Journal
ACS NANO
Volume 4, Issue 9, Pages 5339-5349Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101129r
Keywords
iron oxide nanoparticles; silica coating; NMR relaxation rates; MRI contrast agents
Categories
Funding
- Fundacao para a Ciencia e Tecnologia (FCT), Portugal [SFRH/BD/38313/2007, SFRH/BPD/35005/2007, PTDC/CTM/73243/2006]
- CNRS France
- Region Aquitaine France
- FEDER
- COST Action D38
- European Network of Excellence FAME
- Fundação para a Ciência e a Tecnologia [SFRH/BD/38313/2007, PTDC/CTM/73243/2006, SFRH/BPD/35005/2007] Funding Source: FCT
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We report the fine-tuning of the relaxometry of gamma-Fe2O3@SiO2 core-shell nanoparticles by adjusting the thickness of the coated silica layer. It is clear that the coating thickness of gamma Fe2O3@SiO2 nanoparticles has a significant impact on the r(1) (at low B-0 fields), r(2), and r(2)* relaxivities of their aqueous suspensions. These studies clearly indicate that the silica layer is heterogeneous and has regions that are porous to water and others that are not. It is also shown, that the viability and the mitochondrial dehydrogenase expression of the microglial cells do not appear to be sensitive to the vesicular load with these core shell nanoparticles. The adequate silica shell thickness can therefore be tuned to allow for both a sufficiently high response as contrast agent, and adequate grafting of targeted biomolecules.
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