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Fabrication of versatile poly(xylitol sebacate)-co-poly(ethylene glycol) hydrogels through multifunctional crosslinkers and dynamic bonds for wound healing

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Acta Biomaterialia 2023年 170卷 344-359页

作者： Yeh, Ying-Yu Lin, Yi-Yun Wang, Ting-Teng Yeh, Yu-Jia Chiu, Ting-Hsiang Wang, Reuben Bai, Meng-Yi Yeh, Yi-Cheun Institute of Polymer Science and Engineering National Taiwan University Taipei Taiwan Institute of Biomedical Engineering National Taiwan University Taipei Taiwan Biomedical Engineering Program Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei Taiwan Institute of Food Safety and Health National Taiwan University Taipei Taiwan Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology Taipei Taiwan Adjunct Appointment to the Department of Biomedical Engineering National Defense Medical Center Taipei Taiwan Program National Taiwan University Taipei Taiwan GIP-TRIAD Master's Degree in Agro-Biomedical Science National Taiwan University Taipei Taiwan

Poly(polyol sebacate) (PPS) polymer family has been recognized as promising biomaterials for biomedical applications with their characteristics of easy production, elasticity, biodegradation, and cytocompatibility. Poly(xylitol sebacate)-co-poly(ethylene glycol) (PXS-co-PEG) has been developed to fabricate PPS-based hydrogels;however, current PXS-co-PEG hydrogels presented limited properties and functions due to the limitations of the crosslinkers and crosslinking chemistry used in the hydrogel formation. Here, we fabricate a new type of PXS-co-PEG hydrogels through the use of multifunctional crosslinkers as well as dynamic bonds. In our design, polyethyleneimine-polydopamine (PEI-PDA) macromers are utilized to crosslink aldehyde-functionalized PXS-co-PEG (APP) through imine bonds and hydrogen bonds. PEI-PDA/APP hydrogels present multiple functional properties (e.g., fluorescent, elastomeric, biodegradable, self-healing, bioadhesive, antioxidant, and antibacterial behaviors). These properties of PEI-PDA/APP hydrogels can be fine-tuned by changing the PDA grafting degrees in the PEI-PDA crosslinkers. Most importantly, PEI-PDA/APP hydrogels are considered promising wound dressings to promote tissue remodeling and prevent bacterial infection in vivo. Taken together, PEI-PDA/APP hydrogels have been demonstrated as versatile biomaterials to provide multiple tailorable properties and desirable functions to expand the utility of PPS-based hydrogels for advanced biomedical applications. Statement of significance: Various strategies have been developed to fabricate poly(polyol sebacate) (PPS)-based hydrogels. However, current PPS-based hydrogels present limited properties and functions due to the limitations of the crosslinkers and crosslinking chemistry used in the hydrogel formation. This work describes that co-engineering crosslinkers and interfacial crosslinking is a promising approach to synthesizing a new type of poly(xylitol sebacate)-co-poly(ethylene glycol) (PXS-co-

关键词： Polyols

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Characterization of False Banana Fiber as a Potential Reinforcement Material for Geopolymer Composites 10th

Characterization of False Banana Fiber as a Potential Reinfo...

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10th EAI International Conference on Advancements of science and Technology , EAI ICAST 2022

作者： Addis, Lulseged Belay Sendekie, Zenamarkos Bantie Habtu, Nigus Gabbiye Schubert, Dirk W. Roether, Judith A. Boccaccini, Aldo R. Faculty of Chemical and Food Engineering Bahir Dar Institute of Technology Bahir Dar University Bahir Dar Ethiopia Department of Mechanical Engineering Kombolcha Institute of Technology Wollo University Kombolcha Ethiopia Institute of Biomaterials Department of Materials Science and Engineering University of Erlangen-Nuremberg Erlangen Germany Institute of Polymer Materials Department of Materials Science and Engineering University of Erlangen-Nuremberg Erlangen Germany

ISBN: (纸本)9783031336096

There is renewed interest in the use of plant-derived fibers as reinforcement material in the manufacture of composites. Replacing synthetic fiber with natural fiber has several benefits. Availability, biodegradability, lightweight, reduction of carbon footprint, and less abrasiveness in tool wear during processing are among the common benefits over synthetic fiber counterparts. The objective of this study is to investigate the physical, mechanical, thermal, and chemical properties of false banana fiber, obtained from false banana plants. The results show that the fiber has a relatively low moisture content, demonstrating that the false banana fiber has good physical properties as the moisture content of the fiber determines the dimensional stability of the produced composites. The mean diameter and true density of the fiber were found to be 173 μm and 1.483 g/cm3, respectively. A single fiber tensile test was carried out to determine the mechanical strength of the fiber. Its strength varied between 125 and 784 MPa. Based on the thermal stability test, the initial degradation of the fiber starts at 263 °C while its maximum degradation is observed at 364 °C. From the results of the chemical analysis, the fiber contains about 58.16% cellulose, 23.64% hemicellulose, and 11.12% lignin as the main components, and a small amount of extractives and ash, 4.04%, and 3.03%, respectively. Based on the overall analysis of the test results, the false banana fiber can be confirmed as one of the potential reinforcement source materials that can be used for the production of polymer composites for various applications. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Moisture

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Steering S-scheme charge transfer via interfacial dipoles induced by amine-containing polyelectrolytes

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science China Chemistry 2023年第7期66卷 2098-2108页

作者： Tao Li Chuang Feng Biquan Xiong Xuhui Zhu Zhicai He Wai-Yeung Wong Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSchool of Material Science and EngineeringSouth China University of TechnologyGuangzhou 510640China Department of Applied Biology&Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomHong KongChina

The lack of a robust interfacial driving source over multicomponent photocatalysts is an essential contributor to the sluggish spatial charge transfer across the heterointerface and severe carrier recombination,thereby rendering maneuvering charge transfer of composite materials a thorny ***,we demonstrate an electric dipole moment-driven charge transfer photosystem utilizing amine-containing polyfluorene polyelectrolyte(i.e.,PFN)and inorganic semiconductor matrices(i.e.,WO_(3))as the building blocks to direct the interfacial charge transfer,effectively targeting the photoexcited charge carriers to the active *** results and theoretical simulations reveal that the electronic coupling interaction between the pendant electron-rich amine groups along the PFN backbone and WO_(3)surface enables the nonuniform charge distribution at the interface over the WO_(3)@PFN heterojunction,which ultimately fosters the formation of interfacial dipoles oriented from conjugated macromolecular backbone of PFN to the surface of WO_(3)*** interfacial dipoles with excellent charge transfer kinetics spontaneously activate the unidirectional and accelerated S-scheme charge motion from the WO_(3)framework to the conjugated chain of PFN due to the suitable band offsets at the interface,thus endowing WO_(3)@PFN heterostructures with a significantly enhanced net efficiency of *** findings would provide some insights into the design of advanced heterojunction photocatalysts for solar energy conversion as well as the study of the working mechanism of polyelectrolyte interlayers in optoelectronic devices.

关键词： photocatalysis heterojunction interfacial dipole polyelectrolyte S-scheme

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Effect of physical and biological pretreatment on sugarcane bagasse waste-based biogas production

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Materials Today: Proceedings 2023年 87卷 41-44页

作者： Sumardiono S. Matin H.H.A. Sulistianingtias I. Nugroho T.Y. Budiyono B. Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang 50239 Indonesia Study Program of Environmental Science Faculty of Mathematic and Natural Science Universitas Sebelas Maret Surakarta 57126 Indonesia Vocational School Universitas Diponegoro Semarang 50239 Indonesia

Sugarcane bagasse is a biomass with very potential, especially in agricultural countries. In this research, a study related to pretreatment and the ratio of C/N to biogas production from sugarcane bagasse was conducted. The study was carried out on a laboratory scale with physical pretreatment by grinding with a size of 6 mesh, then biological pretreatment with the microbial consortium 5 % g/V, and variations in the C/N ratio at 25 and 30. Cow rumen fluid was used in this study as a source of anaerobic bacteria and technical urea is used to adjust the C/N ratio. The solid total is set at 7 %. Based on research that has been carried out for 60 days, it was found that physical pretreatment by grinding with a size of 6 mesh can increase biogas production. Biogas production increased both at C/N ratio conditions of 25 and 30. Furthermore, biological pretreatment with the microbial consortium 5 % g/V was proven to increase biogas production at both C/N ratios of 25 and 30. Further studies on the C/N ratio, it was found that the C/N ratio of 25 was better than the C/N ratio of 30. This is evident in several variables, including raw and fine substrate conditions, as well as on variables with or without a microbial consortium, with the amount of biogas productivity at a C/N 25 ratio of 53-90.5 % higher than the C/N 30 ratio. © 2023 The Authors. All rights reserved.

关键词： Biogas Biological pretreatment Physical pretreatment Sugarcane bagasse

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Smart tailoring of molecular catalysts:Mounting approach to oxygen reduction reaction

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Journal of Materials science & Technology 2024年第1期168卷 169-184页

作者： Anuj Kumar Mohd Ubaidullah Guoxin Zhang Jasvinder Kaur Saira Ajmal Mudassir Hasan Krishna Kumar Yadav Hafiz M.Adeel Sharif Ram K.Gupta Ghulam Yasin Nano-Technology Research Laboratory Department of ChemistryGLA UniversityMathuraUttar Pradesh 281406India Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdaoShandong 266590China Institute for Advanced Study Shenzhen UniversityShenzhenGuangdong 518060China Department of Chemistry Kansas Polymer Research CenterPittsburg State UniversityPittsburgKS 66762United States Faculty of Science and Technology Madhyanchal Professional UniversityRatibadBhopal 462044India Environmental and Atmospheric Sciences Research Group Scientific Research CenterAl-Ayen UniversityThi-QarNasiriyah 64001Iraq Department of Chemical Engineering King Khalid University Saudi Arabia Department of Chemistry School of SciencesIFTM UniversityMoradabadUttar Pradesh 244102India Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China School of Environment and Civil Engineering Dongguan University of TechnologyDongguanGuangdong 523808China

Efficient electrocatalytic rupture of energy-rich molecules(H_(2)and O_(2))is a green approach for gener-ating clean energy for modern *** this context,porphyry-type molecular electrocatalysts act intelligently toward oxygen reduction reaction(ORR),a fundamental process in fuel cells,due to their redox-rich chemistry,which involves core metal ions and macrocyclic *** concerned scientific community has tried many times to correlate the ORR intermediates with their formation kinetics and simplify the associated multi H+/e-stages during the ORR process,constructing several volcano plots be-tween catalytic Tafel data,turnover frequencies,and overpotentials for many *** the fact that many review articles on molecular electrocatalysts for ORR have been published,understanding the strategic implications and molecular catalyst intelligence towards homogenous ORR has been poorly *** review examined the relationships between volcano plots of current *** parameters and the Sabatier principle in order to explain the intelligence of molecular electrocatalysts and approaches for their creation,as well as the difficulties and potential prospects of molecular *** facts distinguish this review from previously published articles and will pique the scien-tific community’s interest in avoiding trial-and-error procedures for catalyst creation while also allowing for more exact evaluations of the molecular catalyst’s performance.

关键词： Electrocatalysis Molecular catalysts Oxygen reduction reaction Sabatier principle

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Hornification of Softwood and Hardwood Pulps Correlating with a Decrease in Accessible Surfaces

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ACS Omega 2025年第24期10卷 26164-26171页

作者： Carl Moser Björn Sjöstrand Wallenberg Wood Science Center Department of Fibre and Polymer Technology KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Chemical Engineering Department of Engineering and Chemical Sciences Karlstad University 651 88 Karlstad Sweden

This study aimed to investigate the relationship between hornification and the accessible surface area for cellulosic pulps in order to obtain a better understanding of the mechanisms behind hornification. Hardwood and softwood paper grades were hornified to varying degrees by sequential high-temperature drying cycles, and the degree of hornification was assessed by water retention, which was shown to decrease linearly and to correlate closely with accessible surface areas measured by xyloglucan adsorption for both hardwood and softwood pulps. The relationship between hornification ratios and accessible surfaces for xyloglucan adsorption shows different linear relationships above and below 100 °C, supporting the hypothesis of different hornification mechanisms at different temperatures shown in the previous literature. Furthermore, hornification was shown to cause a reduction in fiber width for softwood pulps and a reduction in fiber length for hardwood fibers.

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Nanofibers for the Immunoregulation in Biomedical Applications

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Advanced Fiber Materials 2022年第6期4卷 1334-1356页

作者： Liwen Fu Qian Feng Yujie Chen Jingzhong Fu Xiaojun Zhou Chuanglong He State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Biological Science and Medical EngineeringDonghua UniversityShanghai 201620China Department of Thoracic Oncology Jiujiang Cancer HospitalJiujiang 332000China

Despite great efforts and achievement of nanomaterials in immune-associated diseases,the selection of appropriate nanomaterials and preparation technology remain some challenges and vast room for *** has received tremendous attention throughout the medical process due to its clinical successes with the pathways of immunoactivation or ***,fibrous nanomaterials have facilitated advances in tissue repair and cancer treatments owing to the superiority of multi-channel structure,biocompatibility,tunable size and controlled surface *** immunoactivation-based nanofibers can potentially deliver functional agents to lesions and further actively promote immunologic *** the contrary,the immunosuppression-based nanofibers prevent the immune system from overreacting through the blockage of critical pathways in *** review summarizes the current application of nanofiber materials in diverse diseases,including cancer therapy,tissue regeneration(cartilage/bone,skin,tendon,nerves),myocardial infarction,psoriasis and organ *** common fabrication technologies of biomedical nanofibers are also ***,the existing technical barriers and perspectives are rationally discussed,providing a constructive inspiration for the follow-up basic research and clinical transformation of nanofibers in the vibrant biomedical fields.

关键词： Nanofibers Immunoregulation Tissue repair Cancer therapy

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Stereoselective Ring-Opening polymerization of rac-Lactide Catalyzed by Squaramide Derived Organocatalysts at Room Temperature

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Chinese Journal of Chemistry 2021年第9期39卷 2403-2409页

作者： Xiao Jiang Na Zhao Zhibo Li Key Laboratory of Biobased Polymer Materials Shandong Provincial Education DepartmentCollege of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdaoShandong 266042China

Substa ntial progresses have bee n made toward the developme nt of meta I-free catalysts for stereoselective rin g-ope ning polymeriza-tion(ROP)of *** the discovery of organic catalysts effective at ambient temperature remains a major ***,the bifunctional H-bonding catalyst SQ-1 containing a basic tertiary amine and squaramide motif proved to be good candidate for the stereoselective ROP of rac-lactide at room temperature,yielding stereoregular polylactide with controlled molecular weights(up to 21.1 kg/mol)and high tacticity(PjESC up to 0.88).Furthermore,binary H-b on ding catalytic system con sisti ng of squaramides(SQ-2 to SQ-6)and 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)could efficiently promote the ROP of rac-lactide at room temperature within short reaction *** them,the most bulky squaramide SQ-2 exhibited the best steroselectivity towards the ROP of rac-lactide without transesterification side reactions during the polymerization *** resulting polylactides were proved to have controlled molecular weights as high as 22.2 kg/mol and narrow distributions(1.10-1.24).

关键词： Ring-opening polymerization Organocatalysis Squaramide polymers Stereoselective

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Unconventional assemblies of bisacylhydrazones:The role of water for circularly polarized luminescence

Aggregate

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Aggregate 2022年第5期3卷 185-193页

作者： Hye Jin Cho Dong Yeun Jeong Hwihyun Moon Taewoo Kim You Kyoung Chung Yeongdong Lee Zonghoon Lee Joonsuk Huh Youngmin You Changsik Song Department of Chemistry Sungkyunkwan UniversitySuwonGyeonggi 16419Republic of Korea Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and EngineeringEwha Womans UniversitySeoul 03760Republic of Korea Center for Multidimensional Carbon Materials Institute for Basic Science(IBS)Department of Materials Science and EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

Understanding the precise molecular arrangement of chiral supramolecular polymers is essential not only to comprehend complex superstructures like proteins and DNA but also for the development of next-generation optoelectronic materials,including materials displaying high-performance circularly polarized luminescence(CPL).Herein,we report the first chiral supramolecular polymer systems based on hydrazone–pyridinium conjugates comprising alkyl chains of different lengths,which afforded control of the apparent supramolecular *** supramolecular chirality is governed basically by the remote chiral centers of alkyl chains,helicity inversion was achieved by controlling the conditions under which the hydrazone building blocks underwent aggregation(i.e.,solvent compositions or temperature).More importantly,the addition of water to the system led to aggregationinduced hydrazone deprotonation,which resulted in a completely different selfassembly *** water molecules played an essential role,forming the assembly’s channel-like backbone,around which hydrazone molecules gathered as a result of hydrogen bonding *** co-assembly of an achiral hydrazone luminophore with the given supramolecular polymer system allowed the fabrication of a novel CPL-active hydrazone-based material exhibiting a high maximum value for the photoluminescence dissymmetry factor of -2.6×10^(-2).

关键词： circularly polarized luminescence(CPL) helicity control hydrazone self-assembly structural water supramolecular polymerization

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Relationship between drought and soil erosion based on the normalized differential water index(NDWI)and revised universal soil loss equation(RUSLE)model

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Regional Sustainability 2024年第4期5卷 133-144页

作者： Muhammad RENDANA Wan Mohd Razi IDRIS Febrinasti ALIA Supli Effendi RAHIM Muhammad YAMIN Muhammad IZZUDIN Department of Chemical Engineering Faculty of EngineeringUniversitas SriwijayaIndralaya30662Indonesia Master Program of Environmental Management Graduate SchoolUniversitas SriwijayaPalembang30139Indonesia Department of Earth Sciences and Environment Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Civil Engineering Faculty of EngineeringUniversitas SriwijayaIndralaya30662Indonesia Master Program of Agricultural Sciences Graduate Study ProgramUniversitas Muhammadiyah PalembangPalembang30263Indonesia Department of Agribusiness Faculty of AgricultureUniversitas SriwijayaIndralaya30662Indonesia Department of Sociology Faculty of Social and Political SciencesUniversitas SriwijayaIndralaya30662Indonesia

The Langat River Basin in Malaysia is vulnerable to soil erosion risks because of its exposure to intensive land use activities and its topography,which primarily consists of steep slopes and mountainous ***,climate change frequently exposes this basin to drought,which negatively affects soil and water ***,recent studies have rarely shown how soil reacts to drought,such as soil ***,the purpose of this study is to evaluate the relationship between drought and soil erosion in the Langat River *** analyzed drought indices using Landsat 8 satellite images in November 2021,and created the normalized differential water index(NDWI)via Landsat 8 data to produce a drought *** used the revised universal soil loss equation(RUSLE)model to predict soil *** verified an association between the NDWI and soil erosion data using a correlation *** results revealed that the southern and northern regions of the study area experienced drought *** predicted an average annual soil erosion of approximately 58.11 t/(hm^(2)·a).Analysis of the association between the NDWI and soil erosion revealed a strong positive correlation,with a Pearson correlation coefficient of *** assumed that the slope length and steepness factor was the primary contributor to soil erosion in the study *** a result,these findings can help authorities plan effective measures to reduce the impacts of drought and soil erosion in the future.

关键词： Drought Soil erosion Normalized differential water index(NDWI) Revised universal soil loss equation(RUSLE) Langat River Basin

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