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The Role of Aldehyde-Functionalized Crosslinkers on the Property of Chitosan Hydrogels (vol 22, 2100477, 2022)

MACROMOLECULAR BIOscience 2022年第10期22卷 e2200366页

作者： Yeh, Ying-Yu Tsai, Yu-Ting Wu, Chun-Yu Tu, Ling-Hsien Bai, Meng-Yi Yeh, Yi-Cheun Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Graduate Institute of Biomedical Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan Department of Chemistry National Taiwan Normal University Taipei 11677 Taiwan Biomedical Engineering Program Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei 10607 Taiwan Adjunct Appointment to the Department of Biomedical Engineering National Defense Medical Center Taipei 11490 Taiwan

Chitosan has been utilized as a popular biopolymer to fabricate hydrogels for biomedical applications. However, chitosan hydrogels are generally too brittle to mimic the deformability of the extracellular matrix in many tissues and organs. In particular, the role of the varied crosslinkers in determining the elasticity of chitosan hydrogels is lack of discussion. Here, three aldehyde-functionalized crosslinkers (i.e., aldehyde-modified poly(xylitol sebacate)- co -poly(ethylene glycol) (APP), glutaraldehyde (GA), and polydextran aldehyde (PDA)) are used to react with quaternized chitosan (QCS) through imine bonds to form hydrogels. The microstructures, mechanical performances, and cytocompatibility of the three hydrogels are systematically investigated. The APP/QCS hydrogels presented the best compressive and stretch properties among the three hydrogels. The mechanical property and antibacterial activity of APP/QCS hydrogels can be further modulated using varied QCS amounts, where more QCS contributed higher stiffness and stretchability as well as better bacterial inhibition to the APP/QCS hydrogels. Taken together, it is demonstrated that the inherent elastomeric characteristic of APP crosslinker provides the desirable elasticity and stretchability to QCS hydrogels compared to the other aldehyde-functionalized crosslinkers of GA and PDA. This strategy of using multivalent elastomeric crosslinkers to fabricate deformable chitosan hydrogels can expand the use of chitosan hydrogels in tissue engineering applications.

关键词： antibacterial property chitosan elasticity hydrogels stretchability

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Facilely prepared layer-by-layer graphene membrane-based pressure sensor with high sensitivity and stability for smart wearable devices

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Journal of Materials science & Technology 2020年第10期42卷 241-247页

作者： Tao Liu Caizhen Zhu Wei Wu Kai-Ning Liao Xianjing Gong Qijun Sun Robert K.Y.Li Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina Institute of Low-dimensional Materials Genome Initiative College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen518060China National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering of Ministry of EducationSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640China State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China

With the prosperous development of artificial intelligence,medical diagnosis and electronic skins,wearable electronic devices have drawn much attention in our daily *** pressure sensors based on carbon materials with ultrahigh sensitivity,especially in a large pressure range regime are highly required in wearable *** this work,graphene membrane with a layer-by-layer structure has been successfully fabricated via a facile self-assembly and air-drying(SAAD)*** the SAAD process,air-drying the self-assembled graphene hydrogels contributes to the uniform and compact layer structure in the obtained *** to the excellent mechanical and electrical properties of graphene,the pressure sensor constructed by several layers of membranes exhibits high sensitivity(52.36 kPa……-1)and repeatability(short response and recovery time)in the loading pressure range of 0–50 *** with most reported graphene-related pressure sensors,our device shows better sensitivity and wider applied pressure ***’s more,we demonstrate it shows desired results in wearable applications for pulse monitoring,breathing detection as well as different intense motion recording such as walk,run and ***’s hoped that the facilely prepared layer-by-layer graphene membrane-based pressure sensors will have more potential to be used for smart wearable devices in the future.

关键词： Graphene membrane Self-assembly High sensitivity Wearable devices Human motions

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Effect of Process Variable on Production of Thermoplastic Vulcanizates Based on Sebs/Pp/Lldpe Via Reactive Extrusion

SSRN

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SSRN 2024年

作者： Dana, Mehri Zohuri, Gholam Hossein Nabid, Mohammad Reza Shahidi, Saeid Asadi Yazdanbakhsh, Sohail Department of Polymer & Materials Chemistry Faculty of Chemistry and Petroleum Science Shahid Beheshti University GC ***Tehran Iran Department of Materials Engineering Pouya Gostar Khorasan Co. of Part Lastic Group Mashhad Iran Department of Chemistry Faculty of Science Ferdowsi University of Mashhad Mashhad Iran Environmental Chemistry Research Centre Department of Chemistry Faculty of Science Ferdowsi University of Mashhad Mashhad Iran

Properties of thermoplastic vulcanizates (TPVs) depend on their microstructure. Processing conditions including shear rate, processing temperature and shearing time can affect the final microstructure of TPVs. The object of this study is to investigate the effect of temperature (210-230 °C, 170-190 °C, 150-170 °C and 140-160 °C) and speed of production process on the properties of TPV based on poly(styrene-b-(ethylene-co-butylene)-b styrene) triblock copolymer (SEBS)/ polypropylene (PP)/ linear low-density polyethylene (LLDPE) prepared via reactive extrusion. Melt flow index (MFI) of the prepared samples was sharply decreased (from 24.4 to 2.63 g/10 min at 190 °C, 10 kg) with decreasing temperature (from 210-230 °C to 170-190 °C). However, hardness of the prepared TPVs was increased to a limiting value (80 shore A) with decreasing the process temperature. Compression set sharply decreased (from 70% to 49% at 120 °C, 70 h) and it has reached to a limiting value (46%). The process temperature, however, is not significantly affected on the tensile strength and tensile strength at 20% extension of the TPV. The elongation has the lowest value in 170-190 °C. Result of elongation at break after aging was improved (from 12.2% to 3.3%) with decreasing process temperature (from 140-160 °C to 210-230 °C). The lowest value of tensile strength (4.1%) was obtained in 170-190 °C after aging. Due to the increase in speeds of the twin screw extruder (180 to 250 rpm, in 140-160 °C) surface quality was suitable and smooth. Also TPV samples were prepared by either one-step or two-step reactors using the extruder system and the results were compared. In the one-step method, a pronounced higher value in elongation at break (897%) and MFI (6.8 g/10min at 190 °C, 10 kg) were observed. It was found that the results of heat aging were improved using the two-step process. The two-step process led to higher tensile stress at 20% extension (from 2.7 to 3.3 MPa), too. In addition, a comprehensiv

关键词： Tensile strength

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Analysis of concentration polarization in reverse osmosis and nanofiltration: zero-, one-, and two-dimensional models

arXiv

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arXiv 2024年

作者： Biesheuvel, P.M. Porada, S. Blankert, B. Ryzhkov, I. Elimelech, M. Wetsus European Centre of Excellence for Sustainable Water Technology Netherlands Department of Process Engineering and Technology of Polymer and Carbon Materials Wroclaw University of Science and Technology Poland Water Desalination and Reuse Center King Abdullah University of Science and Technology Saudi Arabia Institute of Computational Modeling SB RAS Krasnoyarsk Russia Siberian Federal University Krasnoyarsk Russia Department of Chemical and Environmental Engineering Yale University United States

Reverse osmosis and nanofiltration are membrane-based methods that remove solutes from solvent, for instance they remove salts from water (desalination). In these methods, an applied pressure is the driving force for solvent to pass the membrane, while most of the solutes are blocked. Very important in the theory of mass transport is the concentration polarization layer (CP layer), which develops on the upstream side of the membrane. Because of the CP layer, the solvent flux through the membrane is reduced while leakage of solutes through the membrane increases, and both these effects must be minimized. So it is very important to understand and describe the nature of the CP layer accurately, especially to find a good estimate of the CP layer mass transfer coefficient, k. This is also important for the accurate characterization of membranes in a test cell geometry. We theoretically analyse the structure of the CP layer using three levels of mathematical models. First, we present a modification of an equation for k by Sherwood et al. (1965) and show that it works very well in a zero dimensional model. Second, we evaluate a one-dimensional model that is more accurate, which can incorporate any equation for the flow of solvent and solutes through the membrane, and which also makes use of the new modified Sherwood equation. Finally, we fully resolve the complete channel in a two-dimensional geometry, to validate the lower-order models and to illustrate the structure of the CP layer. The overall conclusion is that for typical test cell conditions, the modified Sherwood equation can be used to characterize the CP layer, also when solvent flux through the membrane changes between inlet and outlet of the test cell. Furthermore, the one-dimensional model accurately describes solute removal (for instance water desalination) not just in a short test cell but also in a longer module. Copyright © 2024, The Authors. All rights reserved.

关键词： Solvents

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Highly dispersed Ru nanoparticles anchored on NiAl layered double oxides catalyst for selective hydrodeoxygenation of vanillin

arXiv

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arXiv 2024年

作者： Zeng, Yongjian Lin, Lu Hu, Di Jiang, Zhiwei Saeed, Shaimaa Guo, Ruichao Ashour, Ibrahim Yan, Kai Guangdong Provincial Key Laboratory of Environmental Pollution and Remediation Technology School of Environmental Science and Engineering Sun Yat-sen University 135 Xingang Xi Road Guangzhou510275 China School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and Technologies Key Lab of Polymer Composite & Functional Materials Sun Yat-sen University 135 Xingang Xi Road Guangzhou510275 China Guangdong Laboratory for Lingnan Modern Agriculture South China Agricultural University Guangzhou510642 China Chemical Engineering Department Tanta Higher Institute of Engineering and Technology Tanta Egypt Chemical Engineering Department Faculty of Engineering Minia University Tanta Egypt

The hydrodeoxygenation (HDO) of lignin-derived feedstocks into value-added chemicals with high efficiency and selectivity is desirable for the utilization of biomass resource. The complex oxygen-containing groups of lignin-derived substance result in the challenge of the low selectivity toward the required product. In this work, highly dispersed Ru nanoparticles anchored on Ni3Al1 layered double oxides (LDOs) catalyst derived from NiAl layered double hydroxides (LDHs) with flower-shaped morphology was constructed by a simple deposition-reduction method. The introduction of LDHs-derived support can significantly impact the catalytic activity for the HDO of lignin-derived vanillin (VL) into 2-methoxy-4-methylphenol (MMP). The Ru/Ni3Al1-400 catalyst obtained complete conversion of VL and 94.2% yield of MMP at 130 °C in methanol solvent, much better than the catalysts without LDHs-derived support. The methanol solvent is beneficial for the conversion of reaction intermediate of vanillin alcohol (VA). Detailed characterization reveals that the existence of the enhanced metal-support interaction over Ru/Ni3Al1-400 and the easily accessible acid sites facilitate the production of MMP. Copyright © 2024, The Authors. All rights reserved.

关键词： Lignin

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Correction: Chitosan-based inks for 3D printing and bioprinting (Green Chemistry (2022) 24 (62-101) DOI: 10.1039/D1GC01799C)

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Green Chemistry 2025年第18期27卷 5388-5388页

作者： Mohsen Taghizadeh Ali Taghizadeh Mohsen Khodadadi Yazdi Payam Zarrintaj Florian J. Stadler Joshua D. Ramsey Sajjad Habibzadeh Somayeh Hosseini Rad Ghasem Naderi Mohammad Reza Saeb Masoud Mozafari Ulrich S. Schubert College of Materials Science and Engineering Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional Materials Shenzhen University Shenzhen 518060 PR China Center of Excellence in Electrochemistry School of Chemistry College of Science University of Tehran Tehran Iran School of Chemical Engineering Oklahoma State University 420 Engineering North Stillwater OK 74078 USA Department of Chemical Engineering Amirkabir University of Technology (Tehran Polytechnic) Tehran 15916-39675 Iran Department of Mechanical Engineering Polytechnique Montreal Montreal QC Canada Iran Polymer and Petrochemical Institute (IPPI) Tehran Iran Department of Polymer Technology Faculty of Chemistry Gdańsk University of Technology G. Narutowicza 11/12 80-233 Gdańsk Poland Department of Tissue Engineering & Regenerative Medicine Faculty of Advanced Technologies in Medicine Iran University of Medical Sciences Tehran Iran Laboratory of Organic and Macromolecular Chemistry (IOMC) Friedrich Schiller University Jena Humboldtstrasse 10 07743 Jena Germany Center for Energy and Environmental Chemistry Jena (CEEC Jena) Friedrich Schiller University Jena Philosophenweg 7a 07743 Jena Germany

In the original publication, an incorrect citation was erroneously included for ref. 161. The authors would like to replace ref. 161 with the correct citation, which is shown below as ref. 1. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers. © 2025 The Royal Society of Chemistry.

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Deciphering a structural signature of glass dynamics by machine learning

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Physical Review B 2022年第21期106卷 214206-214206页

作者： Han Liu Morten M. Smedskjaer Mathieu Bauchy SOlids inFormaTics AI-Laboratory (SOFT-AI-Lab) College of Polymer Science and Engineering Sichuan University Chengdu 610065 China Department of Chemistry and Bioscience Aalborg University Aalborg 9220 Denmark Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab) Department of Civil and Environmental Engineering University of California Los Angeles California 90095 USA

The dynamics of atoms plays a key role in governing various dynamical and transport properties of glasses. However, it remains elusive which structural features (if any) control atom dynamics in glasses. Here, based on million-atom molecular dynamics simulations and classification-based machine learning, we extract a needle in a haystack by identifying a local, nonintuitive structural signature (a revised version of the recently developed softness metric) that governs glass dynamics. We do so by investigating the ion mobility in sodium silicate glasses—a realistic, archetypal glass—finding that the sodium ion mobility is largely encoded in its initial softness, wherein softer Na atoms exhibit higher mobility. Importantly, our approach allows us to interpret the machine-learned softness metric and thus elucidate the atomistic origin of the ion mobility. Namely, we find that Na mobility is anticorrelated with the local density of defect oxygen neighbors that are located between the nearest two coordination shells. This local packing order offers a potential path to develop glass formulations with tailored dynamical properties. Finally, we demonstrate that the softness is strongly anticorrelated with the activation energy for Na atom reorganization.

关键词： Structural properties Complex oxides Glasses Machine learning Molecular dynamics

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Carbon‐based metal‐free catalysts for electrochemical CO2 reduction: Activity, selectivity, and stability

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Carbon Energy 2021年第1期3卷 24-49页

作者： Israr Masood ul Hasan Luwei Peng Jianfeng Mao Ruiman He Yongxia Wang Jing Fu Nengneng Xu Jinli Qiao State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Environmental Science and EngineeringDonghua UniversityShanghaiChina Shanghai Institute of Pollution Control and Ecological Security ShanghaiChina Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNew South WalesAustralia School of Materials Science and Engineering Tongji UniversityShanghaiChina Department of Chemical Engineering University of Louisiana at LafayetteLafayetteLouisianaUSA Institute for Materials Research and Innovation University of Louisiana at LafayetteLafayetteLouisianaUSA

Zero or negative emissions of carbon dioxide(CO2)is the need of the times,as inexorable rising and alarming levels of CO2 in the atmosphere lead to global warming and severe climate *** electrochemical CO2 reduction(eCO2R)to value‐added fuels and chemicals by using renewable electricity provides a cleaner and more sustainable route with economic benefits,in which the key is to develop clean and economical ***‐based catalyst materials possess desirable properties such as high offset potential for H2 evolution and chemical stability at the negative applied *** it is still challenging to achieve highly efficient carbon‐based catalysts,considerable efforts have been devoted to overcoming the low selectivity,activity,and ***,we summarize and discuss the recent progress in carbon‐based metal‐free catalysts including carbon nanotubes,carbon nanofibers,carbon nanoribbons,graphene,carbon nitride,and diamonds with an emphasis on their activity,product selectivity,and *** addition,the key challenges and future potential approaches for efficient eCO2R to low carbon‐based fuels are *** a good understanding of the whole history of the development of eCO2R,the CO2 reduction reactions,principles,and techniques including the role of electrolytes,electrochemical cell design and evaluation,product selectivity,and structural composition are also *** metal/metal oxides decorated with carbon‐based electrocatalysts are also *** aim to provide insights for further development of carbon‐based metal‐free electrocatalysts for CO2 reduction from the perspective of both fundamental understanding and technological applications in the future.

关键词： activity carbon‐based catalyst CO2 electrochemical reduction selectivity stability

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α−Fe2O3 nanoparticles and hazardous air pollutants release during cooking using cast iron wok in a commercial Chinese restaurant

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environmental Pollution 2022年 307卷 119578页

作者： Le, Yen Thi-Hoang Youn, Jong-Sang Cho, Hyunwook Jeon, Kwonho Lim, Jaehyun Jeon, Ki-Joon Program on Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of Department of Energy and Environmental Engineering The Catholic University of Korea 43 Jibong-ro Gyeonggi-do Bucheon-si14662 Korea Republic of Department of Environmental Engineering Inha University Incheon22212 Korea Republic of National Institute of Environmental Research Global Environment Research Division Incheon22689 Korea Republic of Particle Pollution Research and Management Center Incheon21999 Korea Republic of

Long-term exposure to fine particles (PM2.5), ultrafine particles (UFPs), and volatile organic compounds (VOCs) emissions from cooking has been linked to adverse human health effects. Here, we measured the real-time number size distribution of particles emitted when cooking two served food in Chinese restaurants and estimated the emission rate of UFPs and PM2.5. Experiments were conducted under a control hood, and both online measurement and offline analysis of PM2.5 were carried out. The measured emission rates of PM2.5 generated from deep-frying and grilling were 0.68 ± 0.11 mg/min and 1.58 ± 0.25 mg/min, respectively. Moreover, the UFPs emission rate of deep-frying (4.3 × 109 #/min) is three times higher than that of grilling (1.4 × 109 #/min). Additionally, the PM2.5 emission of deep-frying was comprised of a considerable amount of α−Fe2O3 (5.7% of PM2.5 total mass), which is more toxic than other iron oxide species. A total of six carcinogenic HAPs were detected, among which formaldehyde, acrolein, and acetaldehyde were found to exceed the inhalation reference concentration (RfC) for both cooking methods. These findings can contribute to future evaluation of single particle and HAPs emission from cooking to better support toxicity assessment. © 2022 Elsevier Ltd

关键词： Volatile organic compounds

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Hyaluronic Acid Microparticles Performing a Vascular Role in Heparg Spheroids

SSRN

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SSRN 2023年

作者： Park, Kyoung Hwan Ryu, Bokyeong Song, Jin Jung Shim, Hye-Eun Song, Sun-Sook Han, Ji-Seok Kim, C-Yoon Huh, Kang Moo Kang, Sun-Woong Daejeon34114 Korea Republic of Department of Polymer Science and Engineering Chungnam National University Daejeon34134 Korea Republic of Department of Veterinary Physiology College of Veterinary Medicine Konkuk University Seoul05029 Korea Republic of Department of Toxicological Evaluation and Research Korea Institute of Toxicology Daejeon34114 Korea Republic of Human and Environmental Toxicology Program University of Science and Technology Daejeon34114 Korea Republic of

Three-dimensional (3D) cell culture is a promising method for preserving the mature functions of cultured cells based on advantageous structural characteristics. Because of the convenience of manufacture, one of the most used 3D cell culture methods is spheroid culture. The successful application of spheroids requires that cells survive inside a structure and engraft at transplantation sites. In this study, we proposed new concept of spheroid formation method containing hyaluronic acid (HA) microparticles. HA microparticles fabricated by an inverse emulsion method with crosslinking reaction of HA showed micro-sized interconnected pore structures. The spheroids containing HA microparticles were uniform in size and showed higher cell migration activity in matrigel. After transplantation of spheroids into the liver of mouse, the spheroids containing HA microparticles showed a higher survival rate and albumin secretion ability than the plain spheroids. Thus, a 3D cell culture system with HA microparticles in spheroids could be a promising strategy to improve the engraftment and efficiency of cell therapy for next-generation regenerative medicine. © 2023, The Authors. All rights reserved.

关键词： Hyaluronic acid

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