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ensile and structural properties of natural rubber vulcanizates with different mastication times

Polimeros 2021年第1期31卷

作者： Hayeemasae, Nabil Soontaranon, Siriwat Rasidi, Mohamad Syahmie Mohamad Masa, Abdulhakim Department of Rubber Technology and Polymer Science Faculty of Science and Technology Prince of Songkla University Pattani Thailand Research Unit of Advanced Elastomeric Materials and Innovations for BCG Economy Faculty of Science and Technology Prince of Songkla University Pattani Thailand Synchrotron Light Research Institute Nakhon Ratchasima Thailand Faculty of Chemical Engineering Technology Universiti Malaysia Perlis Perlis Malaysia Perlis Malaysia Rubber Engineering and Technology Program International College Prince of Songkla University Hat Yai Songkhla Thailand

Mastication reduced the molecular weight of natural rubber (NR). This would affect the tensile properties and straininduced crystallization of the rubber vulcanizates due to the structural changes of the rubber molecules. In this study, influences of mastication time on tensile response, deformation-induced crystallization, and structural effects of crosslinked NR were investigated. The crystallization behavior and structural changes during stretching were studied by means of wide angle X-ray scattering (WAXS) and small angle X-ray scattering (SAXS). Increased mastication time significantly affected modulus at specified strain and upturn point of strain-induced crystallization of the crosslinked samples while the tensile strength was influenced slightly by mastication. During stretching, degree of crystallinity at given strain was found to decrease with increasing mastication time, while the crystallite size was reduced. Moreover, the size of crosslinked network structures induced by crosslinking also decreased slightly with increasing mastication time, as suggested by SAXS measurement. © 2021 Associacao Brasileira de Polimeros. All rights reserved.

关键词： Rubber

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Bacteria-based bioactive materials for tumor immunotherapy

Precision Medicine and Engineering

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Precision Medicine and engineering 2024年第2期1卷

作者： Yongcan Li Fangfang Cao Lie Ma Lulu Jin MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 PR China Departments of Diagnostic Radiology Surgery Chemical and Biomolecular Engineering and Biomedical Engineering Yong Loo Lin School of Medicine and College of Design and Engineering National University of Singapore 119074 Singapore Nanomedicine Translational Research Program NUS Center for Nanomedicine Yong Loo Lin School of Medicine National University of Singapore 117597 Singapore

As one of the most abundant biological populations endowed with unique properties such as specific targeting and genetic engineering vectors, bacteria with immunogenic potential have garnered significant attention for their ability to elicit immune activation against tumors. This approach has achieved substantial breakthroughs as a modality for cancer treatment and is known as bacterial immunotherapy. However, the immunosuppressive tumor microenvironment (TME) can inhibit the immune response induced by bacteria and promote tumor growth and metastasis. To overcome this challenge, recent advancements in bacteria-based bioactive materials, which are biological substances synthesized by bacteria, have not only harnessed the inherent properties of bacteria but also specifically targeted the modulation of the TME, providing a more favorable environment for immune activation and significantly enhancing the efficacy of immunotherapy for cancer treatment. This review introduces the key mechanisms of bacteria-based biomaterials as anticancer agents and reviews the latest research progress, along with their clinical applications in cancer treatment. Finally, the potential and challenges of bacteria-based biomaterials for tumor therapy are explored, aiming to provide insights into the functions of bacteria-based bioactive materials and their role in advancing cancer immunotherapy while offering recommendations for the development of new bacteria-based biomaterials.

关键词： Tumor immunotherapy Immune cells Tumor microenvironment Bioactive materials

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Correction: N-doped carbon nanoparticles on highly porous carbon nanofiber electrodes for sodium ion batteries

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RSC advances 2025年第8期15卷 6370页

作者： Meltem Yanilmaz Bülin Atıcı Jiadeng Zhu Ozan Toprakci Juran Kim Nano-Science and Nano-Engineering Program Graduate School of Science Engineering and Technology Istanbul Technical University Istanbul 34469 Turkey yanilmaz@itu.edu.tr. Textile Engineering Istanbul Technical University Istanbul 34469 Turkey. Smart Devices Brewer Science Inc. Springfield MO 65806 USA. Department of Polymer Materials Engineering Yalova University 77200 Yalova Turkey. Advanced Textile R&D Department Korea Institute of Industrial Technology (KITECH) Ansan 15588 Korea jkim0106@kitech.re.kr.

[This corrects the article DOI: 10.1039/D3RA00635B.].

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A drone-based rotating cascade impactor for single-particle analysis: Advancing aerosol mixing state research

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Atmospheric Research 2025年 325卷

作者： Lee, Songhui Baek, Minwoo Kim, Miri Park, Jaebeom Yoo, Minsang Kwon, Yongbum Ahn, Kang-Ho Lee, Handol Program in Environmental and Polymer Engineering of Inha University 100 Inha-ro Michuhol-gu Incheon 22212 South Korea Department of Environmental Engineering Inha University 100 Inha-ro Michuhol-gu Incheon 22212 South Korea Korea National Institute of Rare Metals Korea Institute of Industrial Technology Namdong-gu Incheon 21655 South Korea Department of Mechanical Engineering Hanyang University 55 Hanyangdaehak-ro Sangnok-gu Ansan 15588 South Korea Particle Pollution Research and Management Center Inha University Incheon 21999 South Korea

A novel drone-based aerosol sampling system, integrated with a rotating cascade impactor, was developed to enable size-selective sampling of atmospheric particles at upper altitudes. The system features rotating impaction stages that enable particle deposition suitable for single-particle analysis. For the first time, this platform was combined with Raman microspectroscopy (RMS) and surface-enhanced Raman spectroscopy (SERS) to perform detailed physicochemical characterization of airborne particles, including submicron aerosols, across ground level and aloft. Applied during a high-pollution event, the methodology enabled the characterization of particle mixing states, chemical functional groups, and size-dependent features that may be associated with aerosol transformation mechanisms. Single-particle analysis showed that internally mixed particles in the coarse-mode size range (1.35–5.5 μm) accounted for 53 % of the total in the upper-level sample, exceeding single-component particles by 20 %, which suggests multiphase processing and aging. Among sulfate-containing coarse particles, CaSO₄ was the dominant species (38 %), indicating secondary formation through heterogeneous reactions during long-range transport In the submicron range (<1 μm), nitrate particles dominated (77 %), attributed to freshly formed aerosols resulting from coastal air masses with limited aging. These results highlight the significance of integrating high-resolution vertical aerosol profiling into atmospheric observations, revealing differences not captured by ground-based measurements. Beyond the field findings, this study also demonstrates the utility of a lightweight, drone-mounted rotating cascade impactor system, which enables scalable, size-selective, and altitude-resolved single-particle sampling under atmospheric conditions. This integrated approach offers a novel and practical framework for advancing both aerosol instrumentation and our understanding of atmospheric particle

关键词： Atmospheric particle Mixing state Quadcopter drone Raman microspectroscopy Rotating cascade impactor Surface-enhanced Raman spectroscopy

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Laser-assisted synthesis of metakaolin/Pd nanocomposite and its application as catalyst in wastewater remediation

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Nano-Structures and Nano-Objects 2025年 42卷

作者： Jaleh, Babak Sahraei, Ahmadreza Eslamipanah, Mahtab Seifikar, Fatemeh Azizian, Saeid Jalali, Sara Enghardt, Stefan Kruppke, Benjamin Khonakdar, Hossein Ali Gawande, Manoj B. Department of Physics Faculty of Science Bu-Ali Sina University Hamedan Iran Department of Physical Chemistry Faculty of Chemistry and Petroleum Sciences Bu-Ali Sina University Hamedan Iran Chair of Biomaterials Institute of Materials Science Technische Universität Dresden Max-Bergmann-Zentrum für Biomaterialien Budapester Str. 27 Dresden 01069 Germany Chair of Materials Technology Institute of Materials Science Technische Universität Dresden Dresden 01062 Germany Max Bergmann Center of Biomaterials Institute of Materials Science Technische Universität Dresden Dresden 01069 Germany Department of Processing Iran Polymer and Petrochemical Institute Tehran Iran Department of Industrial and Engineering Chemistry Institute of Chemical Technology Mumbai-Marathwada Campus Maharashtra Jalna 431203 India Centre for Energy and Environmental Technologies (CEET) Nanotechnology Centre VSB–Technical University of Ostrava 17. listopadu 2172/15 Ostrava-Poruba 708 00 Czech Republic

Developing industrial activity and changing climate worldwide increase water contaminants and reduce safe water resources. Therefore, wastewater treatment and the removal or reduction of water contaminants have become important challenges. Affordable nanocatalysts for wastewater treatment are an effective solution to overcome this problem. Fabrication of a new type of metakaolin/Pd nanocomposite (MK/Pd) facilitates the reduction of noxious methyl orange and Cr(VI). This nanocomposite was manufactured based on the deposition of Pd NPs on the MK. In this study, the MK was first synthesized through a one-step heat treatment process at -750 °C for 4 h. Meanwhile, the laser ablation of Pd target in deionized water was also applied as a fast and chemical-free technique to prepare colloidal Pd nanoparticles (NPs). The samples were analyzed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and BET analysis. The structural investigations indicated that MK surfaces with rough platy morphology were decorated with Pd NPs with an average crystallite size of 42 nm. The catalytic performance of the MK/Pd was also investigated for the reduction of methyl orange (MO) and Cr(VI) in an aqueous medium employing sodium borohydride or formic acid. The progress of reactions was monitored using UV–Vis spectroscopy, suggesting that the as-fabricated nanocomposite delivers very rapid reduction of both Cr(VI) (45 s) and MO (400 s). Compared to MO, Cr(VI) reduced ten times faster. © 2025 Elsevier B.V.

关键词： Cr(VI) Kaolin Laser ablation Methyl orange Palladium nanoparticles

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Fabrication of PDMS-Stabilized porous silver films derived from recovered silver sources as flexible conductive materials

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Journal of Industrial and engineering Chemistry 2025年

作者： Natsuda Muankhajorn Sanong Ekgasit Akira Baba Wisansaya Jaikeandee Porapak Suriya Taveesak Janduang Kanet Wongravee Sensor Research Unit (SRU) Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand Program in Petrochemistry and Polymer Science Faculty of Science Chulalongkorn University Pathumwan Bangkok 10330 Thailand Graduate School of Science and Technology and Faculty of Engineering Niigata University 8050 Ikarashi 2-nocho Nishi-ku Niigata 950-2181 Japan Public Administration Faculty of Science Chulalongkorn University Pathumwan Bangkok 10330 Thailand

This study presents a straightforward and efficient approach for the fabricating flexible conductive materials by integrating porous silver films onto a PDMS substrate. The process involves oxidative acetoxylation of silver into silver acetate (AcOAg) using ethyl acetate, followed by thermal decomposition to generate a porous silver structure on the PDMS suitable for flexible electronics. The impact of different silver sources including pure silver beads and recovered silver microstructures (irregular sphere and plate-like shape from spent button batteries) on acetoxylation process was investigated. Regardless of the initial silver morphology, rod-shaped silver acetate (RS-AcOAg) formed consistently, demonstrating the silver acetoxylation reaction independence from the silver source. Upon thermal decomposition, RS-AcOAg transformed into porous silver films, but uncontrolled sintering resulted in rigid structures that degraded electrical properties. To improve conductive activities, the introduction of PDMS as a surface stabilizing agent effectively suppressed sintering, preserving porous structure. Electrical characterization revealed that non-PDMS-coated silver strips exhibited high relative resistance change (Δ R / R 0 ) values with irreversible behavior due to internal cracking, whereas PDMS-coated porous silver films demonstrate lower Δ R/R 0 values with excellent reversibility under mechanical strain (stretching and bending). These findings confirm that PDMS-stabilized porous silver films offer a promising route for flexible conductive materials, with enhanced structural integrity and mechanical durability.

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Superb Adsorption of Congo Red by Zn-Cr Layered Bimetallic Hydroxides Prepared from Electroplated Sludge

SSRN

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SSRN 2022年

作者： Kong, Dehui Xie, Wenyu Wu, Jinxiong Yan, Xiuling Ivanets, Andrei Zhang, Lijuan Chu, Sha Sha Yang, Bo Davronbek, Bekchanov Su, Xintai Key Laboratory of Pollutant Chemistry and Environmental Treatment School of Chemistry and Environmental Science Yili Normal University Yining835000 China Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control School of Environmental Science and Engineering Guangdong University of Petrochemical Technology Guangdong Maoming525000 China South China University of Technology Guangdong Guangzhou510006 China Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling Guangdong510006 China Institute of General and Inorganic Chemistry The National Academy of Sciences of Belarus Surganova St. 9/1 Minsk220072 Belarus Department of Polymer Chemistry National University of Uzbekistan Tashkent100174 Uzbekistan

How to realize the harmless treatment and resource utilization of various metal elements in electroplating sludge is a challenge, and transforming it into functional materials has become an important technical direction. In this study, based on the existence of various metal ions in electroplating sludge, a sodium oleate intercalated Zn-Cr-LDHs was prepared by two-phase solvothermal method. Under the optimal conditions, the maximum adsorption capacity of Zn-Cr-LDHs for Congo red (CR) in aqueous solution was 2750.43 mg/g, which was much higher than that of most adsorbents. The adsorption process of Zn-Cr-LDHs can be described by Langmuir isotherm model and pseudo-second-order kinetic model, and the KL value is 0.017, and the correlation coefficient is R2 = 0.996. The Results of TEM and XPS suggested that the adsorption mechanism was mainly the adsorption process of CR intercalated Zn-Cr-LDHs assisted by sodium oleate molecule, and also included surface complexation, ion exchange and hydrogen bonding. Therefore, the strategy of recovering metal elements from the electroplating sludge to prepare the LDHs adsorption material is provided, and the obtained Zn-Cr-LDHs has ultrahigh organic matter adsorption capacity which cannot be obtained by common adsorbents, and has good application prospect in the field of treating organic wastewater pollution. © 2022, The Authors. All rights reserved.

关键词： Adsorption

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Photocatalytic Hydroxylation and Oxidative Coupling Reactions Mediated by Multinuclear Au(I) Supramolecular Clusters

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Angewandte Chemie 2024年第8期137卷

作者： Qing-Ya Sun Hui-Zhen He Ying Zhou Yu-Peng Dai Ping Shang Dr. Xuan-Feng Jiang Key Laboratory of Green Preparation and Application for Functional Materials Ministry of Education Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry Hubei Key Laboratory of Polymer Science School of Materials Science and Engineering Hubei University Wuhan Hubei 430062 P. R. China Department of Chemistry and Environmental Engineering Hubei Minzu University Enshi Hubei 445000 P. R. China

Polynuclear Au(I) cluster photocatalysts, known for their high activity and stability, hold substantial potential in organic synthetic chemistry. This study synthesized two Au(I) supramolecular cluster catalysts with different nuclearities: a tetranuclear cluster, C1 ([(dppmAu 2 ) 2 L 1 ] • PF 6 − ), and a hexadecanuclear cluster, C2 [(dppmAu 2 ) 6 (Au 4 )( L 1 ) 4 ] • 4PF 6 − , through a multicomponent stepwise self-assembly approach. Both cluster structures feature aurophilicity interaction motifs that endow them with exceptional photocatalytic performance, exhibiting optical band gaps of 2.27 eV and 2.41 eV, respectively. Upon photoexcitation, these clusters efficiently generate reactive oxygen species, significantly enhancing their photocatalytic efficacy for the oxidative hydroxylation of phenylboronic acids and oxidative coupling of benzylamines under mild conditions. Catalytic efficiencies exceeding 90 % were achieved. Turnover frequencies for C2 and C1 were measured at 52.045 h −1 and 6.030 h −1 , respectively, representing the highest efficiencies reported for photocatalysts to date. Compared to C1 , C2 exhibited superior photocatalytic activity, attributed to its higher photoelectric sensitivity and greater exposure of active metal sites. Using a combination of experimental data and density functional theory calculations, the plausible mechanisms were proposed for two photocatalytic reactions. This study demonstrates that the use of multicomponent cooperative self-assembly strategy to synthesize high-nuclearity Au(I) clusters offers innovative pathways for the development of efficient, green, light-driven organic synthesis.

关键词： Au(I) complex Photocatalysis Cluster catalysts Multiple active sites

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Inhibition of sulfate-reducing bacteria influenced corrosion on hydrophobic poly(dimethylsiloxane)coatings

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Journal of Materials science & Technology 2020年第17期52卷 198-206页

作者： Innocent O.Arukalam C.N.Njoku Lihui Yang Baorong Hou Ying Li Corrosion and Protection Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Department of Polymer and Textile Engineering Federal University of TechnologyP.M.B.1526 Owerri Nigeria Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Advanced Functional Materials/Corrosion Research Group Africa Centre of Excellence in Future Energies and Electrochemical Systems(ACE-FUELS)Federal University of Technology Owerri(FUTO)Nigeria

Sulfate-reducing bacteria(SRB)has been pointed out as one of the causative agents of microbial induced corrosion in the marine *** address this problem,novel strategies are being experimented as against the earlier methods which have been banned due to their toxic effects on useful aquatic ***,the aim of this study was to investigate the effect of non-toxic perfluorodecyltrichlorosilane(PFDTS)on resistance of hydrophobic poly(dimethylsiloxane)/phosphoric acid-treated zinc oxide(PDMS/PA-treated ZnO)coatings to SRB-induced biofouling and *** surface features of the coatings before and after exposure to SRB/NaCl solution were analyzed by scanning electron microscopy(SEM).Wettability of the coatings before and after exposure was also *** interaction of SRB with the coatings was investigated by FTIR *** resistance performance of the modified coatings against SRB-induced corrosion was monitored by electrochemical impedance spectroscopy(EIS).The EIS measurements revealed that 0.20 g PFDTS-based coating displayed highest corrosion resistance with impedance modulus of 6.301×10^10 after 15 d of exposure to SRB/NaCl *** results were corroborated by surface and chemical interaction analyses,and thus,indicate that 0.20 g PFDTSmodified PDMS/PA-treated ZnO coating has potentials for excellent SRB-induced corrosion resistance and anti-biofouling performance.

关键词： Corrosion Hydrophobic coating Perfluorodecyltrichlorosilane Poly(dimethylsiloxane) Sulfate-reducing bacteria

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Author Correction: Ordered π-conjugated polymer backbone in amorphous blend for high efficiency nonfullerene organic photovoltaics

Communications Materials

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Communications Materials 2023年第1期4卷 1页

作者： Masahiko Saito Tsubasa Mikie Itaru Osaka Hiroya Yamada Jihun Jeon Hyung Do Kim Hideo Ohkita Kakaraparthi Kranthiraja Akinori Saeki Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8527 Japan Department of Polymer Chemistry Graduate School of Engineering Kyoto University Katsura Nishikyo-ku Kyoto 615-8510 Japan Department of Applied Chemistry Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan

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