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Kupper F.C.,Scottish Association for Marine Science | Feiters M.C.,Radboud University Nijmegen | Olofsson B.,University of Stockholm | Kaiho T.,Kanto Natural Gas Development Co. | And 7 more authors.
Angewandte Chemie - International Edition | Year: 2011

Iodine was discovered as a novel element in 1811 during the Napoleonic Wars. To celebrate the bicentennial anniversary of this event we reflect on the history and highlight the many facets of iodine research that have evolved since its discovery. Iodine has an impact on many aspects of life on Earth as well as on human civilization. It is accumulated in high concentrations by marine algae, which are the origin of strong iodine fluxes into the coastal atmosphere which influence climatic processes, and dissolved iodine is considered a biophilic element in marine sediments. Iodine is central to thyroid function in vertebrates, with paramount implications for human health. Iodine can exist in a wide range of oxidation states and it features a diverse supramolecular chemistry. Iodine is amenable to several analytical techniques, and iodine compounds have found widespread use in organic synthesis. Elemental iodine is produced on an industrial scale and has found a wide range of applications in innovative materials, including semiconductors-in particular, in solar cells. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Patent
Omikenshi Co., Kanto Natural Gas Development Co. and Ezaki Glico Co. | Date: 2010-06-17

A method for producing an amylose-containing rayon fiber, comprising the steps of: mixing an aqueous alkaline solution of amylose with viscose to obtain a mixed liquid, spinning the mixed liquid to obtain an amylose-containing rayon fiber, and bringing the amylose-containing rayon fiber into contact with iodine or polyiodide ions, thereby allowing an amylose in the amylose-containing rayon fiber to make a clathrate including the iodine or polyiodide ions, wherein the amylose is an enzymatically synthesized amylose having a weight average molecular weight of 310^(4 )or more and 210^(5 )or less. A method for collecting iodine from brackish water with high efficiency utilizing the amylase-containing rayon fibers.


Patent
Omikenshi Co., Ezaki Glico Co. and Kanto Natural Gas Development Co. | Date: 2012-04-25

Amethod for producing an amylose-containing rayon fiber, comprising the steps of: mixing an aqueous alkaline solution of amylose with viscose to obtain a mixed liquid, spinning the mixed liquid to obtain an amylose-containing rayon fiber, and bringing the amylose-containing rayon fiber into contact with iodine or polyiodide ions, thereby allowing an amylose in the amylose-containing rayon fiber to make a clathrate including the iodine or polyiodide ions, wherein the amylose is an enzymatically synthesized amylose having a weight average molecular weight of 3 x 10^(4) or more and 2 x 10^(5) or less. A method for collecting iodine from branckish water with high efficiency utilizing the amylase-containing rayon fibers.


Fuse S.,Tokyo Institute of Technology | Asai Y.,Tokyo Institute of Technology | Sugiyama S.,Tokyo Institute of Technology | Matsumura K.,Tokyo Institute of Technology | And 6 more authors.
Tetrahedron | Year: 2014

We have developed a one-pot, four-component Suzuki-Miyaura coupling for the synthesis of thiophene-based donor-π-bridge-acceptor (D-π-A) dyes for dye-sensitized solar cells. Two D-π-A dyes, 19 and 20, retaining 3,4-ethylenedioxythiophene (EDOT) beside a cyanoacrylic acid moiety, and one D-π-A dye 21 without EDOT (reference compound) were rapidly synthesized in accordance with the developed procedure. The measurement of the absorption spectra and the electrochemical properties of synthesized dyes, and the photovoltaic properties of solar cells that were prepared using the synthesized dyes 19-21, revealed that the dyes retaining only one EDOT beside a cyanoacrylic acid moiety would exert a high Jsc. © 2014 Elsevier Ltd.


Matsumura K.,Tokyo Institute of Technology | Yoshizaki S.,Tokyo Institute of Technology | Maitani M.M.,Tokyo Institute of Technology | Wada Y.,Tokyo Institute of Technology | And 6 more authors.
Chemistry - A European Journal | Year: 2015

This one-pot, four-component coupling approach (Suzuki-Miyaura coupling/C-H direct arylation/Knoevenagel condensation) was developed for the rapid synthesis of thiophene-based organic dyes for dye-sensitized solar cells (DSSCs). Seven thiophene-based, organic dyes of various donor structures with/without the use of a 3,4-ethylenedioxythiophene (EDOT) moiety were successfully synthesized in good yields based on a readily available thiophene boronic acid pinacol ester scaffold (one-pot, 3-step, 35-61 %). Evaluation of the photovoltaic properties of the solar cells that were prepared using the synthesized dyes revealed that the introduction of an EDOT structure beside a cyanoacrylic acid moiety improved the short-circuit current (Jsc) while decreasing the fill factor (FF). The donor structure significantly influenced the open-circuit voltage (Voc), the FF, and the power conversion efficiency (PCE). The use of a n-hexyloxyphenyl amine donor, and our originally developed, rigid, and nonplanar donor, both promoted good cell performance (η=5.2-5.6 %). © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Fuse S.,Tokyo Institute of Technology | Sugiyama S.,Tokyo Institute of Technology | Maitani M.M.,Tokyo Institute of Technology | Wada Y.,Tokyo Institute of Technology | And 5 more authors.
Chemistry - A European Journal | Year: 2014

The creation of organic dyes with excellent high power conversion efficiency (PCE) is important for the further improvement of dye-sensitized solar cells. We wish to describe the rapid synthesis of a 112-membered donor-π-acceptor dye library by a one-pot procedure, evaluation of PCEs, and elucidation of structure-property relationships. No obvious correlations between ε, and the η were observed, whereas the HOMO and LUMO levels of the dyes were critical for η. The dyes with a more positive EHOMO, and with an ELUMO<-0.80 V, exerted higher PCEs. The proper driving forces were crucial for a high Jsc, and it was the most important parameter for a high η. The above criteria of EHOMO and E LUMO should be useful for creating high PCE dyes; nevertheless, that was not sufficient for identifying the best combination of donor, π, and acceptor blocks. Combinatorial synthesis and evaluation was important for identifying the best dye. Combinatorial chemistry: A 112-membered donor-π-acceptor dye library was rapidly constructed by a one-pot, three-component coupling procedure (see scheme, SM=Suzuki-Miyaura). The evaluation of absorption spectroscopic and electrochemical measurements of all synthesized dyes, and cell performances of the selected 54 dyes were performed. The dyes with a more positive EHOMO, and with an E LUMO<-0.80 V, exerted higher power conversion efficiencies. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


PubMed | Yokohama College of Pharmacy, Kyushu Institute of Technology, Kanto Natural Gas Development Co. and Tokyo Institute of Technology
Type: Journal Article | Journal: Chemistry (Weinheim an der Bergstrasse, Germany) | Year: 2015

This one-pot, four-component coupling approach (Suzuki-Miyaura coupling/C-H direct arylation/Knoevenagel condensation) was developed for the rapid synthesis of thiophene-based organic dyes for dye-sensitized solar cells (DSSCs). Seven thiophene-based, organic dyes of various donor structures with/without the use of a 3,4-ethylenedioxythiophene (EDOT) moiety were successfully synthesized in good yields based on a readily available thiophene boronic acid pinacol ester scaffold (one-pot, 3-step, 35-61%). Evaluation of the photovoltaic properties of the solar cells that were prepared using the synthesized dyes revealed that the introduction of an EDOT structure beside a cyanoacrylic acid moiety improved the short-circuit current (Jsc) while decreasing the fill factor (FF). The donor structure significantly influenced the open-circuit voltage (Voc), the FF, and the power conversion efficiency (PCE). The use of a n-hexyloxyphenyl amine donor, and our originally developed, rigid, and nonplanar donor, both promoted good cell performance (=5.2-5.6%).


Patent
Kanto Natural Gas Development Co. | Date: 2016-04-27

To reduce operation time and ensure strength of a covering member. The method includes; causing the first sheet to memorize a shape of curvature having a predetermined radius of curvature by curing a first resin while holding the first sheet with the predetermined radius of curvature, the first sheet being impregnated with the first resin (S1); wrapping the first sheet around a radially expandable cylindrical packer and tentatively fastening the first sheet to the packer, wherein the packer has a radius that is smaller than the predetermined radius of curvature (S3); forming a laminated sheet assembly by attaching a plurality of sheets to each other with a second resin (S2); forming the covering member by wrapping the laminated sheet assembly around an outer surface of the first sheet via a third resin and tentatively fastening the laminated sheet assembly, the first sheet being wrapped around the packer (S4); applying a fourth resin to an outer surface of the laminated sheet assembly of the covering member and inserting the packer into a cylindrical tube (S5); radially expanding the packer in the cylindrical tube to release the tentative fastening of the first sheet and the laminated sheet assembly, thereby pressing the covering member against an inner wall of the cylindrical tube via the fourth resin (S6); pulling out the packer from the cylindrical tube (S7); and curing the second (S8).


Patent
Kanto Natural Gas Development Co. | Date: 2014-03-26

To reduce operation time and ensure strength of a covering member. The method includes; causing the first sheet to memorize a shape of curvature having a predetermined radius of curvature by curing a first resin while holding the first sheet with the predetermined radius of curvature, the first sheet being impregnated with the first resin (S1); wrapping the first sheet around a radially expandable cylindrical packer and tentatively fastening the first sheet to the packer, wherein the packer has a radius that is smaller than the predetermined radius of curvature (S3); forming a laminated sheet assembly by attaching a plurality of sheets to each other with a second resin (S2); forming the covering member by wrapping the laminated sheet assembly around an outer surface of the first sheet via a third resin and tentatively fastening the laminated sheet assembly, the first sheet being wrapped around the packer (S4); applying a fourth resin to an outer surface of the laminated sheet assembly of the covering member and inserting the packer into a cylindrical tube (S5); radially expanding the packer in the cylindrical tube to release the tentative fastening of the first sheet and the laminated sheet assembly, thereby pressing the covering member against an inner wall of the cylindrical tube via the fourth resin (S6); pulling out the packer from the cylindrical tube (S7); and curing the second (S8).


PubMed | Japan National Institute of Advanced Industrial Science and Technology, Kanto Natural Gas Development Co., Japan National Institute of Radiological Sciences and Japan Oil, Gas and Metals National Corporation
Type: Journal Article | Journal: The ISME journal | Year: 2015

The Minami-Kanto gas field, where gases are dissolved in formation water, is a potential analogue for a marine gas hydrate area because both areas are characterized by the accumulation of microbial methane in marine turbidite sand layers interbedded with mud layers. This study examined the physicochemical impacts associated with natural gas production and well drilling on the methanogenic activity and composition in this gas field. Twenty-four gas-associated formation water samples were collected from confined sand aquifers through production wells. The stable isotopic compositions of methane in the gases indicated their origin to be biogenic via the carbonate reduction pathway. Consistent with this classification, methanogenic activity measurements using radiotracers, culturing experiments and molecular analysis of formation water samples indicated the predominance of hydrogenotrophic methanogenesis. The cultivation of water samples amended only with methanogenic substrates resulted in significant increases in microbial cells along with high-yield methane production, indicating the restricted availability of substrates in the aquifers. Hydrogenotrophic methanogenic activity increased with increasing natural gas production from the corresponding wells, suggesting that the flux of substrates from organic-rich mudstones to adjacent sand aquifers is enhanced by the decrease in fluid pressure in sand layers associated with natural gas/water production. The transient predominance of methylotrophic methanogens, observed for a few years after well drilling, also suggested the stimulation of the methanogens by the exposure of unutilized organic matter through well drilling. These results provide an insight into the physicochemical impacts on the methanogenic activity in biogenic gas deposits including marine gas hydrates.

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