Radiochemical Synthesis of Au/Iron-oxide Composite Nanoparticles Using PEG

2007 ◽  
Vol 1064 ◽  
Author(s):  
Satoshi Seino ◽  
Takuya Kinoshita ◽  
Juinichi Iida ◽  
Yujin Shibata ◽  
Takashi Nakagawa ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Average Diameter ◽  
Composite Nanoparticles ◽  
Polyethylene Glycols ◽  
Oxide Nanoparticles ◽  
Gold Particles ◽  
Adsorbed Sulfur ◽  
Sulfur Containing ◽  
Radiochemical Synthesis

ABSTRACTComposite nanoparticles consisting of gold and iron-oxide were radiochemically synthesized in aqueous solution systems by using polyethylene glycols. The gold particles with average diameter of 3 nm were firmly immobilized on the surface of the support iron-oxide nanoparticles. The composite nanoparticles specifically adsorbed sulfur-containing amino acids by a Au-S bonding.

Relaxivity of T$_1$ and T$_2$ of Hydrogen Protons in an Aqueous Solution of Silica-coated Iron-oxide Nanoparticles

2010 ◽  
Vol 60 (2) ◽  
pp. 254-259 ◽  
Author(s):  
Tanveer AHMAD ◽  
Ilsu RHEE* ◽  
Sungwook HONG ◽  
Yongmin CHANG ◽  
Jaejun LEE
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

New Iron Oxide Nanoparticles Catechol-Grafted with Bis(amidoxime)s for Uranium(VI) Depletion of Aqueous Solution

2019 ◽  
Vol 19 (8) ◽  
pp. 4911-4919 ◽  
Author(s):  
Eva Mazarío ◽  
Jérémy Stemper ◽  
Ahmed Sami Helal ◽  
Alvaro Mayoral ◽  
Philippe Decorse ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

SONOCHEMICAL PREPARATION OF GOLD/IRON OXIDE COMPOSITE MAGNETIC NANOPARTICLES AND SELECTIVE MAGNETIC SEPARATION OF BIOMOLECULES

2006 ◽  
Vol 05 (02n03) ◽  
pp. 359-363 ◽  
Author(s):  
YOSHITERU MIZUKOSHI ◽  
SATOSHI SEINO ◽  
KENJI OKITSU ◽  
TAKUYA KINOSHITA ◽  
TAKASHI NAKAGAWA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Amino Acids ◽  
External Magnetic Field ◽  
Au Nanoparticles ◽  
Average Diameter ◽  
Composite Nanoparticles ◽  
Magnetic Separations ◽  
Magnetic Carriers ◽  
Standard Solution ◽  
Sulfur Containing

We have successfully prepared Au nanoparticles by the sonochemically reducing Au(III) ions and immobilized them on the surface of magnetic γ- Fe 2 O 3 nanoparticles. Au particles with average diameter of about 10 nm were homogeneously dispersed on the surface of γ- Fe 2 O 3 (average diameter : 26 nm) without aggregation. Au nanoparticles are known to selectively adsorb the molecules having sulfur. Aiming at the uses for magnetic carriers of specific biomolecules, we employed prepared composite nanoparticles for selective separation of biomolecules and estimated their adsorption properties. The composite nanoparticles exhibited a high affinity with glutathione, a tripeptide with mercapto group, so that separation and manipulation of glutathione in aqueous solutions could be performed by applying an external magnetic field. Magnetic separations of amino acids were also investigated. Composite nanoparticles were mixed with amino acid standard solution containing 17 kinds of amino acids and their magnetic separations were carried out by applying an external magnetic field. It was found that adsorption amounts of methionine and cystine, containing internal sulfur were larger than other amino acids. The adsorbed amounts of sulfur containing amino acids increased with relative amount of Au in the composite nanoparticles.

Optimizing the silanization of thermally-decomposed iron oxide nanoparticles for efficient aqueous phase transfer and MRI applications

RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 93784-93793 ◽  
Author(s):  
Xin-Yang Wang ◽  
Damien Mertz ◽  
Cristina Blanco-Andujar ◽  
Anindita Bora ◽  
Mathilde Ménard ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Aqueous Phase ◽  
Phase Transfer ◽  
Oxide Nanoparticles

A facile silanization method allows to efficiently stabilise in aqueous solution iron oxide NPs synthesized by thermal decomposition for MRI applications.

scholarly journals Preparation and conductivities of polyacrylic acid/polyvinylimidazole grafted and ungrafted iron oxide nanocomposite polymer electrolytes

2013 ◽  
Vol 11 (11) ◽  
pp. 1768-1779
Author(s):  
Mehmet Senel ◽  
Hüseyin Kavas ◽  
Mehmet Tutgun ◽  
Abdulhadi Baykal
Keyword(s):  
Iron Oxide ◽  
Polyacrylic Acid ◽  
Polymer Electrolytes ◽  
Conduction Mechanism ◽  
Average Diameter ◽  
Molar Ratio ◽  
Oxide Nanoparticles ◽  
Nanocomposite Polymer ◽  
Co Precipitation ◽  
Nanocomposite Polymer Electrolytes

AbstractNanocomposites of Polyacrylic acid/polyvinylimidazole (PAA/PVI) with grafted and ungrafted iron oxide nanoparticles were prepared by a Reflux method. The Fe3O4 nanoparticles with 10 nm average diameter were synthesized by controlled co-precipitation and silanization of Si-PVI on Fe3O4 was used to obtain the grafted ones. Grafting becomes important at composites of less PVI that cause drastic decreases in AC conductivity. The content of PVI has important effects on the conductivity mechanism of these composites. The effect of grafting and Polyacrylic acid/polyvinylimidazole molar ratio on the conduction mechanism were studied. The conduction mechanism of iron oxide nanocomposites can be adjusted by changing molar ratio of Polyacrylic acid/polyvinylimidazole and grafting of Fe3O4NPs.

scholarly journals Colloidal and chemical stabilities of iron oxide nanoparticles in aqueous solutions: the interplay of structural, chemical and environmental drivers

2018 ◽  
Vol 5 (4) ◽  
pp. 992-1001 ◽  
Author(s):  
E. Demangeat ◽  
M. Pédrot ◽  
A. Dia ◽  
M. Bouhnik-le-Coz ◽  
F. Grasset ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Aqueous Solutions ◽  
Iron Oxide Nanoparticles ◽  
Environmental Drivers ◽  
Oxide Nanoparticles ◽  
Intrinsic Properties ◽  
Complex Balancing

The behaviour of nanoparticles in aqueous solution resulting from a complex balancing between pH, surficial and intrinsic properties of nanoparticles.

Magnetic iron oxide nanoparticles encapsulating horseradish peroxidase (HRP): synthesis, characterization and carrier for the generation of free radicals for potential applications in cancer therapy

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 111099-111108 ◽  
Author(s):  
Nikesh Gupta ◽  
Chetna Gupta ◽  
Sandeep Sharma ◽  
Brijesh Rathi ◽  
Rakesh Kumar Sharma ◽  
...  
Keyword(s):  
Free Radicals ◽  
Iron Oxide ◽  
Horseradish Peroxidase ◽  
Iron Oxide Nanoparticles ◽  
Average Diameter ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Cancerous Cell ◽  
Potential Applications ◽  
20 Nm

We report synthesis of iron oxide nanoparticles encapsulating HRP. The average diameter of the particles was around 20 nm. HRP has been used to convert IAA to a toxic oxidized product and its toxic effect has been seen on cancerous cell lines.

scholarly journals Precipitation of Zinc Oxide Nanoparticles in Bicontinuous Microemulsions

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Liliana E. Romo ◽  
Hened Saade ◽  
Bertha Puente ◽  
Ma. Luisa López ◽  
Rebeca Betancourt ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Sodium Hydroxide ◽  
Zinc Oxide Nanoparticles ◽  
Sodium Dodecyl ◽  
Particle Diameter ◽  
Average Diameter ◽  
Zinc Nitrate ◽  
Oxide Nanoparticles ◽  
Sulfosuccinate Sodium

Zinc oxide nanoparticles were obtained directly, avoiding the calcination step, by precipitation at 70°C in bicontinuous microemulsions stabilized with a mixture of surfactants sodium bis (2-ethylhexyl) sulfosuccinate/sodium dodecyl sulfate (2/1, wt./wt.) containing 0.7 M zinc nitrate aqueous solution. Two concentrations of aqueous solution of precipitating agent sodium hydroxide were used under different dosing times on microemulsion. Characterization by X-ray diffraction and electron microscopy allowed us to identify particles with an acicular rod-like morphology and a hexagonalwurtzitecrystal structure as small as 8.5 and 30 nm in average diameter and length, respectively. Productivities much higher than those typical in the preparation of zinc oxide nanoparticles via reverse microemulsions were obtained. Particle size was the same at the two studied sodium hydroxide concentrations, while it increases as dosing time of the precipitant agent increases. It is believed that the surfactant film on the microemulsion channels restricts the particle diameter growth.

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