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arXiv 2025年

作者： Gupta, Nitant Akepati, Sri V.V.R. Bianco, Simona Shah, Jay Adams, Dave J. Jayaraman, Arthi Department of Chemical and Biomolecular Engineering University of Delaware NewarkDE19716 United States Data Science Program University of Delaware NewarkDE19716 United States School of Chemistry University of Glasgow GlasgowG12 8QQ United Kingdom Department of Materials Science and Engineering University of Delaware NewarkDE19716 United States

In this paper, we extend a recently developed machine-learning (ML) based CREASE-2D method to analyze the entire two-dimensional (2D) scattering pattern obtained from small angle X-ray scattering measurements of supramolecular dipeptide micellar systems. Traditional analysis of such scattering data would involve use of approximate or incorrect analytical models to fit to azimuthally-averaged 1D scattering patterns that can miss the anisotropic arrangements. Analysis of the 2D scattering profiles of such micellar solutions using CREASE-2D allows us to understand both isotropic and anisotropic structural arrangements that are present in these systems of assembled dipeptides in water and in the presence of added solvents/salts. CREASE-2D outputs distributions of relevant structural features including ones that cannot be identified with existing analytical models (e.g., assembled tubes’ cross-sectional eccentricity, tortuosity, orientational order). The representative three-dimensional (3D) real-space structures for the optimized values of these structural features further facilitate visualization of the structures. Through this detailed interpretation of these 2D SAXS profiles we are able to characterize the shapes of the assembled tube structures as a function of dipeptide chemistry, solution conditions with varying salts and solvents, and relative concentrations of all components. This paper demonstrates how CREASE-2D analysis of entire SAXS profiles can provide an unprecedented level of understanding of structural arrangements which has not been possible through traditional analytical model fits to the 1D SAXS data. © 2025, CC BY-NC-SA.

关键词： X ray scattering

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chemical oxygen demand (COD) degradation of herbal, tofu and fertilizer wastewater using UV/Ozone oxidation methods 8

Chemical oxygen demand (COD) degradation of herbal, tofu and...

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8th International Seminar on New Paradigm and Innovation on Natural sciences and Its Application, ISNPINSA 2018

作者： Hadiyanto Silviana Padetya, N. Pratiwi, M.E. Aripratama, A.D. Chemical Engineering Department Faculty of Engineering Diponegoro University Indonesia Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Indonesia

The herbal, tofu and fertilizer industries contribute considerable waste. Unprocessed waste disposal can cause environmental pollution. The waste contains chemical oxygen demands (COD), and organic substances can be degraded by Advanced Oxidation Processes (AOPs) degradation method. The process of AOPs in this study used a combination of UV rays and ozone to produce hydroxyl radicals. This study was aimed to investigate the effect of UV, Ozone and UV-Ozone methods on COD degradation of herbal waste, tofu, and fertilizer. The result showed that the optimum degradation was obtained at experiment by using UV/ozone method. The COD degradation at tofu wastewater was from 1308 to 942 ppm, herbal wastewater was from 1011 to 414 ppm, and fertilizer wastewater was from 510 to 89 ppm by the use of 4 hours UV-Ozone method. © Published under licence by IOP Publishing Ltd.

关键词： chemical oxygen demand

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A Topology-Defined Polyester Elastomer from CO2and 1,3-Butadiene: A One-Pot-One-Step “Scrambling Polymerizations” Strategy

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Angewandte Chemie 2022年第46期134卷

作者： Kaihao Chen Zhiqi Zhu Dr. Tianwen Bai Yixuan Mei Tianlun Shen Prof. Jun Ling Prof. Xufeng Ni MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China College of Biological Chemical Sciences and Engineering Jiaxing University Jiaxing 314001 China

It is significant and challenging to use CO 2 to produce polymeric materials, especially with olefins. Here, a novel strategy named “scrambling polymerizations” is designed and performed for the copolymerization of a CO 2 -and-1,3-butadiene-derived valerolactone, 3-ethylidene-6-vinyltetrahydro-2H-pyran-2-one (EVL), with ϵ-caprolactone (CL) to prepare polyesters. Anionic ring-opening polymerization of CL and conjugated addition oligomerization of EVL take place individually to form PCL and EVL oligomers, respectively. Then EVL oligomers insert into PCL by transesterification resulting in polyester P(CL-co-EVL) with a tunable topology and composition. The non-cytotoxic and degradable polyester network with elongation at break of >600 % can be used as an elastomer. We propose a method to provide polyester elastomers from CO 2 and olefins for the first time, and expand the potential of transformation from sustainable feedstocks to polymeric materials.

关键词： Carbon Dioxide Fixation Copolymerization Polyester Elastomer Ring-Opening Polymerization

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Synthetic hydrogel culture sequesters extracellular matrix proteins and promotes fibroblast proliferation 42

Synthetic hydrogel culture sequesters extracellular matrix p...

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42nd Society for Biomaterials Annual Meeting and Exposition 2019: The Pinnacle of Biomaterials Innovation and Excellence

作者： Kopyeva, Irina Tomaszewski, Claire E. Shikanov, Ariella Department of Chemical Engineering University of Michigan Ann ��ArborMI United States Department of Biomedical Engineering University of Michigan Ann ��ArborMI United States Department of Macromolecular Science and Engineering University of Michigan Ann ��ArborMI United States

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Reconstructing the ovarian microenvironment: Culturing follicles in an ecm-sequestering peg matrix 42

Reconstructing the ovarian microenvironment: Culturing folli...

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42nd Society for Biomaterials Annual Meeting and Exposition 2019: The Pinnacle of Biomaterials Innovation and Excellence

作者： Tomaszewski, Claire E. Kopyeva, Irina Shikanov, Ariella Department of Biomedical Engineering University of Michigan Ann ArborMI United States Department of Chemical Engineering University of Michigan Ann ArborMI United States Department of Macromolecular Science and Engineering University of Michigan Ann ArborMI United States

ISBN: (纸本)9781510883901

Statement of Purpose: Extracellular matrix (ECM) is a key component of a biological microenvironment and is an important regulator of signal transduction relating to survival, proliferation, cell signaling, migration, and steroidogenesis. ECM molecules including proteins, proteoglycans, and polysaccharides are secreted by cells and assemble to form complex structures which can be degraded and rebuilt. In the ovary, ECM has both structural and biological function. Follicles have a basal lamina composed primarily of collagen IV and laminin which separates the theca interna from the granulosa cells. This basement membrane is continuously remodeled as the granulosa cells proliferate, and controls diffusion of molecules in and out of the follicular fluid. Additionally, growth factors bind directly to ECM, or may adhere through binding proteins or follistatin, and are subsequently released upon ECM degradation for use by the follicle. Current in vitro follicle culture systems use biomaterials such as alginate to yield fertilizable oocytes for preserving fertility in women facing premature ovarian failure as a consequence of chemotherapy treatment or other reproductive pathologies, but these systems are unable to retain ECM, and therefore biological activity. Contrary to alginate, poly-ethylene glycol (PEG) is a biocompatible synthetic polymer with tunable physical properties and biological activity, such as sensitivity to cell-secreted proteases, and can be functionalized with ECM-sequestering sequences to retain cell-secreted ECM. In this report, we investigated the culture of mouse secondary ovarian follicles (125-135 μm) in a biomimetic ECM-sequestering PEG matrix. © 2019 Omnipress - All rights reserved.

关键词： Cell signaling

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Metal-Backboned Polymers with Well-Defined Lengths

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Angewandte Chemie 2023年第10期135卷

作者： Kaiwen Zeng Yibei Yang Jianing Xu Ning Wang Weiqiang Tang Jianchen Xu Yifeng Zhang Yanruzhen Wu Prof. Yifei Xu Prof. Guowei Wang Prof. Peining Chen Prof. Bingjie Wang Prof. Xuemei Sun Prof. Guoxin Jin Prof. Huisheng Peng Laboratory of Advanced Materials State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200438 P. R. China School of Chemical Engineering State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Molecular Engineering of Polymers Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of Chemistry Fudan University Shanghai 200438 P. R. China

Constructing the backbones of polymers with metal atoms is an attractive strategy to develop new functional polymeric materials, but it has yet to be studied due to synthetic challenges. Here, metal atoms are interconnected as the backbones of polymers to yield metal-backboned polymers (MBPs). Rational design of multidentate ligands synthesized via an efficient iterative approach leads to the successful construction of a series of nickel-backboned polymers (NBPs) with well-defined lengths and up to 21 nickel atoms, whose structures are systematically confirmed. These NBPs exhibit strong and length-depended absorption with narrow band gaps, offering promising applications in optoelectronic devices and semiconductors. We also demonstrate the high thermal stability and solution processsability of such nickel-backboned polymers. Our results represent a new opportunity to design and synthesize a variety of new metal-backboned polymers for promising applications in the future.

关键词： Metal Backbone Nickel Polymers Poly(Aminopyridine)S

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Dynamic windows based on reversible silver electrodeposition with improved resting stability and cyclability

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Cell Reports Physical science 2025年第5期6卷

作者： Cai, Yuchun Li, Ziliang Hernandez, Tyler S. McAndrews, Gabriel R. Wu, Yihan Barile, Christopher J. McGehee, Michael D. Department of Chemical and Biological Engineering University of Colorado Boulder 4001 Discovery Drive Boulder 80303 CO United States Department of Chemistry University of Colorado Boulder 1606 Central Campus Mall Boulder 80309 CO United States Renewable and Sustainable Energy Institute University of Colorado Boulder 4001 Discovery Drive Boulder 80303 CO United States Tynt Technologies Inc. Court Boulder 80301 CO United States Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive Boulder 80303 CO United States Department of Chemistry University of Nevada Reno 1664 N. Virginia Street Reno 89557 NV United States

Dynamic windows using reversible metal electrodeposition (RME) enhance the energy efficiency of buildings and control glare. Ag is competitive due to its single-electron reduction and high extinction coefficient. However, achieving both >24 h resting stability and >1,000 cycles is challenging. Here, we develop Ag-dimethyl sulfoxide (DMSO) windows enabling high optical contrast (∼75% clear-state and <0.1% dark-state transmission). While Cu promotes cyclability, Cu²⁺ dissolves Ag films within 30 min in the dark state. Additionally, O₂ chemically dissolves Ag films in the presence of Br⁻. Without Cu, Ag windows cannot cycle >100 times because of Ag₂O or AgOH formation. We introduce trifluoroacetic acid (TFA) into the electrolyte to prevent residue formation, enabling consistent optical properties over 7,500 cycles. We demonstrate that Ag films maintain <0.1% dark-state transmission for 80 days with a Cu-free electrolyte in the O₂-free glovebox, and the device stays at <1% transmission for 24 h on the benchtop. © 2025 The Authors

关键词： dynamic windows electrochemistry light modulation resting stability reversible metal electrodeposition silver electrodeposition transparent metal mesh

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Controlled synthetic chirality in macroscopic assemblies of carbon nanotubes

arXiv

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arXiv 2023年

作者： Doumani, Jacques Lou, Minhan Dewey, Oliver Hong, Nina Fan, Jichao Baydin, Andrey Yomogida, Yohei Yanagi, Kazuhiro Pasquali, Matteo Saito, Riichiro Kono, Junichiro Gao, Weilu Department of Electrical and Computer Engineering Rice University HoustonTX United States Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX United States Department of Electrical and Computer Engineering The University of Utah Salt Lake CityUT United States Carbon Hub Rice University HoustonTX United States Department of Chemical and Biomolecular Engineering Rice University HoustonTX United States J.A. Woollam Co. Inc. LincolnNE United States Smalley–Curl Institute Rice University HoustonTX United States Department of Physics Tokyo Metropolitan University Tokyo Japan Department of Chemistry Rice University HoustonTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States Department of Physics Tohoku University Sendai Japan Department Physics and Astronomy Rice University HoustonTX United States

There is an emerging recognition that successful utilization of chiral degrees of freedom can bring new scientific and technological opportunities to diverse research areas. Hence, methods are being sought for creating artificial matter with controllable chirality in an uncomplicated and reproducible manner. Here, we report the development of two straightforward methods for fabricating wafer-scale chiral architectures of ordered carbon nanotubes (CNTs) with tunable and giant circular dichroism (CD). Both methods employ simple approaches, (i) mechanical rotation and (ii) twist-stacking, based on controlled vacuum filtration and do not involve any sophisticated nanofabrication processes. We used a racemic mixture of CNTs as the starting material, so the intrinsic chirality of chiral CNTs is not responsible for the observed chirality. In particular, by controlling the stacking angle and handedness in (ii), we were able to maximize the CD response and achieve a record-high deep-ultraviolet ellipticity of 40 ± 1 mdeg/nm. Our theoretical simulations using the transfer matrix method reproduce the salient features of the experimentally observed CD spectra and further predict that a film of twist-stacked CNTs with an optimized thickness will exhibit an ellipticity as high as 150 mdeg/nm. The created wafer-scale objects represent a new class of synthetic chiral matter consisting of ordered quantum wires whose macroscopic properties are governed by nanoscopic electronic signatures such as van Hove singularities. These artificial structures with engineered chirality will not only provide playgrounds for uncovering new chiral phenomena but also open up new opportunities for developing high-performance chiral photonic and optoelectronic devices. © 2023, CC BY.

关键词： Carbon nanotubes

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Outside Front Cover: Plasma Process. Polym. 1/2022

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Plasma Processes and Polymers 2022年第1期19卷

作者： Jonas Drewes Suren Ali-Ogly Thomas Strunskus Oleksandr Polonskyi Hynek Biederman Franz Faupel Alexander Vahl Chair of Multicomponent Materials Institute of Materials Science Faculty of Engineering Kiel University Kiel Germany Department of Macromolecular Physics Charles University Prague Czech Republic Department of Chemical Engineering Engineering II University of California Santa Barbara California USA

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Solvent-Free Synthesis of the Polymer Electrolyte via Photo-Controlled Radical Polymerization: Toward Ultrafast In-Built Fabrication of Solid-State Batteries under Visible Light

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ACS applied materials & interfaces 2021年第7期13卷 8426-8434页

作者： Peng Wen Yucheng Zhao Zongtao Wang Jun Lin Mao Chen Xinrong Lin Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China. State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 P. R. China.

Thin solid polymer electrolytes (SPEs) with good processability, improved room-temperature ionic conductivity, and better interfacial compatibility are urgently needed to develop solid-state batteries without safety and leakage issues. In-built electrolyte polymerization has emerged as a novel and effective platform to obtain such electrolytes. However, existing in-built methods usually involve heat, UV, γ irradiation, and so forth to initiate the polymerization and often require the addition of solvents to avoid the concentrated active propagating species, which inevitably afford solvent residues that persist in the electrolyte matrix, leading to complex SPE preparation processes, safety hazards, and side reactions with the electrodes. Herein, a simple solvent-free preparation of the poly(mPEGAA)-based electrolyte film was achieved via the photo-controlled radical polymerization under visible light irradiation via an in-built manner, which resulted in 99% monomer conversion within 5 min to obtain the polymer electrolytes with a controlled molecular weight distribution. Thanks to the mild and green conditions, a thin, solvent-free, and cross-linked SPE electrolyte film was obtained efficiently yet in a well-regulated manner, which gave rise to good interfacial compatibility and an improved room-temperature ionic conductivity of 1.5 × 10 S cm at 25 °C. As-prepared solid-state LiFePO|Li batteries based on the in-built thin SPE exhibited a high discharge areal capacity of 1.7 mA h cm (164.6 mA h g) at an ambient temperature. Furthermore, the system displayed lithium dendrite suppression behavior and good long-term charge-discharge cycling in the Li symmetric battery for over 270 h, representing enhanced stability and capacities compared with ex-built systems.

关键词： in-built polymer electrolyte photo-controlled radical polymerization solid-state batteries solvent-free visible light

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