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Electrospinning of Nylon-6,6 Solutions into Nanofibers: Rheology and Morphology Relationships

Chinese Journal of Polymer Science 2014年第6期32卷 793-804页

作者： Ali Abbasi Mohamed Mahmoud Nasef matsuura takeshi Reza Faridi-Majidi Faculty of Chemical Engineering Universiti Teknologi Malaysia Institute of Hydrogen Economy International Campus Universiti Teknologi Malaysia Malaysia-Japan International Institute of Technology International Campus Universiti Teknologi Malaysia Department of Chemical & Biological Engineering University Ottawa Department of Medical Nanotechnology School of Advanced Medical Technologies Tehran University of Medical Sciences

The relationship between the rheological properties of nylon-6,6 solutions and the morphology of their electrospun nanofibers was established. The viscosity of nylon-6,6 in formic acid （90%） was measured in the concentration range of 5 wt%-25 wt% using a programmable viscometer. Electrospinning of nylon-6,6 solutions was carried out under controlled parameters. The chemical structure, morphology and thermal properties of the obtained nanofibers were investigated using Fourier transform infrared spectroscopy （FTIR）, scanning electron microscopy （SEM） and differential scanning calorimetry （DSC）, respectively, Entanglement concentration （ce） was found to be 15 wt% and a power law relationship between specific viscosity and solution concentration was observed with exponents of 2.0 and 3.3 for semi-dilute unentangled （c 〈 ce） and semi-dilute entangled （c 〉 ce） regimes, respectively. The diameter and uniformity of the nanofibers were found to be dependent on the viscosity. Moreover, the average diameter of electrospun nanofibers was found to be dependent on zero shear rate viscosity and normalized concentration （c/ce） in a power law relationship with exponents of 0.298 and 0.816, respectively. For nylon-6,6 solutions, the entanglement concentration （ce = 15 wt%） provides the threshold viscosity required for the formation of a stable polymeric jet during electrospinning and producing uniform beadless fibers. For concentrations less than ce, beaded fibers with some irregularities are formed. DSC analysis showed an increase in crystallinity of all electrospun samples compared to original polymer. Furthermore; Based on FTIR spectroscopy, α phase is dominant in electrospun nanofibers and minor amount offland ）,phases is also available.

关键词： Nylon-6,6 electrospinning Viscosity Nanofibers Entanglement concentration Crystallinity.

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Advances in high carbon dioxide separation performance of poly(ethylene oxide)-based membranes

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Journal of Energy Chemistry 2020年第7期29卷 30-52,I0002页

作者： Samaneh Bandehali Abdolreza Moghadassi Fahime Parvizian Sayed Mohsen Hosseini takeshi matsuura Ezatollah Joudaki Department of Chemical Engineering Faculty of EngineeringArak UniversityArak 38156-8-8349Iran Department of Chemical and Biological Engineering University of OttawaOttawaOntario K1N 6N5Canada

Poly(ethylene-oxide)(PEO)-based membranes have attracted much attention recently for CO2 separation because CO2 is highly soluble into PEO and shows high selectivity over other gases such as CH4 and ***,those membranes are not strong enough mechanically and highly crystalline,which hinders their broader applications for separation *** this review discussions are made,as much in detail as possible,on the strategies to improve gas separation performance of PEO-based *** of techniques such as synthesis of graft copolymers that contain PEO,cross-linking of polymers and blending with long chains polymers contributed significantly to improvement of *** of ionic liquids/nanoparticles has also been found ***,surface modification of nanoparticles has been done chemically or physically to enhance their compatibility with polymer *** a result of all such efforts,an excellent performance,i.e.,CO2 permeability up to 200 Barrer,CO2/N2 selectivity up to 200 and CO2/CH4 selectivity up to 70,could be *** method is to introduce functional groups into PEO-based polymers which boosted CO2 permeability up to 200 Barrer with CO2/CH4 selectivity between 40 and *** CO2 permeability of PEO-based membranes increases,without much change in selectivity,when the length of ethylene oxide is increased.

关键词： Membrane gas separation Molecular design Poly(ethylene oxide) CO2/CH4 separation

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Fabrication and characterization of affordable hydrophobic ceramic hollow fibre membrane for contacting processes

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Journal of Advanced Ceramics 2017年第4期6卷 330-340页

作者： Mohammed Abdulmunem ABDULHAMEED Mohd Hafiz Dzarfan OTHMAN Haider Nadhom Azziz Al JODA Ahmad Fauzi ISMAIL takeshi matsuura Zawati HARUN Mukhlis A.RAHMAN Mohd Hafiz PUTEH Juhana JAAFAR Advanced Membrane Technology Research Centre(AMTEC) Faculty of Chemical and Energy EngineeringUniversiti Teknologi Malaysia81310 UTM Johor BahruJohorMalaysia Department of Petroleum and Petrochemical Engineering Engineering CollegeKerbala University56001 KerbalaIraq Department of Chemical and Biological Engineering University of OttawaOttawaOntarioK1N 6N5Canada Advanced Manufacturing&Materials Centre(AMMC) Faculty of Mechanical and Manufacturing EngineeringUniversiti Tun Hussein Onn MalaysiaParit Raja86400 Batu PahatJohorMalaysia Department of Environmental Engineering Faculty of Civil EngineeringUniversiti Teknologi Malaysia81310 UTM Johor BahruJohorMalaysia

Affordable hydrophobic hollow fibre membranes were prepared using kaolin and alumina based ceramic powders via a combined phase inversion and sintering technique,followed by a grafting with fluoroalkylsilane(FAS).The crux of the matter in this paper is to study the changes in the properties of the hollow fibre membranes(gas permeation,mechanical strength,pore size,porosity,tortuosity,morphology,and contact angle)by the addition of alumina(Al2O3)to the pure kaolin with mono or multiparticle *** varying the overall loading and particle size of alumina addition,different morphologies of the membranes were obtained due to the differences in the path lengths during phase inversion process for each solvent and nonsolvent *** successful grafting with FAS was evidenced by the increase in contact angle from nearly equal to zero degree before grafting to 140°after ***-alumina-4,one of the hollow fibres fabricated in this work,achieved a mean pore size of 0.25μm with the bending strength of 96.4 MPa and high nitrogen permeance of 2.3×10^(-5) mol·m^(-2)·Pa^(-1)·s^(-1),which makes the hollow fibre most suitable for the membrane contactor application.

关键词： ceramic membrane contactor hollow fibre kaolin hydrophobic

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Numerical Simulation of Ice Accretion Phenomena on Rotor Blade of Axial Blower

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Journal of Thermal Science 2012年第4期21卷 322-326页

作者： Taiki matsuura Masaya Suzuki Makoto Yamamoto Shinichiro Shishido takeshi Murooka Hiroshi Miyagawa Graduate School of Mechanical Engineering Tokyo University of Science 1-14-6 Kudankita Chiyoda-ku Department of Mechanical Engineering Tokyo University of Science 1-14-6 Kudankita Chiyoda-ku Research and Engineering Division IHI Corporation 229 Tonogaya Mizuho-cho Nishitama-gun

Ice accretion is the phenomenon that super-cooled water droplets impinge and accrete on a body. It is well known that ice accretion on blades and airfoils leads to performance degradation and severe accidents. For this reason, experimental investigations have been carried out using flight tests or icing tunnels. However, it is too expensive, dangerous, and difficult to set actual icing conditions. Hence, computational fluid dynamics is useful to predict ice accretion. A rotor blade is one of jet engine components where ice accretes. Therefore, the authors focus on the ice accretion on a rotor blade in this study. Three-dimensional icing phenomena on the rotor blade of a commercial axial blower are computed here, and ice accretion on the rotor blade is numerically investigated.

关键词：转子叶片轴流风机积冰数值模拟计算流体动力学喷气发动机严重事故性能退化

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The Friction Welding Method with Intermediate Material

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Journal of Mechanics Engineering and Automation 2013年第11期3卷 677-684页

作者： Ryoji Tsujino takeshi Higashi Kiyoshi matsuura Yoshiaki Ueda Manabu Iguchi Faculty of Science and Engineering Setsunan University Neyagawa 672-8508 Japan Faculty of Engineering Setsunan University Neyagawa 672-8508 Japan Taiyu Corp. Neyagawa 572-0077 Japan Division of Materials Science and Engineering Graduate School of Engineering Hokkaido University Hokkaido 060-8628 Japan Faculty of Engineering Osaka Electro-Communication University Neyagawa 572-8530 Japan

For the purpose of improving the defects of the conventional friction welding method, the new friction welding technology has been examined. That is, the aim of the study is producing the joint of dissimilar materials evaluated to be difficult for friction welding and non-round shape joints. In this process, after the intermediate material generates the independent friction heat on every side of the specimens, it is removed instantaneously and upset process begins to weld the specimens for a joint. In this study, similar joint of A2017 aluminum alloy and one of S45C steel were examined. On the other hand, thermal elastic-plastic stress analysis by the finite element method was carried out using ANSYS mechanical.

关键词：摩擦焊接焊接方法中间材料焊接试样 ANSYS 焊接技术异种材料应力分析

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Behavior of Motile Sperm in Taylor-Couette Flow: Effect of Shear Stress on the Behavior of Motile Sperm

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Open Journal of Fluid Dynamics 2013年第2期3卷 9-13页

作者： Yasutaka Hayamizu Toru Hyakutake Koji matsuura Shinichiro Yanase Shinichi Morita Shigeru Ohtsuka takeshi Gonda Department of Mechanical Engineering Yonago National College of Technology Tottori Japan Graduate School of Engineering Yokohama National University Yokohama Japan Graduate School of Natural Science and Technology Okayama University Okayama Japan Research Core for Interdisciplinary Sciences Okayama University Okayama Japan

Infertility is often cited as one of the causes of a declining birthrate, which has become a serious social problem in recent years. Processes by which motile sperm can be safely and easily sorted are therefore important for infertility treatment. Therefore, as a new sorting method, microfluidic sperm sorter using the microfluidic system has been developed. To improve more separation efficiency of this device, it is necessary to know the behaviors of motile sperm in the microchannel where the sperm undergo shear flow. The previous study implied the necessity of the modeling of motile sperm in the shear flow. In the present study, therefore, we experimentally investigated the behavior of the motile sperm in the Taylor-Couette flow using PTV (Particle Tracking Velocimetry) method. The experimental results showed that the ascent of the shear stress led to the increase in the sperm velocity, and the direction of the sperm velocity was opposite to that of the flow.

关键词： Motile Sperm Taylor-Couette Flow Shear Stress PTV

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Pink-color sign in esophageal squamous neoplasia, and speculation regarding the underlying mechanism

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World Journal of Gastroenterology 2013年第27期19卷 4300-4308页

作者： Ryu Ishihara Hiromitsu Kanzaki Hiroyasu Iishi Kengo Nagai Fumi Matsui takeshi Yamashina Noriko matsuura Takashi Ito Mototsugu Fujii Sachiko Yamamoto Noboru Hanaoka Yoji Takeuchi Koji Higashino Noriya Uedo Masaharu Tatsuta Yasuhiko Tomita Shingo Ishiguro Department of Gastrointestinal Oncology Osaka Medical Center for Cancer and Cardiovascular Diseases Department of Gastroenterology and Hepatology Okayama University Graduate School of Medicine Department of Pathology Osaka Medical Center for Cancer and Cardiovascular Diseases PCL Osaka Inc.

AIM:To investigate the reasons for the occurrence of the pink-color sign of iodine-unstained lesions. METHODS:In chromoendoscopy, the pink-color sign of iodine-unstained lesions is recognized as useful for the diagnosis of esophageal squamous cell carcinoma. Patients with superficial esophageal neoplasms treated by endoscopic resection were included in the study. Areas of mucosa with and without the pink-color sign were evaluated histologically. The following histologic features that were possibly associated with the pinkcolor sign were evaluated. The keratinous layer and basal cell layer were classified as present or absent. Cellular atypia was classified as high grade, moderate grade or low grade, based on nuclear irregularity, mitotic figures, loss of polarity, chromatin pattern and nuclear/cytoplasmic ratio. Vascular change was assessed based on dilatation, tortuosity, caliber change and variability in shape. Vessels with these four findings were classified as positive for vascular change. Endoscopic images of the lesions were captured immediately after iodine staining, 2-3 min after iodine staining and after complete fading of iodine staining. Quantitative analysis of color changes after iodine staining was also performed. RESULTS:A total of 61 superficial esophageal neoplasms in 54 patients were included in the study. The lesions were located in the cervical esophagus in one case, the upper thoracic esophagus in 10 cases, the mid-thoracic esophagus in 33 cases, and the lower thoracic esophagus in 17 cases. The median diameter of the lesions was 20 mm (range:2-74 mm). Of the 61 lesions, 28 were classified as pink-color sign positive and 33 as pink-color sign negative. The histologic diagnosis was high-grade intraepithelial neoplasia (HGIN) or cancer invading into the lamina propria in 26 of the 28 pink-color sign positive lesions. There was a significant association between pink-color sign positive epithelium and HGIN or invasive cancer (P = 0.0001). Univariate

关键词： Chromoendoscopy Esophageal cancer Esophageal squamous neoplasia Iodine staining Pinkcolor sign

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Numerical Simulation of New Friction Welded Joints

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Journal of Mechanics Engineering and Automation 2013年第10期3卷 595-601页

作者： takeshi Higashi Ryoji Tsujino Kiyoshi matsuura Yoshiaki Ueda Manabu Iguchi Faculty of Engineering Setsunan University Neyagawa 672-8508 Japan Faculty of Science and Engineering Setsunan University Neyagawa 672-8508 Japan Taiyu Corp. Neyagawa 572-0077 Japan Division of Materials Science and Engineering Graduate School of Engineering Hokkaido University Hokkaido 060-8628 Japan Faculty of Engineering Osaka Electro-Communication University Neyagawa 572-8530 Japan

In developing the new friction welding technology, the thermal elastic-plastic stress analysis by the finite element method was carried out to seek the suitable welding conditions such as the friction pressure, the friction speed and the upset pressure. The results obtained are as follows: Heat transfer to the specimens and the intermediate material during friction process was made clear; The operational conditions such as the rotation number of the intermediate material and the friction pressure to reach the liquidus in the interface could be estimated; Further, as the overhang length near the interface is well related to the joint efficiency, we tried to obtain the operational conditions by numerical analysis to acquire a certain length of the overhang length near the interface.

关键词：摩擦焊接头数值模拟热弹塑性应力摩擦压力中间材料操作条件伸长度焊接技术

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Feasibility of cold snare polypectomy in Japan: A pilot study

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World Journal of Gastrointestinal Endoscopy 2015年第17期7卷 1250-1256页

作者： Yoji Takeuchi takeshi Yamashina Noriko matsuura Takashi Ito Mototsugu Fujii Kengo Nagai Fumi Matsui Tomofumi Akasaka Noboru Hanaoka Koji Higashino Hiroyasu Iishi Ryu Ishihara Henrik Thorlacius Noriya Uedo Department of Gastrointestinal Oncology Osaka Medical Center for Cancer and Cardiovascular Diseases Department of Clinical Sciences Section of SurgeryMalmoLund University

AIM: To investigate the feasibility of cold snare polypectomy(CSP) in ***: The outcomes of 234 non-pedunculated polyps smaller than 10 mm in 61 patients who underwent CSP in a Japanese referral center were retrospectively analyzed. The cold snare polypectomies were performed by nine endoscopists with no prior experience in CSP using an electrosurgical snare without ***: CSPs were completed for 232 of the 234 polyps. Two(0.9%) polyps could not be removed without electrocautery. Immediate postpolypectomy bleeding requiring endoscopic hemostasis occurred in eight lesions(3.4%; 95%CI: 1.1%-5.8%), but all were easily managed. The incidence of immediate bleeding after CSP for small polyps(6-9 mm) was significantly higher than that of diminutive polyps(≤ 5 mm; 15% vs 1%, respectively). Three(5%) patients complained of minor bleeding after the procedure but required no intervention. The incidence of delayed bleeding requiringendoscopic intervention was 0.0%(95%CI: 0.0%-1.7%). In total, 12% of the resected lesions could not be retrieved for pathological examination. Tumor involvement in the lateral margin could not be histologically assessed in 70(40%) ***: CSP is feasible in Japan. However, immediate bleeding, retrieval failure and uncertain assessment of the lateral tumor margin should not be underestimated. Careful endoscopic diagnosis before and evaluation of the tumor residue after CSP are recommended when implementing CSP in Japan.

关键词： Colonoscopy Endoscopic gastrointestinal surgery Colorectal neoplasm Polypectomy Cold snare polypectomy

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