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Nakanishi, Chikashi; Ikeda, Saori; Isobe, Tetsuhiko; Senna, Mamoru

doi:10.1023/a:1020749604691

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The resulting materials exhibit ultralow density, very large surface area, low refractive index, and low sound velocity. 8 Inside the pores, metal or metal oxide nanophases can be either embedded (mixing particles of the desired phase in the gel) 1,2 or synthesized in situ (using salt precursors of the metal in the gel), conferring multifunctional electronic, 9 magnetic, [10][11][12][13] optical, 14,15 and catalytic 16 properties to the composites.…”

Section: Introductionmentioning

confidence: 99%

Ultraporous Single Phase Iron Oxide−Silica Nanostructured Aerogels from Ferrous Precursors

et al. 2004

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Monoliths of iron oxide-silica aerogel nanocomposites have been synthesized using a novel synthesis route which consists of impregnating silica wet gels with anhydrous iron(II) precursors followed by ethanol supercritical drying of the gels. The process yields aerogels exhibiting high porosity, large surface areas (approximately 900 m2/g), rather low densities (approximately 0.6 g/cm3), and a homogeneous distribution of single-phase maghemite, gamma-Fe2O3, nanoparticles with average sizes in the 7-8 nm range. Remarkably, the gamma-Fe2O3 nanoparticles are obtained in the as-dried state without the need of postannealing. The nanoparticles are mostly superparamagnetic at room temperature but become blocked in a ferrimagnetic state at lower temperatures.

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Section: Introductionmentioning

confidence: 99%

Ultraporous Single Phase Iron Oxide−Silica Nanostructured Aerogels from Ferrous Precursors

et al. 2004

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“…5 We further found the formation of Fe(II)-bpy by UV irradiation (365 ¡ 25 nm) on the mixture of FeCl 3 and bpy with and without the presence of silica sol. 6 Formation of the complex by the processes mentioned above parallels the change in the color and the electron spin states, enabling the preparation of photo-responsive silica microspheres by adding FeCl 3 and bpy to silica sol. 6 During our serial studies, we suspected an important role of [FeCl 4 ] 2 as an intermediate.…”

Section: Introductionmentioning

confidence: 99%

“…6 Formation of the complex by the processes mentioned above parallels the change in the color and the electron spin states, enabling the preparation of photo-responsive silica microspheres by adding FeCl 3 and bpy to silica sol. 6 During our serial studies, we suspected an important role of [FeCl 4 ] 2 as an intermediate. The complex ion [FeCl 4 ] 2 is capable of photo-reduction with a simultaneous formation of a chlorine radical to serve as a photo-catalyst.…”

Section: Introductionmentioning

confidence: 99%

Formation of composite microspheres comprising a 2,2′-bipyridyl iron(ii/iii) complex and acrylamide by UV irradiation

Ikeda

Senna

2004

J. Mater. Chem.

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Colourimetric solid‐phase extraction coupled with fibre optic reflectance spectroscopy for determination of ascorbic acid in pharmaceutical formulations

Filik

Aksu

Giray

et al. 2011

Drug Testing and Analysis

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A redox colourimetric solid-phase extraction (C-SPE) procedure for the determination of ascorbic acid (AA) in pharmaceutical formulations was proposed. Iron (III)-2,2'-dipyridyl (Fe(III)-Bpy) reagent solution was used as a colouring reagent for AA and the immobilization of the redox product onto Amberlite XAD-16 resin was achieved. The analyte in the sample reacted with a solid sorbent loaded with the colourimetric reagent (Fe(III)-Bpy) and then quantified directly on the sorbent surface by using a fibre optic reflectance spectrometer (FORS). The amount of AA was reflectometrically determined in a few seconds with a total sample workup and readout time of ∼10 min using only 10-ml sample volumes. The limit of detection (LOD) and quantification (LOQ) values were 0.18 and 0.6 mg L(-1), respectively, and the linear dynamic range for AA extended up to 8.8 mg L(-1). The C-SPE for different extractions (n = 5) gave a relative standard deviation (RSD) of 2.9% at 5.28 mg L(-1) AA level.

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Cited by 4 publications

References 7 publications

Ultraporous Single Phase Iron Oxide−Silica Nanostructured Aerogels from Ferrous Precursors

Ultraporous Single Phase Iron Oxide−Silica Nanostructured Aerogels from Ferrous Precursors

Formation of composite microspheres comprising a 2,2′-bipyridyl iron(ii/iii) complex and acrylamide by UV irradiation

Colourimetric solid‐phase extraction coupled with fibre optic reflectance spectroscopy for determination of ascorbic acid in pharmaceutical formulations

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