded into an amphiphilic polymer shell. Third, the nanoparticles were embedded into large micelles formed by lipids. Although all approaches lead to effective negative contrast enhancement, we observed significant differences concerning the magnitude of this effect. The transverse relaxivity, in particular r(2)*, is greatly higher for the micellar system compared to the polymer-coated particles using same-sized nanoparticles. We also observed an increase in transverse relaxivities with increasing particle size for the polymer-coated nanocrystals. The results are qualitatively compared with theoretical models describing the dependence of relaxivity on the size of magnetic spheres.",
publisher = "Amer Chemical Soc, Washington",
journal = "Nano Letters",
title = "Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents",
pages = "2427-2422",
number = "8",
volume = "7",
doi = "10.1021/nl071099b"
}
Tromsdorf, U. I., Bigall, N. C., Kaul, M. G., Bruns, O. T., Nikolić, M., Mollwitz, B., Sperling, R. A., Reimer, R., Hohenberg, H., Parak, W. J., Forster, S., Beisiegel, U., Adam, G.,& Weller, H.. (2007). Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents. in Nano Letters
Amer Chemical Soc, Washington., 7(8), 2422-2427.
https://doi.org/10.1021/nl071099b
Tromsdorf UI, Bigall NC, Kaul MG, Bruns OT, Nikolić M, Mollwitz B, Sperling RA, Reimer R, Hohenberg H, Parak WJ, Forster S, Beisiegel U, Adam G, Weller H. Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents. in Nano Letters. 2007;7(8):2422-2427.
doi:10.1021/nl071099b .
Tromsdorf, Ulrich I., Bigall, Nadja C., Kaul, Michael G., Bruns, Oliver T., Nikolić, Marija, Mollwitz, Birgit, Sperling, Ralph A., Reimer, Rudolph, Hohenberg, Heinz, Parak, Wolfgang J., Forster, Stephan, Beisiegel, Ulrike, Adam, Gerhard, Weller, Horst, "Size and surface effects on the MRI relaxivity of manganese ferrite nanoparticle contrast agents" in Nano Letters, 7, no. 8 (2007):2422-2427,
https://doi.org/10.1021/nl071099b . .
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