Surfactant free superparamagnetic iron oxide nanoparticles for stable ferrofluids in physiological solutions

Mandel, Karl; Straßer, Marion; Granath, Tim; Dembski, Sofia; Sextl, Gerhard

doi:10.1039/c4cc09277e

Cited by 41 publications

(39 citation statements)

References 36 publications

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“…Thus, it can only be stated that hints were found that the zeta potential of the supraparticle system seems to behave as expected from a mix of the two nanoparticle constituents. This is likely and could be demonstrated on a single particle level in case of an iron oxide nanoparticle core with silica patches by us recently, i. e ., there, it was shown that the zeta potential versus pH curve of the iron oxide core @ silica patches system was somewhat in‐between the curves of pure iron oxide and pure silica, correlating to the fractions of the two constituents …”

Section: Resultsmentioning

confidence: 99%

“…Compared to other adsorber systems reported in literature, the specific surface area is about average. [15][16][17][18][19] Adsorbers with higher surface area such as 1380 m 2 /g and 2134 m 2 /g were reported as well. [6,5] Yet, the approach reported herein comes with all the flexibility to build a system of desired composition, e. g. in terms of silica nanoparticle amount and size and magnetic nanoparticle content, in a completely flexible, "Lego building block like" manner (compare Scheme 1).…”

Section: Resultsmentioning

confidence: 99%

“…Synthesis of stable iron oxide nanoparticle containing ferrofluid : The synthesis of the ferrofluid (FF) is based on a published procedure ,. For the precipitation of the zinc doped iron oxide nanoparticles (zinc doping was conducted to improve the magnetic properties), FeCl 3 ⋅ 6H 2 O (6.8 mmol), FeCl 2 ⋅ 4H 2 O (4.0 mmol) and ZnCl 2 (1.2 mmol) were dissolved in deionized water (H 2 O, 50 mL).…”

Section: Methodsmentioning

confidence: 99%

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Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

et al. 2018

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Herein, a particle system of so‐called raspberry‐like supraparticles, capable of dye removal from water within a few seconds, is presented. These particles are micron sized and assembled of smaller silica nanoparticles as adsorber and iron oxide nanoparticles which act, due to their superparamagnetic properties, as switchable magnets. With this particle design, it is possible to tailor the adsorber structure and adjust the magnetic properties. Using very small silica nanoparticles (10 nm) combined with superparamagnetic iron oxide nanoparticles (10 nm) to build the supraparticles resulted in a system which could clarify a deeply methylene blue dye colored water within 60 seconds via dye adsorption on the particles and their subsequent magnetic separation. A comparison with assembled supraparticles from larger primary nanoparticles revealed the role of the primary nanoparticles to create a porous particle structure which comes with an apparent capillary effect to take up the dye. The system could be regenerated either thermally or by acid treatment and reused consecutively as magnetically recoverable adsorber. Due to the building block principle of the system, modification towards other adsorption tasks should be easily possible. This therefore turns such particle systems into an ideal platform to build tailored adsorbers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

et al. 2018

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“…1,2 In addition, Fe 3 O 4 magnetic nanoparticles (MNPs) have shown promising application as materials of interest for ferrofluids, 3,4 hyperthermia, 5 magnetic resonance imaging (MRI), 6,7 high-density information storage, 8 and targeted drug delivery labeling. 9 A variety of methodologies including coprecipitation, sol-gel method, thermal decomposition, microemulsion and hydrothermal synthesis have been reported for the synthesis of Fe 3 O 4 MNPs, and further advancement in the synthesis of such materials is still on-going due to their outstanding potential in variety of applications.…”

Section: Introductionmentioning

confidence: 99%

Single step synthesis, characterization and applications of curcumin functionalized iron oxide magnetic nanoparticles

Bhandari

Gupta

Dziubla

et al. 2016

Materials Science and Engineering: C

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Magnetic iron oxide nanoparticles have been well known for their applications in magnetic resonance imaging (MRI), hyperthermia, targeted drug delivery, etc. The surface modification of these magnetic nanoparticles has been explored extensively to achieve functionalized materials with potential application in biomedical, environmental and catalysis field. Herein, we report a novel and versatile single step methodology for developing curcumin functionalized magnetic Fe3O4 nanoparticles without any additional linkers, using a simple coprecipitation technique. The magnetic nanoparticles (MNPs) were characterized using transmission electron microscopy, x-ray diffraction, fourier transform infrared spectroscopy and thermogravimetric analysis. The developed MNPs were employed in a cellular application for protection against an inflammatory agent, a polychlorinated biphenyl (PCB) molecule.

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“…Our preferred particle materials are inorganic and hybrid materials, e.g. materials based on silicate, calcium fluoride and phosphate, TiO2 and iron oxide [1,2]. To ensure multifunctionality, different approaches are taken: the labelling of the NP matrix with organic dyes or lanthanide ions, as well as the combination of various materials by core-shell NP design.…”

mentioning

confidence: 99%

Multifunctional Nanoparticles for Medical Applications

Dembski¹,

Schneider²,

Straßer³

et al. 2017

Proceedings of the 2nd World Congress on Recent Advances in Nanotechnology

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Extended AbstractWell-tailored multifunctional nanoparticles (NPs), which are in the focus of our R&D work, play a major role in the development of future-oriented, advanced functional materials for life science applications such as in contrast agents for medical imaging, for in vitro and in vivo diagnostics, in drug delivery as well as in tissue engineering. Inorganic-organic biohybrid NPs in particular are considered to be important for the development of smart materials and novel technologies for medical applications.We prepare our NPs by wet-chemical methods: sol-gel, precipitation or hydrothermal synthesis. Our preferred particle materials are inorganic and hybrid materials, e.g. materials based on silicate, calcium fluoride and phosphate, TiO2 and iron oxide [1,2]. To ensure multifunctionality, different approaches are taken: the labelling of the NP matrix with organic dyes or lanthanide ions, as well as the combination of various materials by core-shell NP design. Typical core materials are iron oxide or amorphous silica, typical shell materials are pure silica, organic dye doped silica, Zn2SiO4:Mn2+, Ca10(PO4)6OH:Eu3+, or CaF2:Eu3+ [3,4]. The structure, size, and composition of these NPs can easily be controlled to tailor their chemical and physical properties. The influence of the composition and structure of the NP is studied by optical absorption and photoluminescence spectroscopy. Characterization is done by conventional methods such as dynamic light scattering (DLS), transmission electron microscopy (TEM), or X-ray diffraction analysis (XRD). The resulting NPs are subsequently modified with various chemical functionalities such as amine and carboxyl functions using conventional functionalization methods such as silanization. Furthermore, surface modified NPs are covalently attached to biological moieties, e.g. antibodies, nucleobases, or peptides, by means of standard bioconjugation methods [5].The great potential of novel NPs as assay labels for immunodetection, contrast agents for medical imaging or tools for tumor therapy has been demonstrated in different research projects [6].In close collaboration with the Fraunhofer translational center "Regenerative therapies in oncology and musculoskeletal diseases", a special application of NPs for in vitro and in vivo monitoring of wound healing process is investigated. To this end, artificial wound models, which help to increase the effectiveness of a medication by testing it in an earlier stage to significantly reduce the number of medications selected for clinical tests, have been developed. In general, the 3D tissue models can be used as a preliminary stage to animal experiments for investigations of functional parameters like the distribution and metabolization of substances in different tissue layers.The demographic change in the industrialized countries manifests itself in a constantly growing number of humans in need of care and, at the same time, a declining number of available care forces. This effect is strengthened by the fact that cost-intens...

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Surfactant free superparamagnetic iron oxide nanoparticles for stable ferrofluids in physiological solutions

Cited by 41 publications

References 36 publications

Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

Reusable Superparamagnetic Raspberry‐Like Supraparticle Adsorbers as Instant Cleaning Agents for Ultrafast Dye Removal from Water

Single step synthesis, characterization and applications of curcumin functionalized iron oxide magnetic nanoparticles

Multifunctional Nanoparticles for Medical Applications

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