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chemically Recyclable Polyethylene-like Sulfur-Containing Plastics from Sustainable Feedstocks

Angewandte Chemie 2023年第13期135卷

作者： Yanni Xia Xinchen Yue Yue Sun Chengjian Zhang Xinghong Zhang MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X Polymers Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Center of Chemistry for Frontier Technologies Zhejiang University Hangzhou 310027 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Hangzhou 310027 China

The green revolution in plastics should be accelerated due to growing sustainability concerns. Here, we develop a series of chemically recyclable polymers from the first reported cascade polymerization of H 2 O, COS, and diacrylates. In addition to abundant feedstocks, the method is efficient and air-tolerant, uses common organic bases as catalysts, and yields polymers with high molecular weights under mild conditions. Such polymers, structurally like polyethylene with low-density in-chain polar groups, manifest impressive toughness and ductility comparable to high-density polyethylene. The in-chain ester group acts as a breaking point, enabling these polymers to undergo chemical recycling through two loops. The structures and properties of these polymers also have an immeasurably expanded range owing to the versatility of our method. The readily available raw materials, facile synthesis, and high performance make these polymers promising prospects as sustainable materials in practice.

关键词： Plastic Recycling Polyester Polymer Synthesis Recyclable Polymers Sustainable Polymers

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Agar-altered foaming bacterial cellulose with carvacrol for active food packaging applications

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Food Packaging and Shelf Life 2024年 42卷

作者： Kusuma, Anita Chandra Chou, Yu-Chieh Hsieh, Chen-Che Santoso, Shella Permatasari Go, Alchris Woo Lin, Hong-Ting Victor Hsiao, I.-Lun Lin, Shin-Ping Master Program in Food Safety Taipei Medical University 250 Wu-Hsing Street Taipei 11031 Taiwan Ph.D. Program in Drug Discovery and Development Industry Taipei Medical University 250 Wu-Hsing Street Taipei 11031 Taiwan Institute of Biotechnology National Taiwan University 1 Roosevelt Rd. Section 4 Taipei 10617 Taiwan Department of Chemical Engineering Widya Mandala Surabaya Catholic University Kalijudan 37 Surabaya 60114 Indonesia Department of Chemical Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei 10607 Taiwan Department of Food Science National Taiwan Ocean University No. 2 Pei-Ning Road Keelung 20224 Taiwan School of Food Safety Taipei Medical University 250 Wu-Hsing Street Taipei 11031 Taiwan TMU Research Center for Digestive Medicine Taipei Medical University 250 Wu-Hsing Street Taipei 11031 Taiwan Research Center of Biomedical Device Taipei Medical University 250 Wu-Hsing Street Taipei 11031 Taiwan

Bacterial cellulose (BC) is a biodegradable nanoscale film produced by microorganisms, which possesses great mechanical properties and biocompatibility. In this study, we produced foaming BC (FBC) utilizing foam medium with different concentrations of agar. In addition, carvacrol was loaded into the agar/FBC to establish active packaging material. Evaluation by characterization tests indicated that agar/FBC provided lower crystallinity (59.8%∼71.4%) and a high swelling ability (94.7%∼97.9%) compared to BC (92.2% and 96.1%). The 1.5% agar/FBC with carvacrol group exhibited the significantly highest antimicrobial properties against Escherichia coli and Staphylococcus aureus. Moreover, release measurements showed that greater agar addition contributed to higher protein and carvacrol release extents out of the film. Finally, a sea bass packaging test indicated that carvacrol with 1.5% agar/FBC presented a higher antimicrobial ability against Shewanella putrefaciens, great inhibition of lipid oxidation (67.5%), and a slower spoilage degree (49.8%) which suggested that agar/FBC with carvacrol has potential for active food packaging. © 2024 Elsevier Ltd

关键词： Agar Bacterial cellulose Carvacrol Foaming bacterial cellulose Food packaging Sea bass

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Gmr Biosensing with Magnetic Nanowires as Labels for the Detection of Osteosarcoma Cells

SSRN

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SSRN 2022年

作者： Su, Diqing Um, Joseph Moreno, Julian Nemati, Zohreh Srinivasan, Karthik Chen, Junyang Kouhpanji, M. Reza Zamani Shore, Daniel Wu, Kai Kosel, Jürgen Modiano, Jaime F. Franklin, Rhonda Wang, Jian-Ping Stadler, Bethanie Department of Chemical Engineering and Materials Science University of Minnesota MinneapolisMN55455 United States Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN55455 United States Electrical Engineering Department King Abdullah University of Science and Technology Thuwal 23955 Saudi Arabia Animal Cancer Care and Research Program University of Minnesota St. PaulMN55108 United States Department of Veterinary Clinical Sciences College of Veterinary Medicine University of Minnesota St. PaulMN55108 United States Masonic Cancer Center University of Minnesota MinneapolisMN55455 United States Center for Immunology University of Minnesota MinneapolisMN55455 United States Stem Cell Institute University of Minnesota MinneapolisMN55455 United States Institute for Engineering in Medicine University of Minnesota MinneapolisMN55455 United States

Magnetic nanowires (MNWs) were explored as potential magnetic tags for cell detection with giant magnetoresistance (GMR) biosensors based on a handheld system. Due to size, shape anisotropy and higher moment materials, the signal detected from a single MNW was 2500 times larger than that from a single magnetic iron oxide nanobead, which is important for ultra-low concentration cell detection. A model was used to determine how the MNW orientation with respect to the GMR sensor impacts detection performance, and the results aligned well with the experimental results. As a proof of concept OSCA-8 cells tagged with Ni MNWs were also detected using the same handheld system. The limit of detection (LOD) in aqueous solution appeared to be 133 cells, and single-cell detection can be realized if the cell is in direct contact with the sensor surface. Since MNWs are already employed in magnetic separation of cells, directly using MNWs as tags in cell detection eliminates the need of additional functionalization with other labels. This largely simplifies the detection process and reduces the risk of contamination during sample preparation. © 2022, The Authors. All rights reserved.

关键词： Biosensors

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Isomeric 1,4-Dihydropentalene-Containing Building Blocks for High Mobility Ladder-Type Conjugated Polymers

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Angewandte Chemie 2025年

作者： Shengnan Zhang Yuqian Liu Hao Dong Yanru Li Kai Zhang Kaihu Xian Prof. Yang Han Prof. Long Ye Prof. Martin Heeney Prof. Zhuping Fei Institute of Molecular Plus Department of Chemistry and Haihe Laboratory of Sustainable Chemical Transformations Key Laboratory of Organic Integrated Circuits Ministry of Education Tianjin University Tianjin 300072 China School of Materials Science & Engineering Tianjin Key Laboratory of Molecular Optoelectronic Sciences and Collaborative Innovation Center of Chemical Science and Engineering Tianjin University Tianjin 300350 China Institute for Electric Light Sources School of Information Science and Technology Fudan University Shanghai 200433 China Division of Physical Sciences & Engineering Chemistry Program King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

Nearly amorphous conjugated polymers, though lacking long-range order, can exhibit high charge carrier mobility and enhanced flexibility, making them ideal for flexible or stretchable OFET applications. However, research on novel structural blocks for this class of materials remains limited. We report the synthesis of two derivatives of the 5,10-dihydroindeno[2,1- a ]indene (DHI) core, where two thieno groups are appended to each end to reduce torsional disorder with adjacent comonomers. The two 1,4-dihydropentalene containing isomers, anti-C16DHIT-Br and syn-C16DHIT-Br, feature distinct thieno group orientations, leading to differences in their electronic properties. The anti-isomer shows a fully delocalized conjugation pathway, whereas the syn isomer exhibits cross-conjugation, limiting delocalization along the polymer backbone. These monomers were copolymerized with benzothiadiazole (BT) to form two conjugated polymers, anti-C16DHIT-BT and syn-C16DHIT-BT, both with highly planar backbones, good solubility, and solution processability. Morphological studies reveal that anti-C16DHIT-BT exhibits more ordered stacking and higher crystallinity than syn-C16DHIT-BT. Devices based on anti-C16DHIT-BT show significantly better performance, with a hole mobility of 2.38 cm 2 V −1 s −1 , slightly higher than the widely studied pIDTBT under identical conditions.

关键词： Conjugated polymers High mobility Isomerization effect Novel building blocks Organic field-effect transistors

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Mercury transformation processes in nature: Critical knowledge gaps and perspectives for moving forward

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Journal of Environmental sciences 2022年第9期34卷 152-165页

作者： Zhiyuan Gao Wang Zheng Yanbin Li Yurong Liu Mengjie Wu Shouying Li Ping Li Guangliang Liu Xuewu Fu Shuxiao Wang Feiyue Wang Yong Cai Xinbin Feng Baohua Gu Huan Zhong Yongguang Yin Centre for Earth Observation Science and Department of Environment and GeographyUniversity of ManitobaWinnipegMB R3T 2N2Canada Institute of Surface-Earth System Science Tianjin UniversityTianjin 300192China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education and College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China State Key Laboratory of Agricultural Microbiology Huazhong Agricultural UniversityWuhan 430070China School of the Environment Nanjing UniversityState Key Laboratory of Pollution Control and Resource ReuseNanjing 210023China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Department of Chemistry and Biochemistry Florida International UniversityMiamiFL 33199USA School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China Environmental Sciences Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Environmental and Life Sciences Program(EnLS) Trent UniversityPeterboroughOntario K9L 0G2Canada Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

The transformation of mercury(Hg) in the environment plays a vital role in the cycling of Hg and its risk to the ecosystem and human health. Of particular importance are Hg oxidation/reduction and methylation/demethylation processes driven or mediated by the dynamics of light, microorganisms, and organic carbon, among others. Advances in understanding those Hg transformation processes determine our capacity of projecting and mitigating Hg risk. Here, we provide a critical analysis of major knowledge gaps in our understanding of Hg transformation in nature, with perspectives on approaches moving forward. Our analysis focuses on Hg transformation processes in the environment, as well as emerging methodology in exploring these processes. Future avenues for improving the understanding of Hg transformation processes to protect ecosystem and human health are also explored.

关键词： Mercury oxidation reduction methylation demethylation isotope fractionation

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Process intensification approach for design and optimization of biodiesel production from palm fatty acid distillate

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Biotechnology Reports 2021年 30卷 e00622页

作者： Im-orb, Karittha Arpornwichanop, Amornchai Simasatitkul, Lida Program in Food Process Engineering Faculty of Food - Industry King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Center of Excellence in Process and Energy Systems Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok 10330 Thailand Department of Industrial Chemistry Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok 10800 Thailand

Design of the biodiesel production from palm fatty acid distillate (PFAD) using process intensification approach is studied in technical, economic and environmental view points. Firstly, the transport phenomena analysis is performed to select the suitable intensified unit. The reactive distillation is selected and used in esterification – transesterification process and hydrolysis – esterification process. The optimum condition of reactive distillation in esterification – transesterification is achieved when the methanol is fed at the 3rd stage of the 4-stage column and the liquid holdup is maintained at 6 m³. The intensified esterification – transesterification process offers higher biodiesel yield and consumes less energy compared with the intensified hydrolysis – esterification process. The economic analysis shows that the intensified esterification-transesterification process is found to be economically feasible. Finally, environment assessment based on life cycle analysis (LCA) indicates that the environmental impact of both processes are similar. © 2021 The Author(s)

关键词： Biodiesel production Economic analysis and environmental analysis Palm fatty acid distillate Process design Process intensification

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Study of area change and rehabilitation of mangrove ecosystems in Karimunjawa National Park

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AIP Conference Proceedings 2023年第1期2683卷

作者： M. Arief Rahman Halim Tri Retnaningsih Soeprobowati Hadiyanto Hadiyanto Luri Nurlaila Syahid Master Program of Environmental Science School of Postgraduate Studies Universitas Diponegoro Semarang Indonesia Department of Biology Faculty of Science and Mathematics Universitas Diponegoro Semarang Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Semarang Indonesia Department of Geodesy and Geomatics Remote Sensing and Geographic Information Science Research Group Faculty of Earth Science and Technology Institut Teknologi Bandung Bandung Indonesia

The mangrove ecosystem is one of the unique and distinctive ecosystems because it is a compelling natural resource. However, in the current era, many people are greedy, resulting in the conversion of mangrove land, which causes a decrease in the area of the mangrove ecosystem. This study aims to determine changes in the extent of the mangrove ecosystem in Karimunjawa National Park and the appropriate rehabilitation efforts there. The method used in this research is a case study with descriptive analysis. Data collection techniques used literature studies from several related research sources whose research locations were in the Karimunjawa National Park. The collected data were then analyzed using the SWOT method. The main priority to be chosen as the primary strategic plan to repair damage and rehabilitate mangroves in Karimunjawa National Park is to establish synergistic cooperation between the implementation of government programs and the wishes of the local community through revitalizing coastal areas due to abrasion by replanting mangrove trees. This alternative strategy is a Strength-Threats (ST) strategy, where strength is maximized to overcome threats.

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Copper Nanodrugs by Atom Transfer Radical Polymerization

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Angewandte Chemie 2024年第20期136卷

作者： Peng Chen Ziyan Song Xuxia Yao Weibin Wang Lisong Teng Krzysztof Matyjaszewski Weipu Zhu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China The First Affiliated Hospital Department of Surgical Oncology Zhejiang University School of Medicine Hangzhou 310003 China Department of Chemistry Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000 China Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Hangzhou 310027 China

In this study, some copper catalysts used for atom transfer radical polymerization (ATRP) were explored as efficient anti-tumor agents. The aqueous solution of copper-containing nanoparticles with uniform spheric morphology was in situ prepared through a copper-catalyzed activator generated by electron transfer (AGET) ATRP in water. Nanoparticles were then directly injected into tumor-bearing mice for antitumor chemotherapy. The copper nanodrugs had prolonged blood circulation time and enhanced accumulation at tumor sites, thus showing potent antitumor activity. This work provides a novel strategy for precise and large-scale preparation of copper nanodrugs with high antitumor activity.

关键词： atom transfer radical polymerization miniemulsion polymerization nanodrugs copper complex anti-tumor

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Discontinuous metric programming in liquid crystalline elastomers

arXiv

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arXiv 2022年

作者： Hebner, Tayler S. Bowman, Riley G.A. Duffy, Daniel Mostajeran, Cyrus Griniasty, Itay Cohen, Itai Warner, Mark Bowman, Christopher N. White, Timothy J. Department of Chemical and Biological Engineering University of Colorado Boulder 596 UCB BoulderCO80309 United States Department of Engineering University of Cambridge CambridgeCB2 1PZ United Kingdom School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Laboratory of Atomic and Solid State Physics Cornell University IthacaNY14853-2501 United States Cavendish Laboratory University of Cambridge CambridgeCB3 0HE United Kingdom Materials Science and Engineering Program University of Colorado Boulder 596 UCB BoulderCO80309 United States

Liquid crystalline elastomers (LCEs) are shape-changing materials that exhibit large deformations in response to applied stimuli. Local control of the orientation of LCEs spatially directs the deformation of these materials to realize spontaneous shape change in response to stimuli. Prior approaches to shape programming in LCEs utilize patterning techniques that involve the detailed inscription of spatially varying nematic fields to produce sheets. These patterned sheets deform into elaborate geometries with complex Gaussian curvatures. Here, we present an alternative approach to realize shape-morphing in LCEs where spatial patterning of the crosslink density locally regulates the material deformation magnitude on either side of a prescribed interface curve. We also present a simple mathematical model describing the behavior of these materials. Further experiments coupled with the mathematical model demonstrate the control of the sign of Gaussian curvature, which is used in combination with heat transfer effects to design LCEs that self-clean as a result of temperature-dependent actuation properties. Copyright © 2022, The Authors. All rights reserved.

关键词： Gaussian distribution

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Novel fibrin-fibronectin matrix accelerates mice skin wound healing

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Bioactive Materials 2020年第4期5卷 949-962页

作者： Carlos Poblete Jara Ou Wang Thais Paulino do Prado Ayman Ismail Frank Marco Fabian Han Li Licio A.Velloso Mark A.Carlson William Burgess Yuguo Lei William H.Velander Eliana P.Araújo Nursing School University of CampinasCampinasSPBrazil Laboratory of Cell Signaling University of CampinasCampinasSPBrazil Department of Chemical and Biomolecular Engineering University of NebraskaLincolnNEUSA Biomedical Engineering Program University of NebraskaLincolnNEUSA School of Biological Science University of NebraskaLincolnNEUSA Department of Surgery University of Nebraska Medical Center and the VA Nebraska-Western Iowa Health Care SystemUSA Mary and Dick Holland Regenerative Medicine Program University of Nebraska Medical CenterOmahaNEUSA Fred&Pamela Buffett Cancer Center University of Nebraska Medical CenterOmahaNEUSA

Plasma fibrinogen(F1)and fibronectin(pFN)polymerize to form a fibrin clot that is both a hemostatic and provisional matrix for wound *** 90%of plasma F1 has a homodimeric pair ofγchains(γγF1),and 10%has a heterodimeric pair ofγand more acidicγ′chains(γγ′F1).We have synthesized a novel fibrin matrix exclusively from a 1:1(molar ratio)complex ofγγ′F1 and pFN in the presence of highly active thrombin and recombinant Factor XIII(rFXIIIa).In this matrix,the fibrin nanofibers were decorated with pFN nanoclusters(termedγγ′F1:pFN fibrin).In contrast,fibrin made from 1:1 mixture ofγγF1 and pFN formed a sporadic distribution of“pFN droplets”(termedγγF1+pFN fibrin).Theγγ′F1:pFN fibrin enhanced the adhesion of primary human umbilical vein endothelium cells(HUVECs)relative to theγγF1+FN *** dimensional(3D)culturing showed that theγγ′F1:pFN complex fibrin matrix enhanced the proliferation of both HUVECs and primary human *** in the 3Dγγ′F1:pFN fibrin exhibited a starkly enhanced vascular morphogenesis while an apoptotic growth profile was observed in theγγF1+pFN *** toγγF1+pFN fibrin,mouse dermal wounds that were sealed byγγ′F1:pFN fibrin exhibited accelerated and enhanced *** study suggests that a 3D pFN presentation on a fibrin matrix promotes wound healing.

关键词： Fibrin Fibronectin Nanoclusters Wound healing

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