Direct Coprecipitation Route to Monodisperse Dual‐Functionalized Magnetic Iron Oxide Nanocrystals Without Size Selection

Li, Zhen; Tan, Bien; Allix, Mathieu; Cooper, Andrew I.; Rosseinsky, Matthew J.

doi:10.1002/smll.200700575

Cited by 139 publications

(120 citation statements)

References 40 publications

(60 reference statements)

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“…The TiO 2 {001} nanosheets and poly(methacrylic acid) polymer ligands were synthesized according to the literatures 29,30 . For PtO/ TiO 2 photocatalyst, 50 mg of TiO 2 and 24.6 mg of polymer ligands were added into a screw-neck glass bottle (10 ml) containing chloroplatinic acid solution (5 ml, 0.2 mg ml À 1 ).…”

Section: Methodsmentioning

confidence: 99%

Unidirectional suppression of hydrogen oxidation on oxidized platinum clusters

et al. 2013

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Solar-driven water splitting to produce hydrogen may be an ideal solution for global energy and environment issues. Among the various photocatalytic systems, platinum has been widely used to co-catalyse the reduction of protons in water for hydrogen evolution. However, the undesirable hydrogen oxidation reaction can also be readily catalysed by metallic platinum, which limits the solar energy conversion efficiency in artificial photosynthesis. Here we report that the unidirectional suppression of hydrogen oxidation in photocatalytic water splitting can be fulfilled by controlling the valence state of platinum; this platinum-based cocatalyst in a higher oxidation state can act as an efficient hydrogen evolution site while suppressing the undesirable hydrogen back-oxidation. The findings in this work may pave the way for developing other high-efficientcy platinum-based catalysts for photocatalysis, photoelectrochemistry, fuel cells and water-gas shift reactions.

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Section: Methodsmentioning

confidence: 99%

Unidirectional suppression of hydrogen oxidation on oxidized platinum clusters

et al. 2013

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“…[15][16][17] Small particles can shorten the diffusion paths of Na + ions, which is crucial for sodium storage because a Na + ion is about 55% larger than a Li + ion. [25][26][27][28][29][30] to protect the ultra-small Fe 3 O 4 nanoparticles from coagulation to ensure that they are evenly anchored on the RGO nanosheets. Three composites were synthesized with a volume of GO of 0.5 mL (~2.67 mg GO), 1 mL (~5.34 mg GO) and 1.5 mL (~8.01 mg GO), and are denoted as RGOF-1, RGOF-2, and RGOF-3, respectively.…”

mentioning

confidence: 99%

One-pot synthesis of ultra-small magnetite nanoparticles on the surface of reduced graphene oxide nanosheets as anodes for sodium-ion batteries

Zhang

Tan

et al. 2015

J. Mater. Chem. A

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“…Among various candidates for the surface modification of SPIONs, ATP is a good stabilizer of SPIONs because it has 3 phosphate groups, is produced in the body, and so is a naturally occurring compound in the body itself. The kinetic properties of iron oxide nanoparticles for their degradation in the body strongly depend on their surface coating (27,28). The transformation and degradation take longer for iron oxide nanoparticles with a polymeric surface coating than for iron oxide nanoparticles with a noncoated surface because of the limited availability and affinity of the iron chelating agents produced intracellularly (23,29).…”

Section: Discussionmentioning

confidence: 99%

Nonpolymeric Surface–Coated Iron Oxide Nanoparticles for In Vivo Molecular Imaging: Biodegradation, Biocompatibility, and Multiplatform

et al. 2013

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A new approach to the surface engineering of superparamagnetic iron oxide nanoparticles (SPIONs) may encourage their development for clinical use. In this study, we demonstrated that nonpolymeric surface modification of SPIONs has the potential to be an advanced biocompatible contrast agent for biomedical applications, including diagnostic imaging in vivo. Methods: Adenosine triphosphate (ATP), which is an innate biomaterial derived from the body, was coated onto the surface of SPIONs. An in vivo degradation study of ATP-coated SPIONs (ATP@SPIONs) was performed for 28 d. To diminish phagocytosis, ATP@SPIONs were surface-modified with gluconic acid. We next studied the ability of the SPIONs to serve as a specific targeted contrast agent after conjugation of cMet-binding peptide. The SPIONs were conjugated with Cy5.5 and labeled with 125 I for multimodality imaging. In vivo and in vitro tumor-targeted binding studies were performed on U87MG cells or a U87MG tumor model using animal SPECT/CT, an optical imaging system, and a 1.5-T clinical MR scanner. Results: ATP@SPIONs showed rapid degradation in vivo and in vitro, compared with ferumoxides. ATP@SPIONs modified with gluconic acid reduced phagocytic uptake, showed improved biodistribution, and provided good targetability in vivo. The gluconic acid-conjugated ATP@SPIONs, when conjugated with cMet-binding peptide, were successfully visualized on the U87MG tumors implanted in mice via multimodality imaging. Conclusion: We suggest that ATP@SPIONs can be used as a multiplatform to target a region of interest in molecular imaging. When we consider the biocompatibility of contrast agents in vivo, ATP@SPIONs are superior to polymeric surface-modified SPIONs.

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Direct Coprecipitation Route to Monodisperse Dual‐Functionalized Magnetic Iron Oxide Nanocrystals Without Size Selection

Cited by 139 publications

References 40 publications

Unidirectional suppression of hydrogen oxidation on oxidized platinum clusters

Unidirectional suppression of hydrogen oxidation on oxidized platinum clusters

One-pot synthesis of ultra-small magnetite nanoparticles on the surface of reduced graphene oxide nanosheets as anodes for sodium-ion batteries

Nonpolymeric Surface–Coated Iron Oxide Nanoparticles for In Vivo Molecular Imaging: Biodegradation, Biocompatibility, and Multiplatform

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