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Nb_(2)CT_(x)MXene boosting PEO polymer electrolyte for all-solid-state Li-S batteries:two birds with one stone strategy to enhance Li+conductivity and polysulfide adsorptivity

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稀有金属:英文版 2023年第8期42卷 2562-2576页

作者： Si-Ming Liu Meng-Xun Chen Ying Xie Deng-Hua Liu Jin-Fei Zheng Xiang Xiong Heng Jiang Li-Chang Wang Heng Luo Kai Han State Key Laboratory for Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Shinghwa Advanced Material Group Co. LtdDongying 257500China School of Physics and Electronics Central South UniversityChangsha 410083China Department of Chemistry Oregon State UniversityCorvallis OR 97331-4003USA School of Geosciences and Info-Physics Central South UniversityChangsha 410083China

All-solid-state lithium-sulfur(Li-S)battery is regarded as next-generation high energy density and safety battery *** key challenge is to develop a compatible high-performance solid-state ***,a two birds with one stone strategy is proposed to simultaneously enhance Li+conductivity and polysulfide adsorptivity of poly(ethylene oxide)(PEO)-based polymer electrolyte via the integration of Nb_(2)CT_(x)***,the sheet size of Nb_(2)CT_(x)MXene is crucial for the enhancement of Li^(+)conductivity and polysulfide adsorptivity,attributing to the difference in a specific surface area related to the percolation *** tuning the sheet size of Nb_(2)CT_(x)MXene from 500-300 nm to below 100 nm,the ionic conductivity of the PEO electrolyte is increased to2.62×10^(-4)S·cm^(-1)with improved Li+transference number of 0.37 at ***,theoretical calculation and X-ray photoelectron spectroscopy(XPS)conjointly prove that poly sulfides could be effectively adsorbed by Nb2CTxnanosheets via forming Nb-S bonding to inhibit their shuttle in the PEO *** a result,the all-solid-state Li-S cell exhibits an initial capacity of 1149 mAh·g^(-1)at 0.5C and good cycling stability with 491 mAh·g^(-1)after 200 *** results demonstrate the necessity of polysulfide inhibition and the application of Nb_(2)CT_(x)MXene in PEO-based electrolytes for all-solid-state Li-S batteries.

关键词： All-solid-state Li-S batteries Polyethylene oxide(PEO)-based electrolyte Nb_(2)CT,MXene Shuttle effect inhibition

Preparation of aldoxime through direct ammoximation using titanium silicalite-1 catalyst

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Chinese Journal of Chemical Engineering 2022年第7期35卷 11-17页

作者： Zhigang Xu Xiongfei Jin Tao Zhou Qian Zou Longcheng Liu zhongbo Wang Hanbing Sheng Huasheng Xie Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Kopperchem Industry Corp. LTDSolvent Extraction Engineering Research CenterChongqing 401221China Cangzhou Dahua Group Co. Ltd.Cangzhou 061000China

The liquid phase direct ammoximation of 5-isooctyl salicylaldehyde with ammonia and hydrogen peroxide was studied using titanium silicalite-1(TS-1)*** effect of reaction parameters on the yield of the product was studied,which include reaction temperature,reaction time,molar ratio of ammonia to aldehyde as well as hydrogen peroxide to *** influence of the amount of catalyst on the reaction results was also *** maximum 5-isooctyl salicylaldoxime yield of 98.76%was achieved under the following optimal reaction conditions:the molar ratio of 5-isooctylaldehyde to hydrogen peroxide and ammonia of 1:1.4:1.6,the reaction temperature of 70℃,the amount of TS-1 of 17.5 g·mol^(-1)(5-isooctyl salicylaldehyde),and the feeding time of 2 *** method has the mild reaction conditions and avoids the shortcomings of traditional ***,useless inorganic salts by-products are avoided,and there is no environmental pollution.

关键词： Titanium silicalite-1 Ammoximation Aldoxime Extractant Process optimization

Light and temperature dual responsive pesticide release system based on mesoporous silica nanoparticles modified by dopamine

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Journal of central south university 2022年第2期29卷 397-409页

作者： XUWen-shuang YANG Zhou-xiao-shuang ZHANG Guang-yang LIU Hui Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Yongzhou Vocational Technical College Yongzhou 425100China

A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine based mesoporous silica nanoparticles(MSNs).The resulting polymer brush,MSNs-g-PVNM,was characterized by FT-IR,TEM,TGA and *** dual responsive behaviors of MSNs-g-PVNM were systematically *** imidacloprid as the model guest pesticide,the loading percentage and loading efficiency of the polymer brush were determined as 9.2%and 40.6%,*** release efficiency of imidacloprid in MSNs-g-PVNM was the lowest value of 5.4%at 20℃ and 365 nm,and it reached the highest value of 52.4%at 50℃ and 254 *** loss percentage of imidacloprid on the leaves contained imidacloprid-loaded MSNs-g-PVNM(8.4%)was much less than that contained only imidacloprid(25.2%)after three *** was confirmed that the release process of imidacloprid was well regulated through changing external conditions such as light and temperature.

关键词： N-vinylcaprolactam controlled release system stimuli-responsive mesoporous silica nanoparticles imidacloprid

Cold model on bubble growth and detachment in bottom blowing process

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 213-221页

作者： Hong-jie YAN Jun-bing XIAO Yan-po SONG Zhi-wen HU Zhi-kai TAN Liu LIU School of Energy Science and Engineering Central South University Changsha 410083 China Hunan Key Laboratory of Energy Conservation in Process Industry Central South University Changsha 410083 China

The bubble growth and detachment behavior in the bottom blowing process were investigated. Four multi-hole nozzle configurations with different opening ratios were assessed experimentally using high-speed photography and digital image processing. For these configurations, the experiments reveal that the bubble growth consists of a petal-like stage, an expansion stage and a detachment stage. The petal-like shape is qualitatively described through the captured images, while the non-spherical bubbles are analyzed by the aspect ratio. The bubble size at the detachment is quantified by the maximum caliper distance and the bubble equivalent diameter. Considering the dependence on the opening ratio, different prediction models for the ratio of maximum caliper distance to hydraulic diameter of the nozzle outlet and the dimensionless bubble diameter are established. The comparative analysis results show that the proposed prediction model can accurately predict the bubble detachment size under the condition of multi-hole nozzles.

关键词： bottom blowing bubble growth nozzle geometry non-spherical bubble

Preparation of high-mechanical-property medium-entropy CrCoNi alloy by asymmetric cryorolling

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Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1559-1574页

作者： Yu-ze WU Zhao-yang ZHANG Juan LIU Charlie KONG Yu WANG Puneet TANDON Alexander PESIN Hai-liang YU State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China Mark Wainwright Analytical Centre University of New South WalesSydneyNSW 2052Australia PDPM Indian Institute of Information Technology Design and ManufacturingJabalpur 482005India Laboratory of Mechanics of Gradient Nanomaterials Nosov Magnitogorsk State Technical UniversityMagnitogorsk 455000Russia

In order to obtain good strength−plasticity synergy for a medium entropy alloy(MEA)CrCoNi,cold rolling,asymmetric rolling,cryorolling and asymmetric-cryorolling with subsequent annealing at different temperatures were *** results showed that the asymmetric-cryorolled alloy achieved a high strength of over 1.6 *** annealing at 1073 K,it retained a high strength of~1 GPa while the elongation reached nearly 60%.After annealing,the heterogeneous characteristics were formed in asymmetric-cryorolled samples,which were found to be more distinct than those of the samples subjected to asymmetric *** resulted in the generation of high strength and ductility.

关键词： medium entropy alloy heterogeneous structure annealing mechanical properties asymmetric cryorolling

Bone biomaterials and interactions with stem cells

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Bone Research 2017年第4期5卷 253-285页

作者： Chengde Gao Shuping Peng Pei Feng Cijun Shuai State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangshaChina The Key Laboratory of Carcinogenesis of the Chinese Ministry of Health Xiangya HospitalCentral South UniversityChangshaChina The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education Cancer Research InstituteCentral South UniversityChangshaChina Jiangxi university of Science and Technology GanzhouChina Key Laboratory of Organ Injury Aging and Regenerative Medicine of Hunan ProvinceXiangya HospitalCentral South UniversityChangshaChina

Bone biomaterials play a vital role in bone repair by providing the necessary substrate for cell adhesion, proliferation, and differentiation and by modulating cell activity and function. In past decades, extensive efforts have been devoted to developing bone biomaterials with a focus on the following issues：（1） developing ideal biomaterials with a combination of suitable biological and mechanical properties; （2） constructing a cell microenvironment with pores ranging in size from nanoscale to submicro- and microscale; and （3） inducing the oriented differentiation of stem cells for artificial-to-biological transformation. Here we present a comprehensive review of the state of the art of bone biomaterials and their interactions with stem cells. Typical bone biomaterials that have been developed, including bioactive ceramics, biodegradable polymers, and biodegradable metals, are reviewed, with an emphasis on their characteristics and applications. The necessary porous structure of bone biomaterials for the cell microenvironment is discussed, along with the corresponding fabrication methods. Additionally, the promising seed stem cells for bone repair are summarized, and their interaction mechanisms with bone biomaterials are discussed in detail. Special attention has been paid to the signaling pathways involved in the focal adhesion and osteogenic differentiation of stem cells on bone biomaterials. Finally, achievements regarding bone biomaterials are summarized, and future research directions are proposed.

关键词： Bone biomaterials and interactions with stem cells

Corrosion behavior of Cu-Al-Mn-Zn-Zr shape memory alloy in NaCl solution

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 1012-1022页

作者： Mo-yang YIN Zhou LI Zhu XIAO Yong PANG Ya-ping LI Zi-yan SHEN School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Non-ferrous Metal Materials Science and Engineering Ministry of EducationCentral South UniversityChangsha 410083China

The corrosion behavior of a copper-based shape memory alloy(Cu-Al-Mn-Zn-Zr) in 3.5 wt.% Na Cl solution was investigated by means of potentiodynamic polarization measurements, electrochemical impedance spectroscopy(EIS) and X-ray photoelectron spectroscopy(XPS). At the beginning of corrosion, oxidation products formed on the surface of the shape memory alloy and constantly covered the reaction surface, resulting in the decrease of corrosion rate. After 4 d of immersion in NaCl solution, the corrosion product layer became thick and porous, leading to the increase of corrosion rate, and the corrosion reaction mechanism changed from polarization control to diffusion control. The diffusion impedance increased with increasing thickness of the oxide layer for the samples immersed in NaCl solution for 6-15 d. During the whole corrosion process, the reaction mechanism of the alloy changed and the corrosion resistance was improved continuously. The corrosion products mainly contained CuO, ZnO, Al2O3, MnO/Mn2O3, MnO2 and Al(OH)3. Transition of the corrosion products from Cu2O to CuO and Al2O3 to Al(OH)3 occurred during corrosion.

关键词： Cu-based shape memory alloy corrosion behavior polarization diffusion impedance

Physicochemical properties of arsenic-bearing lime-ferrate sludge and its leaching behaviors

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Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1188-1198页

作者： Bing PENG Jie LEI Xiao-bo MIN Li-yuan CHAI Yan-jie LIANG Yang YOU School of Metallurgy and Environment Central South University Changsha 410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Central South University Changsha 410083 China

Physicochemical properties and leaching behaviors of two typical arsenic-bearing lime?ferrate sludges(ABLFS),waste acid residue(WAR)and calcium arsenate residue(CAR),are comprehensively *** chemical composition,morphological features,phase composition and arsenic occurrence state of WAR and CAR are analyzed by ICP?AES,SEM?EDS,XRD,XPS and chemical phase *** toxicity leaching test and three-stage BCR sequential extraction procedure are utilized to investigate arsenic leaching *** results show that the contents of arsenic in WAR and CAR are2.5%and21.2%and mainly present in the phases of arsenate and arsenic oxides dispersed uniformly or agglomerated in amorphous *** leaching concentrations of arsenic excess119and1063times of TCLP standard regulatory level with leaching rates of47.66%and50.15%for WAR and CAR,***90%of extracted arsenic is in the form of acid soluble and reducible,which is the reason of high arsenic leaching toxicity and environmental activity of *** research provides comprehensive information on harmless disposal of ABLFS from industrial wastewater treatment of lime?ferrate process.

关键词： arsenic-bearing sludge lime.ferrate sludge physicochemical properties leaching behavior BCR sequential extraction

A Survey on Emerging Computing Paradigms for Big Data

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Chinese Journal of Electronics 2017年第1期26卷 1-12页

作者： ZHANG Yaoxue REN Ju LIU Jiagang XU Chugui GUO Hui LIU Yaping School of Information Science and Engineering Central South University Research Institute of Information Security and Big Data Central South University

The explosive growth of data volume and the ever-increasing demands of data value extraction have driven us into the era of big data. The "5V"(Variety,Velocity, Volume, Value, and Veracity) characteristics of big data pose great challenges to traditional computing paradigms and motivate the emergence of new *** computing is one of the representative technologies that can perform massive-scale and complex data computing by taking advantages of virtualized resources, parallel processing and data service integration with scalable data storage. However, as we are also experiencing the revolution of Internet-of-things(IoT), the limitations of cloud computing on supporting lightweight end devices significantly impede the flourish of cloud computing at the intersection of big data and IoT era. It also promotes the urgency of proposing new computing paradigms. We provide an overview on the topic of big data, and a comprehensive survey on how cloud computing as well as its related technologies can address the challenges arisen by big ***, we analyze the disadvantages of cloud computing when big data encounters IoT, and introduce two promising computing paradigms, including fog computing and transparent computing, to support the big data services of IoT. Finally, some open challenges and future directions are summarized to foster continued research efforts into this evolving field of study.

关键词： Computing paradigm Big data Cloud computing Transparent computing Fog computing Internet-of-things(IoT)