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Dense carbon nanofiber self-supporting electrode fabricated by orientation/compaction strategy for high volumetric lithium storage capacity

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Progress in Natural science:Materials International 2025年第1期35卷 229-237页

作者： Haihui Liu Chaoqun Chen Qiang Xu Yan Song Xiangwu Zhang Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong University CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University

Low bulk density greatly restricts the large-scale application of electrospun carbon-based fiber membrane as electrode in energy storage devices. To solve the above challenges, herein an orientation-compaction densification strategy is proposed to enhance the bulk density and volumetric capacity of PAN-based carbon nanofiber membranes as self-supporting electrode used in lithium-ion batteries（LIBs）. Specifically, highly-oriented fibers are achieved by high-speed roller collecting during electrospinning, and compaction densification is conducted by hot-pressing treatment. The effects of collecting speed and hot-pressing pressure on the morphology, conductivity,bulk density, tensile strength, and flexibility of the obtained carbon nanofiber membrane are *** to conventional fiber membranes, of which fibers are disorderly stacked, the oriented fiber membrane is much easier to achieve dense stacking by compaction. The obtained dense carbon nanofiber membrane demonstrates a bulk density of 0.566 g cm-3, and shows a significantly-enhanced volumetric capacity(318.3 mA h cm-3), high-rate performance(86.6 mA h cm-3at 5 A g-1), and satisfactory cycling stability when used as selfsupporting electrode of LIBs.

关键词： Bulk density Densification Electrospinning Orientation-compaction Volumetric capacity

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Eco-friendly biodegradable foam composite from natural rubber and cassava starch

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polymers from Renewable Resources 2025年第1期16卷 23-38页

作者： Vudjung, Chaiwute Boonyod, Saowaluk Tongkhamwan, Wichan Khawdas, Wichean Phansroy, Nichanan Rubber and Polymer Technology Program Department of Chemistry Faculty of Science Ubon Ratchathani University Warinchamrap Thailand Research Group Department of Chemistry Faculty of Science Ubon Ratchathani University Warinchamrap Thailand Yamagata University Yonezawa Yamagata Jonan Japan Pathumthani Thailand

We thoroughly investigated eco-friendly biodegradable foam from natural rubber (NR) and cassava starch (CS);NR/CS foams. NR, CS, polyethylene glycol (PEG) as a plasticizer, dicumyl peroxide (DCP) as a crosslinker, and azodicarbonamide (ADC) as a blowing agent were compounded in an internal mixer and subsequently cooled down using a two-roll mill. The effect of CS and PEG content on the properties of NR/CS foams was investigated. As evidenced by Mooney viscosity measurement, the viscosity of NR/CS compounds increased with higher CS contents, whereas the viscosity decreased with increasing PEG contents. The rise in viscosity in the NR/CS compounds resulted in increased pore size of NR/CS foams, with pore dimension expanding from 42 to 144 µm as viscosity increased from 17 to 50 ML 1 + 4 at 100°C. The increase in the CS contents in NR/CS foams resulted in an overall decrease in tensile strength, elongation at break, and rebound resilience but provided greater biodegradability. The foam containing 250 phr of CS exhibited a weight retention of only 32% after 1 month of soil burial. On the contrary, with increasing PEG contents, the tensile strength and elongation at break of the NR/CS foams showed an increasing trend. However, rebound resilience and biodegradability decreased. The pore size of the NR/CS foams is a key factor in the water and vegetable oil swelling behavior. The water and vegetable oil swelling increased with an increasing pore size of NR/CS foams. These findings indicated that NR/CS foam has significant potential for various applications, including shockproof and food packaging, while also contributing to the reduction of environmental problems. © The Author(s) 2024.

关键词： Tensile strength

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Fluorinated Functional Units for Li+ Flux Homogenization in Silica Framework-Based Zwitterionic Single Ion Conductors for Stable Lithium Metal Batteries

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Advanced Energy Materials 2025年第0期

作者： Handayani, Puji Lestari Yun, Susung Kim, Gihyeon Choi, U Hyeok Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of

Progress in commercializing solid polymer electrolytes (SPEs) for lithium metal batteries (LMBs) has been impeded by challenges, like concentration polarization, non-uniform Li+ flux, and an unstable solid electrolyte interface (SEI), which contribute to dendrite formation. To address these issues, silica framework (SF)-based single-ion conductors are proposed, featuring a unique solvation channel composed of a fluorinated segment, a high-dipole zwitterion, and a rotation-motion-driven ion-hopping medium. This design promotes low resistance at the cathode/electrode interface, suppresses dendrite growth at the anode/electrolyte interface, and maintains a uniform Li+ flux. This results show that continuous ion channels within a robust framework enhance Li-ion dissociation and transport, achieving high ionic conductivity (σDC = 8.8 × 10−4 S cm−1), a modulus of 0.9 GPa, a high lithium transference number (≈0.83), and an extended electrochemical stability window (up to 5.2 V) at 25 °C. This design fosters the formation of a hybrid organic/inorganic SEI layer composed of Li2CO3, LiF, and Li2O, enabling ultra-stable Li plating/stripping for over 4000 h at 0.1 mA cm−2. Furthermore, the full cells demonstrate excellent rate performance and long-term cycling stability and capacity retention (81% for Li||LFP and 86% for Li||NCM811 after 400 cycles at 1 C) and high coulombic efficiency, offering a promising strategy to stable LMBs. © 2025 Wiley-VCH GmbH.

关键词： Solid electrolytes

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Ion-Anchoring Dipole-Integrated Composite Elastomer Electrolyte and Cathode for High-Performance Lithium Metal Batteries via Multiple-Bridge Engineering

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Advanced Energy Materials 2025年第0期

作者： Cho, A Hyeon Je, Ji Hyang Choi, U Hyeok Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of

Solid-state electrolytes (SSEs) hold significant potential for advancing lithium metal batteries (LMBs) by enhancing safety through the replacement of liquid electrolytes. However, challenges such as low ionic conductivity, limited electrochemical stability, and poor electrolyte/electrode interface compatibility hinder the development of high-energy-density LMBs. Herein, a strategy for designing SSEs is proposed using multiple-bridge engineered composite elastomer electrolytes (CEEs) that incorporate ion-rotating dipole interactions, ion-anchoring dipole interactions, and hydrogen bonding, along with a CEE-based composite elastomer cathode (CEC). This design combines a volume-adaptive elastomer matrix, a high-Li+ conducting deep eutectic electrolyte, and robust nanowires. The resultant CEE exhibits high ionic conductivity (1.7 × 10−3 S cm−1), a lithium transference number of 0.72, and a wide electrochemical stability window (up to 4.9 V) at 298 K. The engineered uniform Li+ flux also promotes stable Li plating/stripping for over 900 h at 0.1 mA cm−2. Furthermore, the LFP-based CEC|CEE|Li full cells deliver a reversible capacity of 133 mAh g−1 with 95% retention after 300 cycles in coin cells, and 129 mAh g−1 with 96% retention after 250 cycles in pouch cells at 1 C. This strategy presents a promising approach for designing solid-state polymer electrolytes to extend the lifespan of high-energy-density LMBs. © 2025 Wiley-VCH GmbH.

关键词： Elastomers

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Current advances of biodegradable and biocompatible nanofiber-based materials for tissue engineering and drug delivery

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MRS Communications 2025年 1-17页

作者： Li, Zhiming Bhaskar, Nitu Erel-Akbaba, Gulsah Zhu, Yuhui Ge, Gang Park, Jinyoung Angadi, Kishan Duhoon, Achal Nguyen, Thanh Duc Department of Biomedical Engineering University of Connecticut Storrs USA Polymer Program Institute of Materials Science University of Connecticut Storrs USA Department of Pharmaceutical Biotechnology Faculty of Pharmacy Izmir Katip Celebi University Izmir Turkey Department of Mechanical Engineering University of Connecticut Storrs USA

Nanoscale fibrous materials of natural and synthetic polymers with high porosity, flexibility, biodegradability, biocompatibility, and functionality have garnered a lot of scientific attention and present exciting opportunities for regenerative medicine and drug delivery. The potential of developing scaffolds and drug delivery systems that can overcome current barriers in the fields of medicine and pharmacy is greatly expanded by the transformation and incorporation of nanofibers into free-standing nanomembranes, 3D scaffolds, actuators, transducers or sensors, which permits localized stimulation of target tissues, promotes proliferation, and enables controlled drug release over time. This review emphasizes innovative materials, fabrication techniques, and biomedical uses of synthetic and natural nanofiber-based biomaterials. Different from the previous reviews in the field, this work at best includes literature within the last 8 years to cover new exciting functional nanofibers (such as biodegradable electroactive nanofibers) and unique medical applications of these nanofiber materials. We highlight the use of a range of recent fabrication techniques (electrospinning, phase separation, and molecular self-assembly) to enhance the physicochemical and mechanical properties as well as (bio)compatibility of nanofibers for advanced drug delivery systems and tissue engineering applications. At the end, this article provides a future perspective on the advancement of biodegradable and biocompatible nanofibers for the fields of tissue engineering and drug delivery.

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Graphene-functionalized textile composites for wearable Joule heating applications

Advanced Nanocomposites

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Advanced Nanocomposites 2025年 2卷 108-123页

作者： Omar Faruk Abbas Ahmed Ashfaqul Hoque Khadem Lu Jia Luyi Sun Department of Materials Science and Engineering Binghamton University State University of New York at Binghamton NY 13902 USA Polymer Program Institute of Materials Science and Department of Chemical & Biomolecular Engineering University of Connecticut Storrs CT 06269 USA Department Mechanical Engineering College of Engineering Computing and Applied Science Clemson University Clemson SC 29634 USA College of Textile Engineering Taiyuan University of Technology Jinzhong Shanxi 030600 China

Thermal comfort is essential for maintaining physiological well-being, with textile materials traditionally serving as the primary medium for regulating heat exchange between the body and its environment. However, conventional textiles often fall short of maintaining optimal thermal balance. So, there is an increasing demand for advanced thermoregulation systems that can effectively reduce heat loss and enhance warmth, ensuring consistent comfort. Recent research has highlighted the promise of advanced functional materials, especially graphene and its composites, for modifying textiles to improve thermal properties. This article comprehensively reviews recent advancements in graphene-functionalized textile composites, focusing on their applications in wearable Joule heaters designed for personalized thermal comfort or thermal therapy. Various graphene-functionalized textile composites are reviewed from the perspectives of material properties, processing strategies and device fabrication methods. Key challenges and future opportunities are summarized for graphene-functionalized textile-based Joule heaters as innovative solutions in wearable thermal regulation.

关键词： Graphene Textile Composite Wearable electronics Joule heater

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A combined experimental and computational study of electron transfer in the light harvesting perylenediimide-poly(p-phenylene) supramolecular dyad

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Journal of Molecular Liquids 2025年 427卷

作者： El-Khouly, Mohamed E. Kobaisy, Ahmed M. Yildirim, Erol El-Shafei, Ahmed New Borg El-Arab City Alexandria Egypt Fiber and Polymer Science Program North Carolina State University RaleighNC27606 United States Department of Chemistry Middle East Technical University Ankara06800 Turkey Department of Chemical Physics Lund University Box 124 Lund22100 Sweden

A novel supramolecular dyad, composed of the electron-accepting N,N’-di(2-(trimethylammoniumiodide) ethylene) perylenediimide (TAIPDI) and the electron donating electron-donating poly[2,5-bis(3-sulfonatopropoxy)-1,4-phenylenealt-1,4-phenylene] sodium salt (PPPOPSO3), was constructed through ionic and electrostatic interactions. Photophysical studies, including steady-state absorption and fluorescence spectroscopy, revealed a moderate binding constant (∼ 104 M−1) and significant fluorescence quenching of TAIPDI upon complexation with PPPOPSO3. These results indicate efficient electron transfer from the excited state of TAIPDI to PPPOPSO3 within the dyad. Time-resolved fluorescence measurements revealed a rapid (3.88 × 109 s−1) and efficient (0.95) electron transfer in the self-assembled PPPOPSO3-TAIPDI dyad in aqueous medium. Similar electron transfer was observed in methanol with a rate constant (6.29 × 109 s−1) and efficiency (0.97). DFT calculations corroborated the structure, stability, and charge distribution of the dyad. This system's simplicity, broad absorption, and efficient electron transfer make it promising for light-harvesting applications. © 2025 Elsevier B.V.

关键词： Density functional theory

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KINETIC-STUDY OF THE AQUEOUS ELECTROpolymerIZATION OF ACRYLAMIDE, ACRYLONITRILE AND N,N'-METHYLENEBISACRYLAMIDE ON AN ALUMINUM-ALLOY CATHODE

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JOURNAL OF MATERIALS science 1995年第15期30卷 3827-3833页

作者： LEE, CS BELL, JP Polymer Science Program Institute of Materials Science University of Connecticut Storrs USA

This study concerns the potassium persulphate electroinitiated polymerization of acrylamide, acrylonitrile and N, N'-methylene-bisacrylamide on a 5182 aluminium-magnesium alloy. Kinetic studies of the polymerization gave the polymerization as - d[M]/dt = K (CD)(0.99) [persulphate](1.12) [M](2.33), where CD is current density (mA cm(-2)), [M] is monomer concentration (mol cm(-3)), K is a constant and t is time (s). It is proposed that the thick swollen polymer coating restricted the diffusion of monomers and initiators to the electrode. The problem of mass transfer by diffusion in the present system was confirmed by measurements of the diffusion coefficient and by electron transfer fraction experiments carried out through the use of a cyclic voltammetry technique.

关键词： Aluminum alloys

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A COMPARISON OF THE PROPERTIES OF CERIC ION AND PREIRRADIATED ACRYLIC-ACID GRAFTS TO RAYON FIBERS

POLYMER JOURNAL

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polymer JOURNAL 1987年第5期19卷 643-648页

作者： MCDOWALL, DJ GUPTA, BS STANNETT, VT Fiber and Polymer Science Program North Carolina State University

Acrylic acid has been grafted to rayon filaments using both the high energy radiation and ceric ion methods. By using preirradiation and a pretreatment of the cellulose with the ceric salt, homopolymer was reduced to acceptable amounts. A number of properties have been measured on the treated controls without monomer and on the grafted samples. These included tenacities, elongations, initial modulii and work to rupture. The moisture regains and water retention values were also determined. Considering the tensile properties, the pretreatments resulted in a drop in the values except for the initial modulii. Ceric ion initiation produced more degradation than the preirradiation treatment. This was attributed to the additional acidic and oxidative effects in the case of the former method. Grafting with both methods of initiation led to an initial improvement of properties over the treated control values. As the degree of grafting increased, however, the values decreased. In all cases ceric ion gave somewhat lower properties compared with preirradiation. The moisture regains and water retention values showed some rather minor differences between the two types of grafting. Explanations of the various behavior patterns are presented.

关键词： Ceric-Ion Preirradiation Grafting Cellulose Acrylic Acid Properties Sorbency Tensiles

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ELECTRO-COpolymerIZATION OF ACRYLONITRILE AND METHYL ACRYLATE ONTO GRAPHITE FIBERS

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JOURNAL OF APPLIED polymer science 1987年第6期34卷 2105-2124页

作者： CHANG, J BELL, JP SHKOLNIK, S Polymer Science Program University of Connecticut Storrs Connecticut 06268

Electro‐copolymerization of methyl acrylate, acrylic acid, methacrylic acid, acrylamide, and methyl methacrylate with acrylonitrile onto graphite fibers has been successfully done in our laboratory. The coatings are relatively uniform and their properties, especially their modulus, can be systematically varied by controlling the monomer ratio in the eletrolyte solution. This technique is being used to introduce a ductile interlayer of contrlled composition and thickness between the composite fibers and matrix. Copolymers of methyl acrylate and acrylonitrile formed by this technique are random copolymers, with T g ′s varying from 10 to 90°C. These copolymers have fairly high molecular weight, in the range of 100,000 g/mol. Monomer reactivity ratios were determined, based upon free radical polymerization kinetics, from cyclic voltammetry. An indirect initiation mechanism is suggested. Bonding between interlayer and matrix can be improved by introducing vinyl monomers with proper functional groups, capable of reacting with the epoxy resin, at the last stage of the electropolymerization process.

关键词： ACRYLICS

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