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Effects of refining degree, pulp mixing ratio, and rae-based strength agents on initial wet-web strength of HwBKP-SwBKP sheet

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2020年第1期52卷 110-120页

作者： Kim, Jin-Soo Cho, Byoung-Uk Dept. of Paper Science and Engineering College of Forest and Environmental Science Kangwon National University Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Science Kangwon National University Korea Republic of

Effects of refining degree, HwBKP-SwBKP mixing ratio, and the type and the dosage of strength agents on initial wet - web strength were investigated. Two types of strength agents consisting of PAE (polyamideamine-epichlorohydrin)-PVA (polyvinyl alcohol), and PAE-MP (micropolymer) were applied. It was found that the addition of PAE-PVA or PAE-MP strength agents can improve the initial wet-web strength of HwBKP-SwBKP sheets by increasing the interaction between pulp fibers and by improving dewatering efficiency and then the solids content of the wet-web. The PAE-MP strength agent showed superior dewatering efficiency than the PAE-PVA strength agent, resulting in a higher solids content and a higher initial wet-web strength at a given polymer dosage. However, the PAE-PVA strength agent showed higher initial wet-web strength at a given solids content than the PAE-MP strength agent. In addition, increasing the refining degree and increasing the amount of longer fibers in stock resulted in the improved initial wet-web strength of HwBKP-SwBKP sheets. © 2020 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Mixing

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Preparation of a New Hybrid Mgalldh@Magnetite Activated Charcoal by Hydrothermal Method for Stability and Adsorption Mechanism of Congo Red

SSRN

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SSRN 2024年

作者： Ahmad, Nur Kameda, Tomohito Rahman, Mir Tamzid Rahman, Farzana Lesbani, Aldes Graduate School of Mathematics and Natural Science FMIPA Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia Research Center of Inorganic Materials and Complexes Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia Graduate School of Environmental Studies Tohoku University 6-6-20 Aoba Aramaki Aobaku Sendai980-8579 Japan Department of Chemistry Jahangirnagar University Dhaka Savar1342 Bangladesh Department of Nutrition and Food Engineering Daffodil International University Birulia1216 Bangladesh Master Program of Material Science Graduate School of Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia

Background The removal of hazardous dyes from water by magnetic adsorbents has received significant interest due to their low cost and ease of separation from the solution phase. This study explores the efficacy of a novel hybrid adsorbent, magnetite and activated charcoal-modified MgAl layered double hydroxide (MgAlLDH@MAC), for removing congo red (CR) from aqueous solutions. Methods MgAlLDH@MAC was successfully prepared via a co-precipitation to hydrothermal method and characterized using FE-SEM, FE-STEM, VSM, BET, XRD, FTIR, XPS, and HPLC analysis. Significant findings The incorporation of magnetite and activated charcoal was successful, resulting in excellent adsorption performance for CR and easy separation from the solution due to its magnetic properties. The adsorbent achieved a maximum adsorption capacity of 625 mg/g, which is in line with the Langmuir isotherm and pseudo-second-order kinetic model. Moreover, the adsorbent demonstrated excellent stability and reusability, retaining 91.78% efficiency after five adsorption-desorption. This study offers a fresh viewpoint on creating high-performance LDH adsorbents that remove dyes quickly and effectively using carbon and magnetite materials. © 2024, The Authors. All rights reserved.

关键词： Magnetite

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Effect of calcination temperature on hydrotalcite for organic dye waste elimination from aqueous solution via adsorption

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AIP Conference Proceedings 2023年第1期2540卷

作者： Lina Mahardiani Risma Arinda Finly Khoirunnisa Arabbani 1Chemistry Education Study Program Faculty of Teacher Training and Education Sebelas Maret University Surakarta Indonesia 2Material Science and Engineering Program National Taipei University of Technology Taipei Taiwan

Hydrotalcite as one of the advanced materials is applied in wide range of aspects like adsorption. This research aims to study the capability of the hydrotalcite like compound Mg-Al-CO3 material to remove the organic dye, namely, congo red and methylene blue in water through adsorption. Prior to the adsorption process, hydrotalcite like compound Mg-Al-CO3 was calcined within temperature ranges of 300-750°C. The adsorption process was carried out by batch method with variations in calcination temperature of the hydrotalcite material and variations in contacting time. The performance effectiveness of hydrotalcite was evaluated through the adsorption percentages based on the absorbance measurement data using the UV-Vis instrument. The results showed excellent hydrotalcite's capability of removing both organic dyes. Hydrotalcite calcined at 600°C was able to remove 94% of the organic dyes within 30 minutes.

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Novel Biodegradable Ca–P/Ti–F Composite Conversion Coatings for Improving the Corrosion Resistance of Medical Magnesium materials

SSRN

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SSRN 2024年

作者： Sun, Ying-Sui Chu, Peng-Wei Cheng, An-Yu You, Jhu-Lin Chang, Tsung-Ming Jian, Shun-Yi Chi, Chun-Shang Liu, Yu-Cheng Chang, Chin-Jou School of Dental Technology College of Oral Medicine Taipei Medical University Taipei Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu300044 Taiwan Department of Chemical & Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan335 Taiwan System Engineering and Technology Program National Chiao Tung University Hsinchu300 Taiwan Department of Material Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Center for Plasma and Thin Film Technology Ming Chi University of Technology New Taipei243303 Taiwan Combination Medical Device Technology Division Medical Devices R&D Service Department Metal Industries Research & Development Centre Kaohsiung802 Taiwan

Mg and its alloys are characterized by favorable biocompatibility and nontoxicity, and these properties have stimulated considerable research interest in their application as degradable biomaterials for medical implants. However, the clinical application of these materials is restricted by their rapid degradation. Therefore, this study designed a surface modification method for Mg and Mg alloys to enable them to satisfy clinical requirements. A two-step conversion coating method was applied to pure Mg. Pure Mg samples were first coated with calcium phosphate (Ca–P), following which they were coated with titanium fluoride (Ti–F), resulting in the production of Mg samples coated with a bioactive Ca–P/Ti–F composite. The composition of the coated samples was investigated through energy-dispersive X-ray spectroscopy with transmission electron microscopy, and their morphology was characterized through scanning electron microscopy. Moreover, hydrogen evolution measurements in simulated body fluid (SBF), electrochemical impedance spectroscopy, and polarization curves were employed to evaluate the samples’ corrosion resistance. The prepared composite conversion coatings had an average thickness of approximately 350 nm, and their corroded area was less than 5% of their total area following their immersion in SBF for 72 h. Thus, the prepared Ca–P/Ti–F composite conversion coatings effectively inhibited Mg corrosion in SBF. Moreover, the attachment and differentiation of MG-63 cells on the prepared coatings were observed. © 2024, The Authors. All rights reserved.

关键词： Energy dispersive spectroscopy

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Collective treadmilling in fire ant rafts permits sustained protrusion growth

arXiv

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arXiv 2020年

作者： Wagner, Robert J. Such, Kristen Hobbs, Ethan Vernerey, Franck J. University of Colorado Boulder Mechanical Engineering Department Material Science and Engineering Program United States University of Colorado Boulder Mechanical Engineer Department United States University of Colorado Boulder Computer Science Department Interdisciplinary Quantitative Biology Program United States University of Colorado Boulder Mechanical Engineer Department Material Science and Engineering Program United States

Condensed active matter is exemplary for its capacity to morph and exhibit internal flows despite remaining cohered. (1) To facilitate understanding of this ability, we investigate the cause of finger-like protrusions that emerge from super-organismal, aggregated rafts of fire ants (Solenopsis invicta). While these features are easily observed, what permits their recuring initiation, growth, and recession is not immediately clear. Ants rafts are comprised of a floating, structural network of interconnected ants on which a layer of freely active ants walks. We show here that sustained shape evolution is permitted by treadmilling defined by the competition between perpetual raft contraction due to displacement of bulk structural ants into the active layer, and outwards raft expansion due to deposition of free ants into the structural network at the edges. Furthermore, we see that protrusions emerge due to asymmetries in the edge deposition rate of surface ants, and we provide strong evidence that these asymmetries occur stochastically due to wall accumulation effects and local alignment interactions. Together these effects permit the cooperative, yet spontaneous formation of protrusions that fire ants utilize for functional exploration and to escape flooded environments. Ant raft dynamics mirror the treadmilling that facilitates morphogenesis and motility of cytoskeletons (2, 3), thus providing another example in which reshaping of condensed active matter is explained by free constituent transport, yet whose continuance relies on perpetual phase transition between structural and free members. © 2020, CC BY-NC-SA.

关键词： Deposition rates

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Inorganic Ions Activate Lineage-Specific Gene Regulatory Networks to Drive Stem Cells Differentiation

SSRN

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SSRN 2023年

作者： Kersey, Anna L. Gaharwar, Akhilesh K. Singh, Irtisha Department of Biomedical Engineering College of Engineering Texas A&M University College StationTX77843 United States Department of Cell Biology and Genetics College of Medicine Texas A&M University College StationTX77843 United States Interdisciplinary Program in Genetics Texas A&M University College StationTX77843 United States Center for Remote Health Technologies and Systems Texas A&M University College StationTX77843 United States Department of Material Science and Engineering Dwight Look College of Engineering Texas A&M University College StationTX77843 United States

Ions released from inorganic biomaterials play a vital role in defining cell identity. However, the effect of inorganic ions on cellular functions has yet to be investigated at the transcriptomic level, representing a critical knowledge gap in the development of next-generation of bioactive materials. To address this gap, we investigated the impact of various inorganic ions including silver, copper, titanium, and platinum on human stem cells. Our finding showed that silver and copper induce osteogenic and chondrogenic differentiation respectively, through enrichment of ion-dependent signaling pathways. Specifically, silver effectively induced Wnt and MAPK signaling, which are vital for osteogenesis. On the other hand, copper specifically stimulated TGFβ signaling, while suppressing JAK-STAT signaling, thereby promoting chondrogenesis. In contrast, platinum, tantalum, and titanium ions didn't stimulate regenerative responses. Titanium displayed minimal gene expression changes, demonstrating its relative inertness, while platinum and tantalum induced oxidative stress. These findings are further supported by gene and protein level validation using traditional techniques. Together, our findings highlight the potential of inorganic biomaterials in revolutionizing tissue regeneration strategies, which currently rely largely on growth factors and small molecule therapeutics. © 2023, The Authors. All rights reserved.

关键词： Stem cells

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A triboelectric nanogenerator-based tactile sensor array system for monitoring pressure distribution inside prosthetic limb

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Nano Energy 2023年 111卷

作者： Chang, Kuie-Bin Parashar, Parag Shen, Li-Chien Chen, An-Rong Huang, Yan-Tsz Pal, Arnab Lim, Kee-Chin Wei, Po-Han Kao, Fu-Cheng Hu, Jin-Jia Lin, Zong-Hong Department of Mechanical Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Biomedical Engineering National Taiwan University Taipei Taiwan Department of Material Science and Engineering National Tsing Hua University Hsinchu Taiwan Institute of Biomedical Engineering National Tsing Hua University Hsinchu Taiwan International Intercollegiate PhD Program National Tsing Hua University Hsinchu Taiwan Department of Orthopaedic Surgery Chang Gung Memorial Hospital Taoyuan Taiwan College of Medicine Chang Gung University Taoyuan Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan

In the prosthetic field, quantifying interfacial pressure distribution between the amputee's residual limb and the socket's internal environment is imperative for developing new technologies. However, the commercially available pressure sensors have several disadvantages, namely external power supply requirements, low stability, high cost, and complexities related to integrating the sensor system into prosthetic devices. Herein, we propose a self-powered triboelectric nanogenerator (TENG) based flexible tactile sensor array system to monitor prosthetic socket internal pressure distribution in real-time. The proposed sensor consists of biocompatible polydimethylsiloxane (PDMS) polymer and polycaprolactone (PCL) nanofiber membranes as triboelectric materials. The biodegradable PCL nanofiber membrane, fabricated via a scalable and cost-effective electrospinning process, possesses a high surface area-to-volume ratio, facilitating enhanced charge generation during triboelectrification. The as-fabricated TENG-based tactile sensor is highly stable up to 10,000 cycles. Furthermore, the voltage of the tactile sensor is independent of different temperature and humidity values, demonstrating the stability of the sensor under various environmental conditions. Finally, we successfully integrated the tactile sensor array within a prosthetic device to monitor real-time pressure distribution inside the prosthetic socket during gait simulation. We believe that the proposed novel design provides a new dimension for the rapid development of self-powered, low-cost, and highly stable pressure monitoring systems with considerable potential for commercialization. © 2023 Elsevier Ltd

关键词： Electrospinning

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Profile of bovine teeth potency as hydroxyapatite scaffold

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AIP Conference Proceedings 2023年第1期2536卷

作者： Endanus Harijanto Anita Yuliati Prihartini Widiyanti Dental Material Department Faculty of Dentistry Universitas Airlangga Surabaya Indonesia Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

Background: Bone destructions in the oral cavity are due to trauma, chronic infection, congenital malformations, or resection surgery, most often by using an autologous bone graft technique. The problem using this technique are limited donors and suppliers, high cost, host potential imune response becauce accepts foreign bone tissue also potential transmission diseases. Another solution in tissue engineering techniques is using the scaffold. Hidroxyapatite is one of the osteoconductive potentialy ceramic materials in scaffold fabrication. Objective: To prove that bovine teeth hydroxyapatite have characteristic as scaffold for bone tissue regeneration. Methods: HA was obtained by calcining bovine teeth at 1000°C for 3 hours, Fourier Transform Infra Red Spectroscopy (FTIR) test , Energy Dispersive X-Ray (EDX) test and X-Ray Diffraction (XRD) test. Results: Bovine teeth hydroxyapatite to showed of hydroxyl, phosphate and carbonate functional groups (FTIR test). Average Ca/P=1.97. Conclusion: Hydroxyapatite from bovine teeth has potency as scaffold through the chemistry and physical characteristics.

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Effects of chain-chain interaction on the configuration of short-chain alkanethiol self-assembled monolayers on a metal surface

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Journal of Chemical Physics 2024年第21期160卷 214711-214711页

作者： Liao, Chia-Li Faizanuddin, Syed Mohammed Haruyama, Jun Liao, Wei-Ssu Wen, Yu-Chieh Department of Chemistry National Taiwan University Taipei 10617 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu 300044 Taiwan Solid State Chemistry Laboratory Cluster for Pioneering Research RIKEN Wako 351-0198 Japan Center for Emerging Material and Advanced Devices National Taiwan University Taipei 10617 Taiwan

Surface-specific sum frequency generation vibrational spectroscopy is applied to study the molecular configuration of short-chain n-alkanethiol self-assembled monolayers (SAMs with n = 2-6) on the Au surface. For monolayers with n ≥ 3, the alkanethiols are upright-oriented, with the CH₃ tilt angle varying between ∼33° and ∼46° in clear even-odd dependency. The ethanethiol monolayer (n = 2) is, however, found to exhibit a distinct lying-down configuration with a larger methyl tilt angle (67°-79°) and a smaller CH₂ tilt angle (56°-68°). Such a unique configurational transition from n = 2 to n ≥ 3 discloses the steric effect owing to chain-chain interaction among neighboring molecules. Through density functional theory calculations, the transition is further confirmed to be energetically favorable for thiols on a defective reconstructed Au(111) surface but not on the pristine one. Our study highlights the roles of the chain-chain interaction and the substrate surface atomic structure when organizing SAMs, offering a strategic pathway for exploiting their applications. © 2024 Author(s).

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CuO NWs boosted triboelectric microfluidic nanosensor functionalized by collagen-protein interactions for real-time platelet count monitoring

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Chemical engineering Journal 2024年 490卷

作者： Lin, Jia-Cheng Kaswan, Kuldeep Chatterjee, Subhodeep Wu, Yu-Wen Kumar Sharma, Manish Ranjan, Ashok Roy Barman, Snigdha Lin, Yu-Zih Burnouf, Thierry Boireau, Wilfrid Lu, Ming-Yen Tu, Yong-Kwang Su, I-Chang Wu, Ping-Hsiu Lin, Zong-Hong Fan, Yu-Jui School of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Taipei Neuroscience Institute Taipei Medical University Taipei11031 Taiwan Department of Biomedical Engineering National Taiwan University Taipei11031 Taiwan International Intercollegiate PhD Program National Tsing Hua University Hsinchu30013 Taiwan Department of Power Mechanical Engineering National Tsing Hua University Hsinchu30013 Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering Taipei Medical University Taipei11031 Taiwan Department of Material Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan Institute of Biomedical Engineering National Tsing Hua University Hsinchu30013 Taiwan International PhD Program in Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Université de Franche-Comté CNRS Institut FEMTO-ST BesançonF-25030 France Department of Neurosurgery Shuang Ho Hospital Taipei Medical University New Taipei City23561 Taiwan Department of Surgery School of Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan Department of Radiology School of Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan Department of Radiation Oncology Taipei Medical University Hospital Taipei11031 Taiwan Center for Precision Health and Quantitative Sciences Taipei Medical University Hospital Taipei 11031 Taiwan

Blood platelet count significantly affects the development of severe conditions like myocardial infarction, peripheral arterial ischemia, respiratory compromise, stroke, diabetes, coronavirus disease 2019 (COVID-19), along with chemotherapy patients and those suffering cardiovascular diseases (CVDs). These conditions necessitate frequent monitoring of platelet counts to guide diagnostic and therapeutic decisions. However, existing techniques are relatively time-consuming, lack of accuracy and require precise operation. The emergence of these severe diseases underscored the need to develop advanced platelet count-monitoring techniques which are rapid, highly precise, and conveniently portable for point-of-care applications. In this study, we emphasized the development of a triboelectric microfluidic nanosensor (TMNS) for platelet quantification through the assessment of flow resistance. The functionality of TMNS device is based on immobilization of platelets on a collagen layer coated inside a microfluidic channel. The triboelectric voltage output is measured as a detection signal of the flow resistance and is enhanced by incorporating high surface area copper oxide nanowires (CuO NWs) on the interior of copper tubes. These copper tubes serve as terminal electrodes and for flow guiding. The flow resistance of plasma solutions is elevated when the platelet concentration increases due to heightened adherence of platelets onto the collagen layer. Variations in flow resistance induce alterations in contact electrification, causing changes in output voltage at load terminals. Fine-tuning of the TMNS device was achieved by optimizing the channel width and length, flowing liquid viscosity, and voltage measurement technique. Platelet quantification sensing data were acquired through the combination of platelet-rich plasma (PRP) and platelet-poor plasma (PPP) solutions. The described device exhibits promising capabilities for platelet-count monitoring in whole-blood samples c

关键词： Copper oxides

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