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MXene:From synthesis to environment remediation

Chinese Journal of chemical engineering 2023年第9期61卷 260-280页

作者： Ali Nikkhah Hasan Nikkhah Hadis langari Alireza Nouri Abdul Wahab Mohammad Ang Wei Lun Ng law Yong Rosiah Rohani Ebrahim Mahmoudi Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi 43600Malaysia Department of Mechanical and Aerospace Engineering University at BuffaloBuffaloUSA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsUSA Department of Chemistry and Medicinal Chemistry University at BuffaloBuffaloUSA Chemical and Water Desalination Engineering Program College of EngineeringUniversity of SharjahSharjah 27272United Arab Emirates Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai LongKajangSelangorMalaysia

A new burgeoning family of two-dimensional(2D)transition metal carbides/nitrides,better known as MXenes,have received extensive attention because of their distinct properties,such as metallic conductivity,good hydrophilicity,large surface area,good mechanical stability,and *** 40 different MXenes have been synthesized,and dozens more structures and properties have been theoretically ***,the recent progress in MXenes development is not well covered in chronological order based on different *** review article focuses on emerging synthesis methods,the properties of MXenes,and mainly the applications of MXenes and MXene-based material family in environmental remediation,a comprehensive review of gaseous and aqueous pollutants treatment.

关键词： MXene 2D materials Wastewater treatment CO_(2)capture Adsorption Photodegradation

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Measuring surface energy of solid surfaces using centrifugal adhesion balance

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Physical Review E 2024年第1期110卷 014801-014801页

作者： Appu Vinod Yuval Barak Sakshi Yadav Schmid Semih Gulec Yagnavalkya Bhimavarapu Akash Jena David Katoshevski Nitsa Haikin Rafael Tadmor Department of Mechanical Engineering Materials Transformation Material Science and Engineering Dan F. Smith Department of Chemical Engineering Department of Physics

The standard way to evaluate the solid surface energy using probe liquids relies on contact angle measurements. The measured contact angles rely on visible means and are different from their nanoscopic thermodynamic values. This compromises the surface-energy predictions so much that the surface energy-values can be hundreds of percentages higher than expected based on comparisons with different methods as reported in several studies. We consider the Owen-Wendt approach, which breaks the surface energy to polar and dispersive components, and present a technique for measuring surface energy of solids using probe liquids. Our method avoids the need to measure contact angles; instead, it uses solid-liquid work of adhesion measurements which are performed using a centrifugal adhesion balance. In agreement with the studies mentioned above, we found that indeed, the surface energies of the measured solids are significantly lower than those based on contact angle measurements. More importantly we found that our method results in a reasonable breakdown of the surface energy to polar and dispersive components with a higher polar component for more polar solids. This is in contrast with the surface energy based on contact angle measurements for which the breakdown did not make sense, i.e., the measurements reflected higher polar components of the surface energy for less polar solids.

关键词： Adhesives Coatings

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Site difference influence of anchored Ru in mesoporous carbon on electrocatalytic performance toward pH-universal hydrogen evolution reaction

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Rare Metals 2023年第12期42卷 4015-4028页

作者： Xiao-Fang Ma He Xiao Yan-Ying Jing Yang Gao Ying-Luo He Man Zhao Jian-Feng Jia Hai-Shun Wu Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030032China Department of Applied Chemistry School of EngineeringUniversity of ToyamaToyama 930-8555Japan

Ru-based electrocatalysts have demonstrated excellent electrocatalytic performance toward hydrogen evolution reaction(HER).However,designing Ru nanoparticles/nanoclusters(Ru NPs/NCs)with abundant accessible active sites is ***,a selective facile hydrothermal in situ polymerization strategy is described to accurately control the anchoring point of Ru in hollow mesoporous carbon spheres(HMCs)(outer surface,HMCs@Ru;cavity,Ru@HMCs;and pore channels,Ru/SHMCs).The HER mechanisms of the three catalysts over a wide pH range were revealed by analyzing the loading position,content,dispersion,particle size,and valence state of ***@Ru shows excellent area activity,with overpotentials of 64.3,2.8,and 78.1 mV at 10 mA·cm^(-2)in0.5 mol·L^(-1)H_(2)SO_(4),1 mol·L^(-1)KOH;and 0.5 mol·L^(-1)phosphate buffer saline(PBS)solutions,***/S-HMCs exhibit high mass activity,with values 43.3,2.9,and 12.7 times those of Pt/C in alkaline,acidic,and neutral media,respectively,at-50 mV(*** hydrogen electrode(RHE)).After 2000 cyclic voltammetry cycles,the performances of HMCs@Ru and Ru/S-HMCs hardly decrease,indicating good *** excellent electrocatalytic activity can be attributed to two main factors:(1)the confinement effect,which not only promotes high Ru dispersion but also prevents the leaching of active metal under harsh conditions,and(2)their excellent structural *** catalyst structure features a large hollow located in the center(~160 nm in diameter)and an ultrathin monolayer of mesopores(~6 nm)uniformly distributed on the hollow shells,ensuring fast mass diffusion and electron transfer kinetics,as well as complete accessibility of catalytic sites.

关键词： Confinement effect Ru Monolayer hollow mesoporous carbon(HMC) Hydrogen evolution reaction(HER)

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Smartly tuning supramolecular chirality in polymer gels via photoexcitation-induced cooperative self-assembly

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science China Chemistry 2025年第3期68卷 1126-1135页

作者： Bingbing Yue Yulong Shi Fan Yang Danfeng Ye Jian Jin Pilan Zhang Shen Song Yifei Xu Hui Lin Shihui Zhu Liangliang Zhu School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China College of Material Science and Chemical Engineering Ningbo University of TechnologyNingbo 315211China Shanghai Depeac Biotechnology Co. Ltd.Shanghai 201900China Burn and Plastic Surgery Department Children’s Medical Center Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200120China

Although supramolecular chirality tuning is prosperous in systems with small molecular building blocks,these systems lack structural strength and have limited practical ***,polymer systems do not exhibit these drawbacks but suffer from topological chain entanglement,which often leads to large dynamic obstacles and therefore limits the tunability of supramolecular ***,we report that by manipulating stoichiometry and employing light to alter the H-bond crosslinking between a photoexcitation-induced aggregatable molecule and high molecular weight poly(L-lactic acids),supramolecular chirality tuning of the polymer gel systems can be achieved in different ways through a cooperative ***,the Cotton effects of the examined systems can be negatively tuned by varying their stoichiometry,while positive tuning can be realized by *** deexcitation,negative Cotton effect tuning occurs again spontaneously in some *** supramolecular chirality tuning is accompanied by rheological property tuning,demonstrating that our strategy can overcome polymer chain entanglement *** proposed strategy inspires further works on the precise control of polymer chirality and,hence,development of asymmetric materials with changeable optical activity and modulus.

关键词： supramolecular chirality polymer gels phototuning self-assembly rheological property

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A cross-scale characterization of porous rocks altered by flow and dissolution 58

A cross-scale characterization of porous rocks altered by fl...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Xu, Z. Li, W. Kolanti, A. Sprouster, D. Department of Civil Engineering Stony Brook University Stony BrookNY United States Department of Material Science and Chemical Engineering Stony Brook University Stony BrookNY United States

ISBN: (纸本)9798331305086

Flow and dissolution induce wormholes in porous rocks, which lead to a substantial increase in both permeability and flow heterogeneity of the rock formation. Wormholes originate from the initial micron-scale pore networks, and gradually transition to more prominent millimeter-scale holes. Wormholes have a crucial impact on the flow and reactions in subsurface technologies, such as critical mineral leaching, CO2 storage and reservoir stimulation. Understanding how wormholes form from pore networks is crucial for the effectiveness of these subsurface technologies. However, current studies are limited to two separate scales of characterizations: millimeter-scale wormholes and micron-scale pore networks. The transitional region, which bridges these features at the two scales, remains largely unexplored and inadequately characterized. This knowledge gap obscures our understanding of the underpinning physics that governs wormhole formation in porous rocks. In this study, we aim to bridge these two scales of study with multiscale characterization. We create wormholes in porous gypsum specimens through core flood tests. The wormholes are then scanned with low-resolution (26.70 µm) and high-resolution (3.43 µm) X-ray computed tomography (CT). We quantitatively characterize the geometry of the wormholes leading to pore networks regarding their diameters, and quantities. This 3D cross-scale characterization allows for an accurate depiction of the interactions between wormholes and pore networks and provides physical insights into the initiation of wormholes. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Rock mechanics

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Rheological and stability analysis of cement pastes incorporating silica-based wastes

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Particuology 2024年第6期89卷 144-152页

作者： Julia da Rosa Martins Janaíde Cavalcante Rocha Dachamir Hotza Luciano Senff Graduate Program in Materials Science and Engineering(PPGMAT) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate Program in Civil Engineering(PPGEC) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate Program in Chemical Engineering(POSENQ) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Department of Mobility Engineering Federal University of Santa Catarina(UFSC)Joinville89219-600SCBrazil

This study investigates the influence of waste characteristics,especially zeta potential,on the properties of cement pastes and *** focus is to evaluate the impact of the zeta potential of cement particles and waste materials on the sedimentation speed,rheology,and hardening time of stabilized cement *** Cement II F 40,retarder additive,silica,and fly ash were used in the *** pastes were prepared,and during the stabilization period,their rheological properties and pH were *** zeta potential and sedimentation speed of the cement and waste particles were measured at the pH that the pastes presented during the entire stabilization *** the stabilization period,the pastes were subjected to the hardening time *** zeta potential analyses revealed diverse values for the different powder types,with the cement particles exhibiting a zeta potential of−3.0 mV,the silica particles exhibiting−10.5 mV,and the fly ash particles exhibiting−20.3 *** influence of the high zeta potential modulus was observed on the sedimentation speed,with the solution containing fly ash exhibiting a speed of 40.01μm/s,whereas the solution containing only cement exhibited a speed of 99.38μm/*** the pastes,the results indicate that the presence of fly ash particles with a significantly negative zeta potential led to a 16%reduction in hardening time compared to particles with a lower modulus of zeta *** tests showed that the inclusion of fly ash particles prevented the formation of *** the zeta potential influenced agglomerate formation and hardening time,it was found to have no effect on yield stress or viscosity.

关键词： Wastes Zeta potential Setting time Rheometry

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Two-dimensional RGO-bridge S-scheme phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions for efficient visible-light photocatalytic treatment of real pharmaceutical wastewater

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science China(Technological sciences) 2023年第10期66卷 3011-3024页

作者： WANG ZhenZhou XU XiWei DENG Fang DIONYSIOU Dionysios D LI XiBao PENG JunLong LUO XuBiao ZOU JianPing LUO ShengLian National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering(DChEE)University of CincinnatiCincinnati 45221-0012USA

The design of van der Waals heterojunctions with S-scheme charge transfer pathway is expected to be an effective strategy for improvement of photocatalytic ***,two-dimensional(2D)phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions with reduced graphene oxide as electron bridge(PCN/RGO/Bi_(5O)_(7)I)were successfully synthesized via hydrothermal *** van der Waals interaction endowed 2D PCN/RGO/Bi_(5O)_(7)I with intimate contact interface,lattice match,tunable band structure,and internal electric field,which efficiently promoted interfacial charge separation and enhanced redox ability of photogenerated charge *** a result,the S-scheme PCN/RGO/Bi_5O_7I van der Waals heterojunctions exhibited superior photocatalytic performance in ciprofloxacin degradation and real pharmaceutical wastewater *** optimized 12%PCN/RGO/Bi_5O_7I displayed the highest photocatalytic activity with 92%removal of ***,the COD removal efficiency and extent of mineralization of real pharmaceutical wastewater reached 66.9%and 59.8%,respectively,and the biodegradability of pharmaceutical wastewater was significantly *** photocatalytic mechanism of the S-scheme PCN/RGO/Bi_(5)O_(7)I van der Waals heterojunctions based on the analysis of reactive species,work function,and internal electric field was *** study provides fresh insights into plausible design of S-scheme van der Waals heterojunction to enhance photocatalytic redox ability.

关键词： S-scheme heterojunction van der Waals heterostructure photocatalytic degradation ciprofloxacin energy consumption

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Mechanically flexible V_(3)S_(4)@carbon composite fiber as a high-capacity and fast-charging anode for sodium-ion capacitors

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Rare Metals 2023年第8期42卷 2633-2642页

作者： Zhi-Fei Mao Xiao-Jun Shi Tao-Qiu Zhang Peng-Ju Liang Rui Wang Jun Jin Bei-Bei He Yan-Sheng Gong Qiang Wang Xi-Li Tong Huan-Wen Wang Faculty of Material Science and Chemistry China University of GeosciencesWuhan 430074China Engineering Laboratory of Chemical Resources Utilization in South Xinjiang of XPCC Department of Chemistry and Chemical EngineeringCollege of LifeTarim UniversityAlar 843300China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

Hybrid Na-ion capacitors(NICs)have received considerable interests owing to their low-cost,high-safety,and rapidly charging energy-storage *** NICs are composed of a capacitor-type cathode and a battery-type *** major challenge for NICs is to search for suitable electrode materials to overcome the sluggish diffusion of Na^(+)in the ***,ultrafine vanadium sulfide is encapsulated in carbon fiber(V_(3)S_(4)@CNF)as a self-supported electrode by electrospinning and in situ *** carbon cladding and one-dimensional(ID)nanofiber network-like structure could alleviate the volume expansion of V_(3)S_(4)during Na^(+)de-/intercalation ***,the V_(3)S_(4)@CNF anode exhibited a pseudocapacitive sodium storage in terms of large Na^(+)-storage capacity(476 mAh·g^(-1)at 0.1A·g^(-1)),high-rate capability(290 mAh·g^(-1)at 20.0 A·g^(-1))and excellent cycling stability(95%capacity retention for1500 cycles at 2.0 A·g^(-1))in Na *** employing V_(3)S_(4)@CNF as the anode and the activated carbon(AC)cathode,the as-assembled NICs could deliver a high energy density of 110 Wh·kg^(-1)at a power density of200 W·kg^(-1).Even at a high power of 10,000 W·kg^(-1),the specific energy is still up to 42 Wh·kg^(-1).

关键词： Electrospinning Na-ion capacitor(NIC) Nanofibers Vanadium sulfide Fast-charging

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Silver(I) triflate-catalyzed post-Ugi synthesis of pyrazolodiazepines

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Beilstein Journal of Organic Chemistry 2025年 21卷 915-925页

作者： Hasan, Muhammad Peshkov, Anatoly A. Shah, Syed Anis Ali Belyaev, Andrey Lim, Chang-Keun Wang, Shunyi Peshkov, Vsevolod A. College of Chemistry Chemical Engineering and Material Science Soochow University Suzhou 215123 China Department of Chemistry School of Sciences and Humanities Nazarbayev University Astana 010000 Kazakhstan Department of Chemistry University of Eastern Finland Joensuu FI-80101 Finland Department of Chemical and Materials Engineering School of Engineering and Digital Sciences Nazarbayev University Astana 010000 Kazakhstan

A silver(I) triflate-catalyzed post-Ugi assembly of novel pyrazolo[1,5-a][1,4]diazepine scaffolds is reported offering high yields (up to 98%) under mild conditions. The synthetic sequence involves the Ugi four-component reaction (U4CR) of pyrazole-3-carbaldehydes, primary amines, 3-substituted propiolic acids, and isocyanides, followed by a silver(I) triflate-catalyzed intramolecular heteroannulation of the resulting pyrazole-tethered propargylamides occurring in a 7-endo-dig fashion. The approach is scalable and tolerates a diverse range of substitution patterns. © 2025 Hasan et al.

关键词： heterocycles post-MCR transformations pyrazolodiazepines silver catalysis Ugi reaction

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Control of Extended Defect Growth in Perovskite Oxide Thin Films using Nanoscale Patterning

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 541-542页

作者： Ghosh, Supriya Liu, Fengdeng Jalan, Bharat Mkhoyan, K Andre Department of Chemical Engineering and Material Science University of Minnesota Minneapolis MN United States Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN United States

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