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Electrostatic Self-Assembly Approach to Fabricate Architectures of Carboxyl Functionalized Gold-Aryl Nanoparticles and Graphene Oxide Platforms

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SSRN 2021年

作者： Parambath, Javad B.M. Arooj, Mahreen Omastova, Maria Chehimi, Mohamed M. Kim, Sanghyun Han, Changseok Mohamed, Ahmed A. Department of Chemistry College of Sciences University of Sharjah Sharjah27272 United Arab Emirates Univ Paris Est Creteil CNRS ICMPE UMR7182 ThiaisF-94320 France Program in Environmental & Polymer Engineering Graduate School INHA University 22212 Korea Republic of Department of Environmental Engineering INHA University 22212 Korea Republic of

Graphene oxide (GO) was decorated with gold-aryl (Au-C) nanoparticles AuNPs-COOH by sodium borohydride reduction of aryldiazonium tetrachloroaurate(III) salt at room temperature in aqueous solutions. Brunauer-Emmett-Teller measurements supported GO anchoring by AuNPs modified with COOH;surface area dropped significantly. Morphology of AuNPs-COOH/GO nanocomposite (NC) was probed using AFM and TEM, showing NC’s surface roughness and wrinkling. XPS results suggest the clear reductive reaction of tetrachloroaurate anion into metallic gold in AuNPs-COOH/GO along with detailed interpretations of functional groups’ nature. Molecular dynamics calculations endowed support of favorable wrinkling at the edges and carboxyl intercalation to GO surface of types π- π, hydrogen bonding, and hydrophobic interactions. Solvent accessible surface area calculations of GO showed a decrease in total surface area. environmental nanoremediation of the catalytic reduction of 4-nitrophenol, a priority pollutant listed by USEPA, was investigated. The apparent rate constants Kapp of four catalytic reduction cycles of nitrophenol were measured. The highest value is 1.17 × 10-1 min-1 for the first cycle which decreased to 4.49 × 10 -2 min -1 for the fourth cycle. The variations in rate constants were measured with different conditions, including NaBH 4 concentrations, NC loadings and NC incubating time in NaBH4. © 2021, The Authors. All rights reserved.

关键词： Molecular dynamics

Surface Self-Assembled Multi-Level Nife-Ldhs Integrated Super-Hydrophilic Diaphragms Enabling Efficient Alkaline Water Electrolysis for High Current Density and Durability

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SSRN 2025年

作者： Luo, Xi Yang, Xiaohui Zhou, Yongnan Xu, Nengneng Yang, Nianjun Zhang, Quan Liu, Yuyu Kolokolov, Daniil I. Qiao, Jinli State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Environmental Science and Engineering Donghua University 2999 Ren’min North Road Shanghai201620 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Chemistry & IMO-IMOMEC Hasselt University Diepenbeek3590 Belgium Institute for Sustainable Energy College of Sciences Shanghai University Shanghai200444 China Boreskov Institute of Catalysis SB RAS Novosibirsk State University 630090 Russia Yancheng Institute of Technology China

Alkaline water electrolysis is one of most potential techniques for green hydrogen production, offering high energy conversion and storage. High current density and durability diaphragms are crucial for electrochemical performance. Here we have developed a high-performance composite diaphragm based on in-situ self-assemble of nickel-iron layered double hydroxides (NiFe-LDHs) loaded on Zirfon-type substrate, and at the same time catalytic NiFe-LDHs integrated the anode side for high-performance alkaline water electrolysis. By modulating the microstructure, a unique surficial feature with high surface free energy and super-hydrophilicity to address the issue of high ohmic resistance is established and achieves rapid OH−conduction and high catalytic oxygen evolution reaction (OER). Consequently, the prepared ZLDH-χ series diaphragm affords excellent application properties, with ZLDH-10 diaphragm an ultra-short wetting time of 0.23s and a reduction of 120 mV over-voltage in single electrolytic cell. Electrolyzer with ZLDH-10 diaphragm provides exceptional current density of 1400 mA cm-2 at 2.0 V in 80oC 30wt% KOH. Importantly, large-scale ZLDH-10 diaphragm with 37 × 37 cm2 can be readily made and reaches an unprecedented durability at 1000 mA cm-2@1.8 V over 240 hours. Both simple in-situ self-assemble approach and excellent performance of ZLDH-χ series diaphragm pave a new way for manufacturing diaphragm in advanced alkaline water electrolysis. A partial polarization method was first invented to figure out the contribution ratio for cell voltage reduction between NiFe-LDHs catalytic effect and hydrophilic improving effect. © 2025, The Authors. All rights reserved.

关键词： Potassium hydroxide

Stepwise construction of Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and magnetic separability for efficient visible-light photocatalysis

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Chinese Chemical Letters 2020年第6期31卷 1598-1602页

作者： Zhijian Li Yao Wang Ahmed A.Elzatahry Xuanyu Yang Shouzhi Pu Wei Luo Xiaowei Cheng Yonghui Deng Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEMFudan University.Shanghai 200433China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China Materials Science and Technology Program College of Arts and SciencesQatar UniversityDoha PO Box 2713Qatar State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Solid photocatalysts with high specific surface area,superior photoactivity and ease of recycling are highly desired in chemical process,water treatment and so *** this study,a facile stepwise sol-gel coating approach was utilized to synthesize Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and convenient magnetic separability(denoted as Fe3 O4@-SiO2@Pt/mTiO2-x).These photocatalysts consist of magnetic Fe3 O4 cores,nonporous insulating SiO2 middle layer and mesoporous anatase TiO2-x shell decorated by Pt nanoparticles(~3.5 nm)through wet impregnation and H2 *** a result of high activity of oxygen-deficiency of black TiO2-x by H2 reduction and efficient inhibition of electron-hole recombination by Pt nanoparticles,the rationally designed core-shell Fe3 O4@SiO2@Pt/mTiO2-x photocatalysts exhibit superior photocatalytic performance in rhodamine B(RhB)degradation under visible light irradiation,with more than 98%of RhB degraded within 50 *** core-shell structured photocatalysts show excellent recyclability under the assistance of magnetic separation with well-retained photocatalytic performance even after running five *** stepwise synthesis method paves the way for the rational design of a high-efficiency recyclable heterogeneous catalyst,including photocatalysts,for various applications.

关键词： Core-shell Mesoporous TiO2 Photocatalytic activity Magnetic recovery Visible light

Demystifying Low-Carbon Materials

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Materials Circular Economy 2021年第1期3卷 1-11页

作者： Das, Oisik Restás, Ágoston Shanmugam, Vigneshwaran Sas, Gabriel Försth, Michael Xu, Qiang Jiang, Lin Hedenqvist, Mikael S. Ramakrishna, Seeram Structural and Fire Engineering Division Department of Civil Environmental and Natural Resources Engineering Luleå University of Technology Luleå Sweden Department of Fire Protection and Rescue Control National University of Public Service Budapest Hungary Faculty of Mechanical Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China Department of Fibre and Polymer Technology Polymeric Materials Division School of Engineering Sciences in Chemistry Biotechnology and Health KTH Royal Institute of Technology Stockholm Sweden Department of Mechanical Engineering National University of Singapore Singapore Singapore

Low-carbon materials (the ‘carbon’ is related to carbon dioxide emission potential and not elemental carbon) need to be developed and embraced ubiquitously for the sustainable development of human society and mitigate climate change. In the absence of clear consensus in the literature coupled with the presence of certain miss-information, this ‘discussion’ article seeks to define low-carbon materials as the materials that foster a healthy living environment and a circular economy via the elimination or reduction of associated greenhouse gas (GHG) emissions and resource depletion and wastage. Furthermore, the multidimensional facets of low-carbon products and services are described to promote widespread utilisation of low-carbon materials so as to transition to desired low-carbon or decarbonised economies. Several specific strategies for realising the aforementioned are illustrated, which include radical green chemistry and materials approach, efficient materials extraction and processing, utilising renewable feedstocks and energies, efficient product manufacturing, enhanced recycling rates, designing out wastes, circular flow of materials, and innovative business models. The information provided in this ‘discussion’ article strives to outline a variety of aspects and tools available and necessary to accelerate the growth of low-carbon materials and progress towards a sustainable future. The integration of low-carbon materials, products and services with natural resource preservation, prosperity and a healthy living environment

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Biodegradable and Hydrophobic Nanofibrous Membranes Produced by Solution Blow Spinning for Efficient Oil/Water Separation

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SSRN 2022年

作者： Bang, Junsik Park, Subong Hwang, Sung-Wook Oh, Jung-Kwon Yeo, Hwanmyeong Jin, Hyoung-Joon Kwak, Hyo Won Department of Agriculture Forestry and Bioresources College of Agriculture & Life Sciences Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Fisheries Engineering Division National Institute of Fisheries Science Busan46083 Korea Republic of Research Institute of Agriculture and Life Sciences Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Program in Environmental and Polymer Engineering Inha University 100 Inha-ro Namgu Incheon22212 Korea Republic of

The development of nanofibrous oil-water separation materials is explosively progressing, but the remarkably low productivity is the main factor hindering their practical application. In this study, biodegradable polybutylene succinate (PBS) nanofibers with excellent productivity (27.0 g/h per nozzle) were successfully fabricated using the solution blow spinning (SBS) process, breaking away from the conventional electrospinning method. The prepared PBS nanofibers exhibited extremely thin fiber diameters (130 nm) with high porosity (97.4%). Without any chemical modification or inorganic/organic hybrid materialization, the PBS nanofibrous membrane showed excellent oil adsorption capacity (minimum: 18.7 g/g and maximum: 38.5 g/g) and separation efficiency;water and oil mixtures (99.4 - 99.98%) and emulsions (98.1 - 99.5%) compared to conventional organic polymer-based nanofibers. In terms of disposal after use, this biodegradable nanofibrous membrane was able to return to nature through hydrolysis and biodegradation processes. © 2022, The Authors. All rights reserved.

关键词： Nanofibers

The CNC dispersion quality in various PLA grades

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AIP Conference Proceedings 2023年第1期2607卷

作者： Emre Vatansever Dogan Arslan Deniz Sema Sarul Mohammadreza Nofar Polymer Science and Technology Program Istanbul Technical University Maslak Istanbul 34469 Turkey Metallurgical & Materials Engineering Department Faculty of Chemical and Metallurgical Engineering Istanbul Technical University Maslak Istanbul 34469 Turkey

In this study, the effect of molecular weight and crystallizability of PLA matrix on the PLA/CNC nanocomposite morphology was systematically investigated using rheological experiments. PLA/CNC nanocomposites containing 1, 3, 5, 7, and 10 wt% of CNC were prepared using solution casting method. The comparison of the effect of PLA molecular weight indicated that CNC could form a percolation network at lower contents when low molecular weight PLA was used as the matrix. This finding attributed to the easier interpenetration of shorter PLA chains and CNC nanoparticles in the solvent. On the other hand, it was observed that the use of PLA with higher crystallizability caused further reduction of the onset of CNC percolation network concentrations. This was because during the solvent evaporation step, which was at around 85°C, the isothermal cold crystallization of PLA around the dispersed CNCs could become more favorable and thereby the heterogeneous crystal nucleation could prevent the driving force of the CNCs towards aggregation.

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Uv Light Causes Structural Changes in Microplastics Exposed in Biosolids

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SSRN 2022年

作者： Alavian Petroody, Somayye Sadat Hashemi, Seyed Hossein Škrlep, Luka Sever Škapin, Andrijana van Gestel, Cornelis A.M. Environmental Sciences Research Institute Shahid Beheshti University Tehran Iran Slovenian National Building Civil Engineering Institute Dimičeva ulica 12 Ljubljana1000 Slovenia Faculty of Polymer Technology - FTPO Ozare 19 Slovenj Gradec2380 Slovenia Department of Ecological Science Faculty of Science Vrije Universiteit Amsterdam De Boelelaan 1085 Amsterdam1081 HV Netherlands

Biosolids (biological sludge) from wastewater treatment plants are an important source of microplastics (MPs) emission into the environment. Weakening the MP structure before their entering the environment may accelerate their degradation and reduce potential environmental exposure. We therefore studied the effect of UV-A and UV-C, applied at 70°C, on three types of MPs, polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), commonly found in sewage sludge, using three shapes (fibers, lines, granules). The MPs were exposed to UV radiation in biosolids suspensions, and in air and in water as control. Structural changes and degradation of the MPs were investigated using Attenuated Total Reflectance - Fourier Transform Infrared Spectrometry (ATR-FTIR). UV exposure led to the emergence of carbonyl and hydroxyl groups in all PP samples. In PE and PET these groups were formed only in the biosolids suspensions. The presence of carbonyl and hydroxyl groups increased with increasing exposure time. Overall, UV radiation had the greatest impact on the MPs in the biosolids suspension, probably due to the presence of organic matter and its water content. Fibers were more degraded than the other two plastic shapes, probably due to their higher surface-to-volume ratio. UV-A was slightly more effective in degrading the MPs than UV-C. These findings show that ultraviolet radiation in combination with an elevated temperature affects the structure of polymers in wastewater biosolids which can accelerate their degradation after entering the environment. © 2022, The Authors. All rights reserved.

关键词： Ultraviolet radiation

Interfacial Cavitation

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arXiv

arXiv 2022年

作者： Henzel, Thomas Nijjer, Japinder Senthilnathan, Chockalingam Wahdat, Hares Crosby, Alfred J. Yan, Jing Cohen, Tal Department of Civil and Environmental Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Molecular Cellular and Developmental Biology Yale University New HavenCT06520 United States Department of Aeronautics and Astronautics Massachusetts Institute of Technology CambridgeMA02139 United States Polymer Science and Engineering Department University of Massachusetts Amherst AmherstMA01003 United States Quantitative biology Institute Yale New HavenCT06520 United States Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Besant

Cavitation has long been recognized as a crucial predictor, or precursor, to the ultimate failure of various materials, ranging from ductile metals to soft and biological materials. Traditionally, cavitation in solids is defined as an unstable expansion of a void or a defect within a material. The critical applied load needed to trigger this instability - the critical pressure - is a lengthscale independent material property and has been predicted by numerous theoretical studies for a breadth of constitutive models. While these studies usually assume that cavitation initiates from defects in the bulk of an otherwise homogeneous medium, an alternative and potentially more ubiquitous scenario can occur if the defects are found at interfaces between two distinct media within the body. Such interfaces are becoming increasingly common in modern materials with the use of multi-material composites and layer-by-layer additive manufacturing methods. However, a criterion to determine the threshold for interfacial failure, in analogy to the bulk cavitation limit, has yet to be reported. In this work we fill this gap. Our theoretical model captures a lengthscale independent limit for interfacial cavitation, and is shown to agree with our observations at two distinct lengthscales, via two different experimental systems. To further understand the competition between the two cavitation modes (bulk versus interface) we expand our investigation beyond the elastic response to understand the ensuing unstable propagation of delamination at the interface. A phase diagram summarizes these results, showing regimes in which interfacial failure becomes the dominant mechanism. © 2022, CC BY-NC-ND.

关键词： Cavitation

Author Correction: AI-assisted discovery of high-temperature dielectrics for energy storage

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Nature communications 2024年第1期15卷 7168页

作者： Rishi Gurnani Stuti Shukla Deepak Kamal Chao Wu Jing Hao Christopher Kuenneth Pritish Aklujkar Ashish Khomane Robert Daniels Ajinkya A Deshmukh Yang Cao Gregory Sotzing Rampi Ramprasad School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA USA. Polymer Program Institute of Materials Science University of Connecticut Storrs 06296 CT USA. Materials Science Program Institute of Materials Science University of Connecticut Storrs CT USA. Electrical Insulation Research Center Institute of Materials Science University of Connecticut Storrs CT USA. Department of Electrical Engineering Tsinghua University Beijing China. Faculty of Engineering Science University of Bayreuth Bayreuth Germany. Polymer Program Institute of Materials Science University of Connecticut Storrs CT USA. School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA USA. rampi.ramprasad@mse.gatech.edu.