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Regulating the conductance of tungsten diselenide by oxygen plasma and improving its electrical stability by encapsulation

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Nano Research 2024年第4期17卷 3253-3260页

作者： Zhaofang Cheng Shaodan He shimin Zhang Shijun Duan Min Wang Ziyu liu Rong Zhang Wenya Qiang Xudong Zhang Minggang Xia MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Department of Applied Physics School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shaanxi Province Key Laboratory of Quantum Information and Optoelectronic Quantum Devices School of PhysicsXi’an Jiaotong UniversityXi’an 710049China

Two-dimensional(2D)tungsten selenide(WSe_(2))is promising candidate material for future electronic applications,owing to its potential for ultimate device scaling.For improving the electronic performance of WSe_(2)-based field-effect transistors(FETs),the modification of surface properties is essential.In this study,the seamless structural phase transition in WSe_(2) lattice is achieved by soft oxygen plasma,regulating the electrical conductance of WSe_(2)-based FETs.We found that during the soft oxygen plasma treatment with optimal processing time,the generated oxygen ions can substitute some selenium atoms and thus locally modify the bond length,inducing 2H→1T phase transition in WSe_(2) with seamless interfaces.The mosaic structures have been proven to tailor the electronic structure and increase the hole carrier concentration inside WSe_(2),significantly increasing the channel conductance of WSe_(2) FETs.With the further increase of the oxygen plasma treatment time,the creation of more selenium vacancy defects leads to the electronic doping,resulting in the reduction of conductance.Benefiting from the hexagonal boron nitride(h-BN)encapsulation to interrupt the partial structural relaxation from 1T to 2H phase,our WSe_(2) FET exhibits high electronic stability with conductance of 6.8×10^(-4) S,which is about four orders of magnitude higher than 2H WSe_(2)(5.8×10^(-8) S).This study could further broaden the WSe_(2) FETs in applications for functionalization and integration in electronics.

关键词： tungsten selenide(WSe2) structural phase transition oxygen plasma conductance hexagonal boron nitride(h-BN)encapsulation

Dimesitylboryl-ended oligothiophene with tetrazine as core:Synthesis,structure and Diels–Alder reactivity

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Chinese Chemical Letters 2024年第1期35卷 348-351页

作者： shimin Zhou Yang liu Yuyin Hao Zhiqiang liu Xiaoqiang Yu State Key Laboratory of Crystal Materials Shandong UniversityJi'nan 250100China Shenzhen Research Institute of Shandong University Shenzhen 518057China

A dimesitylboryl-ended oligothiophene with tetrazine as core(BTz)was synthesized and its reactivity and spectral changes toward trans-cyclooctene((4E)-TCO-OH),cis-cyclooctene and bicyclo[6.1.0]non-4-yn-9-ylmethanol were comprehensively studied.The fluorescence intensity of BTz was enhanced up to more than 100 times upon bioorthogonal reaction with(4E)-TCO-OH.In addition,the first crystal structure of isolated product of tetrazine derivative with cyclooctene was determined,which clearly confirmed a dehydrogenation occurred after Diels-Alder reaction under ambient conditions.

关键词： Tetrazine ligation Bioorthogonal reaction Crystal structure Fluorescence Quadrupolar hybrid-oligothiophene

Paternal transgenerational nutritional epigenetic effect:A new insight into nutritional manipulation to reduce the use of antibiotics in animal feeding

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Animal Nutrition 2022年第4期11卷 142-151页

作者： Xinyi Li Mengya Wang shimin liu Xiaodong Chen Yu Qiao Xiaojun Yang Junhu Yao Shengru Wu College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi 712100China Institute of Agriculture University of Western AustraliaCrawleyWA 6009Australia Department of Medicine Karolinska InstitutetSolnaStockholm 17165Sweden Department of Animal Engineering Yangling Vocational and Technical CollegeYanglingShaanxi 712100China

The use of antibiotics in animal feeding has been banned in many countries because of increasing concerns about the development of bacterial resistance to antibiotics and potential issues on food safety.Searching for antibiotic substitutes is essential.Applying transgenerational epigenetic technology to animal production could be an alternative.Some environmental changes can be transferred to memorylike responses in the offspring through epigenetic mechanisms without changing the DNA sequence.In this paper,we reviewed those nutrients and non-nutritional additives that have transgenerational epigenetic effects,including some amino acids,vitamins,and polysaccharides.The paternal transgenerational nutritional epigenetic regulation was particularly focused on mechanism of the substantial contribution of male stud animals to the animal industries.We illustrated the effects of paternal transgenerational epigenetics on the metabolism and immunity in farming animals and proposed strategies to modulate male breeding livestock or poultry.

关键词： Growth Nutrition Immune Transgenerational epigenetic Antibiotic replacement

Active and stable Cu doped NiMgAlO catalysts for upgrading ethanol to n-butanol

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Journal of Energy Chemistry 2022年第9期31卷 306-317,I0009页

作者： Zhinuo Wang Ming Yin Jifeng Pang Xianquan Li Yanan Xing Yang Su shimin liu Xiaoyan liu Pengfei Wu Mingyuan Zheng Tao Zhang CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028LiaoningChina Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023LiaoningChina

Upgrading ethanol to n-butanol is an attractive way for renewable n-butanol production. Herein, Cu was selected to modify NiMgAlO catalysts for improving ethanol conversion and n-butanol selectivity. Over the optimized 2%Cu-NiMgAlO catalyst, ethanol conversion and n-butanol selectivity were enhanced to 30.0% and 64.2%, respectively, in 200 h time on stream at 523 K. According to physicochemical characterizations and theoretical calculations, the key role of multiple active sites in this reaction was extensively investigated. The plate-like structure of hydrotalcite was maintained over 2%Cu-NiMgAlO catalysts, with an average Ni particle size of ca. 5.4 nm. The presence of Cu species created CuNi alloy sites and Lewis acid-base pairs, and increased hydrogen transfer and condensation reactions, resulting in elevated ethanol conversion and n-butanol selectivity. Additionally, CuNi alloy had a strong interaction with CuNiMgAl oxides, forming homogeneous boundary due to their close ionic radius and lattice matching, and afforded the long time stability in the ethanol to n-butanol reaction.

关键词： Hydrotalcite Copper Catalysis Ethanol n-Butanol

Respirable nano-particulate generations and their pathogenesis in mining workplaces:a review

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International Journal of Coal Science & Technology 2021年第2期8卷 179-198页

作者： Long Fan shimin liu Department of Energy and Mineral Engineering G3 Center and EMS Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA

There is a growing concern in mining community about the contribution of nano-particulates to miner's health.Despite the health influence of respirable dusts and associated lung diseases have been recognized for decades in the mining industry,the nano-scale particulates accompanying with complicated physiochemical properties and their enor-mous contribution in quantity have been drawing attentions only in recent a few years because of the advancement of nano-science discipline.In this review,we examine the current regulations of dusts exposure and the dominant mass-based monitoring methods to point out the ignorance of nano-particulates in mining industry.The recognized mining-related nano-particulates sources are summarized to identify the mechanically generated finer particulates including particles and aerosols.In addition,the mechanism of adverse health impact on miner with exposure to nano-scale particulates is discussed in a detail to emphasize their substantial detriment as a potential respiratory hazard.Characterization of the complex physiochemical properties of nano-particulates are then summarized and discussed because these properties could be different from regular respirable dusts due to their dramatically increased surface area and particulate counts.The intent of this review is to demonstrate the potential of adverse health effect of nano-particulate on the mine personals throughout the mining cycle and to identify the research gaps of the mine nano-particulate characterization and quantification.We suggest that further understanding of the mining induced nano-particulate properties and their pathogenesis are critical for the future engineering control measure to mitigate the potential health threat for future miners.

关键词： Nano-particulate Lung diseases Generation sources Nano-scale characterization

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高熵陶瓷材料研究进展及挑战

材料工程 2024年第1期52卷 83-100页

作者：王云平刘世民董闯大连交通大学材料科学与工程学院辽宁大连116028 大连大学辽宁大连116622 大连理工大学三束材料改性教育部重点实验室辽宁大连116024

高熵作为全新的材料体系,得益于巨大的组分空间、独特的微观结构以及较大的构型熵所赋予其独特且可调的优异性能,已成为材料领域的研究热点。高熵陶瓷的研究目前还处于探索阶段,尤其在精准的成分设计理论、高纯高产率粉体制备、新型烧... 详细信息

高熵作为全新的材料体系,得益于巨大的组分空间、独特的微观结构以及较大的构型熵所赋予其独特且可调的优异性能,已成为材料领域的研究热点。高熵陶瓷的研究目前还处于探索阶段,尤其在精准的成分设计理论、高纯高产率粉体制备、新型烧结工艺等方面,亟待深入研究。因此,本文针对高熵陶瓷的五大高熵效应、新的设计理论、粉体制备方法、新型烧结工艺以及综合性能与实际应用进行了梳理归纳,并通过团簇加连接原子模型(CPGA)对高熵陶瓷(HEC)成分设计进行解析,深入挖掘了HEC的组元和微结构以及性能之间的关系。未来HEC的重点发展方向仍然为基础理论设计,尤其是针对非氧化物HEC成分结构。同时,在样品制备上要在学科交叉领域寻找突破,如采用人工智能机器学习与3D打印进行制备。最后,要寻找结构、热障耐腐涂层、机械、工程光学和磁性等方面实际应用并对探究工况环境下的强化、失效机制深入探究分析。

关键词：高熵陶瓷成分设计团簇加连接原子模型(CPGA) 制备工艺性能应用

Water sorption on coal:effects of oxygen-containing function groups and pore structure

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International Journal of Coal Science & Technology 2021年第5期8卷 983-1002页

作者： Ang liu shimin liu Peng liu Kai Wang Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China School of Emergency Management and Safety Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Coal-water interactions have profound influences on gas extraction from coal and coal utilization.Experimental measurements on three coals using X-ray photoelectron spectroscopy(XPS),low-temperature nitrogen adsorption and dynamic water vapor sorption(DVS)were conducted.A mechanism-based isotherm model was proposed to estimate the water vapor uptake at various relative humidities,which is well validated with the DVS data.The validated isotherm model of sorption was further used to derive the isosteric heat of water vapor sorption.The specific surface area of coal pores is not the determining parameter that controls water vapor sorption at least during the primary adsorption stage.Oxidation degree dominates the primary adsorption,and which togethering with the cumulative pore volume determine the secondary adsorption.Higher temperature has limited effects on primary adsorption process.The isosteric heat of water adsorption decreases as water vapor uptake increases,which is found to be close to the latent heat of bulk water condensation at higher relative humidity.The results confirmed that the primary adsorption is controlled by the stronger bonding energy while the interaction energy between water molecules during secondary adsorption stage is relatively weak.However,the thermodynamics of coal-water interactions are complicated since the internal bonding interactions within the coal are disrupted at the same time as new bonding interactions take place within water molecules.Coal has a shrinkage/swelling colloidal structure with moisture loss/gain and it may exhibit collapse behavior with some collapses irreversible as a function of relative humidity,which further plays a significant role in determining moisture retention.

关键词： Water vapor Isotherm Surface oxidation Pore collapse Isosteric heat of adsorption

甜酒曲发酵小米酒精饮料工艺优化及其品质分析

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食品工业科技 2024年第9期45卷 186-195页

作者：张瑞刘敬科刘俊利常世敏河北省农林科学院生物技术与食品科学研究所河北石家庄050000 河北工程大学生命科学与食品工程学院河北邯郸056038

为增加小米资源利用率,本文以小米为原料用甜酒曲发酵成小米酒精饮料,采用可溶性固形物、总酸及感官评分为综合评价指标,通过单因素实验和响应面试验研究小米酒精饮料的最佳工艺,并对其营养品质、抗氧化能力和挥发性风味物质进行测定。... 详细信息

为增加小米资源利用率,本文以小米为原料用甜酒曲发酵成小米酒精饮料,采用可溶性固形物、总酸及感官评分为综合评价指标,通过单因素实验和响应面试验研究小米酒精饮料的最佳工艺,并对其营养品质、抗氧化能力和挥发性风味物质进行测定。结果表明:甜酒曲添加量1%、发酵时间3 d、发酵温度32℃为最佳。所得产品可溶性固形物为22.05%,总酸为19.33 g/L,感官评分为89.37分,酒精度0.7%vol,黄酮含量66.78 mg/L,多酚含量65.13 mg/L。所测矿物质中钾含量最高,所测维生素中烟酰胺含量最高,DPPH自由基清除率73.19%,ABTS+自由基清除率34.29%,羟自由基清除率53.72%。此外,共检测到46种挥发性风味物质,种类最多的为酯类和醇类,它们共同赋予小米酒精饮料特有的香气。该产品营养丰富且滋味浓郁、酸甜适中,可为开发以小米为原料的功能性食品提供理论参考。

关键词：小米甜酒曲发酵酒精饮料活性成分抗氧化挥发性风味

Experimental study on the adverse effect of gel fracturing fluid on gas sorption behavior for Illinois coal

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International Journal of Coal Science & Technology 2021年第6期8卷 1250-1261页

作者： Qiming Huang Jun Li shimin liu Gang Wang College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China

Hydraulic fracturing is an effective technology for coal reservoir stimulation.After fracturing operation and flowback,a fraction of fracturing fluid will be essentially remained in the formation which ultimately damages the flowability of the formation.In this study,we quantified the gel-based fracturing fluid induced damages on gas sorption for Illinois coal in US.We conducted the high-pressure methane and CO_(2)sorption experiments to investigate the sorption damage due to the gel residue.The infrared spectroscopy tests were used to analyze the evolution of the functional group of the coal during fracturing fluid treatment.The results show that there is no significant chemical reaction between the fracturing fluid and coal,and the damage of sorption is attributed to the physical blockage and interactions.As the concentration of fracturing fluid increases,the density of residues on the coal surface increases and the adhesion film becomes progressively denser.The adhesion film on coal can apparently reduce the number of adsorption sites for gas and lead to a decrease of gas sorption capacity.In addition,the gel residue can decrease the interconnectivity of pore structure of coal which can also limit the sorption capacity by isolating the gas from the potential sorption sites.For the low concentration of fracturing fluid,the Langmuir volume was reduced to less than one-half of that of raw coal.After the fracturing fluid invades,the desorption hysteresis of methane and CO_(2)in coal was found to be amplified.The impact on the methane desorption hysteresis is significantly higher than CO_(2)does.The reason for the increasing of hysteresis may be that the adsorption swelling caused by the residue adhered on the pore edge,or the pore blockage caused by the residue invasion under high gas pressure.The results of this study quantitatively confirm the fracturing fluid induced gas sorption damage on coal and provide a baseline assessment for coal fracturing fluid formulation and technology.

关键词： Hydraulic fracturing Fracturing fluid Coalbed methane Sorption hysteresis