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Fabrication,nanostructures and electronic properties of nanodiamond-based solar cells

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Progress in Natural Science:Materials International 2010年第1期20卷 38-43页

作者： Akihiko NAGATA Takeo OKU kenji kikuchi Atsushi SUZUKI Yasuhiro YAMASAKI Eiji OSAWA Department of Materials Science The University of Shiga Prefecture Orient Chemical industries Co.Ltd. Department of New Business8-1 Sanra-Higashi-MachiNeyagawaOsaka572-8581Japan 3. NanoCarbon Research Institute Ltd.3-15-1 TokidaUedaNagano386-8567Japan

Nanodiamond-based solar cells were fabricated and the photovoltaic properties were ***(C60)and fullerenol(C60(OH)10-12)were used as n-type semiconductors,and diamond nanoparticles and metal phthalocyanine derivative were used as p-type *** nanostructures of the solar cells were investigated by transmission electron microscopy and X-ray diffracometry,and the electronic property was discussed.

关键词： solar cell nanodiamond C60 phthalocyanine

Formation and characterization of phthalocyanine dimer/C60 solar cells

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Progress in Natural Science:Materials International 2011年第1期21卷 27-30页

作者： Akihiro TAKEDA Akira MINOWA Takeo OKU Atsushi SUZUKI kenji kikuchi Yasuhiro YAMASAKI Department of Materials Science The University of Shiga Prefecture2500HassakaHikoneShiga 522-8533Japan Orient Chemical Industries Co.Ltd.Department of New Business8-1Sanra-Higashi-MachiNeyagawaOsaka 572-8581Japan

Organic solar cells withμ-oxo-bridged gallium phthalocyanine dimer(GaPc dimer) and fullerene were produced by an evaporation method.A device based on the GaPc dimer provided a conversion efficiency of 4.2×10-3%,which is better compared to a device based on phthalocyanine *** effect was discussed with a molecular orbital calculation,and the crystalline phases of the present solar cells were investigated by X-ray *** improvement of the efficiency was discussed on the basis of the experimental results.

关键词： phthalocyanine dimmer fullerene solar cell

Particle selectivity of filtering by C. elegans

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Theoretical & Applied Mechanics Letters 2019年第2期9卷 61-65页

作者： Yuki Suzuki kenji kikuchi Keiko Tsuruta-Numayama Takuji Ishikawa Graduate School of Engineering Tohoku University

A nematode Caenorhabditis elegans(C. elegans) is a filter feeder, which draws a suspension of bacteria and separates bacteria from the solvent by using pharyngeal pumping motions and specific mouth parts. This mechanism has not been fully understood. We investigated the mechanism of filtering of bacteria in the pharynx of C. elegans by visualization by fluorescent particles and dyed E. coli. We succeeded in quantifying the selectivity of bacteria-sized particles by C. elegans. The most accumulated particles were those of 0.5 μm in diameter. The quantity of accumulated particles of 0.2 μm or 1.0 μm in diameter was about one third of that of particles of 0.5μm in diameter. The least accumulated particles were those of 0.05 μm in diameter. These results suggest that the pharyngeal structures of C. elegans would be suitable for eating bacteria because the size of bacteria ingested by C. elegans worms is about 0.5 μm in diameter. We also succeeded in visualizing pharyngeal structures and pumping motions and flow in the pharynx. We found that there were phase differences in the motions among procorpus, metacorpus and isthmus. This result suggests filtering would occur at the two tips of procorpus and isthmus by the phase differences. We found that bacteria-sized particles and bacteria were flowed and trapped in the channels, which existed along the central lumen from tip of procorpus to isthmus. From our results, we proposed the novel mechanism of filtering of bacteria through the channels for flowing and trapping. In future, this selective filtering mechanism of C. elegans would be applied to development of microfluidic filtration devices for medical and biological equipment.

关键词： Nematode C.elegans Pharynx Pumping Filtering Selectivity

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Non-robotic minimally invasive gastrectomy as an independent risk factor for postoperative intra-abdominal infectious complications: A single-center, retrospective and propensity score-matched analysis

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World Journal of Gastroenterology 2020年第11期26卷 1172-1184页

作者： Susumu Shibasaki Koichi Suda Masaya Nakauchi Kenichi Nakamura kenji kikuchi Kazuki Inaba Ichiro Uyama Department of Surgery Fujita Health UniversityToyoake 470-1192AichiJapan Collaborative Laboratory for Research and Development in Advanced Surgical Technology Fujita Health University School of MedicineToyoake 470-1192AichiJapan

BACKGROUND Minimally invasive surgery for gastric cancer(GC) has gained widespread use as a safe curative procedure especially for early *** To determine risk factors for postoperative complications after minimally invasive gastrectomy for *** Between January 2009 and June 2019, 1716 consecutive patients were referred to our division for primary GC. Among them, 1401 patients who were diagnosed with both clinical and pathological Stage Ⅲ or lower GC and underwent robotic gastrectomy(RG) or laparoscopic gastrectomy(LG) were enrolled. Retrospective chart review and multivariate analysis were performed for identifying risk factors for postoperative *** Morbidity following minimally invasive gastrectomy was observed in 7.5% of the patients. Multivariate analyses demonstrated that non-robotic minimally invasive surgery, male gender, and an operative time of ≥ 360 min were significant independent risk factors for morbidity. Therefore, morbidity was compared between RG and LG. Accordingly, propensity-matched cohort analysis revealed that the RG group had significantly fewer intra-abdominal infectious complications than the LG group(2.5% vs 5.9%, respectively;P = 0.038), while no significant differences were noted for other local or systemic *** analyses of the propensity-matched cohort revealed that non-robotic minimally invasive surgery [odds ratio = 2.463(1.070–5.682);P = 0.034] was a significant independent risk factor for intra-abdominal infectious *** The findings showed that robotic surgery might improve short-term outcomes following minimally invasive radical gastrectomy by reducing intra-abdominal infectious complications.

关键词： Stomach neoplasms Gastrectomy Robotic surgical procedure Minimally invasive procedures Morbidity Pancreatic fistula

Prognostic factors of minimally invasive surgery for gastric cancer: Does robotic gastrectomy bring oncological benefit?

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World Journal of Gastroenterology 2021年第39期27卷 6659-6672页

作者： Masaya Nakauchi Koichi Suda Susumu Shibasaki Kenichi Nakamura Shinichi Kadoya kenji kikuchi Kazuki Inaba Ichiro Uyama Department of Gastroenterological Surgery Fujita Health UniversityToyoake 470-1192AichiJapan Department of Gastroenterological Surgery Ishikawa Prefectural Central HospitalKanazawa 920-8535IshikawaJapan

BACKGROUND Gastric cancer is the third leading cause of cancer-related death worldwide and surgical resection remains the sole curative treatment for gastric *** invasive gastrectomy including laparoscopic and robotic approaches has been increasingly used in a few *** far,only a few reports have investigated the oncological outcomes following minimally invasive *** To determine the 5-year survival following minimally invasive gastrectomy for gastric cancer and identify prognostic *** This retrospective cohort study identified 939 patients who underwent gastrectomy for gastric cancer during the study *** excluding 125 patients with non-curative surgery(n=77),other synchronous cancer(n=2),remnant gastric cancer(n=25),insufficient physical function(n=13),and open gastrectomy(n=8),a total of 814 consecutive patients with primary gastric cancer who underwent minimally invasive R0 gastrectomy at our institution between 2009 and 2014 were retrospectively ***,5-year overall and recurrence-free survival were analyzed using the Kaplan–Meier method with the log-rank test and Cox regression analyses,while factors associated with survival were determined using multivariate *** Our analysis showed that age>65 years,American Society of Anesthesiologists(ASA)physical status 3,total or proximal gastrectomy,and pathological T4 and N positive status were independent predictors of both 5-year overall and recurrencefree ***,the included patients had a 5-year overall and recurrence-free survival of 80.3%and 78.2%,*** the 814 patients,157(19.3%)underwent robotic gastrectomy,while 308(37.2%)were diagnosed with pathological stage II or III ***,our findings showed that robotic gastrectomy was an independent positive predictor for recurrence-free survival in patients with pathological stage II/III[hazard ratio:0.56(0.33-0.96),P=0.035].Comparison of recurrence-fre

关键词： Laparoscopy Gastric cancer Minimally invasive surgery Prognostic factor Stomach neoplasms

Microstructures and Photovoltaic Properties of Polysilane/C<sub>60</sub>-Based Solar Cells

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Materials Sciences and Applications 2012年第8期3卷 557-561页

作者： Atsushi Kawashima Takeo Oku Atsushi Suzuki kenji kikuchi Shiomi kikuchi Department of Materials Science The University of Shiga Prefecture Hikone Japan

Polysilane/C60-based solar cells were fabricated and investigated. Two-types of devices with bulk heterojunction and heterojunction structures were examined and characterized. Addition of silicon-based polymer to the organic solar cells improved the conversion efficiency by wide optical absorption and high carrier mobility. Microstructures of the solar cells were investigated by using X-ray diffraction and transmission electron microscopy. Energy levels in the present solar cells were discussed.

关键词： Bulk Heterojunction Polysilane Fullerene Microstructure

Formation of biomimetic hierarchical nanostructure in homopolymers and block copolymer ternary blend particles

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Particuology 2022年第5期20卷 98-109页

作者： Shu kikuchi Ryoka Shoji Shinji Kanehashi Guanghui Ma kenji Ogino Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology2-24-16 NakachoKoganei-shiTokyo 184-8588Japan Institute of Global Innovation Research Tokyo University of Agriculture and Technology2-24-16 NakachoKoganei-shiTokyo 184-8588Japan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100080China

In order to mimic hierarchical nanostructures in nature,particles of polymer blends consisting of poly(4-butyltriphenylamine)(PBTPA),poly(methyl methacrylate)(PMMA)and PBTPA-block-PMMA were fabricated by a solvent evaporation *** of the molecular weight and the chemical composition of PBTPA-b-PMMA,molecular weights of homopolymers,and the composition of the blend on the morphology were *** polymer blend particle consisting of PBTPA and PMMA homopolymers exhibited thermodynamically favored core-shell structure,in which more hydrophilic PMMA-shell surrounded *** addition of 10 wt%of PBTPA-b-PMMA caused the morphological transition from core-shell toJanus or inversed core-shell,in which PBTPA-shell surrounded PMMA-core,depending on the molecular weight of PBTPA segment in *** the molecular weight of PMMA segment was higher than that of PMMA homopolymer,watermelon-like particles in which small PBTPA domain less than 80 nm dispersed in the PMMA domain surrounded by PBTPA shell were *** the ratio of PBTPA-b-PMMA increased,the interface of the macrophase separation became *** 50 wt%of the PBTPA-b-PMMA,only microphase separation was *** measurement of interfacial tension by pendant drop method demonstrated that PBTPA-b-PMMA lower the interfacial tension between PBTPA and the aqueous phase to the value similar to that of PMMA with the aqueous phase.

关键词： Microsphere Hierarchical structure Polymer blend Block copolymer Solvent evaporation Phase separation

Diagnostic utility of endoscopic ultrasound-guided fineneedle aspiration biopsy for glomus tumor of the stomach

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World Journal of Gastroenterology 2015年第22期21卷 7052-7058页

作者： Shin Kato Kaoru kikuchi kenji Chinen Takahiro Murakami Fumihito Kunishima Department of Gastroenterology Okinawa Prefectural Chubu Hospital Department of Surgery Okinawa Prefectural Chubu Hospital Department of Pathology Okinawa prefectural Chubu Hospital

A 52-year-old man was referred for further investigation of a gastric submucosal tumor on the greater curvature of the antrum. Endoscopic ultrasonography demonstrated a hypoechoic solid mass, which was primarily connected to the muscular layer of the stomach. We performed endoscopic ultrasoundguided fine-needle aspiration biopsy. The pathological examination showed proliferation of oval-shaped cells with nest formation, which stained strongly positive for muscle actin, and negative for c-kit, CD34, CD56,desmin, S-100, chromogranin, and neuron-specific enolase. Therefore, we performed laparoscopy and endoscopy cooperative surgery based on the preoperative diagnosis of glomus tumor of the stomach. The final histological diagnosis confirmed the preoperative diagnosis. Although preoperative diagnosis of glomus tumor of the stomach is difficult with conventional images and endoscopic biopsy, endoscopic ultrasoundguided fine-needle aspiration biopsy is an essential tool to gain histological evidence of glomus tumor of the stomach for early diagnosis.

关键词： Glomus tumor Endoscopic ultrasoundguidedfine-needle aspiration biopsy Stomach Preoperative diagnosis

Mictomagnetism and suppressed thermal conduction of the prototype high-entropy alloy CrMnFeCoNi

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Journal of Materials Science & Technology 2022年第4期99卷 55-60页

作者： Jianyan Yang Weijun Ren Xinguo Zhao Tatsuya kikuchi Ping Miao kenji Nakajima Bing Li Zhidong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China J-PARC Center Japan Atomic Energy AgencyTokai 319-1112IbarakiJapan Institute of Materials Structure Science High Energy Accelerator Research Organization(KEK)Tokai 319-1106IbarakiJapan Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China China Spallation Neutron Source Science Center Dongguan 523803GuangdongChina

High-entropy alloys are characteristic of extensive atomic occupational disorder on high-symmetric lattices,differing from traditional ***,we investigate the magnetic and thermal transport properties of the prototype face-centered-cubic high-entropy alloy CrMnFeCoNi by combining physical properties measurements and neutron ***-current and alternating-current magnetizations measurements indicate a mictomagnetic behavior with coexisting antiferromagnetic and ferromagnetic interactions below room temperature and three anomalies are found at about 80,40,and 20 K,which are related to the paramagnetic to antiferromagnetic transition,the antiferromagnetic to ferromagnetic transition,and the spin freezing,*** electrical and thermal conductivities are significantly reduced compared to Ni,and the temperature dependence of lattice thermal conductivity exhibits a glasslike *** neutron scattering measurements suggest weak anharmonicity so that the thermal transport is expected to be dominated by the defect scattering.

关键词： High-entropy alloys Magnetism Inelastic neutron scattering Lattice dynamics Thermal conductivity

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