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Isolation and characterization of Cellulose Nanofiber from Subang Pineapple Leaf Fiber waste produced using Ultrafine Grinding method

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IOP Conference Series: materials science and Engineering 2021年第6期1098卷

作者： H Amirulhakim A L Juwono S Roseno Master Program of Materials Science Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Kampus UI Depok 16424 Indonesia Centre of Technology for Materials – BPPT PUSPIPTEK South Tangerang 15314 Indonesia

Pineapple leaf fiber (PALF) is one of natural fibres that has high cellulose content. However, pineapple plants must be replaced with new plants once it is harvested, leaving the leaves as waste. In this research, the isolation and characterization of Subang based PALF were conducted. Chemical pre-treatments including alkaline treatment with Sodium Hydroxide and bleaching to remove nanocellulosic constituents such as lignin and hemicellulose were conducted. This process was followed by mechanical treatment using ultrafine grinder to produce cellulose nanofiber (CNF). Transmission Electron Microscopy (TEM) images showed that the CNF had 45-75 nm in diameters. The percentage crystallinity was determined by X-ray diffraction (XRD). The crystallinity values of raw PALF, treated PALF, and CNF were 74.97%, 76,29%, and 69.52% respectively. Fourier Transform Infrared (FTIR) spectroscopy analysis was carried out to investigate the chemical structure changes after both chemical and mechanical treatments. The presence of a peak that related to cellulose confirmed that the process was well conducted. These results indicated that PALF waste could become added value to agricultural waste and expected to become reinforcement agent in nanocomposite for structural application since PALF had low aspect ratio and had high percentage crystallinity values.

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CCL5 Protects Cortical Neuron Function by Regulating M2 Microglia Activation After Mild Traumatic Brain Injury

SSRN

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SSRN 2022年

作者： Tsai, Yih-Jeng Ho, Man-Hau Yen, Chia-Hung Wang, Jia-Yi Burnouf, Thierry Chen, Chia-Yen Wang, Yun Chiang, Yung-Hsiao Hoffer, Barry J. Chou, Szu-Yi Department of Otolaryngology Head and Neck Surgery Shin Kong Wu HoSu Memorial Hospital Taipei Taiwan School of Medicine Fu Jen Catholic University New Taipei City Taiwan Ph.D. Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University National Health Research Institute Taiwan Graduate Institute of Neural Regenerative Medicine College of Medical Science and Technology Taipei Medical University Taipei Taiwan Department of Biological Science and Technology National Pingtung University of Science and Technology Neipu Pingtung91201 Taiwan Graduate Institute of Medical Sciences College of Medicine Taipei Medical University Taipei11031 Taiwan Department of Neurosurgery Taipei Medical University Hospital Taipei11031 Taiwan Neuroscience Research Center Taipei Medical University Taipei11031 Taiwan International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering College of Biomedical Engineering Taipei Medical University Taipei Taiwan NeuroTMULille International Laboratory Taipei Medical University Taipei Taiwan International PhD Program in Cell Therapy and Regeneration Medicine College of Medicine Taipei Medical University Taipei Taiwan Brain and Consciousness Research Centre TMU Shuang Ho Hospital New Taipei City Taiwan Center for Neuropsychiatric Research National Health Research Institutes Zhunan Miaoli County Taiwan Department of Surgery School of Medicine College of Medicine Taipei Medical University 11031 Taiwan Department of Neurosurgery Case Western Reserve University School of Medicine ClevelandOH United States Scientist Emeritus National Institutes of Health United States International Master Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University Taipei Taiwan

Cytokines and chemokines play important roles in inflammation and repair following brain injury. M1 microglia are pro-inflammatory which produce cytokines and lead to neural injury;in contrast, M2 microglia are anti-inflammatory, release neurotrophic factors, and promote neural repair processes. Chemokine CCL5, increased after TBI, shows a neuroprotective function by reducing oxidative stress. CCL5 may contribute to the balance between oxidative stress and immune responses after brain injury. Herein, we investigated the role of CCL5 in microglial polarization after mild traumatic brain injury, focusing on the cerebral cortex.C57BL/6 and CCL5 knockout (CCL5-KO) mice were given a mild traumatic brain injury (TBI) using weight-drop. Neurological parameters such as motor and sensory functions were analyzed by mNSS score, accelerating rotarod, beam walking, and adhesive removal tests. Oxidative stress and neuron damage were measured by NADPH oxidase activity, hypoxyloprobe staining and FJC. Performance of motor and sensory functions in both WT and CCL5-KO mice were impaired after brain injury which recovered after 7 days-post-injury (dpi) in the WT group but only after 14 days in the CCL5-KO mouse group. RT-qPCR analysis revealed that pro-inflammation cytokines - IL-1β, TNF-α, and IL-6 were higher in CCL5-KO mice compared to WT mice at 4 and 14 dpi. In contrast, M2-like microglia markers - IL-10 and Agr-1 were increased in WT mouse cortical tissue at 4 dpi. Oxidative stress increased both M1 and M2- related cytokine expression in BV2 cells treated with H 2 O 2;CCL5 treatment increased M2- but suppressed M1- related cytokine gene activation. Intranasal delivery of CCL5 reduced neuronal oxidative stress, increased IL-10 expression and improved motor and sensory functions in CCL5-KO mice after brain *** summary, CCL5, which alters immune responses and protects neurons from TBI damage, has an important function in regulating M2-like microglial polarization during post-

关键词： Polarization

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Fabrication and Electroluminescent Property of OLED with Boron-Complex

Fabrication and Electroluminescent Property of OLED with Bor...

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Electron Device and Mechanical Engineering (ICEDME), International Conference on

作者： Yu-Feng Lin Anchi Yeh Sheng-Lee Chen M-F Fanny Lin Department of Chemical and Materials Engineering ChungYuan Christiant University Taoyuan TW Department of Cosmetic and Fashion Styling Chengshiu University Kaohsiung TW Center of General Education Hsing Wu University of Science and Technology Taoyuan TW The Master program of Education Long Island University at CW Post New York USA

ISBN: (数字)9781728181455

ISBN: (纸本)9781728181462

A novel luminescence boron compound, [2-(4,5- diphenyl-1-imidazole-2-yl) pyridine] (DPIP-BPh2), has been synthesized by the reaction of pyridine-imidazole- based ligand. The decomposed temperature of DPIP-BPh2 is high than 200°C by thermogravimetric analyzer (TGA). For the three-layer organic light-emitting diodes (OLED) with the structure ITO/NPB/DPIP-BPh2/Alq3/Mg-Ag, an emission band centering at 490 nm with the maximum brightness of 1300 cd/m2 was observed, indicating a perfect blue OLED (CIE= 0.22, 0.36). DPIP-BPh2 forms a new family of organometallic emitting materials which which may bring benefits to people in practical applications.

关键词： Boron-Complex Imidazole Electroluminescence Electroluminescence Organic light emitting diodes Imidazoles Electrochemiluminescence fabrication New families Boron Compounds Blue OLED

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Composition and functional groups evaluation of Indonesian Grey Portland cement as material for dental application

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Key Engineering materials 2018年第1期782卷 256-261页

作者： Primathena, Indra Nurdin, Denny Farah Adang, Rahmi Alma Cahyanto, Arief Graduate School of Biomedical Science Master Program Faculty of Medicine Universitas Padjadjaran Jl. Prof. Eyckman No.38 Bandung40161 Indonesia Department of Dental Materials Science and Technology Faculty of Dentistry Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor45363 Indonesia

Tricalcium silicates cement known as Mineral Trioxide Aggregate (MTA) was one of the influential materials in endodontics. At recent, MTA in dental application play an essential role in endodontics treatment due to its potential to regenerate tertiary dentine, apexification, and seal perforated root. However, MTA for dental application is still expensive. Portland cement has similarities with the MTA, especially portland cement fabricated in Indonesia. The purpose of this study is to investigate the composition and functional groups of tricalcium silicate from portland cement that fabricated in Indonesia. The Indonesian grey portland cement powder/portland cement type I (SNI-15-7064-2014) was used as a sample and commercialized MTA from Tehnodent (Rootdent) was used as a control for comparison. Powder and control samples were evaluated using X-ray fluorescence spectrometry (XRF) for composition test and Fourier-transform infrared spectroscopy (FTIR) for functional group analyses. The XRF evaluation showed that the composition and concentration of Indonesian grey portland cement powder almost has similarity with commercial MTA. Moreover, the Indonesian grey portland cement powder has higher Calcium and Silicon ions compared to MTA. The FTIR analyses revealed that the calcium silicate groups were detected. In conclusion, the Indonesian grey portland cement powder has high similarity to MTA, therefore, it has a possibility to be used as tricalcium silicate cement for MTA substitution. Further study is awaited based on this initial finding found in this study. © 2018 Trans Tech Publications, Switzerland.

关键词： Portland cement

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Enhanced cycling stability of SiO,/Si/nickel foam thin film anodes for lithium ion batteries 233

Enhanced cycling stability of SiO,/Si/nickel foam thin film ...

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233rd Meeting of the Electrochemical Society

作者： Chili, K.-F. Leub, H.-J. Li, K.-C. Department of Materials Science and Engineering Feng Chia University 100 Wen Hwa Road Taichung407 Taiwan Master's Program of Green Energy Science and Technology Feng Chia University Taichung407 Taiwan

ISBN: (纸本)9781510866171

Silicon has been known as the next generation anode material for lithium-ion batteries (LIBs) due to its high theoretical specific capacity (4200 mA h g'1). However silicon anodes face the challenge of large volume change over 400 % during lithiation/delithiation cycles, leading to the pulverization of the silicon based electrodes. In this study, radio frequency (RF) magnetron sputtering is used to deposit amorphous silicon thin films on nickel foam current collectors. This flexible three-dimensional structure is found to relieve stress caused by the volume expansion. Furthermore, SiO, is coated on the previously fabricated silicon anodes as a buffer layer. The oxygen contents and the thickness of the SiO, are controlled by depositing under different Ar/02 ratios, and depositing times. The electrochemical behaviors of the SiO,/Si/nickel foam electrodes toward lithium are studied. It is found that the SiO,/Si/nickel foam electrodes with optimized oxygen contents and thickness of SiO, films exhibit high cycling stability and coulombic efficiency. The results are attributed to the stress relaxation effect provided by the flexible nickel foams and the SiO, buffer layers. © 2018 Electrochemical Society Inc. All Rights Reserved.

关键词： Silicon oxides

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Microstructure and electrochemical study of equal channel angular pressed Al-Zn alloys

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Journal of Physics: Conference Series 2019年第1期1380卷

作者： P Khamnantha S Linjee N S Palsson C Banjongprasert Master's Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand National Metal and Materials Technology Center National Science and Technology Development Agency Pathumthani 12120 Thailand

This research focuses on the effect of severe plastic deformation (SPD) on microstructure and properties of Al and Al-Zn (in 1, 2, 3, 4, 5 wt%) anodes of Al-air battery. The Al-Zn alloys with a diameter of 12.5 mm and 62.5 mm long were pressed in an ECAP die (press angle $=90°, XP=20°), using route Bc with 2, 4, 6, 8 passes at room temperature. Microstructural characterization was carried out using scanning electron microscope (SEM). The cast samples were solutionized at 450 °C for 1 hr after pressing. Grain size of the as-ECAP samples decreased with an increase of ECAP passes. The smaller grain size resulted in strengthening of Al-Zn. An decrease in grain size was due to significant change in the microstructure from an intensive shear stress after ECAP. Polarization test in a 3.5wt% NaCl solution were used to study electrochemical behaviours of the as-cast and ECAP Al-Zn alloys. The conclusion from the research will be used as a platform to develop Al anodes for Al-air battery in the future.

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Physical and chemical characterization of Lopburi clay before and after calcination

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Journal of Physics: Conference Series 2019年第1期1380卷

作者： P Chomyen S Sinthupinyo B Chamnankid W Hanpongpun A Chaipanich Advanced Cement-based Materials Laboratory Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Master Degree's Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Research and Innovation Center SCG Cement Co. Ltd. Kaeng Khoi Saraburi 18260 Thailand Center of Excellent in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand

Supplementary cementitous materials (SCMs) may be used as a substitution of Portland cement to reduce CO2 emissions in the cement industry. One of promising Supplementary cementituous materials for practical use in the construction industry is calcined clay. Clay must be calcined to form high reaxtivity pozzolanic materials from mineral addition known as amorphous metakaolin (AS2). Calcined clay may be used to improve mechanical properties, durability and some characteristic. This research aimed to study clay mineralogy and chemical composition of Lopburi clay in Thailand. Physical and chemical characterizations of Lopburi clay before and after calcination were investigated using X-Ray Diffraction, Qualitative X-Ray Diffraction (QXRD), Scanning Electron Microscopy (SEM) and X-Ray Fluorescene. The results showed that Lopburi clay main major oxides aed silicon dioxide (SiO2), alumina oxide (Al2O3) and iron oxide (Fe2O3) furthermore, Lopburi clay is kaolinite clay.

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Application of nanocatalyst iron oxide (Fe2O3) to reduce exhaust emissions (CO and HC) 1

Application of nanocatalyst iron oxide (Fe2O3) to reduce exh...

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1st materials Research Society-Indonesia Conference and Congress 2017, MRS-INA C and C 2017

作者： Puspitasari, P. Yazirin, C. Bachtiar, L.A. Dika, J.W. Zaharis, S.M.S.N.S. Mechanical Engineering Department Engineering Faculty Malang State University Semarang street 5 East-Java-Malang Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang street 5 East-Java-Malang Indonesia Master Program of Mechanical Engineering Engineering Faculty Malang State University Semarang street 5 East-Java-Malang Indonesia Bachelor Program Mechanical Engineering Department Malang State University Semarang street 5 East-Java-Malang Indonesia Industrial Chemical Technology Programme Faculty of Science and Technology Universiti Sains Islam Malaysia Bandar Baru Nilai Negeri Sembilan Nilai71800 Malaysia

Fe2O3 has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Fe2O3 is a chemical mixture that can be applied as a catalyst to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases The growth of motor vehicles results in air pollution and an increase in exhaust emissions consisting of 70.50% CO and 18.34% HC. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88, RON 90, RON 92, and RON 98. The results showed that the application of Fe2O3 as a catalyst could reduce the level of CO significantly in RON 88, i.e. 91.43% CO, and the level of HC in RON 88 and RON 92, i.e. 53.27% and 91.07% HC respectively. © Published under licence by IOP Publishing Ltd.

关键词： Catalytic converters

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Characterizations of carbon nanotubes grown on clay

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Journal of Physics: Conference Series 2019年第1期1380卷

作者： Aodkeng, S Sinthupinyo, S Chamnankid, B Hanpongpun, W Chaipanich, A Advanced Cement-based Materials Laboratory Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Master Degree’s Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Research and Innovation Center SCG Cement Co. Ltd. Kaeng Khoi Saraburi 18260 Thailand Advanced Cement-based Materials Laboratory Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Center of Excellent in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand

Carbon nanotubes (CNTs) are nano materials that have unique physical and mechanical properties. Carbon nanotubes grown on clay (Clay-CNTs) are new hybrid material based on clay mineral. Clay minerals were used as catalyst for CNTs synthesis by chemical vapor deposition at 700 °C for 1 hour. In this work, Clay-CNTs were investigated by various analytical techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM) and electron diffraction spectrometer (EDS) and Raman spectroscopy to analyse the phase identification of crystalline, morphology and crystallinity quality of Clay-CNTs. Moreover, thermogravimetric analysis (TG) was studied to ident ify phase deco mposition. XRD results indicate crystallites of the CNTs have (002), (101) and kaolinite and quartz from clay mineral catalyst. SEM images of Clay-CNTs showed cluster of CNTs on carbon fiber and their wormlike morphology. The intensity of Raman spectra of Clay-CNTs reveals the defect of CNTs structure. TGA derivative profile indicated decomposition of CNTs and kaolin.

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Synthesis and characterization of mullite-zirconia prepared through solid sintering of 3Al2O3-2SiO2 xerogel and ZrO2 xerogel as a dental implant material

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AIP Conference Proceedings 2020年第1期2219卷

作者： Yanwar Faza Arief Cahyanto Nina Djustiana I Made Joni 1Graduate School of Biomedical Science Master Program Faculty of Medicine Universitas Padjadjaran Jl. Prof Eyckman No. 38 Bandung Indonesia 2Department of Dental Materials Science and Technology Faculty of Dentistry Universitas Padjadjaran Jl. Raya-Bandung Sumedang KM 21 Jatinangor West Java 45363 Indonesia 3Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor West Java 45363 Indonesia 4Nanotechnology and Graphene Research Center Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor West Java 45363 Indonesia

Mullite-zirconia is a ceramic material that has mechanical properties values that are close with the jaw bone. Lately, various precursor characteristics were used to produce the mullite-zirconia as the starting material. However, the processing requires a higher temperature to achieve crystallization and densification of mullite-zirconia. In this study, mullite-zirconia was synthesized through solid sintering of 3Al2O3−2SiO2 xerogel and ZrO2 xerogel. Those xerogels were produced by the sol-gel method and characterized by particle size analyzer and scanning electron microscope. Subsequently, those xerogel were categorized into five batch composition (AlSi, Zr, 85AlSi/15Zr, 80AlSi/20Zr and 75AlSi/25Zr). These samples were then sintered at 1300 °C for 2 hours and characterized by X-ray diffraction. The result shows the acquired particle size of 3Al2O3−2SiO2 xerogel and ZrO2 xerogel are 355.7 nm and 414.3 nm respectively. The morphology of these samples are irregular, however, for ZrO2 xerogel, it has angular morphology in some particles. The XRD exposed AlSi turn into 100% mullite. Meanwhile, Zr produces 22% tetragonal zirconia and 78 % monoclinic zirconia. For 85AlSi/15Zr, it contains mullite and monoclinic zirconia with fraction amounts are 74.4 % and 25.6 % respectively. Subsequently, 80AlSi/20Zr shows the lower fraction amount of mullite crystallinity (71.5 %) along with increasing the amount of monoclinic zirconia (28.5%). Lastly, 75AlSi/25Zr shows the crystallinity of sillimanite, tridymite and monoclinic zirconia with the fraction amount are 57.3 %, 12.1%, 30.6 % respectively. We conclude the reduction in the number of zirconia is able to maintain the mullite crystal, however, along with the increase in zirconia, it inhibits the formation of the mullite structure due to Zr atom act as an inhibitor in substitution of Al with Si atom to form the mullite crystalline.

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