| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Saunders, Martin
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (33/33 displayed)
- 2024The Synergistic Effect of High Intensity Focused Ultrasound on In-vitro Remineralization of Tooth Enamel by Calcium Phosphate Ion Clusterscitations
- 2023Understanding the effect of microstructural texture on the anisotropic elastic properties of selective laser melted Ti-24Nb-4Zr-8Sncitations
- 2021Cr2O3 in corundumcitations
- 2021Poly(2-hydroxyethyl methacrylate) hydrogels doped with copper nanoparticlescitations
- 2020Kishonite, VH2, and Oreillyite, Cr2N, two new minerals from the corundum xenocrysts of Mt Carmel, Northern Israelcitations
- 2020Dendronised Polymers as Templates for In Situ Quantum Dot Synthesis
- 2019Interrogation of the Effect of Polymorphism of a Metal-Organic Framework Host on the Structure of Embedded Pd Guest Nanoparticlescitations
- 2019Chromium in Corundum: Ultra-high Contents Under Reducing Conditions
- 2018Nanogeochemistry of hydrothermal magnetitecitations
- 2018NiO–ZnO Nanoheterojunction Networks for Room-Temperature Volatile Organic Compounds Sensingcitations
- 2018Carmeltazite, ZrAl2Ti4O11, a new mineral trapped in corundum from volcanic rocks of Mt Carmel, Northern Israelcitations
- 2018Remarkably preserved tephra from the 3430 Ma Strelley Pool Formation, Western Australiacitations
- 2018Generation of amorphous carbon and crystallographic texture during low-temperature subseismic slip in calcite fault gougecitations
- 2017Crystallography of refractory metal nuggets in carbonaceous chondritescitations
- 2017Critical testing of potential cellular structures within microtubes in 145 Ma volcanic glass from the Argo Abyssal Plaincitations
- 2017Crystallography of refractory metal nuggets in carbonaceous chondrites: a transmission Kikuchi diffraction approachcitations
- 2016Preparation and characterization of cerium substituted bismuth dysprosium iron garnets for magneto-optic applicationscitations
- 20163.46 Ga Apex chert ‘microfossils’ reinterpreted as mineral artefacts produced during phyllosilicate exfoliationcitations
- 2015No evidence for intracellular magnetite in putative vertebrate magnetoreceptors identified by magnetic screeningcitations
- 2015Barium titanate nanoparticles for biomarker applicationscitations
- 2014The nano-scale anatomy of a complex carbon-lined microtube in volcanic glass from the ~92Ma Troodos Ophiolite, Cypruscitations
- 2011Microstructural analysis of interfaces in a ferromagnetic- multiferroic epitaxial heterostructurecitations
- 2009Characterization of biominerals in the radula teeth of the chiton, Acanthopleura hirtosacitations
- 2009Elemental ultrastructure of bioleaching bacteria and archaea grown on different energy sourcescitations
- 2009Dietary iron-loaded rat liver haemosiderin and ferritin : in situ measurement of iron core nanoparticle size and cluster structure using anomalous small-angle x-ray scatteringcitations
- 2007Er2O3 as a high-K dielectric candidatecitations
- 2006Structural and Magnetic Properties of Oxidatively Stable Cobalt Nanoparticles Encapsulated in Graphite Shellscitations
- 2006Effect of oxidation on the chemical bonding structure of PECVD SiN thin filmscitations
- 2006Magnesium oxide as a candidate high-k gate dielectriccitations
- 2005ZrO2 film interfaces with Si and SiO2citations
- 2003Study of interface formation of (Ba,Sr)TiO3 thin films grown by rf sputter deposition on bare Si and thermal SiO2/Si substrates
- 2003Magnetite nanoparticle dispersions stabilized with triblock copolymerscitations
- 2002Study of interface formation of (Ba,Sr)TiO3 thin films grown by rf sputter deposition on bare Si and thermal SiO2/Si substrates
Places of action
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article
Magnetite nanoparticle dispersions stabilized with triblock copolymers
Abstract
Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility are of great interest for medical applications. Magnetite nanoparticles display strong ferrimagnetic behavior and are less sensitive to oxidation than magnetic transition metal nanoparticles such as cobalt, iron, and nickel. For in vivo applications, well-defined organic coatings are needed to surround the magnetite nanoparticles and prevent any aggregation. The goal of this research was to develop complexes of magnetite nanoparticles coated with well-defined hydrophilic polymers so that they could be dispersed in aqueous fluids. Focal points have included the following: (1) Investigations of polymer systems that bind irreversibly to magnetite at the physiological pH, (2) the design of block copolymers with anchor and tail blocks to enable dispersion in biological fluids, and (3) investigations of copolymer block lengths to maximize the concentration of bound magnetite. Hydrophilic triblock copolymers with controlled concentrations of pendent carboxylic acid binding groups were designed as steric stabilizers for magnetite nanoparticles. These copolymers were comprised of controlled molecular weight poly(ethylene oxide) tail blocks and a central, polyurethane anchor block containing carboxylic acids. Stoichiometric aqueous solutions of FeCl2 and FeCl3 were condensed by reaction with NH4OH to form magnetite nanoparticles, and then a dichloromethane solution of the block copolymer was added to adsorb the copolymer onto the magnetite surfaces. Stable magnetite dispersions were prepared with all of the triblock copolymers. The polymer-nanomagnetite conjugates described in this paper had a maximum saturation magnetization of 34 emu/g. Magnetization curves showed minimal hysteresis. Powder X-ray diffraction (XRD), selected area electron diffraction (SAED), and high-resolution electron microscopy (HREM) confirmed the magnetite crystal structure. Transmission electron microscopy (TEM) showed that the dispersions contained magnetite particles coated with the polymers with a mean diameter of 8.8 +/- S.D. 2.7 nm.