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Synthesis and Characterization of a Dithiodiglycolic Acid-Incorporated Poly(Glycerol Sebacate) Exhibiting Lipase Resistance and Antibacterial Properties

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SSRN 2024年

作者： Jiang, Yi-Sheng Hu, Ming-Hsien Hu, Jin-Jia Jan, Jeng-Shiung Department of Chemical Engineering National Cheng Kung University Tainan70101 Taiwan Bachelor Program for Design and Materials for Medical Equipment and Devices Da-Yeh University Changhua515 Taiwan Orthopedic Department Showchwan Memorial Hospital Changhua500 Taiwan Department of Mechanical Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan

Poly(glycerol sebacate) (PGS), a crosslinked network synthesized by polycondensation of glycerol and sebacic acid, has found successful utilization in various tissue engineering applications because of its biocompatibility, ease of synthesis, surface-erosion biodegradability, rubber-like elasticity, and adjustable mechanical properties. However, its fast in vivo degradation and lack of intrinsic antibacterial activity may be a concern for specific applications. The functional groups of glycerol and sebacic acid can react with those of other monomers, offering unlimited possibilities for generating new crosslinked networks tailored for particular purposes. Herein, we synthesized a series of poly(glycerol sebacate dithiodiglycolate) (PGSDTG) by incorporation dithiodiglycolic acid in the synthesis of PGS. The incorporation of dithiodiglycolic acid into PGS analogs reduced stiffness, resisted to lipase, and sensitized to glutathione (GSH). The degradation mechanism of PGSDTG was similar to that of PGS. Also, PGSDTG significantly inhibited the adhesion and growth of S. aureus and E. coli. This study suggested that PGSDTG may serve as a suitable antibacterial scaffold material for repairing or regenerating tissues characterized by a slow healing rate. © 2024, The Authors. All rights reserved.

关键词： Glycerol

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Synthesis and characterization of a dithiodiglycolic acid-incorporated poly(glycerol sebacate) exhibiting lipase resistance and antibacterial properties

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European Polymer Journal 2024年 214卷

作者： Jiang, Yi-Sheng Hu, Ming-Hsien Hu, Jin-Jia Jan, Jeng-Shiung Department of Chemical Engineering National Cheng Kung University Tainan70101 Taiwan Bachelor Program for Design and Materials for Medical Equipment and Devices Da-Yeh University Changhua515 Taiwan Orthopedic Department Showchwan Memorial Hospital Changhua 500 Taiwan Department of Mechanical Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan

Poly(glycerol sebacate) (PGS), a crosslinked network synthesized by polycondensation of glycerol and sebacic acid, has found successful utilization in various tissue engineering applications because of its biocompatibility, ease of synthesis, surface-erosion biodegradability, rubber-like elasticity, and adjustable mechanical properties. However, its fast in vivo degradation and lack of intrinsic antibacterial activity may be a concern for specific applications. The functional groups of glycerol and sebacic acid can react with those of other monomers, offering unlimited possibilities for generating new crosslinked networks tailored for particular purposes. Herein, we synthesized a series of poly(glycerol sebacate dithiodiglycolate) (PGSDTG) by incorporation of dithiodiglycolic acid (DTG) in the synthesis of PGS. PGSDTG exhibited reduced stiffness, sensitivity to glutathione (GSH), resistance to lipase degradation, and inhibition of bacterial adhesion and growth. The PGSDTG containing 45.6 wt% of DTG exhibited the lowest degradation rate with more than 80 wt% of PGSDTG remained at day 28 and the lowest bacterial inactivation rates of 99.2 ± 0.5 % and 82.5 ± 11.0 % against S. aureus and E. coli, respectively. This study suggested that PGSDTG may serve as a suitable antibacterial scaffold material for repairing or regenerating tissues characterized by a slow healing rate. © 2024 Elsevier Ltd

关键词： Glycerol

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Thickness, Annealing, and Surface Roughness Effect on Magnetic and Significant Properties of Co40Fe40B10Dy10 Thin Films

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Materials 2023年第17期16卷

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Wang, Yu-Zhi Wu, Chueh-Lin Lin, Shih-Hung Ou, Sin-Liang Department of Materials Science and Engineering I-Shou University Kaohsiung84001 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Douliou64002 Taiwan Bachelor Program for Design and Materials for Medical Equipment and Devices Da-Yeh University Changhua51591 Taiwan

In this study, Co40Fe40B10Dy10 thin films were deposited using a direct current (DC) magnetron sputtering technique. The films were deposited on glass substrates with thicknesses of 10, 20, 30, 40, and 50 nm, and heat-treated in a vacuum annealing furnace at 100, 200, and 300 °C. Various instruments were used to examine and analyze the effects of roughness on the magnetic, adhesive, and mechanical properties. From the low frequency alternating current magnetic susceptibility (χac) results, the optimum resonance frequency is 50 Hz, and the maximum χac value tends to increase with the increase in the thicknesses and annealing temperatures. The maximum χac value is 0.18 at a film thickness of 50 nm and an annealing temperature of 300 °C. From the four-point probe, it is found that the resistivity and sheet resistance values decrease with the increase in film deposition thicknesses and higher annealing temperatures. From the magnetic force microscopy (MFM), the stripe-like magnetic domain distribution is more obvious with the increase in annealing temperature. According to the contact angle data, at the same annealing temperature, the contact angle decreases as the thickness increases due to changes in surface morphology. The maximal surface energy value at 300 °C is 34.71 mJ/mm2. The transmittance decreases with increasing film thickness, while the absorption intensity is inversely proportional to the transmittance, implying that the thickness effect suppresses the photon signal. Smoother roughness has less domain pinning, more carrier conductivity, and less light scattering, resulting in superior magnetic, electrical, adhesive, and optical performance. © 2023 by the authors.

关键词： Thin films

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Entropy Generation and Exergy Assessment of Methane-Nitrous Oxide Diffusion Flames in a Triple-Port Burner

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International Journal of Energy Research 2023年第1期2023卷

作者： Chou, Dean Tsai, Wen-Yuan Emami, Mohsen Davazdah Li, Yueh-Heng Department of Biomedical Engineering National Cheng Kung University Tainan701 Taiwan Medical Device Innovation Centre National Cheng Kung University Tainan City701 Taiwan Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Department of Mechanical Engineering Isfahan University of Technology Isfahan84156-83111 Iran International Bachelor Degree Program on Energy Engineering National Cheng Kung University Tainan701 Taiwan

A triple-port burner was used in this study, and a numerical simulation was employed to investigate the entropy generation rate of CH4-N2O diffusion flames at the Rratio=1. Here, R ratio refers to the ratio of the oxidizer flow velocity to the fuel flow velocity. In order to scrutinize the decomposition effect of N2O on entropy generation, an oxygen-enriched gas with the same nitrogen to oxygen ratio as N2O (N-to-O=2) was used in CH4-N2-O2 diffusion flames. Besides, because the N2O could decompose into the oxygen-enriched gas, the oxygen-enriched effect was also studied by the CH4-air diffusion flames that were conducted in this research. The entropy generation rate comprises of three items in this study, including heat conduction, mass diffusion, and chemical reaction. As a result, the different reaction pathways would take part in the major reaction pathway in CH4-N2O diffusion flames, causing more entropy generation rate being produced through the more intense reactions in CH4-N2O diffusion flames. The irreversibility in CH4-air diffusion flames are dominated through heat conduction and chemical reaction, which is an identical result in CH4-N2-O2 diffusion flames. However, in CH4-N2O diffusion flames, chemical reactions dominated the irreversibility because of the more intense reaction caused by the thermal effect of N2O decomposition. As a result, the decomposition effect of N2O influences the availability of CH4-N2O diffusion flames. © 2023 Dean Chou et al.

关键词： Heat conduction

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Experimental investigation of convective heat transfer on car radiator using Al2O3-water nanofluids

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AIP Conference Proceedings 2023年第1期2680卷

作者： Wayan Nata Septiadi Komang Manik Marianti Anak Agung Gde Agung Krisnanta Dwipayana Dandi Ramadhani Abel Yosua Tommy Department of Mechanical Engineering Udayana University Badung Bali 80361 Indonesia Bachelor Program of Mechanical Engineering Udayana University Badung Bali 80361 Indonesia

Technological development refers to improving performance and checking dimensions, especially in car cooling systems. The impact of these developments causes an increase in the heat flux produced so that conventional cooling fluids cannot handle it and are starting to be abandoned. One of the most popular cooling systems in cars is the radiator. The use of nanoparticles has also begun to be widely used as an alternative working fluid, both as a working fluid for radiator cooling systems and as a working fluid and other cooling technologies. This test was performed on a simulated radiator cooling system on a standard car and varied the mass flow rate at 4 lpm; 3 lpm; 2 lpm and volume fraction 0. 1% on the composition of nanofluid Al2O3−Water and water-base fluid and the process of testing the heat transfer rate is carried out by heating the working fluid in the heating tank to 80°C then running it on the car radiator cooling system for 10 minutes and the visual results of the temperature drop will be read in the Labview program. The test results show that the higher the mass flow rate, the greater the heat transfer rate of the working fluid, In this test, the Al2O3−Water nanofluid showed a better heat transfer rate than.

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Fiber Bragg Grating-Based Accelerometer Design Based on Multi-Objective Optimization

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SSRN 2024年

作者： Macedo, Leandro Louzada, Pablo Villani, Luis Gustavo Frizera-Neto, Anselmo Marques, Carlos Leal-Junior, Arnaldo G. Postgraduate Program in Electrical Engineering The Federal University of Espírito Santo Av. Fernando Ferrari 514 - Goiabeiras Espírito Santo Vitória29075-910 Brazil Bachelor Program in Mechanical Engineering The Federal University of Espírito Santo Av. Fernando Ferrari 514 - Goiabeiras Espírito Santo Vitória29075-910 Brazil Physics Department and i3N University of Aveiro Santiago Campus Aveiro3810-193 Portugal CICECO - Aveiro Institute of Materials University of Aveiro Santiago Campus Aveiro3810-193 Portugal

In this work, a Fiber Bragg grating-based accelerometer design is presented. Different geometries (Double-L Cantilever, Single Cantilever, Triangular Cantilever, Clamped-Clamped Cantilever, Capillary Steel Tube, and Flexible Hinges) are analyzed using analytical models to select the one that meets the project requirements: natural frequency of at least 500 Hz and acceleration sensitivity of at least 100 pm/g. After this step, a multi-objective optimization approach is used to provide a geometric parameter combination to generate a Pareto front to analyze different sets of natural frequencies and acceleration sensitivities. Through this procedure, four combinations of geometric parameters were selected to provide one accelerometer with the maximum natural frequency, one accelerometer with the maximum acceleration sensitivity, and two accelerometers that fulfilled the project requirements. These structures were numerically evaluated using modal finite element analysis. Finally, the experimental characterization of the manufactured sensors was carried out at three different excitation frequencies: 17 Hz, 35 Hz, and 50 Hz. For 17 Hz, the experimental sensitivities were 180 pm/g, 690 pm/g, 380 pm/g, and 400 pm/g, for accelerometers 1, 2, 3, and 4, respectively. For 35 Hz, the experimental sensitivities were 150 pm/g, 510 pm/g, 290 pm/g, and 230 pm/g, for accelerometers 1, 2, 3, and 4, respectively. For 50 Hz, the experimental sensitivities were 120 pm/g, 410 pm/g, 150 pm/g, and 160 pm/g, for accelerometers 1, 2, 3, and 4, respectively. The multi-objective optimization procedure proposed in this work is a versatile tool for accelerometer design, where different geometric parameter combinations can be studied to meet different project requirements. In the case of quasi-distributed mechanical vibration monitoring, where project requirements vary depending on the sensor’s location, this is an advantageous alternative. © 2024, The Authors. All rights reserved.

关键词： Multiobjective optimization

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The effect of copper-based catalytic converter with circular tube shape on exhaust emission of Yamaha Vixion 1PA 2

The effect of copper-based catalytic converter with circular...

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2nd International Conference on Green Civil and Environmental engineering, GCEE 2019

作者： Shoffan, I.A.N. Sumarli, S. Nauri, I.M. Department of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang Indonesia Bachelor Program Department of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang Indonesia

Indonesia is one of the countries with the third highest air pollution in the world. The biggest contributor air pollution is produced by motorbikes by 60-70%. One the causes of increased exhaust emission is widespread use absorptive exhaust that designed without catalytic converter. The aims of this research is to determine the effect of copper-based catalytic converter with circular tube shape on exhaust emission of Yamaha Vixion 1PA. This study used an experimental research design. The objective of this research is copper catalyst with circular tube shape model. The research instrument used the gas analyzer HG-510 as a test tool for data collection of exhaust emission. Data analysis using inferential statistical techniques paired sample T test through the SPSS 24 statistical analysis application. The results showed that the addition of copper catalytic converter with a circular tube shape model can reduce CO exhaust emission by 16.67%, whereas for exhaust emission HC can be reduced by 32.54%. © Published under licence by IOP Publishing Ltd.

关键词： Catalytic converters

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Investigation of Sm Addition on Microstructural and Optical Properties of CoFe Thin Films

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Materials 2023年第15期16卷 5380页

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Lai, Jian-Xin Chen, Yuan-Tsung Chen, Hsiung-Liang Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou640301 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung City80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou640301 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou640301 Taiwan

CoFe-based alloys and rare earth (RE) elements are among the most studied materials in applying magnetic devices to improve soft magnetic characteristics. A series of Co40Fe40Sm20 films are deposited on a glass substrate via the sputtering technique, followed by an annealing process to investigate their effect on microstructural and optical properties of Co40Fe40Sm20 films. In this study, the increase in the thickness of Co40Fe40Sm20 films and annealing temperatures resulted in a smoother surface morphology. The 40 nm Co40Fe40Sm20 films annealed 300 °C are expected to have good wear resistance and adhesive properties due to their high values of H/E ratio and surface energy. Optical transparency also increased due to the smoother surface of the Co40Fe40Sm20 films. © 2023 by the authors.

关键词： Iron alloys

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High-temperature strain-mediated oxidation of 2D MoS2

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Materials and Design 2023年 236卷

作者： Rouhan, Mehdi Hobley, Jonathan Lin, Kuang-I Hofmann, Mario Yao, Yu-Chi Chang, Yung-Huang Carpick, Robert William Schall, J. David Jeng, Yeau-Ren Department of Biomedical Engineering National Cheng Kung University 1 University Road Tainan City70101 Taiwan Core Facility Center National Cheng Kung University 1 University Road Tainan City70101 Taiwan Department of Physics National Taiwan University Taipei106 Taiwan Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology 123 University Road Yunlin64002 Taiwan Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania 220 S. 33rd St. PhiladelphiaPA19104-6315 United States Department of Mechanical Engineering North Carolina Agricultural and Technical State University GreensboroNC27411 United States Tainan70101 Taiwan

MoS2 is 2D material applicable for electronics, photo-detectors, light-emitting diodes, and solar cells. Since these applications operate at elevated temperatures, determining and controlling the environmental stability of MoS2 is essential. This study uses Raman spectroscopic experiments at elevated temperatures to observe reversible and irreversible changes in 2D MoS2 films with varying thickness, morphology, and substrate to explore the limits of its thermal stability. Molecular dynamics simulations and in-situ X-ray diffraction confirm that thermal expansion causes the Raman reversible spectral shifts. Further analysis reveals irreversible spectral shifts associated with oxidation and strain effects caused by oxidation with two distinct modes. The former is due to the general homogenous thinning of layers from the top layer down through randomly spaced sulfur vacancies. The latter is due to inhomogeneous oxidation, which known to occur as localized pitting at grain boundaries, void formation from nucleation centers, or stress corrosion cracking starting from edges under strain. Segregation of doping and strain contributions confirms higher strain in the edges. Annealing increases the spread of the strain distribution. These results highlight the critical role of strain, resulting from thermal expansion coefficient mismatch between substrates and 2D MoS2 films, on their environmental stability. © 2023 The Authors

关键词： Raman spectroscopy

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Surface Roughness-Induced Changes in Important Physical Features of CoFeSm Thin Films on Glass Substrates during Annealing

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Materials 2023年第21期16卷 6989页

作者： Fern, Chi-Lon Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Lu, Pei-Xin Su, Xuan-Ming Lin, Shih-Hung Lin, Ko-Wei Department of Materials Science and Engineering National Chung Hsing University Taichung40227 Taiwan Department of Materials Science and Engineering I-Shou University Kaohsiung84001 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

Co60Fe20Sm20 thin films were deposited onto glass substrates in a high vacuum setting. The films varied in thickness from 10 to 50 nm and underwent annealing processes at different temperatures: room temperature (RT), 100, 200, and 300 °C. Our analysis encompassed structural, magnetic, electrical, nanomechanical, adhesive, and optical properties in relation to film thickness and annealing temperature. X-ray diffraction (XRD) analysis did not reveal characteristic peaks in Co60Fe20Sm20 thin films due to insufficient growth-driving forces. Electrical measurements indicated reduced resistivity and sheet resistance with increasing film thickness and higher annealing temperatures, owing to hindered current-carrier transport resulting from the amorphous structure. Atomic force microscope (AFM) analysis showed a decrease in surface roughness with increased thickness and annealing temperature. The low-frequency alternating current magnetic susceptibility (χac) values increased with film thickness and annealing temperature. Nanoindentation analysis demonstrated reduced film hardness and Young’s modulus with thicker films. Contact angle measurements suggested a hydrophilic film. Surface energy increased with greater film thickness, particularly in annealed films, indicating a decrease in contact angle contributing to this increase. Transmittance measurements have revealed intensified absorption and reduced transmittance with thicker films. In summary, the surface roughness of CoFeSm films at different annealing temperatures significantly influenced their magnetic, electrical, adhesive, and optical properties. A smoother surface reduced the pinning effect on the domain walls, enhancing the χac value. Additionally, diminished surface roughness led to a lower contact angle and higher surface energy. Additionally, smoother surfaces exhibited higher carrier conductivity, resulting in reduced electrical resistance. The optical transparency decreased due to the smoother surface of C

关键词： Thin films

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