Kawaken Fine Chemicals Co

Kawagoe, Japan

Kawaken Fine Chemicals Co

Kawagoe, Japan

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Nagai N.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co. | Nagai N.,Utsunomiya University | Ihara K.,Japan National Institute of Advanced Industrial Science and Technology | And 9 more authors.
Journal of Materials Chemistry | Year: 2012

Boehmite nonwovens with hierarchical texture could be fabricated by a simple procedure consisting of mixing a boehmite nanofibre sol with an organic solvent and filtering the mixture. However, whether the nonwovens were obtained or not depended on the solvents. High polar solvents such as methanol and ethanol caused gelation of the mixture, and low polar solvents such as toluene and ether yielded condensates in the mixture. The medium polar solvents with solubility parameters of 9-12.5, concretely, mixtures of butanol with methanol, ethanol and isopropanol, were favourable for obtaining the nonwovens. The nonwovens consisted of bundles of boehmite nanofibres, and the texture, pore volume, bulk density and porosity of the nonwovens roughly depended on the thickness of the bundles. Thus, thinner bundles and thicker bundles gave dense and loose textures, respectively. The bundles became thicker by increasing the butanol content in the mixed alcohols, and thinner by increasing the methanol, ethanol and isopropanol content. The nonwovens could be transformed from boehmite to θ-Al2O3via γ-Al2O 3 in the crystal phase while maintaining seemingly the original texture when the calcination temperature was raised to 1000 °C stepwise. The nonwovens were tested as sorbents for polycyclic organics such as chromaqurol B, stilbazo and alizarin yellow R in water, and it was found that the nonwovens absorb chromaqurol B and stilbazo effectively, but alizarin yellow R slightly. This journal is © 2012 The Royal Society of Chemistry.


Danjo Y.,Saitama University | Kikuchi I.,Saitama University | Ino Y.,Kawaken Fine Chemicals Co | Ohshima M.-A.,Saitama University | And 2 more authors.
Reaction Kinetics, Mechanisms and Catalysis | Year: 2012

In order to examine the capability of AlPO4 to serve as a catalytic support, we analyzed naphthalene hydrogenation over Pd/AlPO 4 catalyst in the presence of CO. This process is an effective storage strategy in the organic hydride method that uses low grade hydrogen. Pd/AlPO4 demonstrated high activity in naphthalene hydrogenation similar to Pd/SiO2-Al2O3, and retained the activity in much higher extent in the presence of CO as compared to Pd/Al 2O3. The existence of acidic sites on the surface of AlPO4 was confirmed by ammonia adsorption. FT- IR analysis of adsorbed CO after high temperature evacuation revealed that CO desorbed more easily on Pd surface when supported on acidic materials. Detailed analysis of the IR spectra suggested that acidic support decreased the electronic density of Pd and weakened the adsorption bond. Because CO retardation decreased on acidic supports, Pd catalysts demonstrated high activity in the presence of CO. We found that AlPO4 was an effective acidic support for Pd catalyzed hydrogenation. © Akadémiai Kiadó , Budapest, Hungary 2011.


Kodaira T.,Japan National Institute of Advanced Industrial Science and Technology | Suzuki Y.-H.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co. | Matsuda G.,Kawaken Fine Chemicals Co. | And 2 more authors.
Advanced Materials | Year: 2015

An alumina film with highly photoreflective and heat-insulating properties can be simply synthesized using a sol of fibrous boehmite with an additive. The entangled fibers bring about mesopores among them and form stacked 2D nonwoven-like nanosheets. The porosity and the layered structure of alumina accompanying the heat resistivity provide the upper properties that are usually difficult to realize simultaneously. © 2015 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.


Nagai N.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co. | Mizukami F.,Japan National Institute of Advanced Industrial Science and Technology | Mizukami F.,Kawaken Fine Chemicals Co.
Journal of Materials Chemistry | Year: 2011

Transparent and nanoporous self-standing films consisting of oriented boehmite nanofibres were fabricated via the self-assembly of the fibres. The film-forming ability of boehmite nanofibres was closely related to their aspect ratio, and the fibres of 100 to 5000 in aspect ratio were favourable to fabricate the films. Crystallinity and stability of boehmite fibres and the films increased with an increase in the aspect ratio of the fibres. The boehmite films were easily transformed to γ-, - and α-Al 2O 3 films by calcination while keeping the original shapes of the films. Transformation temperatures to γ-, - and α-Al 2O 3 films tended to rise, respectively, with the aspect ratio of the fibres forming the films. When the boehmite films were calcined at the temperatures of 300 °C to 800 °C, the obtained γ-Al 2O 3 films exhibited bright bluish-white emission under the excitation of a UV lamp. The emission intensity tended to increase with a decrease in the aspect ratio of the fibres forming films. This journal is © The Royal Society of Chemistry.


Zhao Z.-G.,Japan National Institute of Advanced Industrial Science and Technology | Zhao Z.-G.,CAS Suzhou Institute of Nano Technology and Nano Bionics | Kodaira T.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co. | And 4 more authors.
Journal of Materials Chemistry | Year: 2012

A self-standing, flexible and transparent microporous film made of alumina nano-fibers is applied as a host to design new functional hybrid materials. Luminescent Schiff base molecules, N-salicylidene-p-toluidine, were found to fully, stably, and homogeneously occupy the slit-like micropore of the film from X-ray diffraction, optical spectra, and N 2 gas adsorption isotherm measurements. Photoluminescence (PL) intensity of the hybrid film was sensitive to the type of transition metal ions dispersed in aqueous solution. For example, Zn 2+ and Cu 2+ ions in the solutions were involved with the apparent increase and decrease of the PL intensity, respectively. This unique alumina film has high potential to be a candidate of a host matrix for designing new hybrid materials with noble functions. © 2012 The Royal Society of Chemistry.


Nagai N.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co. | Suzuki Y.-H.,Japan National Institute of Advanced Industrial Science and Technology | Sekikawa C.,Japan National Institute of Advanced Industrial Science and Technology | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

The texture of porous films prepared from boehmite nanofibres changed from the lengthwise orientation to the random orientation with the addition of ammonia, and with this change, the shape of the pores in the films turned from slit-like into mesh-like while increasing both the pore size and pore volume. The pore size and volume of the films also increased with an increase in the length of the fibres. When the porous films were used for the immobilization of four lipases with different sizes, the films with the mesh texture exhibited higher immobilization ability than the films with the slit texture. It was found that not only the pore size and volume but also the surface charge and hydroxyl groups are important for the immobilization of enzymes. Among the four lipases used, the lipase with the biggest size (ca. 9.5 nm) was most firmly immobilized on the film with the peak top of pore diameter at 10 nm in the distribution curve, and this immobilized lipase exhibited higher activity in the hydrolysis of 2,3-dimercaptopropanol trilactate than the corresponding native one and was recyclable. © 2012 The Royal Society of Chemistry.


PubMed | Japan National Institute of Advanced Industrial Science and Technology and Kawaken Fine Chemicals Co.
Type: Journal Article | Journal: Advanced materials (Deerfield Beach, Fla.) | Year: 2015

An alumina film with highly photoreflective and heat-insulating properties can be simply synthesized using a sol of fibrous boehmite with an additive. The entangled fibers bring about mesopores among them and form stacked 2D nonwoven-like nanosheets. The porosity and the layered structure of alumina accompanying the heat resistivity provide the upper properties that are usually difficult to realize simultaneously.


Patent
Kawaken Fine Chemicals Co., Japan National Institute of Advanced Industrial Science and Technology | Date: 2011-08-31

The present invention provides a porous alumina self-supporting film which has a sufficient strength to be used as a self-supporting film, is flexible and has a high transparency; an alumina sol that is composed of fibrous or needle-like boehmite particles dispersed in a solution and that has a high storage stability; and methods for producing such a film and such an alumina sol. More specifically, the invention provides a porous alumina self-supporting film which is composed of a collection of fibrous or needle-like alumina hydrate particles or alumina particles having an average breadth of 1 to 10 nm, an average aspect ratio (length/breadth) of 30 to 5,000 and an average length of 100 to 10,000 nm, has an orientation, has a pore distribution with a pore diameter d_(peak) of 0.5 to 20 nm, is flexible, has a high transparency, and has the ability to luminesce when excited by ultraviolet light; an alumina sol which has a Na, K and SO_(4) content of 0 to 1 ppm, has an orientation when the particles are collected, and luminesces when excited by ultraviolet light after being fired at 250 to 900C; and methods for producing such a film and such an alumina sol.


Trademark
Kawaken Fine Chemicals Co. | Date: 2010-02-02

Surface active chemical agents, namely, surfactants for use in the manufacture of detergents, personal care products, dental care products, hard surface cleaners; textile auxiliaries, namely, chemicals used in the manufacture of fabric or textiles; chemical additives for use in the manufacture of pharmaceutical preparations for wounds.


Patent
Kawaken Fine Chemicals Co. | Date: 2012-11-26

The object of the present invention is to provide foam booster which the speed of lathering is excellent by using together with foaming surfactant such as anionic surfactants, nonionic surfactants, amphoteric surfactants, dipolar-ionic surfactants, semipolar surfactants and cationic surfactants, a detergent composition containing the same. The present invention is a foam booster comprises aliphatic amine alkylene oxide adduct represented by the general formula (1): [wherein R^(1 )is an alkyl group having 6 to 10 carbon atoms, A^(1)O and A^(2)O represent an oxyethylene group and/or an oxypropylene group and independently from each other, m and n are each independently a whole number more than 0, with 1m+n2.]

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