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Morikawa Y.,Aichi Center for Industry and Science and Technology | Kondo T.,Food Research Center | Hayashi N.,Aichi Center for Industry and Science and Technology | Ito M.,Fuji Silysia Chemical Ltd | Takai K.,Sanki A. F. I. Co
Kagaku Kogaku Ronbunshu | Year: 2014

Aldehyde oxidase (AOX)-immobilized silica gel (AOX-SG) was developed as a means to remove formaldehyde in the gas phase by enzyme degradation. AOX from the formaldehyde-tolerant microorganism Paecillomyces variotii IRI017, which we newly isolated from soil, was utilized. Amino group-binding silica gel (AminoSG) was prepared by APTE (3-aminopropyl triethoxysilane) treatment. All types of AOX-immobilized silica gels were oven-dried at 50°C to constant weight, and formaldehyde degradation by the dried AOX-SG or AOX-aminoSG was examined. Humidified air containing 0.4–0.5 ppm of formaldehyde was passed continuously through SG columns packed with one of four types silica gels: SG, AminoSG, AOX-SG, and AOX-aminoSG. Formaldehyde in test air was removed in the early period in all types of SG by adsorption. With SG and AminoSG, however, formaldehyde removal decreased sharply and become zero within 20 d because of saturation of the gel by formaldehyde. With AOX-SG and AOX-aminoSG, removal of more than 90% of formaldehyde continued for more than 90 d. These results suggest that formaldehyde in the test air was adsorbed by silica gels and degraded by immobilized AOX. © 2014 The Society of Chemical Engineers, Japan.


Matsumoto T.,University of Miyazaki | Mitsumura Y.,University of Miyazaki | Miyamoto M.,University of Miyazaki | Matsumoto J.,University of Miyazaki | And 4 more authors.
Analytical Sciences | Year: 2011

A sensitive and easily distinguishable cobalt-free humidity indicator of porphyrin-silica gel-MgCl2 composite was prepared from pH-induced spectra changeable tetraarylporphyrin, silica gel (SiO2), and MgCl2. The pH change arose from proton release under dry conditions, and proton capture under humid conditions by a reversible reaction between MgCl2 and a silanol group of SiO2. A pink-orange porphyrin-Si(OH)2-MgCl2 composite was dried to give a green protonated porphyrin-SiO2Mg composite. The optimized concentrations of MgCl2 to make the concentrations of protonated porphyrin maximum under dry conditions were determined by absorption spectrometry of the green composite using a confocal laser scanning microscope as a microscopic spectrometer. Moreover, the green composite was prepared by heating dichloro(tetraarylporphyrinato)phosphorus chloride with MgCl2 and SiO2. The humidity-sensitivity of the green composite was evaluated by the absorption spectra under controlled humidity. A distinguishable color change of the green composite took place below 30% of relative humidity. 2011 © The Japan Society for Analytical Chemistry.


Okabayashi H.-F.,Nagoya Institute of Technology | Izawa K.-I.,Fuji Silysia Chemical Ltd. | Sumiya A.,Nagoya Institute of Technology | Eastoe J.,University of Bristol | O'Connor C.J.,University of Auckland
Bulletin of the Chemical Society of Japan | Year: 2010

The IR spectra in the 13001450 cm-1 region, which reflect the CH and CH2 deformation vibrational modes of the succinate skeleton, have been investigated in detail for sodium dialkylsulfonates (alkyl groups: Ethyl, n-propyl, n-butyl, n-hexyl, n-heptyl, n-octyl, n-decyl, and n-dodecyl) and sodium 1,2-bis(2-ethylhexyl)sulfosuccinate (sodium 1,2-bis(2- ethylhexyloxycarbonyl)ethanesulfonate) (AOT). The results have provided clear evidence that two configurations, arising from the difference in the torsion angles of the succinate skeleton, are preferentially stabilized in aqueous solution as well as in the solid state, depending upon the concentration. Thus, the IR spectra of this region can be used as a powerful tool for elucidation of the mechanism of the disorderorder transition in aggregate systems of AOT or its homologs at the molecular level. © 2010 The Chemical Society of Japan.


Suciu C.V.,Fukuoka Institute of Technology | Tani S.,Fukuoka Institute of Technology | Yaguchi K.,Fuji Silysia Chemical Ltd
Acta Mechanica | Year: 2010

In this work, fatigue fracture tests on liquid-repellent nanoporous silica micro-particles dispersed in water are reported; then, models of the grain cracking and fragmentation are proposed. Such tests can be regarded, from an external standpoint, as conducted under temporally variable but spatially uniform pressure distribution in the liquid surrounding the silica grains, or from an internal standpoint, as surface fatigue that occurs at the cyclical adsorption/desorption of water in/from the nanoporous particles. The test rig represents a compression-decompression cylinder divided into two chambers, one of constant volume and the other of variable volume. Silica is introduced inside the cavity of fixed volume, and a micro-filter is used to separate it from the chamber of variable volume, in which only water is supplied. Experimental results suggest that the fatigue fracture of silica particles occurs from the inside, explosion-like, oppositely to the previously reported implosion-like collapse of silica under wet pressurization. This is accompanied by enhancement of the hydrophilic silanol groups on the silica surface and by redistribution of the size of particles and pores. Critical numbers of cycles to achieve fracture of the silica particles obtained experimentally, and from the models of grain cracking and fragmentation, under cyclical pressurization, are in good agreement. © 2010 Springer-Verlag.


Fujii H.,Kitasato University | Yamada T.,Kitasato University | Hayashida K.,Kitasato University | Kuwada M.,Kitasato University | And 4 more authors.
Heterocycles | Year: 2012

A newly developed SO 3H silica gel cleaved the O-Si bonds in various aryl and alkyl silyl ethers to give the corresponding phenols and alcohols in good to excellent yield. The crude filtrates contained no silyl residues. The solid phase 29Si NMR analyses of the SO 3H silica gel strongly suggested that the silyl residues were captured by silanol groups on the surface of the silica gel. The SO 3H silica gel could be recycled at least ten times without any loss of activity. The disappearance of silyl residues in the crude filtrate was observed in even the 10th repetition. Our method provides an easily handled desilylation method that requires no further purification. Our method was also applicable to a selective desilylation reaction of a derivative 5 with different siloxy groups or desilylation of an alkaloid derivative 7. © 2012 The Japan Institute of Heterocyclic Chemistry.


Trademark
Fuji Silysia Chemical Ltd. | Date: 2016-06-13

Chemicals; industrial chemicals; chemicals for industrial purposes; chemicals for industrial use; humidity agents; humidity controlling agents; humidity conditioning agents.


Trademark
Fuji Silysia Chemical Ltd. | Date: 2011-07-19

Chromatography columns for industrial purposes; thin layer plates for chromatography for industrial purposes; chromatography columns for laboratory use; thin layer plates for chromatography for laboratory use.


Patent
Fuji Silysia Chemical Ltd. | Date: 2014-07-16

Porous silica-carbon composites are obtained by mixing fine particulate carbon dispersed in water by a surfactant, alkali metal silicate aqueous solution, and mineral acid so as to produce co-dispersion in which silica hydrosol, produced by reaction of the alkali metal silicate and the mineral acid, and the fine particulate carbon are uniformly dispersed, and gelling silica hydrosol, contained in the co-dispersion, and making the co-dispersion into porous bodies. The porous silica-carbon composites are prepared so as to have specific surface area from 20 to 1000 m^(2)/g, pore volume from 0.3 to 2.0 ml/g, and average pore diameter from 2 to 100 nm.


Patent
Fuji Silysia Chemical Ltd. | Date: 2012-09-06

Porous silica-carbon composites are obtained by mixing fine particulate carbon dispersed in water by a surfactant, alkali metal silicate aqueous solution, and mineral acid so as to produce co-dispersion in which silica hydrosol, produced by reaction of the alkali metal silicate and the mineral acid, and the fine particulate carbon are uniformly dispersed, and gelling silica hydrosol, contained in the co-dispersion, and making the co-dispersion into porous bodies. The porous silica-carbon composites are prepared so as to have specific surface area from 20 to 1000 m^(2)/g, pore volume from 0.3 to 2.0 ml/g, and average pore diameter from 2 to 100 nm.

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