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Effect of PVAm Application for Fine Paper on Effectiveness of Optical Brightening Agent

Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2016年第3期48卷 23-29页

作者： Cho, Byoung-Uk Won, Jong Myoung Program of Paper Science & Engineering Division of Forest Material Science & Engineering College of Forest & Environmental Sciences Kangwon National University Gang-won-Do Chuncheon24341 Korea Republic of

Effects of cationic polyvinylamine (PVAm) dry strength agent on effectiveness of optical brightening agent (OBA) during fine papermaking and the mechanism for brightness reduction of paper by PVAm was investigated by UV/Vis spectroscopy and turbidity measurement of OBA solution with PVAm. It was shown that PVAm reduced brightness of paper while opacity was not varied and tensile strength of paper was increased. Tetra-type OBA solution showed the peaks around the wavelength of 280 nm and 330 nm and the increase in the OBA concentration increased the UV absorbance in all wavelength. Addition of PVAm into the OBA solution decreased the UV absorbance at 280 nm. Turbidities of OBA and PVAm solutions were close to zero, respectively, while the turbidity value increased for the mixed solution of OBA and PVAm in various mixing ratios and the highest value was obtained when the mixing ratio of PVAm and OBA was 5:5, meaning that cationic PVAm formed complex with anionic OBA. In conclusion, cationic PVAm could form a complex with anionic OBA and that reduced UV absorbance, resulting in the reduced brightness of paper. © 2016 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Luminance

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Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe

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Journal of Advanced Ceramics 2021年第4期10卷 860-870页

作者： Wenjing XU Zhongwei ZHANG Chengyan LIU Jie GAO Zhenyuan YE Chunguang CHEN Ying PENG Xiaobo BAI Lei MIAO Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo 135-8548Japan

Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe;yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal *** this work,we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity,contributing to a final promotion of figure of *** one hand,the carrier concentration and band offset between valence bands are concurrently reduced,promoting the power factor to a highest value of-2436μW·m^(-1)·K^(-2) at 873 *** the other hand,lots of dislocations(~3.16×10^(7)mm^(-2))associated with impurity precipitates are generated,resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m^(-1)·K^(-1) at 873 *** a result,a substantial thermoelectric performance enhancement up to zT≈1.0 at 873 K is obtained for the sample Sn0.94Ag0.09La0.05Te,which is twice that of the pristine SnTe(zT≈0.49 at 873 K).This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance.

关键词： SnTe band convergence dislocation Ag and La co-doping thermoelectric performance

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Bending strength performance evaluation of glass fiber cloth reinforced cylindrical laminated veneer lumber

Journal of the Korean Wood Science and Technology

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Journal of the Korean Wood science and Technology 2016年第3期44卷 415-423页

作者： Lee, In-Hwan Hong, Soon-Il Division of Forest Material Science and Engineering Program of Forest Biomaterials Engineering College of Forest and Environmental Sciences Kangwon National University Chuncheon24341 Korea Republic of

Cylindrical laminated veneer lumber (LVL) is produced by winding the veneer tape on a circular cylinder. The veneer tape was produced by cutting the veneer into a rectangular shape and sewing it in a vertical direction to the fiber. The tensile strength test was carried out by producing the veneer tape specimen with different species of veneer, types and combinations of sewing yarn. The Radiata pine veneer tape produced with three sewing lines using the reinforced sewing thread had the best tensile strength. Also, the separation and snapping problems of the veneer tape were improved, resulting in the improvement in the workability of cylindrical LVL. The bending strength of various cylindrical LVL produced with different types of veneer tape and a different number of lamination layers and the application of reinforcement with glass fiber cloth was compared with that of Larix log. Bending MOR of cylindrical LVL reinforced with glass fiber cloth at the volume ratio of 11% was improved by 65% in comparison to the non-reinforced cylindrical LVL. In the case of the cylindrical LVL produced with 2 sewing lines of veneer tape, a fracture occurred at the butt joint between the veneer tapes. However, in the case of the cylindrical LVL produced with 3 sewing lines of veneer tape a fracture occurred in the fiber direction.

关键词： Glass fibers

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Facile Li-Ion Transport via LLTO Scaffold with Crosslinked Polyethylene Glycol Composite Electrolyte for Solid-State Batteries

SSRN

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SSRN 2025年

作者： Lee, Jungkuk Counihan, Michael J. Barai, Pallab Burns, Meghan E. Singh, Vibhu V. Jamnuch, Sasawat Pascal, Tod A. Shrinivasan, Venkat Tepavcevic, Sanja Zhang, Yuepeng Applied Materials Division Argonne National Laboratory LemontIL60439 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Department of Chemistry University of Illinois Chicago ChicagoIL60607 United States ATLAS Materials Physics Lab Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California San Diego La Jolla CA92093 United States Microscopy and Microanalysis Research Group Materials Measurement Science Division National Institute of Standards and Technology GaithersburgMD20899 United States Material Science and Engineering Program University of California San Diego La Jolla CA92093 United States Chemical Sciences and Engineering Division Argonne National Laboratory LemontIL60439 United States

Composite polymer electrolytes (CPEs) hold significant promise for solid-state batteries due to their ability to combine the benefits of inorganic fillers and polymer matrices. However, agglomeration of inorganic fillers can disrupt the formation of a percolation pathway, hindering lithium-ion transport. Here, we developed a stable, porous, and interconnected 3-dimentional LLTO (Li0.33La0.557TiO3) nanofiber scaffold and fabricate CPEs using in-situ crosslinked polyethylene glycol (xPEG). The resulting self-standing LLTOxPEG-65 achieved an ionic conductivity of 5.0 × 10−4 S/cm at 30 °C and a critical current density of 0.5 mA/cm2. A significantly lower activation energy (~0.2 eV) was observed in LLTOxPEG-65 compared to pristine xPEG (0.44 eV), indicating a transition of lithium-ion transport pathways from xPEG to the LLTO scaffold. However, increasing the xPEG content led to a decrease in ionic conductivity and a rise in activation energy, approaching that of pristine xPEG. DFT calculations revealed that Li+ transport in the [010] and [001] planes of LLTO predominantly takes place within the bulk rather than along the surface, while a concerted diffusion mechanism was observed in the [100] plane. Additionally, mesoscale-level computational analysis indicated that the high LLTO scaffold fraction (90 wt %) can ensure transport through the bulk of the fibers even with larger interfacial charge transfer resistance, around 1 Ω·cm2 between LLTO and xPEG. Presence of the highly percolated LLTO scaffold helps to promote efficient Li+ transport through the bulk of LLTO. © 2025, The Authors. All rights reserved.

关键词： Activation energy

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Bending and bonding strength performances of larix block-glued glulam

Journal of the Korean Wood Science and Technology

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Journal of the Korean Wood science and Technology 2016年第3期44卷 315-322页

Block-glued glulam is a structural material that can be used as a construction member of a large-section wooden building, which is produced by edgewise bonding of two or more glulam beam elements. The edgewise bonding performance of the block-glued glulam was examined through delamination test and block shear strength test. According to the test results, the block-glued glulam that was manufactured with 1.5 MPa of compressive pressure after applying 500 g/m2 of Resorcinol adhesive showed the best edgewise bonding performance. The block-glued glulam produced in a good edgewise bonding condition was compared with a control glulam with the same section modulus for bending strength performance. The modulus of elasticity (MOE) in bending was similar to that of the control glulam. The modulus of rupture (MOR) of the block-glued glulam was higher by 27% than that of the control glulam. No interfacial failure or cohesive failure were observed in the edgewise bonding layer.

关键词： Bending strength

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Enviromentally friendly poly(urea imide) coating with remarkable anti-corrosion property and durability 72

Enviromentally friendly poly(urea imide) coating with remark...

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72nd Annual Technical Conference of the Society of Plastics Engineers: The Plastics Conference, ANTEC 2014

作者： Feng, Linqian Iron, Jude O. Material Science and Engineering Program University of Cincinnati CincinnatiOH United States

ISBN: (纸本)9781634397087

A novel class of poly(urea imide) (PUI) coatings were successfully prepared by in-situ condensation polymerization, followed by solution casting and thermal imidization. The structure and properties of PUI coatings were controlled by controlling the concentration of co- monomers. The resulting PUI coatings have shown remarkable enhancements in anti-corrosion property and coating durability, determined by direct current polarization (DCP) in 3.5 wt% NaCl solution. The evaluation of coating lifetimes was done by using information obtained from time-based polarization resistance study and the optimized PUI coating has estimated lifetime greater than seven years in sea water. Copyright © (2014) by the Society of Plastics Engineers.

关键词： Sodium chloride

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Additive manufacturing of surface structured metal parts for high strength lightweight injection overmolded polymer-metal hybrid joints

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International Journal of Adhesion and Adhesives 2025年 141卷

作者： G.H.M. Oliveira V.F. Sciuti R.B. Canto S. Arneitz L. Minkowitz S.T. Amancio-Filho L.B. Canto Department of Materials Engineering (DEMa) Graduate Program in Materials Science and Engineering (PPGCEM) Federal University of Sao Carlos (UFSCar) Sao Carlos SP Brazil Institute of Material Science Joining and Forming—Professorship “Aviation Materials and Manufacturing Techniques” Graz University of Technology 8010 Graz Austria

Polymer-metal hybrid structures (PMH) are increasingly used in the automotive and aerospace industries for lightweight applications. In this study, we investigate the integration of emerging additive manufacturing with injection overmolding to produce high-strength lightweight hybrid joints. AlSi10Mg substrates, with and without submillimeter-sized mushroom-shaped surface structures, were additively manufactured using laser powder bed fusion (L-PBF), followed by injection overmolding (IOM) with polycarbonate (PC). Overlap joints with structured metal substrates demonstrated remarkable joining strength (20.5 ± 3.8 MPa), primarily attributed to the micro-mechanical interlocking between the consolidated polymer and the metal surface structure. Fracture analysis revealed two primary modes of cohesive failure (stretching and shear) in the mushroom-shaped structures, contingent on their location on the metal surface. This behavior was attributed to a combination of interfacial shear stress and secondary bending, as elucidated by digital image correlation (DIC) analysis. The fatigue life of hybrid joints was determined to be 38 % of the joining strength at 10 6 cycles, indicating excellent mechanical performance and high potential for engineering applications.

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Dual functional antibacterial nanofiber membranes: Polyhexamethylene biguanide-integrated alginate-chitosan-dye modified polyamide 56 for single-use biomedical applications

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International Journal of Biological Macromolecules 2025年 310卷 143331页

作者： Liao, Ting-Cjia Le, Quang-Vinh Hanh, Nguyen The Duc Liu, Bing-Lan Srinophakun, Penjit Prapainainar, Paweena Chiu, Chen-Yaw Wang, Chi-Yun Ng, I-Son Chen, Kuei-Hsiang Chang, Yu-Kaung of Biochemical Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Center for Environmental Sustainability and Human Health Ming Chi University of Technology Taishan New Taipei City243303 Taiwan Department of Applied Chemistry Chaoyang University of Technology Taichung413310 Taiwan National Center of Excellence for Petroleum Petrochemicals and Advance Material Department of Chemical Engineering Faculty of Engineering Kasetsart University Chatuchak Bangkok10900 Thailand Center for Advanced Studies in Nanotechnology for Chemical Food and Agricultural Industries Kasetsart University Chatuchak Bangkok10900 Thailand Department of Chemical Engineering Ming Chi University of Technology New Taipei City243303 Taiwan International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan Departmental of Chemical Engineering National Cheng Kung University Tainan70101 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Zhongli Dist. Taoyuan City320315 Taiwan

Polyamide 56 (PA56) nanofiber membranes were functionalized with alginate (AG), chitosan (CS), reactive dyes (RG19, RR141), and poly(hexamethylene biguanide) (PHMB) to develop multifunctional antimicrobial membranes for single-use applications. The resulting membranes, PA56-AG-CS-RG19-PHMB and PA56-AG-CS-RR141-PHMB, achieved high antibacterial efficiencies of 97.12 % and 90.65 %, respectively, against Escherichia coli, demonstrating potent bacterial inhibition. The antimicrobial performance results from a synergistic dual mechanism. Chitosan disrupts bacterial adhesion and biofilm formation through electrostatic interactions, while PHMB compromises membrane integrity and interferes with intracellular processes. This combined action enhances bactericidal efficacy. The functionalization strategy also maintained excellent biocompatibility, with minimal cytotoxicity observed in L929 fibroblasts. Optimized concentrations of AG and CS were systematically evaluated to ensure balanced antibacterial performance and mechanical stability. These membranes, designed for single-use, exhibited significantly reduced antibacterial activity upon reuse, supporting their intended application. Overall, the integration of chemical and physical antimicrobial strategies within a nanofiber matrix presents a novel and effective approach. This strategy enables the development of next-generation materials suitable for real-world single-use biomedical applications, including wound dressings, food packaging, and protective textiles. © 2025 Elsevier B.V.

关键词： Escherichia coli

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Opto-thermal induced flow enables faster trapping in nanoaperture Tweezers

Opto-thermal induced flow enables faster trapping in nanoape...

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2020 Frontiers in Optics Conference, FiO 2020

作者： Kotnala, Abhay Kollipara, Pavana Siddhartha Zheng, Yuebing Walker Department of Mechanical Engineering Material Science and Engineering Program Texas Material Institute The University of Texas AustinTX78712 United States

Opto-thermal induced flow was integrated with nanoaperture tweezers to overcome the diffusion-limited trapping process, which resulted in more than an order-of-magnitude reduction in particle trapping time. © OSA... 详细信息

ISBN: (纸本)9781943580804

关键词： Gold Lasers Multimode fibers Nanoparticles Range finding

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Stress measurements in the Sioux Falls quartzite and the state of stress in the Midcontinent 31

Stress measurements in the Sioux Falls quartzite and the sta...

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31st U.S. Symposium on Rock Mechanics, USRMS 1990

作者： Haimson, B.C. Geological Engineering Program Department of Material Science and Engineering University of Wisconsin MadisonWI United States

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