ASAKAWA Naoki

J-GLOBAL         Last updated: Jan 3, 2019 at 01:26
 
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Name
ASAKAWA Naoki
URL
http://efpslab.dept.eng.gunma-u.ac.jp
Affiliation
Gunma University
Job title
Associate Professor

Research Areas

 
 

Academic & Professional Experience

 
1993
 - 
1994
:  Washington University in St.Louis Chemistry Department Visiting Scientist 
 

Education

 
 
 - 
1995
Graduate School, Division of Science and Engineering, Tokyo Institute of Technology
 
 
 - 
1991
Faculty of Engineering, Tokyo Institute of Technology
 

Published Papers

 
Kunito Fukuda, Naoki Asakawa
Macromolecular Chemistry and Physics   219    Feb 2018
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Pauli spin blockade associated with bipolaron formation from positively charged mobile and trapped polarons in a regioregular poly(3-hexylthiophene-2,5-diyl) (RR-P3HT) Schottky barrier diode is d...
Yoshiharu Suzuki, Naoki Asakawa
Physical Review E   97    Jan 2018
© 2018 American Physical Society. The application of noise to a nonlinear system can have the effect of increasing the signal transmission of the system through the phenomenon of stochastic resonance (SR). This paper presents an analytical charact...
Kunito Fukuda, Naoki Asakawa
Journal of Physics D: Applied Physics   50    Jan 2017
© 2017 IOP Publishing Ltd. Reported is the observation of dark spin-dependent electrical conduction in a Schottky barrier diode with pentacene (PSBD) using electrically detected magnetic resonance at room temperature. It is suggested that spin-dep...
Fukuda, Kunito; Asakawa, Naoki
FRONTIERS IN MATERIALS   4 UNSP 24   2017
Kunito Fukuda, Naoki Asakawa
Review of Scientific Instruments   87    Nov 2016
© 2016 Author(s). A straightforward method for a variable frequency electron spin resonance/electrically detected magnetic resonance (ESR/EDMR) spectroscopy using a C-band microwave cavity equipped with waveguide windows is presented. The method e...
Yoshiharu Suzuki, Kiyohiko Matsubara, Naoki Asakawa
Applied Physics Letters   109    Aug 2016
© 2016 Author(s). Stochastic resonance phenomenon was observed in organic field effect transistor using poly(3-hexylthiophene), which enhances performance of signal transmission with application of noise. The enhancement of correlation coefficient...
Yoshihiro Hayashi, Akimitsu Miyaji, Ken Motokura, Naoki Asakawa, Toshihide Baba
Journal of Physical Chemistry C   120 9207-9217   May 2016
© 2016 American Chemical Society. Zeolite materials are used as solid acid catalysts in petrochemical reactions, which typically occur at Brønsted acid sites located at bridging hydroxyl groups (Si-OH-Al). These sites have been investigated spectr...
Naoki Asakawa
Journal of Fiber Science and Technology   72 463   Jan 2016
Ryota Maruyama, Naoki Asakawa
Key Engineering Materials   698 19-26   Jan 2016
© 2016 Trans Tech Publications, Switzerland. A control and utilizability of spatial fluctuations in polymer capacitors using immiscible binary mixtures are described. The spatial flucuations for the device elements are of particular important for ...
Ryota Maruyama, Naoki Asakawa
Journal of Physics D: Applied Physics   47    Sep 2014
A design of a bio-inspired signal/information processing device and the fabrication of a stochastic delay-derivative element (SDDE) using an immiscible polymer binary mixture of poly(L-lactic acid) with poly(ε-caprolactone) are described. A functi...
Naoki Asakawa, Koichiro Umemura, Shinya Fujise, Koji Yazawa, Tadashi Shimizu, Masataka Tansho, Teruo Kanki, Hidekazu Tanaka
Journal of Nanophotonics   8    Jan 2014
Stochastic threshold devices using a trap-filling transition (TFT) coupled with molecular dynamics in poly(3-alkylthiophene)s were fabricated as potential key devices for noise-driven bioinspired sensors and information processors. This article de...
Naoki Asakawa, Teruo Kanki, Hidekazu Tanaka
Proceedings of SPIE - The International Society for Optical Engineering   9055    Jan 2014
Stochastic threshold devices using trap-filling transition coupled with molecular dynamics in poly(3-alkyl thiophene)s [P3ATs] were fabricated as potential key devices for noise-driven bio-inspired sensors and information processors. This article ...
Naoki Asakawa, Ken Motokura, Tatsuaki Yashima, To Ru Koyama, Toshinori O-Nuki, Akimitsu Miyaji, Toshihide Baba
Journal of Physical Chemistry C   116 17734-17738   Aug 2012
Proton-exchanged Y zeolite (H-Y zeolite) has two types of bridging hydroxyl groups; one exists in the supercage and the other exists in the sodalitecage. The dynamic property of protons due to these hydroxyl groups was investigated by variable tem...
Naoki Asakawa, Toshiki Obata
Polymer Journal   44 855-862   Aug 2012
Two applications of quasi-static magnetic field gradients in nuclear magnetic resonance spectroscopy are discussed. The first application is conformon transport in the quasi-ordered -conjugated polymer, poly(4-methylthiazole-2,5-diyl). With the as...
Hajime Munakata, To Ru Koyama, Tatsuaki Yashima, Naoki Asakawa, Toshinori O-Nuki, Ken Motokura, Akimitsu Miyaji, Toshihide Baba
Journal of Physical Chemistry C   116 14551-14560   Jul 2012
The influence of temperature on the1H chemical shift due to hydroxyl groups in H+-exchanged any kind of zeolites (ZSM-5 type zeolites including silicalite, mordenite and Y zeolites) was examined by variable temperature1H magic-angle spinning nucle...
N. Asakawa, Y. Inoue, T. Yamamoto, R. Shimizu, M. Tansho, K. Yazawa
ACS Symposium Series   1077 161-178   Jan 2011
Stochastically excitable threshold units using functional materials will potentially be among the key devices for the production of noise-driven bio-inspired sensors and information processors with ultra-low energy consumption. In particular, a no...
Koji Yazawa, Naoki Asakawa
Kobunshi Ronbunshu   68 11-23   Jan 2011
The molecular structure and dynamics of regioregulated poly(3- butylthiophene)(P3BT) and poly(3-hexylthiophene) (P3HT) were investigated using Fourier transfer infrared spectroscopy and high-resolution solid-state13C nuclear magnetic resonance (NM...
Teruo Kanki, Yasushi Hotta, Naoki Asakawa, Tomoji Kawai, Hidekazu Tanaka
Applied Physics Letters   96    Jun 2010
We demonstrated signal transmission using the nonlinearity of VO2in the manner of stochastic resonance (SR). A correlated insulator state of VO2changes nonlinearly to a metallic state when an applied bias voltage increases beyond a threshold. The ...
Koji Yazawa, Yoshio Inoue, Tadashi Shimizu, Masataka Tansho, Naoki Asakawa
Journal of Physical Chemistry B   114 1241-1248   Jan 2010
The molecular structure and dynamics of regioregulated poly(3- hexylthiophene) (P3HT) were investigated using high-resolution solid-state13C nuclear magnetic resonance (NMR) and optical absorption spectroscopies. A crystal (C)-plastic crystal (PC)...
Teruo Kanki, Yasushi Hotta, Naoki Asakawa, Tomoji Kawai, and Hidekazu Tanaka
Appl.Phys.Lett.   96 242108   2010
Koji Yazawa, Yoshio Inoue, Tadashi Shimizu, Masataka Tansho, and Naoki Asakawa
J.Phys.Chem.B   114 1241   2010
Takao Furuki, Taichi Ito, Naoki Asakawa, Yoshio Inoue, Minora Sakurai
Chemistry Letters   38 264-265   Jul 2009
We study effects of trehalose on the swelling behavior of hydrogel, exemplified here by agarose. Its volume increase on immersion into water is suppressed in the presence of disaeeharides, the extent of which lies in the order, sucrose < maltose <...
Kenichi Yamazaki, Tungalag Dong, Naoki Asakawa, Yoshio Inoue, Koji Yazawa
Macromolecular Rapid Communications   30 435-441   Mar 2009
A compositional graded film of poly(ε-caprolactone) (PCL) with 4,4′-thiodiphenol (TDP), in the film thickness direction, was fabricated by self-diffusing of TDP in the PCL melt. We found out the self-bending deformation of the gradient film, which...
Naoki Asakawa, Yasushi Hotta, Teruo Kanki, Tomoji Kawai, Hitoshi Tabata
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics   79(79) 021902   Feb 2009
Problems with artificial neural networks originate from their deterministic nature and inevitable prior learnings, resulting in inadequate adaptability against unpredictable, abrupt environmental change. Here we show that a stochastically excitabl...
Teruo Kanki, Toshio Kawahara, Naoki Asakawa, Yasushi Hotta, Yoshikazu Terai, Yasufumi Fujiwara, Hitoshi Tabata, Tomoji Kawai
Materials Research Society Symposium Proceedings   1034 86-90   Dec 2008
Spinel ferrite oxides doping non-magnetic ions show the photo-induced magnetization (PIM) effect at high temperature [1-3]. Such a magnetization enhancement by light irradiation is a unique property in this material. In order effectively to use th...
Koji Yazawa, Yoshio Inoue, Takakazu Yamamoto, Naoki Asakawa
Journal of Physical Chemistry B   112 11580-11585   Sep 2008
Solid-state structures of regioregulated poly(3-hexylthiophene) (P3HT) and poly(3-butylthiophene) (P3BT) were investigated using Fourier transform infrared absorption (FT-IR) spectroscopy. This study revealed that a twist glass transition of thiop...
Yasushi Hotta, Teruo Kanki, Naoki Asakawa, Hitoshi Tabata, Tomoji Kawai
Applied Physics Express   1 0880021-0880023   Aug 2008
We have investigated cooperative dynamics of an artificial stochastic resonant system, which is a recurrent ring connection of neuron-like signal transducers (NSTs) based on stochastic resonance (SR), using electronic circuit experiments. The ring...
Seiichiro Mori, Takakazu Yamamoto, Naoki Asakawa, Koji Yazawa, Yoshio Inoue
Polymer Journal   40 475-478   Jul 2008
A study was conducted to determine the dynamic structure of regio-regulated head-to-head HH-P4MeTz by differential scanning calorimetry (SDC) and NMR. The study synthesized regio-regulated polyheterocylic through dehalogenative organometallic poly...
Teruo Kanki, Yasushi Hotta, Naoki Asakawa, Munetoshi Seki, Hitoshi Tabata, Tomoji Kawai
Applied Physics Letters   92    May 2008
Room-temperature-photoinduced magnetization (PIM) was observed in spinel ferrite Al0.2 Ru0.8 Fe2 O4 thin films with a spin-cluster-glass structure. Additionally, the films exhibited significant properties as spintronic materials, showing a low sat...
Satoshi Koide, Naoki Asakawa, Yoshio Inoue, Koji Yazawa
Macromolecular Chemistry and Physics   209 499-507   Mar 2008
A mechanism for the generation of the compositional gradient along the long axis for poly(ε-caprolactone) (PCL)/poly(ethylene oxide) (PEO) blend under uniaxial thermal gradient was proposed by observations of the convection of polymer using graphi...
Satoshi Koide, Koji Yazawa, Naoki Asakawa, Yoshio Inoue
Journal of Materials Chemistry   17 582-590   Feb 2007
Compositionally graded bulk materials of organic polymer blends were prepared by using non-equilibrium self-organization processes with a uniaxial thermal gradient (Bridgman method). The Bridgman method was firstly applied to prepare two kinds of ...
Naoki Asakawa, Yoshio Inoue
Polymer Preprints, Japan   55 4214-4215   Dec 2006
We have developed an instrument for dynamical imaging by NMR relaxation spectroscopy. We call "dynamical imaging" a imaging method for dynamical properties such as spectrum density function of local magnetic field fluctuation or the spatio-tempora...
Michi Okonogi, Akiko Mori, Naoki Asakawa, Kazuo Yamauchi, Tetsuo Asakura
Polymer Preprints, Japan   55 1830   Oct 2006
To analyze the heterogeneous β-sheet structure of Samia cynthia ricini silk fiber in detail, structural analysis of alanine oligomers with either parallel(P) or anti-parallel(AP) β-sheet structures was performed using solid-state NMR. The T1 value...
Koji Yazawa, Naoki Asakawa, Takakazu Yamamoto, Yoshio Inoue
Polymer Preprints, Japan   55 730   Oct 2006
The molecular structure and dynamics of regioregulated poly(3- butylthiophene)(P3BT), poly(3-hexylthiophene) (P3HT), and poly(3- dodecylthiophene) (P3DDT) were investigated by Fourier transform infrared absorption (FTIR), solid state 13C nuclear m...
Satoshi Koide, Naoki Asakawa, Yoshio Inoue
Polymer Preprints, Japan   55 729   Oct 2006
We have prepared compositionally graded polymeric blend materials by using non-equilibrium self-organized processes with uniaxial thermal gradient (Bridgman method). This technique is firstly applied to prepare polymeric functionally graded materi...
Naoki Asakawa, Yoshio Inoue
Polymer Preprints, Japan   55 728   Oct 2006
Nuclear magnetic resonance(NMR) spectroscopy under inhomogeneous magnetic field is one of promising nondestructive methods for investigating transport phenomena. In the poster presentation we describe a development of an NMR dynamical imaging spec...
Koji Yazawa, Yoshio Inoue, Takakazu Yamamoto, Naoki Asakawa
Physical Review B - Condensed Matter and Materials Physics   74    Oct 2006
The molecular structure and dynamics of regioregulated poly(3- butylthiophene) (P3BT), poly(3-hexylthiophene) (P3HT), and poly(3- dodecylthiophene) (P3DDT) were investigated using Fourier-transform infrared absorption (FTIR), solid-state C13 nucle...
Takakazu Yamamoto, Syun ichi Otsuka, Kimiyasu Namekawa, Hiroki Fukumoto, Isao Yamaguchi, Takashi Fukuda, Naoki Asakawa, Takeshi Yamanobe, Takeshi Shiono, Zhengguo Cai
Polymer   47 6038-6041   Aug 2006
New five-membered ring π-conjugated polymers composed of 2,2′-bithiophene and 4,4′-dialkyl-2,2′-bithiazole units were prepared. The polymers were soluble in 1,2-dichlorobenzene and showed a UV-vis peak at about 490 nm above 120 °C. Cooling the sol...
Tomonori Honma, Li Zhao, Naoki Asakawa, Yoshio Inoue
Macromolecular Bioscience   6 241-249   Mar 2006
Poly(ε-caprolactone) (PCL)/chitin and PCL/chitosan blend films with compositional gradients were successfully fabricated by a dissolution/diffusion method; that is, repeatedly pouring the PCL/chitin (or PCL/chitosan) blend solutions, with variable...
Bo Zhu, Yong He, Naoki Asakawa, Haruo Nishida, Yoshio Inoue
Macromolecules   39 194-203   Jan 2006
The crystalline structure of biodegradable poly(3-hydroxypropionate) (PHP) has been found to quite depend on the molecular weight (MW) and crystallization conditions. In particular, a new crystal form (the δ-form) has been successfully prepared by...
Manabu Ohira, Naoki Asakawa, Takakazu Yamamoto, Yoshio Inoue
Polymer Preprints, Japan   54 730   Dec 2005
Dynamics of Yamamoto-type poly(p-phenylene) [PPP] was investigated by differential scanning calorimetry(DSC) and proton solid-state NMR relaxation spectroscopy. The DSC chart shows the baseline jump without latent heat at 295K, which is due to the...
Koji Yazawa, Naoki Asakawa, Takakazu Yamamoto, Yoshio Inoue
Polymer Preprints, Japan   54 3103-3104   Dec 2005
The molecular structure and dynamics of regioregular poly(3-alkylthiophene) (P3AT) were investigated. In DSC measurements,the endothermal peak was obtained around 60°C. The FTIR spectrum also showed the peak shift from 825cm -1 and 810cm-1 to 820c...
Seiichiro Mori, Naoki Asakawa, Takakazu Yamamoto, Yoshio Inoue
Polymer Preprints, Japan   54 1217   Dec 2005
The dynamics of regioregulated poly(4-methylthiazole-2,5-diyl) [HH-P4MeTz] was investigated by solid-state 1H, 2D, 13C NMR spectroscopies, and differential scanning calorimetry(DSC) measurements. DSC, 2D quadrupolar echo NMR, 13C cross-polarizatio...
Naoki Asakawa, Seiichiro Mori, Takakazu Yamamoto, Yoshio Inoue
Polymer Preprints, Japan   54 3680   Dec 2005
Nuclear magnetic resonance(NMR) spectroscopy under inhomogeneous magnetic field is one of promising nondestructive methods for investigating transport phenomena. In solids the diffusion coefficient can often be small and a local internal MFG, whic...
Bayar Hexig, Hexig Alata, Naoki Asakawa, Yoshio Inoue
Advanced Functional Materials   15 1630-1634   Oct 2005
A biodegradable, immiscible poly(butylenes adipate-co-butylenes terephthalate) [P(BA-co-BT)]/poly(ethylene oxide) (PEO) polymer blend film with compositional gradient in the film-thickness direction has been successfully prepared in the presence o...
Bo Zhu, Yong He, Naoki Asakawa, Naoko Yoshie, Haruo Nishida, Yoshio Inoue
Macromolecules   38 6455-6465   Jul 2005
Using wide-angle X-ray diffraction, high-resolution solid-state 13C NMR (SNMR), attenuated total reflection infrared (ATR/IR), and Fourier transform infrared (FTIR) spectrometry, we investigated the crystalline structure and morphology of melt-cry...
Naoki Asakawa, Kiyohiko Matsubara, Yoshio Inoue
Chemical Physics Letters   406 215-221   Apr 2005
Lattice diffusion and internal local magnetic field gradients in solids are investigated by numerical simulation of nuclear mangetic resonance spin echo experiments. The Fourier-spectrum method is employed in order to solve the Bloch-Torrey equati...
Bo Zhu, Yong He, Naoki Asakawa, Naoko Yoshie, Haruo Nishida, Yoshio Inoue
Macromolecular Rapid Communications   26 581-585   Apr 2005
A new crystal morphology (δ form) of poly(3-hydroxypropionate) (PHP) is found in cast and melt-crystallized PHPs with low molecular weight, in which the PHP chains possibly adopt a 21 helix rather than the trans conformation found in the β or γ fo...
Kazuki Ishida, Naoki Asakawa, Yoshio Inoue
Macromolecular Symposia   224 47-57   Apr 2005
This article describes the relationships between not only comonomer-unit compositions but also their distributions and structures as well as properties for bacterial copoly(hydroxyalkanoate)s, including poly(3hydroxybutyrate-co-3- hydroxyvalerate)...
B. Hexig, H. Alata, N. Asakawa, Y. Inoue
Journal of Polymer Science, Part B: Polymer Physics   43 368-377   Feb 2005
Biodegradable poly(butylene succinate) (PBS)/poly(ethylene oxide) (PEO) polymer blend film with compositional gradient in the film thickness direction was prepared using a method of interdiffusion across the interface between the PBS and PEO layer...
Seiichiro Mori, Yoshio Inoue, Takakazu Yamamoto, Naoki Asakawa
Physical Review B - Condensed Matter and Materials Physics   71    Feb 2005
The dynamics of regioregulated poly(4-methylthiazole-2,5-diyl) (HH-P4MeTz) was investigated by solid-state1H,2D, and13C NMR spectroscopies, and differential scanning calorimetry (DSC) measurements. DSC,2D quadrupolar echo NMR,13C cross-polarizatio...
Kai Weihua, Yong He, Naoki Asakawa, Yoshio Inoue
Journal of Applied Polymer Science   94 2466-2474   Dec 2004
The effect of lignin fine powder, as a new kind of nucleating agent, on the crystallization process of poly(3-hydroxybutyrate) (PHB) was studied. The kinetics of both isothermal and nonisothermal crystallization processes from the melt for both pu...
Bayar Hexig, Yong He, Naoki Asakawa, Yoshio Inoue
Journal of Polymer Science, Part B: Polymer Physics   42 2971-2982   Aug 2004
Miscibility and hydrogen bonding interaction have been investigated for the binary blends of poly(butylene adipate-co-44 mol % butylene terephthalate)[P(BA-co-BT)] with 4,4′-thiodiphenol (TDP) and polyethylene- oxide)(PEO) with TDP; and the ternar...
Bo Zhu, Yong He, Naoko Yoshie, Naoki Asakawa, Yoshio Inoue
Macromolecules   37 3257-3266   May 2004
The effect of intermolecular hydrogen bonding on the crystallization kinetics and the morphology of poly(e-caprolactone) (PCL)/4,4′- thiodiphenol (TDP) blends with TDP content 0-20 wt % has been investigated by differential scanning calorimetry, p...
Naoki Asakawa
Journal of Molecular Structure: THEOCHEM   675 29-35   Apr 2004
A novel method for accurate determination of small chemical shielding anisotropy (CSA) of the solid state nuclear magnetic resonance is described. The method is based on the adiabatically ramped spin-locking of transverse magnetization. The equati...
Lidan Feng, Naoko Yoshie, Naoki Asakawa, Yoshio Inoue
Macromolecular Bioscience   4 186-198   Mar 2004
The comonomer-unit compositions and their distribution of as-produced bacterial copolyesters, including poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxy-butyrate-co-3-hydroxy propionate), poly(3-hydroxybutyrate-co-3- hydroxyhexanoate) ...
Yang Ho Na, Yong He, Naoki Asakawa, Naoko Yoshie, Yoshio Inoue
Macromolecules   35 727-735   Jan 2002
The miscibility and phase behavior of poly(ethylene oxide) (PEO) blends with poly(3-hydroxybutyrate) (P(3HB)), poly(3-hydroxypropionate) (P(3HP)), and poly(3-hydroxybutyrate-co-3-hydroxypropionate)s (P(3HB-co-3HP)s) have been investigated by diffe...
Naoki Asakawa, Tatsuo Kajikawa, Kohei Sato, Minoru Sakurai, Yoshio Inoue, Takakazu Yamamoto
Journal of Molecular Structure   602-603 455-461   Jan 2002
This paper describes two topics concerned with anisotropic molecular diffusion in a single crystal of stearic acid (SA) and measurements of local magnetic field gradient (MFG) in a powdered film of regio-regulated poly(4-methylthiazole-2,5-diyl)(H...
Y. Wang, S. Yamada, N. Asakawa, T. Yamane, N. Yoshie, Y. Inoue
Biomacromolecules   2 1315-1323   Dec 2001
The comonomer compositional distribution and thermal and morphological characteristics were investigated for five bacterially synthesized poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] samples with 3HV content of 45, 49, 70, 80, and ...
Yong He, Naoki Asakawa, Jianchun Li, Yoshio Inoue
Journal of Applied Polymer Science   82 640-649   Oct 2001
The effects of low molecular weight compounds with hydroxyl groups on the properties of poly(L-lactic acid) (PLLA) were investigated. The specific interaction between PLLA and 4,4′-thiodiphenol (TDP) was investigated by Fourier transform IR spectr...
K. Ohno, N. Kamiya, N. Asakawa, Y. Inoue, M. Sakurai
Journal of the American Chemical Society   123 8161-8162   Oct 2001
M. Shiozawa, M. Yoda, N. Kamiya, N. Asakawa, J. Higo, Y. Inoue, M. Sakurai
Journal of the American Chemical Society   123 7445-7446   Oct 2001
Ken Ichi Akao, Yusei Okubo, Naoki Asakawa, Yoshio Inoue, Minoru Sakurai
Carbohydrate Research   334 233-241   Aug 2001
FTIR spectra were obtained for several different states of trehalose including dihydrate crystal, anhydrous form II (designated by Gil, A. M.; Belton, P. S.; Felix V. Spectrochim. Acta 1996, A52, 1649-1659), anhydrate crystal, dried melt, amorphou...
Xintao Shuai, Yong He, Naoki Asakawa, Yoshio Inoue
Journal of Applied Polymer Science   81 754-761   Aug 2001
Maleinization followed by silylation of low molecular weight guayule rubber was accomplished for the first time via a two-step process. Maleinization was first effected by grafting maleic anhydride onto guayule rubber under the influence of benzoy...
Yang Ho Na, Yousuke Arai, Naoki Asakawa, Naoko Yoshie, Yoshio Inoue
Macromolecules   34 4834-4841   Jul 2001
Bacterially synthesized poly(3-hydroxybutyrate-co-3-hydroxypropionate) [P(3HB-co-3HP)] samples were compositionally fractionated using solvent/nonsolvent fractionation techniques. Binary blends between these compositionally fractionated P(3HB-co-3...
K. Ohno, N. Kamiya, N. Asakawa, Y. Inoue, M. Sakurai
Chemical Physics Letters   341 387-392   Jun 2001
We propose an integrated MOZYME+DFT method for calculation of the pKa values of ionizable residues in a protein. The method is applied to two protein systems, bacteriorhodopsin (bR) and ribonuclease T1. It is shown that the present method reproduc...
Shino Yamada, Yi Wang, Naoki Asakawa, Naoko Yoshie, Yoshio Inoue
Macromolecules   34 4659-4661   Jun 2001
The crystalline structural changes of bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with narrow compositional distribution were investigated. The investigations were performed using differential scanning calorimetry (DSC) and wide-angle X...
Yong He, Naoki Asakawa, Yoshio Inoue
Macromolecular Chemistry and Physics   202 1035-1043   May 2001
The formation of the inter-associated hydrogen bond between poly(ε-caprolactone (PCL) and 4,4′-thiodiphenol (TDP) was investigated as a function of composition and temperature by temperature variable Fourier transform infrared spectroscopy. It was...
Takumi Watanabe, Yong He, Naoki Asakawa, Naoko Yoshie, Yoshio Inoue
Polymer International   50 463-468   Apr 2001
The specific interactions between several low-molecular-weight diamino compounds and poly (ε-caprolactone) (PCL) have been investigated by FT-IR. It was found that PCL and 3,3′-diaminodiphenylmethane (3,3′-DADPM) interact through strong intermolec...
Yong He, Naoki Asakawa, Yoshio Inoue
Polymer International   49 609-617   Dec 2000
The miscibility of high molecular weight poly(ethylene oxide) blends with poly(3-hydroxypropionic acid) and poly(3-hydroxybutyric acid) (P(3HB)) has been investigated by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis ...
Yong He, Naoki Asakawa, Yoshio Inoue
Journal of Polymer Science, Part B: Polymer Physics   38 2891-2900   Nov 2000
The specific interaction between poly(3-hydroxybutyrate) [P(3HB)] and 4,4′-thiodiphenol (TDP) and between poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and TDP was investigated by Fourier transform infrared (FTIR) spectroscopy. Interassociat...
Yong He, Naoki Asakawa, Takashi Masuda, Amin Cao, Naoko Yoshie, Yoshio Inoue
European Polymer Journal   36 2221-2229   Oct 2000
The solid-phase structure and biodegradability were investigated for a series of binary blends of bacterial poly(3-hydroxybutyrate) with chemosynthetic poly(butylene succinate-co-butylene adipate) (PBSA) and poly(butylene succinate-co-ε-caprolacto...
Yong He, Naoki Asakawa, Yoshio Inoue
Journal of Polymer Science, Part B: Polymer Physics   38 1848-1859   Jul 2000
The effects of several low molecular weight compounds with hydroxyl groups on the physical properties of poly(ε-caprolactone) (PCL) were investigated by Fourier transform infrared (FTIR) spectroscopy and high-resolution solid-state 13C NMR. PCL an...
Naoki Asakawa, Daisuke Sato, Minoru Sakurai, Yoshio Inoue
Journal of Physical Chemistry A   104 2716-2723   Jan 2000
Local structure of phospholipid/amine polyion complexes in lyophilized powders of dipalmitoylphosphatidic acid(DPPA)/poly-L-lysine(pLYS) and DPPA/poly-L-arginine(pARG) is investigated by solid-state nuclear magnetic resonance spectroscopy. The int...
Minoru Sakurai, Mitsuhito Wada, Hirohiko Houjou, Naoki Asakawa, Yoshio Inoue
ACS Symposium Series   732 148-161   Dec 1999
The chromophores of rhodopsin and bacteriorhodopsin are 11-cis-and all-trans-retinal Schiff bases, respectively. Upon binding to the proteins, their unsaturated carbons show anomalous13C chemical shifts compared with those of corresponding model c...
Naoki Asakawa, Masatoshi Takenoiri, Daisuke Sato, Minoru Sakurai, Yoshio Inoue
Magnetic Resonance in Chemistry   37 303-311   Apr 1999
Analyses of13C chemical shielding tensors for powder samples of α-helix-rich poly-L-alanine (pALA) and the mechanically stretched β-sheet pALA films were performed by solid-state two-dimensional spin-echo (2DSE) NMR spectroscopy. From the iterativ...
Amin Cao, Naoki Asakawa, Naoko Yoshie, Yoshio Inoue
Polymer   40 3309-3322   Jan 1999
Solid structures of the compositionally fractionated bacterial poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)s [P(3HB-co-3HP)], bearing much narrower comonomer compositional distributions, were studied by high-resolution solid-state13C n.m...
Fumihiko Sano, Naoki Asakawa, Yoshio Inoue, Minoru Sakurai
Cryobiology   39 80-87   Jan 1999
It is well known that yeast cells survive environmental stresses such as desiccation and freezing and there is evidence that these phenomena may be related to the presence of trehalose in the cells. However, the molecular mechanism by which trehal...
Isao Ando, Naoki Asakawa, Graham A. Webb
Studies in Physical and Theoretical Chemistry   84 1-21   Dec 1998
N. Asakawa, N. Asakawa, T. Kameda, S. Kuroki, S. Kuroki, H. Kurosu, S. Ando, I. Ando, A. Shoji
Annual Reports on NMR Spectroscopy   35 55-137   Dec 1998
Isao Ando, Tsunenori Kameda, Naoki Asakawa
Studies in Physical and Theoretical Chemistry   84 819-851   Dec 1998
Renato Norio Shimizu, Naoki Asakawa, Isao Ando, Akihiro Abe, Hidemine Furuya
Magnetic Resonance in Chemistry   36    Jun 1998
The conformation around the Cε - Cε′, bond of the alkyl spacer of α,ω-bis[(4,4′-cyanobiphenylyl)oxy] decane (CBA-10) was evaluated in the solid and liquid crystalline states through the detection of the dipolar interaction between Cδ and Cδ′. CBA-...
Daisuke Sato, Naoki Asakawa, Minoru Sakurai, Yoshio Inoue
Journal of Physical Chemistry B   102 3073-3076   Apr 1998
A solid-state nuclear magnetic resonance (NMR) study for the structural elucidation of acidic phospholipid- basic polypeptide complex powder samples is presented.13C cross-polarization magic angle spinning (CP/ MAS) experiments of poly(L-lysine)/d...
Takakazu Yamamoto, Dharma Komarudin, Minoru Arai, Bang Lin Lee, Hajime Suganuma, Naoki Asakawa, Yoshio Inoue, Kenji Kubota, Shintaro Sasaki, Takashi Fukuda, Hiro Matsuda
Journal of the American Chemical Society   120 2047-2058   Mar 1998
Stacking of poly(3-alkylthiophene)s P3RThs and poly(4-alkylthiazole)s P4RTzs has been studied. Light scattering analysis indicates that head-to- tail (HT) type HT-P3HexTh (R = n-C6H13)gives a degree of depolarization (ρ(v)) of 0.26 in CHCl13, whic...
Isao Ando, Tsunenori Kameda, Naoki Asakawa, Shigeki Kuroki, Hiromichi Kurosu
Journal of Molecular Structure   441 213-230   Jan 1998
It is reviewed that through the observation of solid-state13C NMR chemcial shift, the main-chain conformation and hydrogen-bonded structure of peptides and proteins in the solid state have been successfully elucidated, and the combination of solid...
Takayuki Hanamura, Naoki Asakawa, Yoshio Inoue, Minoru Sakurai
Chemistry Letters   713-714   Jan 1998
While31P solid-state NMR experiments are being carried out for DPPC vesicles mixed with trehalose, the spectra exhibit sudden changes, implying that during dehydration the trehalose molecules bind to the head groups of lipids.
Amin Cao, Naoki Asakawa, Naoko Yoshie, Yoshio Inoue
Polymer Journal   30 743-752   Jan 1998
Two different aliphatic polyesters, bacterially synthesized polyester poly(3-hydroxybutyric acid) [P(3HB)] and chemically synthesized poly(3-hydoxypropionc acid) [P(3HP)], were blended via solvent casting. By differential scanning calorimetry, pol...
Hirohiko Houjou, Minoru Sakurai, Naoki Asakawa, Yoshio Inoue, Yusuke Tamura
Journal of the American Chemical Society   118 8904-8915   Sep 1996
The ab initio shielding calculations are carried out to investigate the conformation dependence of13C chemical shifts for conjugated compounds like the chromophore of a visual pigment rhodopsin (Rh). First, the calculations are applied systematica...
Amin Cao, Masafumi Ichikawa, Ken Ichi Kasuya, Naoko Yoshie, Naoki Asakawa, Yoshio Inoue, Yoshiharu Doi, Hideki Abe
Polymer Journal   28 1096-1102   Jan 1996
The compositional distribution has been investigated for poly(3-hydroxybutyrate-co-3-hydroxypropionate) [P(3HB-co-3HP)]s, which were microbially synthesized by Alcaligenes latus with 3-hydroxypropionic acid, sucrose or 3-hydroxybutyric acid as the...
Masafumi Ichikawa, Kazuhiro Nakamura, Naoko Yoshie, Naoki Asakawa, Yoshio Inoue, Yoshiharu Doi
Macromolecular Chemistry and Physics   197 2467-2480   Jan 1996
The solid-state structure of a bacterially synthesized copolyester, poly(3-hydroxybutyrate-co-3-hydroxypropionate), P(3HB-co-3HP), with the '3HP content ranging from 0 to 37 mol-%, was analyzed by13C solid-state high-resolution NMR, X-ray diffract...
Kaoru Tsuchiya, Akihiro Takahashi, Naoto Takeda, Naoki Asakawa, Shigeki Kuroki, Isao Ando, Akira Shoji, Takuo Ozaki
Journal of Molecular Structure   350 233-240   May 1995
13C cross polarization-magic angle spinning NMR spectra were measured for a series of peptides containing l-valine, l-leucine and l-aspartic acid residues, for which the crystal structures were already determined by X-ray diffraction, in order to ...
Naoki Asakawa, Hiromichi Kurosu, Isao Ando
Journal of Molecular Structure   323 279-285   Jul 1994
The correlation between the chemical shifts and the main-chain dihedral angles of peptides containing l-alanine residues are estimated by carrying out chemical shielding calculations using the coupled Hartree-Fock method with the gauge invariant a...
Naoki Asakawa, Hiromichi Kurosu, Isao Ando, Akira Shoji, Takuo Ozaki
Journal of Molecular Structure   317 119-129   Jan 1994
From the observation of solid-state13C NMR chemical shifts of l-alanine residues which are contained in some peptides, and the13C chemical shift calculations employing the coupled-Hartree-Fock method with gauge-invariant-atomic-orbital, it was fou...
Naoki Asakawa, Naoki Asakawa, Naoki Asakawa, Shigeki Kuroki, Shigeki Kuroki, Shigeki Kuroki, Hiromichi Kurosu, Hiromichi Kurosu, Hiromichi Kurosu, Isao Ando, Isao Ando, Isao Ando, Akira Shoji, Akira Shoji, Akira Shoji, Takuo Ozaki, Takuo Ozaki, Takuo Ozaki
Journal of the American Chemical Society   114 3261-3265   Apr 1992
In order to investigate the relationship between hydrogen-bond length and 13C NMR chemical shifts of L-alanine carbonyl carbons in peptides in the solid state, 13C CP-MAS NMR spectra were measured for a series of peptides containing L-alanine resi...
Shigeki Kuroki, Naoki Asakawa, Shinji Ando, Isao Ando, Akira Shoji, Takuo Ozaki
Journal of Molecular Structure   245 69-80   Apr 1991
CP-MAS and CP-static15N NMR spectra were measured for a variety of solid oligopeptides containing the glycine residue, the crystal structures of which had already been determined by X-ray diffraction. From the results of the observed15N chemical s...

Misc

 
Takao Furuki, Taichi Ito, Naoki Asakawa, Yoshio Inoue, and Minoru Sakurai
Chem.Lett.   38(3) 264   2009
Naoki Asakawa, Yoshio Inoue, Takakazu Yamamoto, Tadashi Shimizu, Masataka Tansho, and Koji Yazawa
ACS Book:NMR Spectroscopy of Polymers:Innovative NMR Strategies for Complex Macromolecular Systems   161-178   2011
Hajime Munakata, To-ru Koyama, Tatsuaki Yashima, Naoki Asakawa, Toshinori O-nuki, Ken Motokura, Akimitsu Miyaji, Toshihide Baba
Journal of Physical Chemistry C   116(27) 14551-14560   2012
Naoki Asakawa, Ken Motokura, Tatsuaki Yashima, To-ru Koyama, Toshinori O-nuki, Akimitsu Miyaji, and Toshihide Baba
Journal of Physical Chemistry C   116 17734-17738   2012
Fukuda, Kunito; Asakawa, Naoki
REVIEW OF SCIENTIFIC INSTRUMENTS   87(11) 113106   2016
Ryota Maruyama and Naoki Asakawa
Key Engineering Materials   698 19-26   2016
Spatio-Temporal Fluctualions in Binary Mixture of Polymer Thin Films
Ryota Maruyama and Naoki Asakawa
Proceedings of The 11th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications and The 7th International Conference on Advanced Micro-Device Engineering   8-35   2015
Noise-driven electronic device using polymer transistors
Yoshiharu Suzuki, Teruo KANKI, Hidekazu TANAKA, and Naoki ASAKAWA
Polymer Preprints   64 2PF046   2015
Fukuda, Kunito; Asakawa, Naoki
MACROMOLECULAR CHEMISTRY AND PHYSICS   219(3) 1700395   2018
Suzuki, Yoshiharu; Asakawa, Naoki
PHYSICAL REVIEW E   97(1) 12217   2018
Fukuda, Kunito; Asakawa, Naoki
JOURNAL OF PHYSICS D-APPLIED PHYSICS   50(5) 55102   2017
Suzuki, Yoshiharu; Matsubara, Kiyohiko; Asakawa, Naoki
APPLIED PHYSICS LETTERS   109(9) 93702   2016
Hayashi, Yoshihiro; Miyaji, Akimitsu; Motokura, Ken; Asakawa, Naoki; Baba, Toshihide
JOURNAL OF PHYSICAL CHEMISTRY C   120(17) 9207-9217   2016
Ryota Maruyama and Naoki Asakawa
Transactions of the Materials Research Society of Japan   41(1) 77-80   2016
Asakawa, Naoki; Umemura, Koichiro; Fujise, Shinya; Yazawa, Koji; Shimizu, Tadashi; Tansho, Masataka; Kanki, Teruo; Tanaka, Hidekazu
JOURNAL OF NANOPHOTONICS   8 83077   2014
Naoki Asakawa, Teruo Kanki, and Hidekazu Tanaka
Proceedings of SPIE   (9055) 905509   2014
Development of a measurement methodology for π-conjugated molecular electronic devices by a electron spin resonance instrument.
Kunito Fukuda and Naoki Asakawa
Polymer Preprints   64 1E07.   2015
Synapse-inspired one-directional signal transmission device using polymer transistors
Yoshiharu SUZUKI,Teruo KANKI,Hidekazu TANAKA,Naoki ASAKAWA
Polymer Preprints   63 1PE071   2014

Books etc

 
NMR Chemical Shift and Electronic Structure
Solid State NMR of PolymersSolid State NMR of Polymers   1998   
Polypeptides
Solid State NMR of PolymerSolid State NMR of Polymer   1998   
Nuclear Magnetic Resonance
The Royal Society of ChemistryThe Royal Society of Chemistry   2003   
Nuclear Magnetic Resonance
The Royal Society of ChemistryThe Royal Society of Chemistry   2004   

Conference Activities & Talks

 
Bio-inspired Stochastic Resonant Devices using Nanofibers
Proceedings of International Nanofiber Symposium 2009   2009   
Dynamics of disordered structure of pi-conjugated polymers investigated by solid-state NMR
PACIFICHEM2010   2010   
Solid-state NMR for polymer thin film devices
50th nmr meeting and ISNMR2011   2011   
An collaboration among NEDO grants for young scientists
SPSJ 60th Anniversary Polymer Expo 2012   2014   
Noise-driven signal/information transmission device using molecular dynamics of organic polymers
SPIE Smart Structures/NDE 2014   2014   

Research Grants & Projects

 
functionalization of bio-based polymers and bio-inspired information processors using emergent property found in polymers
Grant-in-Aid for Scientific Research
Project Year: 2009