Hyderabad, India
Hyderabad, India

Time filter

Source Type

Takahashi Y.,Hiroshima University | Kondo K.,Aisin Cosmos R and D CO. | Miyaji A.,Hiroshima University | Umeo M.,Hiroshima University | And 2 more authors.
Analytical Sciences | Year: 2012

Given that the supply of several rare earth elements (REEs) is sometimes limited, recycling REEs used in various advanced materials, such as Nd magnets, is important for realizing efficient use of REE resources. In the present work, the feasibility of using DNA for REE recovery and separation was examined, along with the identification of the binding site of REEs in DNA. In particular, a DNA-cellulose filter paper hybrid was prepared so that DNA-based materials can be used for the separation of REEs using columns loaded with DNA. N, N'-Disuccinimidyl was used as a cross-linker reagent for the fixation of DNA onto a fibrous cellulose filter. The results showed that (i) the DNA-filter hybrid has a sufficiently high affinity to adsorb REEs; (ii) the adsorption capacity was 0.182 mg/g for Nd; and (iii) the affinity of REEs for DNA was stronger for REEs with larger atomic numbers. The difference of the affinity among REEs in the third result was compared with the adsorption patterns of REEs discussed in the literature. The comparison suggests that phosphate in the DNA-filter paper hybrid was responsible for REE adsorption onto the hybrid. The results were supported by the Nd, Dy, and Lu LIII-edge EXAFS; the REE-P shell was identified for the second neighboring atom, showing the importance of the phosphate site as REE binding sites. The difference in the affinity among REEs suggest that group separation of REEs (such as La, Ce, (Pr and Nd), (Ho, Dy, and Er), (Tb and Gd), (Sm, Eu), Tm, Yb, and Lu) is possible, although complete isolation of each REE from a solution containing all REEs may be difficult. For practical applications, Nd and Fe(III) were successfully separated from a synthetic solution of Nd magnet waste using columns loaded with the DNAfilter hybrid. © 2012 The Japan Society for Analytical Chemistry.

Giribabu L.,Indian Institute of Chemical Technology | Bessho T.,Institute of Chemical science and Engineering | Srinivasu M.,Indian Institute of Chemical Technology | Vijaykumar C.,Indian Institute of Chemical Technology | And 6 more authors.
Dalton Transactions | Year: 2011

Two new heteroleptic ruthenium(ii) photosensitizers that contains 2,2′;6,2′′-terpyridine with extended π-conjugation with donor groups, a 4,4′-dicarboxylic acid-2,2′-bipyridine anchoring ligand and a thiocyanate ligand have been designed, synthesized and fully characterized by CHN, mass spectrometry, UV-vis and fluorescence spectroscopies and cyclic voltammetry. The new sensitizers have either 3,5-di-tert-butyl phenyl (m-BL-5) or triphenylamine (m-BL-6) groups, where the molar extinction coefficient of both the sensitizers is higher than the analogous ruthenium dyes. Both the sensitizers were tested in dye-sensitized solar cells using two different redox electrolytes. © 2011 The Royal Society of Chemistry.

Imamura C.,Toyota Central R and D Labs. Inc. | Shigemori Y.,Aisin Cosmos R and D Co.
Bioscience, Biotechnology and Biochemistry | Year: 2010

We used directed evolution to enhance the thermostability of formaldehyde dehydrogenase from Pseudo-monas putida. At 50°C, the wild-type enzyme was inactivated within 30min, but the variants obtained retained 80% activity for at least 300 min. At room temperature (30°C), the variants obtained retained <80% activity for at least 500 h (21 d).

Uno S.,Ritsumeikan University | Nakaoki Y.,Aisin Cosmos R and D Co. | Isezaki Y.,Aisin Cosmos R and D Co.
Technical Proceedings of the 2014 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2014 | Year: 2014

Analytic and numerical calculation methods for glucose-fueled enzymatic biofuel cell performance are presented. The output voltage as a function of output current density is formulated by considering the steady-state flux balance, mass transport, enzyme reactions, and electrochemical kinetics. Resulting transcendental equation is numerically solved to determine output voltage at a given current density. The equation is approximated to give an explicit solution, leading to analytic formulae of the cell output performance. Comparison with an experimental data shows excellent agreement. Our method provides a handy but powerful tool for cell design optimization and performance prediction.

Wakui H.,Aisin Cosmos R and D Co. | Hirata Y.,Chubu University
Transactions of Japanese Society for Medical and Biological Engineering | Year: 2013

Reduction in arousal is one of the main causes that lead to lapses of driver's attention. Therefore, in order to keep a safe drive by the operation of driver's own, it is important to detect the reduced arousal as soon as possible. Currently we focused on saccadic eye movements, which can be measured noninvasively, as a possible detector of driver's reduced arousal. In this paper, we evaluated saccades while subjects were performing a simple reaction test and a driving simulation. We found that changes in characteristics of horizontal saccades, i. e. peak velocities and inter-saccadic intervals, were synchronized with the fluctuation of pupil area that is a well known objective measure of arousal level. Further, when the pupil area decreased because of reduced arousal, significant reductions of these saccade parameters were found prior to the occurrence of slow eye movement (SEM) that is another indicator of unconsciousness or aimlessness. Based upon these findings, we conclude that slowed peak horizontal saccade velocity (<40 deg/s) and shortened inter-saccadic interval (<0.2 s) are useful detector of driver's reduced arousal.

Wang X.,Tokyo Institute of Technology | Li D.,Tokyo Institute of Technology | Watanabe T.,Aisin Cosmos R andD Co. | Shigemori Y.,Aisin Cosmos R andD Co. | And 4 more authors.
International Journal of Electrochemical Science | Year: 2012

The utilization of recombinant thermophilic enzymes to construct a glucose/O 2 biofuel cell (BFC) workable in a wide temperature range with enhanced thermostability using thermophilic pyrroloquinoline quinone (PQQ) dependent glucose dehydrogenase (Tth-PQQGDH, active at even 100°C) and laccase (Tth-Lcs) has been studied to improve the thermostability of BFC. In this glucose/O2 biofuel cell system, electrodes were modified with single-walled carbon nanotubes (SWCNTs) based enzyme films. The resulting electrodes demonstrated enhanced biofuel-cell performance in wide temperature range, which allows them to be used at elevated temperatures. © 2012 by ESG.

Chandrasekharam M.,Indian Institute of Chemical Technology | Srinivasarao C.,Indian Institute of Chemical Technology | Suresh T.,Indian Institute of Chemical Technology | Reddy M.A.,Indian Institute of Chemical Technology | And 4 more authors.
Journal of Chemical Sciences | Year: 2011

Heteroleptic ruthenium(II) bipyridyl complex, cis-Ru(II)(4,4'-bis(4-tert- butylstyryl)-2,2'-bipyridyl) (4,4'-dicarboxy-2,2'-bipyridyl) (NCS2) (H112) was synthesized and characterized by 1H-NMR, MASS, Spectrofluorometer and UV-Vis spectroscopes. The photo-voltaic performance of the sensitizer was evaluated in Dye Sensitized Solar Cell (DSSC) under irradiation of AM 1.5 G solar light and the photovoltaic characteristics were compared with those of reference cells of HRS1 and N719 fabricated under comparable conditions. Compared to N719, H112 sensitizer showed enhanced molar extinction coefficient and relatively better monochromatic incident photon-to-current conversion efficiency (IPCE) across the spectral range of 400 to 800 nm with solar energy-to-electrical conversion efficiency (η) of 2.43% [open circuit photovoltage (VOC) = 0.631V, short-circuit photocurrent density (JSC) = 8.96 mA/cm2, fill factor (ff) = 0.430], while η values of 2.51% (VOC = 0.651 V, JSC = 9.41mA/cm 2, ff = 0.410) and 2.74% (VOC = 0.705 V, JSC = 8.62 mA/cm2, ff = 0.455) were obtained for HRS1 and N719 sensitized solar cells respectively. The introduction of 4,4'-bis(4-tert-butylstyryl) moieties on one of the bipyridine moieties of N719 complex shows higher light absorption abilities, IPCE and JSC. © Indian Academy of Sciences.

Murata K.,University of Tsukuba | Shigemori Y.,Aisin Cosmos R AndD Co. | Tsujimura S.,University of Tsukuba
Chemistry Letters | Year: 2015

Here, we report a novel electrochemical activation technique for a Cu-depleted apo-type laccase, MELAC, which was isolated from a compost metagenome. The Cu atoms in the active center of the laccase were removed during the purification process using an anion-exchange column. We demonstrate how the apotype laccase can be activated by an electrochemically generated monovalent Cu+ ion. © 2015 The Chemical Society of Japan.

Sreenivasu M.,Aisin Cosmos R and D Co. | Suzuki A.,Aisin Cosmos R and D Co. | Adachi M.,Aisin Cosmos R and D Co. | Kumar C.V.,Aisin Cosmos R and D Co. | And 8 more authors.
Chemistry - A European Journal | Year: 2014

New porphyrin sensitizers based on donor-π-acceptor (D-π-A) approach have been designed, synthesized, characterized by various spectroscopic techniques and their photovoltaic properties explored. N,N′-Diphenylamine acts as donor, the porphyrin is the π-spacer, and either carboxylic acid or cyanoacryclic acid acts as acceptor. All compounds were characterized by using 1H NMR spectroscopy, ESI-MS, UV-visible emission spectroscopies as well as electrochemical methods. The presence of aromatic groups between porphyrin π-plane and acceptor group push the absorption of both Soret and Q-bands of porphyrin towards the red region. The electrochemical properties suggests that LUMO of these sensitizers above the TiO2 conduction band. Finally, the device was fabricated using liquid redox electrolyte (I-/I3-) and its efficiency was compared with that of a leading sensitizer. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chandrasekharam M.,Indian Institute of Chemical Technology | Rajkumar G.,Aisin Cosmos RandD Co. | Rao C.S.,Indian Institute of Chemical Technology | Suresh T.,Indian Institute of Chemical Technology | Reddy P.Y.,Aisin Cosmos RandD Co.
Synthetic Metals | Year: 2011

A new high molar extinction coefficient ruthenium(II)-bipyridine complex "cis-Ru(4,4′-bis((E)-2-(10-decyl-10H-phenothiazin-3-yl)vinyl)-2, 2′-bipyridine)(4,4′-dicarboxylic acid-2,2′-bipyridine)(NCS) 2 PTZ1″ was synthesized through conjugation of phenothiazine unit with bipyridine and characterized by FT-IR, 1H-NMR and ESI-MASS spectroscopes. Absorption measurements and time dependent-density functional theory (TD-DFT) calculations show increased spectral response for the ancillary ligand and the corresponding complex. The dye upon anchoring onto mesoporous nanocrystalline TiO2 solar cells exhibited solar-to-electric energy conversion efficiency (η) of 3.77% short-circuit photocurrent density (JSC) = 7.79 mA/cm2, open-circuit voltage (VOC) = 640 mV, fill factor = 0.750) under air mass 1.5 sunlight, the reference Z907 and HRS1sensitized solar cells, fabricated and evaluated under identical conditions exhibited η-value of 7.02% (JSC = 15.25 mA/cm 2, VOC = 650 mV, fill factor = 0.705) and 3.05% (J SC = 8.20 mA/cm2, VOC = 610 mV, fill factor = 0.620) respectively. The lower film absorption of PTZ1on TiO2 surface could be probably due to larger molecular diameter and planarity of phenothiazine prone to aggregate in solution as well as on TiO2 surface. The DFT calculations show that the first three HOMOs of PTZ1 have t2g character as observed in case of Z907, while HOMO-4 and HOMO-5 have π-orbitals with major component on phenothiazine moieties of L1. © 2011 Elsevier B.V. All rights reserved.

Loading Aisin Cosmos RandD Co. collaborators
Loading Aisin Cosmos RandD Co. collaborators