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Ionic Liquid-Stabilized Single-Atom Rh Catalyst Against Leaching

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CCS Chemistry 2021年第10期3卷 1814-1822页

作者： Shipeng Ding Max JHülsey Hua An Qian He hiroyuki asakura Min Gao Jun-ya Hasegawa Tsunehiro Tanaka Ning Yan Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585 Joint School of the National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207 Department of Materials Science and Engineering National University of SingaporeSingapore 117575 Department of Molecular Engineering Graduate School of EngineeringJapan and Elements Strategy Initiative for Catalysts and Batteries(ESICB)Kyoto UniversityKyoto 615-8510615-8245 Institute for Catalysis Hokkaido UniversitySapporo 001-0021

Single-atom catalysts(SACs)are promising in some reactions typically promoted by homogeneous ***,the leaching of active species from the support in liquid-phase reactions hinders their potential ***,taking the hydroformylation reaction as an example,we report ionic liquid(IL)-induced stabilization of single Rh atoms against *** the ILs examined.

关键词： single-atom catalysts electrostatic stab ilization ionic liquid leaching

Identifying Key Descriptors for the Single-Atom Catalyzed CO Oxidation

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CCS Chemistry 2022年第10期4卷 3296-3308页

作者： Max J.Hülsey Sambath Baskaran Shipeng Ding Sikai Wang hiroyuki asakura Shinya Furukawa Shibo Xi Qi Yu Cong-Qiao Xu Jun Li Ning Yan Department ofChemicalandBiomolecularEngineering NationalUniversityofSingaporeSingapore 117585 Department of Chemistry Southern University of Science and TechnologyShenzhen 518055 Joint School of National University of Singapore Tianjin UniversityInternational Campus of Tianjin UniversityBinhai New CityFuzhou 350207 Department of Molecular Engineering Graduate School of EngineeringKyoto UniversityKyoto 615-8510615-8245 Elements Strategy Initiative for Catalysts and Batteries(ESICB) Kyoto UniversityKyoto 615-8245 Institute for Catalysis Hokkaido UniversitySapporo 001-0021 Institute for Chemical and Engineering Sciences Agency for ScienceTechnologyand Research in SingaporeSingapore 138634 Shaanxi Key Laboratory of Catalysis Shaanxi University of TechnologyHangzhou 723001 Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of EducationTsinghua UniversityBeijing 100084

Fundamental knowledge of structure-activity correlations for heterogeneous single-atom catalysts(SACs)is essential in guiding catalytic *** linear scaling relations are powerful for predicting the performance of traditionalmetal catalysts,they appear to fail with the involvement of *** the catalytic CO oxidation activity of different atomically dispersed metals(3d,4d,and 5d)in conjunction with computational modeling enabled us to establish multiple scaling relations between the activity and simply calculated descriptors.

关键词： scaling relations transition metals carbon monoxide single-site catalysts polyoxometalate

Utility of plasma D-dimer for diagnosis of venous thromboembolism after hepatectomy

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World Journal of Clinical Cases 2024年第2期12卷 276-284页

作者： Taiichiro Miyake Hiroaki Yanagimoto Daisuke Tsugawa Masayuki Akita Riki asakura Keisuke Arai Toshihiko Yoshida Shinichi So Jun Ishida Takeshi Urade Yoshihide Nanno Kenji Fukushima Hidetoshi Gon Shohei Komatsu Sadaki Asari Hirochika Toyama Masahiro Kido Tetsuo Ajiki Takumi Fukumoto Division of Hepato-Biliary-Pancreatic Surgery Department of SurgeryKobe University Graduate School of MedicineKobe 650-0017HyogoJapan

BACKGROUND Venous thromboembolism(VTE)is a potentially fatal complication of *** use of postoperative prophylactic anticoagulation in patients who have undergone hepatectomy is controversial because of the risk of postoperative ***,we hypothesized that monitoring plasma D-dimer could be useful in the early diagnosis of VTE after *** To evaluate the utility of monitoring plasma D-dimer levels in the early diagnosis of VTE after *** The medical records of patients who underwent hepatectomy at our institution between January 2017 and December 2020 were retrospectively *** were divided into two groups according to whether or not they developed VTE after hepatectomy,as diagnosed by contrast-enhanced computed tomography and/or ultrasonography of the lower *** factors,including demographic data and perioperative D-dimer values,were compared between the two *** operating characteristic curve analysis was performed to determine the D-dimer cutoff *** and multivariate analyses were performed using logistic regression analysis to identify significant *** In total,234 patients who underwent hepatectomy were,of whom(5.6%)were diagnosed with VTE following hepatectomy.A comparison between the two groups showed significant differences in operative time(529 vs 403 min,P=0.0274)and blood loss(530 vs 138 mL,P=0.0067).The D-dimer levels on postoperative days(POD)1,3,5,7 were significantly higher in the VTE group than in the non-VTE *** the multivariate analysis,intraoperative blood loss of>275 mL[odds ratio(OR)=5.32,95%confidence interval(CI):1.05-27.0,P=0.044]and plasma D-dimer levels on POD 5≥21μg/mL(OR=10.1,95%CI:2.04-50.1,P=0.0046)were independent risk factors for VTE after *** Monitoring of plasma D-dimer levels after hepatectomy is useful for early diagnosis of VTE and may avoid routine prophylactic anticoagulation in the

关键词： Hepatectomy Malignant tumor Postoperative complication D-dimer Early diagnosis Venous thromboembolism

Morphology control of aluminum nitride(AlN)for a novel high-temperature hydrogen sensor

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1560-1567页

作者： Angga Hermawan Yusuke asakura Shu Yin Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku UniversitySendai 980-8577Japan

Hydrogen is a promising renewable energy source for fossil-free transportation and electrical energy ***,leaking hydrogen in high-temperature production processes can cause an explosion,which endangers production workers and surrounding *** detect leaks early,we used a sensor material based on a wide bandgap aluminum nitride(AlN)that can withstand a high-temperature *** unique AlN morphologies(rod-like,nest-like,and hexagonal plate-like)were synthesized by a direct nitridation method at 1400℃usingγ-AlOOH as a *** gas-sensing performance shows that a hexagonal plate-like morphology exhibited p-type sensing behavior and showed good repeatability as well as the highest response(S=58.7)toward a 750 ppm leak of H2 gas at high temperature(500°C)compared with the rod-like and nest-like ***,the hexagonal plate-like morphology showed fast response and recovery times of 40 and 82 s,*** surface facet of the hexagonal morphology of AlN might be energetically favorable for gas adsorption–desorption for enhanced hydrogen detection.

关键词： aluminum nitride controllable morphology direct nitridation γ-AlOOH hydrogen sensor

A facile method for preparation of uniformly decorated-spherical SnO2 by CuO nanoparticles for highly responsive toluene detection at high temperature

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Journal of Materials Science & Technology 2020年第16期47卷 119-129页

作者： Angga Hermawan Yusuke asakura Miki Inada Shu Yin Institute of Multidisciplinary Research for Advanced Materials(IMRAM) Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi980-857乙Japan Center of Advanced Instrumental Analysis Kyushu University6-1 Kasuga-Koen Kasuga-ShiFukuoka816-8580Japan

We reported a facile preparation of a uniform decoration of spherical n-type SnO2 by p-type CuO nanopa rticles as well as their utilization for enhanced performance on toluene gas *** nanoparticles and spherical SnO2 were synthesized by a facile non-hydrolytic solvothermal reaction,which could easily control their morphology.A uniform CuO nanoparticles decoration onto spherical SnO2 was achieved by a simple sonication and vigorous stirring at room tempe *** revealed orga nic solvents used in the oxide synthesis had a considerable influence on its surface charge that was beneficial for a uniformly electrostatic self-decoration between positively charged p-type CuO nanoparticles and negatively charged n-type spherical ***,CuO was partially reduced to Cu metal during high concentration of toluene exposure destroying p-n contact and developing new metal-semiconductor contact so-called ohmic junction,resulting in extraordinarily responsive and selective to toluene gas at 400℃as compared to a single p-CuO and *** was also found that the amount of particle decoration had an influence on sensor response and *** optimum amount of CuO nanoparticle decoration was0.1 mmol on 0.5 mmol *** re s ponse(S=Ra/Rg)and selectivity of CuO/S nO2 based material toward the exposure of 75 ppm toluene had reached to such high as 540 and 5,*** effect of p-n heterojunction and metal-semiconductor contact on the gas sensing mechanism of p-type CuO/n-type SnO2 was ***,by decorating with CuO nanoparticles,CuO/SnO2 morphology was well-maintained after gas sensing evaluation demonstrated its excellency for high temperature toluene gas sensor application.

关键词： CuO SnO2 p-n heterojunction Toluene gas sensor

Recent research progress on mixed valence state tungsten based materials

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Tungsten 2019年第1期1卷 5-18页

作者： Shu Yin Yusuke asakura Institute of Multidisciplinary Research for Advanced Materials Tohoku University2-1-1 KatahiraAoba-kuSendai 980-8577Japan

Synthesis and characterization of tungsten based mixed valence state nanoparticles and their novel applications are *** mixed valence state tungsten based homogeneous nanomaterials such as bronze structure M_(x)WO_(3)(M=Na^(+),K^(+),Rb^(+),Cs^(+),NH_(4)^(+),etc.)and tungsten sub-oxide W_(18)O_(49) possess excellent infrared(IR)light shielding property,implying their great potential applications on heat ray shielding and indoor energy saving effect in summer ***,some novel properties such as electric conductivity,bio thermal therapy function and electrochromic properties of mixed valence state tungsten based materials are *** design of components,formation of composites and structure control of thin films are expected to realize the property enhancement and candidates for practice application as window *** multifunc-tionality of the mixed valence state based composites also implies great potential on novel applications of various building materials.

关键词： Tungsten bronze Mixed valence state Smart window Infrared(IR)light shielding Thermochromic Photothermal ablation therapy(PTA) Multifunctionality

A simple and novel effective strategy using mechanical treatment to improve the oxygen uptake/release rate of YBaCo_(4)O_(7+δ) for thermochemical cycles

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Journal of Materials Science & Technology 2021年第9期68卷 8-15页

作者： Tingru Chen Yusuke asakura Takuya Hasegawa Teruki Motohashi Shu Yin Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku UniversitySendaiMiyagi980-8577Japan Department of Materials and Life Chemistry Kanagawa UniversityYokohama221-8686Japan

In recent years,oxygen storage materials(OSMs)have been widely used in many *** would be particularly important for researchers to design high-oxygen-uptake/release-rate *** this study,various synthesis processes were used to successfully synthesize YBaCo_(4)O_(7+δ)and comprehensively investigate their potential *** red with traditional solid-state reaction method and co-precipitation method,the results demonstrated that the utilization of mechanical ball milling treatment on co-precipitated precursors could lead to samples with reversible oxygen uptake/release under an oxidative atmosphere at low *** resultant materials exhibited fast oxygen absorption/desorption rate that could uptake/release oxygen directly to the equilibrium state within 9 min and20 min,*** mechanochemically ball-milled sample possessed outstanding oxygen sto rage performance,which could be attributed to their small particle size,the active outer surface of particles,large specific surface area,and relatively low activation ***,the ball-milled sample also exhibited excellent cycling stability during relatively short time *** results also demonstrated that the ball-milled samples could reversibly uptake/release 2.90 wt.%of excess oxygen(while only 0.70 wt.%for solid-state samples)by adjusting the ambient temperature under pure O_(2) atmosphere,which would make them promising candidates in various *** research demonstrated that mechanical treatment could be an effective strategy to tune the properties and oxygen storage capacity(OSC)performances of YBaCo_(4)O_(7+δ).

关键词： Oxygen storage materials Mechanical treatment YBaCo_(4)O_(7) Thermochemical cycles

Effect of Input Waveform to Vibration Speaker on Sound Quality of Electric Artificial Voice

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Sound & Vibration 2020年第2期54卷 85-98页

作者： T.asakura K.Shindo Tokyo University of Science Chiba278-8510Japan

A number of studies have been conducted on the improvement of the sound quality of electrical artificial laryngeal speech,the speech produced has been difficult to hear compared to a natural *** this reason,it is necessary to effectively improve the frequency characteristics of the input *** the present study,to improve the sound quality of vocalization using an electrical artificial larynx,first,a comparison of the frequency characteristics between the real and artificial voices was conducted,and three filters that can make the frequency characteristics of the artificial voice closer to those of a real voice were ***,the influence of these filters on the quality of the artificial voice was investigated via physical measurement and a subjective evaluation experiment targeted at Japanese five *** was found that the intelligibility of artificial/a/and/o/sounds was improved,whereas little improvement was observed in the case of/i/,/u/,and/e/.The obtained results confirmed the effect of optimizing the input signal into the vibration speaker and indicated areas for further improvement.

关键词： Electriolaryngeal voice intelligibility naturalness loudness

Improved thermochromic and photocatalytic activities of F-VO_(2)/ Nb-TiO_(2) multifunctional coating films

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Tungsten 2019年第4期1卷 306-317页

作者： Anung Riapanitra Yusuke asakura Shu Yin Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980‑8577Japan

Multifunctional photocatalytic and thermochromic composites consisting of fluorine-doped vanadium dioxide(F-VO_(2))and niobium-doped TiO_(2)(NTO)were prepared by a simple physical *** composites exhibited a higher thermochromic activity and nitrogen oxide(NO_(x))decomposition activity than that of pristine VO_(2)/*** VO_(2) and NTO materials were synthesized using an environmentally friendly soft chemical solvothermal/hydrothermal process,which produced NTO nanoparticles with a controllable morphology and particle size by changing the ratio of ethanol and acetic acid sol-vent.F-VO_(2)/NTO showed a better multifunctionality of thermochromic and photocatalytic activities than those of VO_(2)/NTO *** coexistence coating films showed a better effect on thermochromic and deNO_(x)(NO_(x) reduction)activity than those of double-sided films for F-VO_(2)/NTO *** best thermochromic and photocatalytic activities obtained from sample F-VO_(2)/NTO 60 showed the ΔT_(1500 nm)[difference of transmittance(ΔT)at the wavelength of 1500 nm under 25°C and 95°C]of up to 29.5%and deNO_(x) activity of up to 40%at λ>290 nm under mercury lamp *** use of F-VO_(2)/NTO coexistence coating films showed the appropriateness for multifunctional materials.

关键词： Nb-doped TiO_(2) VO_(2)(M) Thermochromic Photocatalytic NO_(x)decomposition Multifunctional coating