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Light(Science & Applications) 2013年第1期2卷 1-8页

作者： Quan Sun Kosei Ueno Han Yu Atsushi Kubo yasutaka matsuo Hiroaki Misawa Research Institute for Electronic Science Hokkaido UniversitySapporo 001-0021Japan Creative Research Institution Hokkaido UniversitySapporo 001-0021Japan PRESTO Japan Science and Technology AgencyKawaguchi 332-0012Japan Institute of Physics University of TsukubaTsukuba 305-8571Japan

Localized surface plasmon resonance(LSPR)can be supported by metallic nanoparticles and engineered *** understanding of the spatially resolved near-field properties and dynamics of LSPR is important,but remains experimentally *** report experimental studies toward this aim using photoemission electron microscopy(PEEM)with high spatial resolution of sub-10 *** engineered gold nanostructure arrays(such as rods,nanodisk-like particles and dimers)are investigated via PEEM using near-infrared(NIR)femtosecond laser pulses as the excitation *** the LSPR wavelengths overlap the spectrum of the femtosecond pulses,the LSPR is efficiently excited and promotes multiphoton photoemission,which is correlated with the local intensity of the metallic nanoparticles in the near ***,the local field distribution of the LSPR on different Au nanostructures can be directly explored and discussed using the PEEM *** addition,the dynamics of the LSPR is studied by combining interferometric time-resolved pump-probe technique and *** information on the oscillation and dephasing of the LSPR field can be *** results identify PEEM as a powerful tool for accessing the near-field mapping and dynamic properties of plasmonic nanostructures.

关键词： femtosecond laser local field enhancement near-field imaging photoemission electron microscopy surface plasmon resonance

STRIPE PATTERN FORMATION OF STRETCHED SINGLE DNA MOLECULES BY LB METHOD

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STRIPE PATTERN FORMATION OF STRETCHED SINGLE DNA MOLECULES B...

Revealing the plasmon coupling in gold nanochains directly from the near field

Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： yasutaka matsuo KUNIHARU IJIRO Research Institute for Electronic Science Hokkaido University Kita21-Nishi10Kita-kuSapporoHokkaido001-0021JAPAN Research Institute for Electronic Science Hokkaido University Kita21-Nishi10Kita-kuSapporoHokkaido001-0021JAPAN

＜正＞ Nanoscopic or microscopic structures consisted of polymers and particles can be fabricated by using several methods for various applications such as photonic devices, electronic devices and biological analysis systems. One of the methods is microcontact printing （·-CP） based on photolithography. A contrary method is a self-organization method which is a simple technique and whose cost is low. The Langmuir-Blodgett （LB） technique is a strong tool to prepare multi layered structures of Langmuir monolayers. Recently the LB technique has been used to assemble nanorods and fabricate chemically patterned thin films. We have reported that DNA molecules were stretched and immobilized on a solid substrate at relatively low surface pressure and slow dipping speed by the LB method. In this report, a two-dimensional pattern formation of stretched DNA molecules formed in LB films was investigated. A polyion complex monolayer of DNA molecules and a cationic amphiphile spread on a TE buffer solution of plasmid DNA was transferred on a glass substrate by the LB method. Fluorescence images of the transferred polyion complex monolayers showed stripe patterns of the plasmid DNA molecules stained by a fluorescent dye. The stripe patterns of DNA molecules were parallel to the dipping direction of the substrates. In addition, the stripe pattern was observed in detail by a scanning near-field optical microscope （SNOM, SⅡNanotechnology Inc. SPA300）. The stripe pattern consisted of straight fluorescent lines that were parallel to the dipping direction. A length of the straight fluorescent line was consistent with that of the plasmid DNA molecule. Therefore the plasmid DNA molecules were stretched in the stripe pattern of the LB film. The pattern formation mechanism will be discussed.

关键词： Stretched DNA Langmuir-Blodgett method pattern formation.

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Opto-Electronic Advances 2019年第4期2卷 1-7页

作者： Quan Sun Han Yu Kosei Ueno Shuai Zu yasutaka matsuo Hiroaki Misawa Research Institute for Electronic Science Hokkaido University Sapporo 001-0021 Japan College of Electronic Science and Engineering Jilin University Changchun 130012 China

We studied the near-field properties of localized surface plasmon resonances in finite linear gold nanochains using photoemission electron microscopy(PEEM).The localization of the electromagnetic field in the near-field region was mapped at high spatial *** tuning the excitation laser wavelength,we can obtain the near-field spectra,from which the energy splitting between longitudinal(L)and transverse(T)plasmon modes can be *** particular,the L-mode red shifts and the T-mode blue shifts with increasing chain *** red shift of the L-mode is highly dependent on the gap *** contrast,the T-mode almost remains constant within the range of gap distance we *** energy splitting between the L-mode and the T-mode of metallic chains is in agreement with previous far-field measurements,where it was explained by dipole-dipole near-field ***,we provide direct proof of this near-field plasmon coupling in nanochains via the above-described near-field measurements using *** addition,we explore the energy transport along the gold nanochains under excitation at oblique illumination via PEEM measurements together with numerical simulations.

关键词： surface plasmon resonance metallic nanochains near-field imaging photoemission electron microscopy

FABRICATION OF SILVER NANOWIRES BY ELECTROLESS PLATING OF DNA

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FABRICATION OF SILVER NANOWIRES BY ELECTROLESS PLATING OF DN...

Natural Convection Melting in a Rectangular Heat Storage Tank of Carbon Nanotube Dispersed Latent Heat Storage Material

Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： KUNIHARU IJIRO yasutaka matsuo YUICHI HASHIMOTO Research Institute for Electronic Science Hokkaido UniversitySapporo 001-0021Japan Research Institute for Electronic Science Hokkaido UniversitySapporo 001-0021Japan Graduate School of Science Hokkaido University Sapporo 001-0021Japan

＜正＞ The precise metallization of double-stranded DNA by the selective electroless plating method was investigated for the purpose of the fabrication of nano wires. Cis-platin was bound to template DNA molecules and reduced to platinum which can catalyze following silver metal deposition. We have found that when DNA-amphiphile polyion complex mono layer, which was formed at the air-water interface, was transferred to a glass substrate by using the Langmuir-Blodgett （LB） method, DNA molecules could be immobilized and stretched on the glass substrate （Figure 1.）1,2. The DNA molecules combined with the platinum particles was also stretched and immobilized on a glass substrate by using the LB method. The electroless plating of the platinum-bound DNA molecules immobilized on the substrate by reduction of silver ion gave uniform silver nanowires （c.a. 50nm in width and height） along the stretched DNA structures （Figure 2.）. On the contrary, the electroless plating of DNA molecules without the catalyst provided inhomogeneous silver deposition. Conductive AFM measurement revealed that the obtained silver nanowires as long as several mm had high conductivities.

关键词： DNA nanowire LB film.

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Journal of Thermal Science 2024年第3期33卷 847-855页

作者： Shin-ichi MORITA Tomoya SAITO Kazunori TAKAI yasutaka HAYAMIZU Naoto HARUKI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer

Poly(ethylenimine)-assisted synthesis of hollow carbon spheres comprising multi-sized Ni species for CO_(2)electroreduction

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Chinese Journal of Catalysis 2024年第9期64卷 66-76页

作者： Kaining Li yasutaka Kuwahara Hiromi Yamashita Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka University2‐1 Yamada‐okaOsaka 565‐0871Japan Innovative Catalysis Science Division Institute for Open and Transdisciplinary Research Initiatives(OTRI)Osaka University2‐1 Yamada‐okaSuitaOsaka 565‐0871Japan

Electrochemical CO_(2)reduction to produce value-added chemicals and fuels is one of the research hotspots in the field of energy *** development of efficient catalysts with high conductivity and readily accessible active sites for CO_(2)electroreduction remains challenging yet *** this work,a reliable poly(ethyleneimine)(PEI)-assisted strategy is developed to prepare a hollow carbon nanocomposite comprising a single-site Ni-modified carbon shell and confined Ni nanoparticles(NPs)(denoted as Ni@NHCS),where PEI not only functions as a mediator to induce the highly dispersed growth of Ni NPs within hollow carbon spheres,but also as a nitrogen precursor to construct highly active atomically-dispersed Ni-Nx *** from the unique structural properties of Ni@NHCS,the aggregation and exposure of Ni NPs can be effectively prevented,while the accessibility of abundant catalytically active Ni-Nx sites can be *** a result,Ni@NHCS exhibits a high CO partial current density of 26.9 mA cm^(-2)and a Faradaic efficiency of 93.0%at-1.0 V ***,outperforming those of its PEI-free *** from the excellent activity and selectivity,the shell confinement effect of the hollow carbon sphere endows this catalyst with long-term *** findings here are anticipated to help understand the structure-activity relationship in Ni-based carbon catalyst systems for electrocatalytic CO_(2)***,the PEI-assisted synthetic concept is potentially applicable to the preparation of high-performance metal-based nanoconfined materials tailored for diverse energy conversion applications and beyond.

关键词： Hollow carbon sphere Ni nanoparticle CO_(2)reduction Electrocatalysis Single-atom catalyst

High performance micromachining of sapphire by laser induced plasma assisted ablation(LIPAA)using GHz burst mode femtosecond pulses

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Opto-Electronic Science 2024年第6期3卷 20-29页

作者： Kotaro Obata Shota Kawabata yasutaka Hanada Godai Miyaji Koji Sugioka RIKEN Center for Advanced Photonics(RAP) Wako-shiSaitama 351-0198Japan Faculty of Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyo 184-8588Japan Graduate School of Science and Technology Hirosaki UniversityHirosakiAomori 036-8561Japan

GHz burst-mode femtosecond(fs)laser,which emits a series of pulse trains with extremely short intervals of several hundred picoseconds,provides distinct characteristics in materials processing as compared with the conventional irradiation scheme of fs laser(single-pulse mode).In this paper,we take advantage of the moderate pulse interval of 205 ps(4.88 GHz)in the burst pulse for high-quality and high-efficiency micromachining of single crystalline sapphire by laser induced plasma assisted ablation(LIPAA).Specifically,the preceding pulses in the burst generate plasma by ablation of copper placed behind the sapphire substrate,which interacts with the subsequent pulses to induce ablation at the rear surface of sapphire *** a result,not only the ablation quality but also the ablation efficiency and the fabrication resolution are greatly improved compared to the other schemes including single-pulse mode fs laser direct ablation,single-pulse mode fs-LIPAA,and nanosecond-LIPAA.

关键词： femtosecond laser GHz burst mode ablation LIPAA laser induced plasma assisted ablation sapphire

Experimental Study on Load Characteristics in a Floating Type Pendulum Wave Energy Converter

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Journal of Thermal Science 2014年第5期23卷 465-471页

作者： Tengen Murakami yasutaka Imai Shuichi Nagata Institute of Ocean Energy Saga University

A floating type pendulum wave energy converter(FPWEC) with a rotary vane pump as the power take-off system was proposed by Watabe et *** *** showed that this device had high energy conversion *** the previous research,the authors conducted 2D wave tank tests in regular waves to evaluate the generating efficiency of FPWEC with a power take-off system composed of pulleys,belts and a *** a result,the influence of the electrical load on the generating efficiency was ***,the load characteristics of FPWEC are pursued experimentally by using the servo motors to change the damping coefficient in this *** a later part of this paper,the motions of the model with the servo motors are compared with that of the case with the same power take-off system as the previous *** the above experiment,it may be concluded that the maximum primary conversion efficiency is achieved as high as 98%at the optimal load.

关键词： pendulum wave energy converter floating type load characteristics primary conversion efficiency

The Study of Latent Heat Transport Characteristics by Solid Particles and Saccharide Solution Mixtures

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Journal of Thermal Science 2011年第2期20卷 155-160页

作者： Shin-ichi MORITA yasutaka HAYAMIZU Hideo INABA Department of Mechanical Engineering Yonago National College of Technology Tsuyama National College of Technology

The purpose of this study is the development of latent heat transport system by using the mixture of the minute latent heat storage materials and the saccharine solution as medium. The experimental studies are carried out by the evaluation of viscosity and pressure loss in a pipe. Polyethylene (P.E.) is selected as the dispersed minute material that has closeness density (920kg/m3) of ice (917kg/m3). D-sorbitol and D-xylose solutions are picked as continuum phase of the test mixture. The concentration of D-sorbitol solution is set 48mass% from measured results of saturation solubility and the melting point. 40mass% solution of D-xylose is selected as the other test continuum phase. The non-ion surfactant, EA157 Dai-ichiseiyaku CO. Ltd, is used in order to prevent of dispersed P.E. powder cohere. The pressure loss of test mixture is measured by the straight circular pipe that has smooth inner surface. The measuring length for pressure loss is 1000 mm, and the inner diameter of pipe is 15mm. The accuracy of experiment apparatus for measuring pressure loss is within ±5%. The pressure loss data is estimated by the relationship between the heat transport ratio and the required pump power. It is clarified that the optimum range of mixing ratio exists over 10mass% of latent heat storage material.

关键词： Latent heat transport Heat storage Multiphase flow

Heat Transfer Efficiency Evaluation for Outward and Inward Multi-Flame-Hole Gas Burner

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Journal of Thermal Science 2012年第2期21卷 189-195页

作者： Shin-ichi MORITA yasutaka HAYAMIZU Takashi KATAYAMA Hideo INABA Department of Mechanical Engineering Yonago National College of Technology 4448 Hikona-cho Yonago city Tottori 683-8502 Japan Department of System Production Engineering Yonago National College of Technology Advanced Course 4448 Hikona-cho Yonago city Tottori 683-8502 Japan Tsuyama National College of Technology 624-1 Numa Tsuyama city Okayama 708-8509 Japan

The purpose of this study is to understand the factor that influence the heating efficiency of the outward and inward multi-hole gas burner. The flame-hole angle and the distance from flame hole to heating object are chosen as the experimental parameters. The measurement of the flame temperature distribution is carried out on each experimental condition. The observation of combustion flame, by the Schlieren method, is done from the purpose to understand the combustion phenomenon on the heating efficiency. LPG (Liquefied petroleum gas) is used for the test fuel gas. The compositions of LPG are propane 97.5vol%, butane 0.2vol% and methane + ethylene 2.3vol%. The optimum ranges of the flame-hole angle and the distance from flame hole to heating object are clarified. The experimental correlation equations for the outward and inward multi-flame-hole gas burner are proposed.

关键词： Burner Heat Transfer Design Thermal Efficiency Energy Saving