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Highly conductive and tough double-network hydrogels for smart electronics

SmartMat 2024年第2期5卷 54-66页

作者： dong Zhang Yijing Tang Xiong Gong Yung Chang Jie Zheng Department of Chemical Biomolecularand Corrosion EngineeringThe University of AkronAkronOhioUSA School of Polymer Science and Polymer Engineering The University of AkronAkronOhioUSA R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian UniversityTaiwanChina

development and understanding of highly mechanically robust and electronically conducting hydrogels are extremely important for ever-increasing energy-based *** mixing/blending of conductive additives with hydrophilic polymer network prevents both high mechanical strength and electronic conductivity to be presented in polymer ***,we proposed a double-network(dN)engineering strategy to fabricate PVA/PPy dN hydrogels,consisting of a conductive PPy-PA network via in-situ ultrafast gelation and a tough PVA network via a subsequent freezing/thawing *** resultant PVA/PPy hydrogels exhibited superior mechanical and electrochemical properties,including electrical conductivity of~6.8 S/m,mechanical strength of~0.39 MPa,and elastic moduli of~0.1 *** further transformation of PVA/PPy hydrogels into supercapacitors,they demonstrated a high capacitance of~280.7 F/g and a cycle life of 2000 galvanostatic charge/discharge cycles with over 94.3%capacity retention at the current density of 2 mA/cm2 and even subzero temperatures of−20℃.Such enhanced mechanical performance and electronic conductivity of hydrogels are mainly stemmed from a synergistic combination of continuous electrically conductive PPy-PA network and the two interpenetrating dN *** in-situ gelation strategy is applicable to the integration of ionic-/electrical-conductive materials into dN hydrogels for smart-soft electronics,beyond the most commonly used PEdOT:PSS-based hydrogels.

关键词： conducting polymers double-network hydrogels smart electronics supercapacitors

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A novel clover-like COFs membrane fabricated via one-step interfacial polymerization for dye/salt separation

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JOUrNAL OF membrane science 2023年第1期673卷

作者： Fang, Yin-Xin Lin, Yu-Fei Xu, Zhen-Liang Mo, Jia-Wei Li, Ping-Ping East China Univ Sci & Technol Chem Engn Res Ctr Sch Chem Engn State Key Lab Chem EngnMembrane Science& Engn R&D 130 Meilong Rd Shanghai 200237 Peoples R China

Covalent organic frameworks (COFs) membranes have exhibited great applications in wastewater treatment due to their highly ordered porous architecture. Currently, numerous studies have focused on the hexagonal-structured COFs synthesized with linear C2 and C3 precursor. However, the C2 monomer is limited-variety and high-cost. Herein, a novel clover-like structure COFs membrane is successfully fabricated for the first time. Meta-position monomer m-phenylenediamine (MPd) and 1,3,5-triformylbenzene (TFB) are used to syn-thesize the clover-like COFs membrane by interfacial polymerization (IP) method on the nylon substrate directly. The optimized MPd-TFB/Nylon membrane shows excellent water permeance of 94.4 L m- 2 h-1 bar-1, which is higher than hexagonal-structured COFs membrane, in Congo red (Cr) and NaCl mixed solution The rejections are 98.6% for Cr and 2.9% for NaCl. This work opens a novel route for designing the COFs membrane with clover-like channels, manifesting the usage of linear C2 monomers is unnecessary. Besides, it has been found that the unique clover-like structure can improve the water molecular transport path under the same dye molecules deposition situation compared with hexagonal structure COFs membrane.

关键词： Covalent organic frameworks membrane Clover-like structure Interfacial polymerization dye salt separation

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Modification of gelatin and photocured 3d-printed resin to prepare biomimetic phantoms for ultrasound-guided minimally invasive surgeries

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Polymer engineering and science 2023年第2期63卷 413-425页

作者： Chen, Chien-Hua Huang, Yi-Fan Chen, Po-Hao Hsu, Yu-Tung Jaw, Fu-Shan Ho, Ming-Hua Department of Biomedical Engineering National Taiwan University Taipei City Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei City Taiwan R&D Center for Membrane Technology National Taiwan University of Science and Technology Taipei Taiwan

The main challenge of ultrasound-guided minimally invasive surgeries is to carry out treatments through small boreholes in the patient's body surface with sub-millimetric accuracy and facility offered by ultrasound instruments. Thus, the phantoms' biomimetic appearances, acoustic characteristics, and mechanical properties are essential for healthcare professionals. In this study, gelatin and 3d-printed photo-resin phantoms were developed for hard and soft tissues, respectively. Using glutaraldehyde (GA) and formaldehyde (FA) to crosslink gelatin phantoms, the mechanical strength, ultrasound velocity, acoustic impedance, needle insertion forces, and antiseptic periods were improved, and the addition of silica nanoparticles raised the acoustic impedance. For 3d-printed phantoms, the acoustic impedance ascended with hydrophilic polyethylene glycol diacrylate (PEGdA) oligomers. The additives applied in this study successfully made the gelatin and photo-resin phantoms more mimetic to muscle and bone tissues, allowing their application in preoperative preparations. © 2023 The Authors. Polymer engineering & science published by Wiley Periodicals LLC on behalf of Society of Plastics Engineers.

关键词： 3d printers

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Intrinsic microporous poly(phenyl-alkane)s with pendent piperazinium for high performance anion exchange membrane fuel cells

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JOUrNAL OF membrane science 2024年 700卷

作者： Li, Ziliang Gao, Li Liu, Jie Chen, Wanting Li, Xiangcun Wu, Xuemei Jiang, Xiaobin He, Gaohong Yan, Xiaoming Dalian Univ Technol R&D Ctr Membrane Science& Technol Sch Chem Engn State Key Lab Fine Chem 2 Linggong Rd Dalian 116024 LN Peoples R China Dalian Univ Technol Sch Chem Engn Ocean & Life 2 Dagong Rd Panjin 124221 LN Peoples R China

Exploring anion exchange membranes (AEMs) with high conductivity and satisfactory stability is very meaningful for the advancement of alkaline fuel cells. Herein, a novel class of intrinsic microporous AEMs with pendent piperazinium are systematically fabricated for alkaline fuel cell performance testing. Contorted and rigid spirobisindane backbone structure expands the free volume of AEMs, inducing broad and interconnected ion transport channels. This unique feature endows membranes a leading advantage for the efficient transmission of hydroxide ions. Consequently, the prepared membrane displays excellent normalized hydroxide conductivity of 78.99 mS g cm -1 mmol -1 at 80 degrees C. Meanwhile, the hydroxide conductivity degrades by only 8.3 % after treatment in 1 M NaOH for 1000 h at 80 degrees C. Moreover, the peak power density of H 2 /O 2 single cell employing this membrane exhibits 1.06 W cm -2 at 80 degrees C and the cell can preserve 93.0 % of its initial voltage after operating for 18 h.

关键词： Anion exchange membranes Spirobisindane Free volume Normalized hydroxide conductivity Fuel cells

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Ultrathin polyamide nanofiltration membrane prepared by triazine-based porous organic polymer as interlayer for dye removal

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Chinese Journal of Chemical engineering 2023年第5期57卷 193-201页

作者： Yongbo Liu Zhihao Si Cong ren Hanzhu Wu Peng Zhan Yuqing Peng Peiyong Qin National Energy R&D Center for Biorefinery Beijing University of Chemical TechnologyBeijing 100029China College of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Membrane Science and Technology College of ChemicalEngineeringBeijing University of Chemical TechnologyBeijing 100029China

Separation membrane with high flux is generally encouraged in industrial application,because of the tremendous needs for decreasing membrane areas,usage costs and space *** most effective and direct method for obtaining the high flux is to decrease membrane ***(PA)nanofiltration membrane is conventionally prepared by the direct interfacial polymerization(IP)on substrate surface,and results in a thick PA *** this work,we proposed a strategy that constructing triazine-based porous organic polymer(TrZ-POP)as the interlayer to prepare the ultrathin PA nanofiltration ***-POP is firstly deposited on the polyethersulfone substrate,and then the formed TrZ-POP provides more adhesion sites towards PA based on its high specific surface *** chemical bonding between terminal amine group of TrZ-POP and the amide group of PA further improves the binding force,and strengthens the stability of PA *** importantly,the high porosity of TrZPOP layer causes the higher polymerization of initial PA owning to the stored sufficient amino monomer;and H-bonding interaction between amine groups of TrZ-POP and piperazine(PIP)can astrict the release of ***,IP process is controlled,and the thinnest thickness of prepared PA layer is only<15 *** expected,PA/TrZ-POP membrane shows a more excellent water flux of 1414 L·m^(-2)·h^(-1)·MPa^(-1)than that of the state-of-the-art nanofiltration membranes,and without sacrificing dye *** build of TrZPOP interlayer develops a new method for obtaining a high-flux nanofiltration membrane.

关键词： Polyamide Nanofiltration Interfacial polymerization Triazine-based porous organic polymer

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Anion exchange membranes with partially flexible ether segments achieving high energy efficiency and capacity retention in NAOrFBs

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CHEMICAL engineering JOUrNAL 2025年 505卷

作者： Peng, Shiqi Yao, Shengxin Lu, Siwen Ji, Chao Gao, Li dai, Qiuxia Yan, Xiaoming Chen, Liuping He, Gaohong Dalian Univ Technol R&D Ctr Membrane Science& Technol State Key Lab Fine Chem Dalian 116023 Peoples R China Dalian Univ Technol Sch Chem Engn Ocean & Life Panjin 124221 Peoples R China Chinasalt Jintan Co Ltd Jiangsu Engn Res Ctr Comprehens Utilizat Well & Ro Changzhou 213200 Peoples R China

Ion exchange membranes with high ionic conductivity and selectivity are indispensable for the operation of neutral aqueous organic redox flow batteries (NAOrFBs). While ion exchange membranes based on microphase separation can enhance conductivity by enlarging the ionic cluster size, this can also lead to a considerable rise in the permeability of the active materials in NAOrFBs. In this study, a series of anion exchange membranes were developed through the introduction of flexible segments into the polymer backbone. Atomic force microscopy analysis confirmed that the developed membranes exhibited similar ionic cluster sizes, while the conductivity increased significantly with the incorporation of flexible monomers. The optimal membrane (QPFEI-0.75) exhibits Cl-conductivity in excess of 30 mS cm-1 at room temperature. Combined with the donnan effect, the permeability of TMAP-TEMPO in QPFEI-0.75 was determined to be 8.56 x 10-11 cm2 s-1, which confirms that the membrane has an excellent conductivity as well as a low permeation rate of the active materials. Upon assembling QPFEI-0.75 into a battery, it was observed that the battery exhibited remarkable stability, undergoing over 1000 complete charge and discharge cycles at 140 mA cm-2 without notable capacity degradation. Moreover, the energy efficiency of the battery remained consistently high at 62 % throughout the entire process. The findings substantiate the potential of the developed membranes in NAOrFBs.

关键词： Neutral aqueous organic redox flow battery Anion exchange membrane diphenyl ether 9-dimethylfluorene Super-acid catalysis

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Cross-section and pore size regulation of hydroxyurea-modified polyacrylonitrile membrane by NH2-CNT and Si(OEt)4 filler and heat treatment for dye removal application at medium temperature

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SEPArATION ANd PUrIFICATION TECHNOLOGY 2023年第1期323卷

作者： Zhou, Luo-lu Fang, Yin-xin Ye, Jing Chen, Meng Yang, Hu Xu, Zhen-liang East China Univ Sci & Technol Chem Engn Res Ctr State Key Lab Chem Engn Membrane Science& Engn R&D Lab 130 Meilong Rd Shanghai 200237 Peoples R China Shanghai Inst Technol Sch Chem & Environm Engn 100 Haiquan Rd Shanghai 201418 Peoples R China

The preparation of ultrafiltration (UF) membranes for dye removal at higher temperature is a challenging task. In this study, hydroxyurea-modified polyacrylonitrile (PAN-Hu) was used to prepare hydrophilic UF membrane. The further addition of NH2-grafted carbon nanotube (CNT) and tetraethoxysilane (TEOS) resulted in a change of the cross-section morphology of the membrane from half-sponge to an asymmetrical one, with an increased pore size due to the hydrophobic nature of the fillers. The resulting PHT/Si membrane showed a higher pure water flux (130 L/m(2) h at 1 bar) than PAN-Hu, with a 98% rejection rate of Congo red (Cr) from a 0.1% NaCl aqueous solution. The dye rejection mechanism was explained based on the molecular size and surface charge density of dyes, as well as force analysis inside the spongy skin layer. Subsequently, two heating methods were adopted to stabilize the structure of membrane, and improve its thermal stability for filtration at medium temperature (60 degrees C). After heating in water at 60 degrees C for 5 days, the rejection rate of Methyl blue (MB) in a 0.1% NaCl solution increased by 80%, but the flux of membrane decreased by more than 50%. On the other hand, heating at 100 degrees C in glycerol for 10 hrs led to a similar increase in dye rejection but a lower decrease in flux. Specifically, the heated PHT/Si membrane showed a dye flux of 64 L/m(2) h, and an MB rejection rate of 94% from water, 80% from a 0.1% NaCl solution at 20 degrees C. Additionally, all membranes showed a higher flux and slightly lower rejection at 60 degrees C compared with that at 20 degrees C. Instrumental characterization revealed that morphology change of membrane was caused by the shrinkage effect through chain rearrangement as a result of heat treatment. But PAN-Hu showed a greater decrease in pore size than PHT/Si membrane. The reason lies in that CNT or SiO2 in PHT/Si membrane acts as physical crosslinking point. Their dimension stabilization effect limits

关键词： Heat treatment dye removal Ultrafiltration Composite membrane Morphology

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Solvent-resistant porous membranes using poly(ether−ether ketone): preparation and application

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Frontiers of Chemical science and engineering 2022年第11期16卷 1536-1559页

作者： Lixin Xing Jiaming Wang Xuehua ruan Gaohong He State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and TechnologySchool of Chemical EngineeringDalian University of TechnologyDalian 116023China School of Chemical Engineering at Panjin Campus Dalian University of TechnologyPanjin 124221China

Poly(ether−ether ketone)(PEEK)is a linear aromatic macromolecule,which can form semi-crystalline aggregative status,allowing PEEK materials to have strong environment tolerance and excellent physicochemical *** materials have become a promising alternative to fabricate particular membranes used in extreme *** the past few decades,many researches and evolutions have emerged in membrane fabrication with PEEK materials and its applications for treating organic solvents and their mixtures;however,there are little systematic and comprehensive literature to summarize fabrication approaches,compile applications,and elaborate PEEK property-structure *** this review,the main approaches to fabricate PEEK-based membranes are illustrated concretely,including conventional thermal-induced and non-solvent-induced phase separation,and novel chemical-induced crystallization;the representative applications in ultrafiltration,nanofiltration and membrane contactor containing organic solvents are demonstrated ***,the mechanism to tune PEEK solubility in solvents,which can be achieved by altering monomers in synthesis processes or changing membrane preparation routes,is deeply ***,the existing problems and the future prospects are also *** review provides positive guidance for designing and fabricating membranes using PEEK and its derivative materials for task-specific applications in harsh conditions.

关键词： PEEK phase inversion solvent-resistant membrane nanofiltration membrane contactor

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Hydrolysis co-deposition of bio-inspired hybrid hydrophilic network antifouling loose nanofiltration membrane for effective dye/salt separation

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JOUrNAL OF membrane science 2024年 694卷

作者： Tong, Yi-Hao Wu, Yu-Zhe Xu, Zhen-Liang Luo, Li -Han Jia, rui Han, rui Xu, Sun-Jie East China Univ Sci & Technol Chem Engn Res Ctr Sch Chem Engn Membrane Science& Engn R&D LabState Key Lab Chem Shanghai 200237 Peoples R China East China Univ Sci & Technol Sch Mat Sci & Engn Shanghai 200237 Peoples R China East China Univ Sci & Technol Shanghai Elect Chem Innovat Inst Shanghai 200237 Peoples R China

Nowadays, loose nanofiltration (LNF) membranes with effective filtration performance toward textile wastewater have drawn intensive attention. In this work, a high-performance LNF membrane was prepared via fast co-deposition of bio-inspired TA-based hydrophilic coating with in-situ hydrolysis of tetra butyl titanate (TBT) on polyethersulfone (PES) substrate. Various additives containing amino acid (l(+)-Arginine) and silane coupling agent (KH792) were mixed in the coating solution and researched their synergistic effects during membrane preparation. In-situ growth of TiO2 and co-deposition of TA-based coating endowed the LNF membrane with a uniformly rough hydrophilic surface. Therefore, the optimal LNF membrane showed a significantly high pure water permeability (92.9 L m(-2) h(-1)ddle dot>bar(-1)) with high rejection (>99.0 %) in treating negatively charged dyes including Eriochrome Black T, Congo red, Chlorazol Black T, and Coomassie Brilliant Blue G. Meanwhile, low rejections for inorganic salts (Na2SO4: 7.9 %, NaCl: 2.5 %, MgCl2: 2.8 %, MgSO4: 7.3 %) were reached, and it kept distinguished separation performance in dealing with highly saline dye wastewater (containing 50 g L-1 NaCl and Na2SO4, respectively). Beyond that, the membrane had excellent antifouling properties with low flux decline of multiple model pollutants and stability during separation dye/salt mixture, which revealed the LNF membrane prepared promising potential in actual textile wastewater treatment.

关键词： Loose nanofiltration membrane Polyethersulfone Bio-inspired coating Tannic acid dye/salt separation

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Proposal and Implementation of a Hand Gesture Control Method for Manipulation of Indoor Wheeled Mobile robot

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Journal of Institute of Control, robotics and Systems 2025年第1期31卷 44-53页

作者： Yun, Seungho Park, Haeun Park, Suyoung Lee, Seongjae Lee, Hui Sung Department of Design Ulsan National Institute of Science and Technology Korea Republic of Department of Creative Design Engineering Ulsan National Institute of Science and Technology Korea Republic of Department of PGM Core Tech R&D Lab LIG Nex1 Korea Republic of Department of Electrical Engineering Ulsan National Institute of Science and Technology Korea Republic of

Mobile robots are widely used and provide convenience to people in places like restaurants and airports. However, there are situations in which their limited autonomy necessitates additional user interaction. While existing studies suggest using hand gestures to manipulate mobile robots, the practical application of such an approach is limited, as they cannot fully address the needs of the user needs and can just primarily be operated in teleoperation environments. In this work, a novel hand gesture operation method has been proposed that can operate a wheeled mobile robot through a manipulation method. In addition to implementing the suggested gesture recognition technique, representative hand gestures were selected by conducting experiments to identify natural gestures based on context for improving usability. A combination of the YOLOv8-based object recognition and pose recognition models was employed to achieve the hand gesture recognition function. Finally, a wheeled mobile robot was also designed to evaluate the hand gesture manipulation system for performing appropriate movements according to the gesture. The overall system was evaluated through experiments and interviews with participants about the workload and usability of the gesture manipulation system. © ICrOS 2025.

关键词： Embedded systems

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