Synthesis of nanostructured and hierarchical materials for bio-applications
In recent years, nanostructured materials incorporated with inorganic particles and polymers have attracted attention for simultaneous multifunctional biomedical applications. This thesis summarized three works, which are preparation of mesoporous silica coated superparamagnetic iron oxide (Fe3O4@mS...
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KTH, Funktionella material, FNM
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ndltd-UPSALLA1-oai-DiVA.org-kth-355182013-01-08T13:10:49ZSynthesis of nanostructured and hierarchical materials for bio-applicationsengYe, FeiKTH, Funktionella material, FNMStockholm : KTH Royal Institute of Technology2011Fe3O4mSiO2core-shellMRImultifunctionalPNIPAAmLCSTgoldnanorodnitric acidARMDDCbiocompatibilityimmunomodulationMaterials chemistryMaterialkemiIn recent years, nanostructured materials incorporated with inorganic particles and polymers have attracted attention for simultaneous multifunctional biomedical applications. This thesis summarized three works, which are preparation of mesoporous silica coated superparamagnetic iron oxide (Fe3O4@mSiO2) nanoparticles (NPs) as magnetic resonance imaging T2 contrast agents, polymer grafted Fe3O4@mSiO2 NPs response to temperature change, synthesis and biocompatibility evaluation of high aspect ratio (AR) gold nanorods. Monodisperse Fe3O4@mSiO2 NPs have been prepared through a sol-gel process. The coating thickness and particle sizes can be precisely controlled by varying the synthesis parameters. Impact of surface coatings on magnetometric and relaxometric properties of Fe3O4 NPs is studied. The efficiency of these contrast agents, evaluated by MR relaxivities ratio (r2/r1), is much higher than that of the commercial ones. This coating-thickness dependent relaxation behavior is explained due to the effects of mSiO2 coatings on water exclusion. Multifunctional core-shell composite NPs have been developed by growing thermo-sensitive poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAAm-co-AAm)) on Fe3O4@mSiO2 NPs through free radical polymerization. Their phase transition behavior is studied, and their lower critical solution temperature (LCST) can be subtly tuned from ca. 34 to ca. 42 °C, suitable for further in vivo applications. A seedless surfactant-mediated protocol has been applied for synthesis of high AR gold nanorods with the additive of HNO3. A growth mechanism based on the effect of nitrate ions on surfactant micelle elongation and Ostwald ripening process is proposed. The biocompatibility of high AR nanorods was evaluated on primary human monocyte derived dendritic cells (MDDCs). Their minor effects on viability and immune regulatory markers support further development for medical applications. QC 20110701Licentiate thesis, comprehensive summaryinfo:eu-repo/semantics/masterThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35518urn:isbn:978-91-7415-903-5Trita-ICT/MAP AVH, 1653-7610 ; 2011:4application/pdfinfo:eu-repo/semantics/openAccess |
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English |
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Fe3O4 mSiO2 core-shell MRI multifunctional PNIPAAm LCST gold nanorod nitric acid AR MDDC biocompatibility immunomodulation Materials chemistry Materialkemi |
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Fe3O4 mSiO2 core-shell MRI multifunctional PNIPAAm LCST gold nanorod nitric acid AR MDDC biocompatibility immunomodulation Materials chemistry Materialkemi Ye, Fei Synthesis of nanostructured and hierarchical materials for bio-applications |
description |
In recent years, nanostructured materials incorporated with inorganic particles and polymers have attracted attention for simultaneous multifunctional biomedical applications. This thesis summarized three works, which are preparation of mesoporous silica coated superparamagnetic iron oxide (Fe3O4@mSiO2) nanoparticles (NPs) as magnetic resonance imaging T2 contrast agents, polymer grafted Fe3O4@mSiO2 NPs response to temperature change, synthesis and biocompatibility evaluation of high aspect ratio (AR) gold nanorods. Monodisperse Fe3O4@mSiO2 NPs have been prepared through a sol-gel process. The coating thickness and particle sizes can be precisely controlled by varying the synthesis parameters. Impact of surface coatings on magnetometric and relaxometric properties of Fe3O4 NPs is studied. The efficiency of these contrast agents, evaluated by MR relaxivities ratio (r2/r1), is much higher than that of the commercial ones. This coating-thickness dependent relaxation behavior is explained due to the effects of mSiO2 coatings on water exclusion. Multifunctional core-shell composite NPs have been developed by growing thermo-sensitive poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAAm-co-AAm)) on Fe3O4@mSiO2 NPs through free radical polymerization. Their phase transition behavior is studied, and their lower critical solution temperature (LCST) can be subtly tuned from ca. 34 to ca. 42 °C, suitable for further in vivo applications. A seedless surfactant-mediated protocol has been applied for synthesis of high AR gold nanorods with the additive of HNO3. A growth mechanism based on the effect of nitrate ions on surfactant micelle elongation and Ostwald ripening process is proposed. The biocompatibility of high AR nanorods was evaluated on primary human monocyte derived dendritic cells (MDDCs). Their minor effects on viability and immune regulatory markers support further development for medical applications. === QC 20110701 |
author |
Ye, Fei |
author_facet |
Ye, Fei |
author_sort |
Ye, Fei |
title |
Synthesis of nanostructured and hierarchical materials for bio-applications |
title_short |
Synthesis of nanostructured and hierarchical materials for bio-applications |
title_full |
Synthesis of nanostructured and hierarchical materials for bio-applications |
title_fullStr |
Synthesis of nanostructured and hierarchical materials for bio-applications |
title_full_unstemmed |
Synthesis of nanostructured and hierarchical materials for bio-applications |
title_sort |
synthesis of nanostructured and hierarchical materials for bio-applications |
publisher |
KTH, Funktionella material, FNM |
publishDate |
2011 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35518 http://nbn-resolving.de/urn:isbn:978-91-7415-903-5 |
work_keys_str_mv |
AT yefei synthesisofnanostructuredandhierarchicalmaterialsforbioapplications |
_version_ |
1716511019763761152 |