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| 1 | High-entropy(Ca_(0.2)Sr_(0.2)Ba_(0.2)La_(0.2)Pb_(0.2))TiO_(3) perovskite ceramics with A-site short-range disorder for thermoelectric applications显示文摘Novel high-entropy perovskite-type(Ca_(0.2)Sr_(0.2)Ba_(0.2)La_(0.2)Pb_(0.2))TiO_(3)(CSBLP)ceramics with cubic structure of Pm-3 m space group were successful prepared by solid-state reaction method.Results of XRD,SEM-EDS,HRTEM confirmed a homogeneous distribution and equimolar arrangement of multicomponent cations on the A-site.The high-entropy CSBLP ceramics showed long-range structural order and short-range chemical disorder with widely dispersed nanoscale grains varying sizes of 4-6 nm in the microstructure.Because of increased configurational entropy,the CSBLP ceramic has an enhanced Seebeck coefficient(|S|=272μV/K at 1073 K)and low thermal conductivity(k=1.75 W/m·K at 1073 K)when annealed at1300℃.This work demonstrates the possibility of effectively reducing thermal conductivity and improving the performance of thermoelectric oxides through high-entropy composition design. | Ping Zhang Zhihao Lou Mengjie Qin Jie Xu Jiatong Zhu Zongmo Shi Qian Chen Michael J.Reece Haixue Yan Feng Gao | 2022 | Journal of Materials Science & Technology2022，，2： | 3 |
| 2 | A miniaturized transit-time ultrasonic flowmeter based on ScAIN piezoelectric micromachined ultrasonic transducers for small-diameter applications显示文摘Transit-time ultrasonic flowmeters(TTUFs)are among the most widely used devices for flow measurements.However,traditional TTUFs are usually based on a bulk piezoelectric transducer,which limits their application in small-diameter channels.In this paper,we developed a miniaturized TTUF based on scandium-doped aluminum nitride(ScAIN)piezoelectric micromachined ultrasonic transducers(PMUTs).The proposed TTUF contains two PMUT-based transceivers and a T-type channel.The PMUTs contain 13×13 square cells with dimensions of 2.8×2.8 mm^(2).To compensate for the acoustic impedance mismatch with liquid,a layer of polyurethane is added to the surface of the PMUTs as a matching layer.The PMUT-based transceivers show good transmitting sensitivity(with 0.94 MPaN surface pressure)and receiving sensitivity(1.79 mV/kPa)at a frequency of 1 MHz in water.Moreover,the dimensions of the Ttype channel are optimized to achieve a measurement sensitivity of 82 ns/(m/s)and a signal-to-noise ratio(SNR)better than 15 dB.Finally,we integrate the fabricated PMUTs into the TDC-GP30 platform.The experimental results show that the developed TTUF provides a wide range of flow measurements from 2 to 300 L/h in a channel of 4 mm diameter,which is smaller than most reported channels.The accuracy and repeatability of the TTUF are within 0.2%and 1%,respectively.The proposed TTUF shows great application potential in industrial applications such as medical and Chemical applications. | Yunfei Gao Minkan Chen Zhipeng Wu Lei Yao Zhihao Tong Songsong Zhang Yuandong Alex Gui Liang Lou | 2023 | Microsystems & Nanoengineering2023，9，2： | 0 |
| 3 | Observation-based sources evolution of non-methane hydrocarbons (NMHCs) in a megacity of China显示文摘Both concentrations and emissions of many air pollutants have been decreasing due to implement of control measures in China,in contrast to the fact that an increase in emissions of non-methane hydrocarbons(NMHCs)has been reported.This study employed seven years continuous NMHCsmeasurements and the related activities data of Shanghai,a megacity in China,to explore evolution of emissions and effectiveness of air pollution control measures.The mixing ratio of NMHCs showed no statistical interannual changes,of which their compositions exhibited marked changes.This resulted in a decreasing trend of ozone formation potential by 3.8%/year(p<0.05,the same below),which should be beneficial to ozone pollution mitigation as its production in Shanghai is in the NMHCs-limited regime.Observed alkanes,aromatics and acetylene changed by+3.7%/year,-5.9%/year and-7.4%/year,respectively,and alkenes showed no apparent trend.NMHCs sources were apportioned by a positive matrix factorization model.Accordingly,vehicular emissions(-5.9%/year)and petrochemical industry emissions(-7.1%/year)decreased significantly,but the decrease slowed down;significant reduction in solvent usage(-9.0%/year)appeared after 2010;however,emissions of natural gas(+12.6%/year)and fuel evaporation(with an increasing fraction)became more important.The inconsistency between observations and inventories was found in interannual trend and speciation as well as source contributions,emphasizing the need for further validation in NMHCs emission inventory.Our study confirms the effectiveness of measures targeting mobile and centralized emissions from industrial sources and reveals a need focusing on fugitive emissions,which provided new insights into future air policies in polluted region. | Yarong Peng Hongli Wang Qian Wang Shengao Jing Jingyu An Yaqin Gao Cheng Huang Rusha Yan Haixia Dai Tiantao Cheng Qiang Zhang Meng Li Jianlin Hu Zhihao Shi Li Li Shengrong Lou Shikang Tao Qinyao Hu Jun Lu Changhong Chen | 2023 | Journal of Environmental Sciences2023，，2： | 0 |
| 4 | Osteopontin Promotes Macrophage M1 Polarization by Activation of the JAK1/STAT1/HMGB1 Signaling Pathway in Nonalcoholic Fatty Liver Disease显示文摘Background and Aims:Osteopontin(OPN)is reported to be associated with the pathogenesis of nonalcoholic fatty liver disease(NAFLD).However,the function of OPN in NAFLD is still inconclusive.Therefore,our aim in this study was to evaluate the role of OPN in NAFLD and clarify the involved mechanisms.Methods:We analyzed the expression change of OPN in NAFLD by bioinformatic analysis,qRT-PCR,western blotting and immunofluorescence staining.To clarify the role of OPN in NAFLD,the effect of OPN from HepG2 cells on macrophage polarization and the involved mechanisms were examined by FACS and western blotting.Results:OPN was significantly upregulated in NAFLD patients compared with normal volunteers by microarray data,and the high expression of OPN was related with disease stage and progression.OPN level was also significantly increased in liver tissue samples of NAFLD from human and mouse,and in HepG2 cells treated with oleic acid(OA).Furthermore,the supernatants of OPN-treated HepG2 cells promoted the macrophage M1 polarization.Mechanistically,OPN activated the janus kinase 1(JAK1)/signal transducers and activators of transcription 1(STAT1)signaling pathway in HepG2 cells,and consequently HepG2 cells secreted more high-mobility group box 1(HMGB1),thereby promoting macrophage M1 polarization.Conclusions:OPN promoted macrophage M1 polarization by increasing JAK1/STAT1-induced HMGB1 secretion in hepatocytes. | Zhihao Xu Feiyang Xi Xinxin Deng Yuqi Ni Changqin Pu Dan Wang Weiming Lou Xufang Zeng Ning Su Chen Chen Ziqiang Zeng Libin Deng Meixiu Jiang | 2023 | Journal of Clinical and Translational Hepatology2023，11，2： | 0 |
| 5 | In-situ construction of all-scale hierarchical microstructure and thermoelectric properties of(Sr_(0.25)Ca_(0.25)Ba_(0.25)La_(0.25))TiO_(3)/Pb@Bi composite oxide ceramics显示文摘SrTiO_(3)-based oxides have been investigated as a promising n-type thermoelectric material at high temperatures;however,the relatively high thermal conductivity results in inferior thermoelectric performance.The lattice thermal conductivity can be significantly reduced by high-entropy engineering via severe lattice distortion.However,high configuration entropy also causes the deterioration of carrier mobility and restrains electron transport resulting in low electrical conductivity.In this work,the low lattice thermal conductivity of 1.7 W/(m·K)at 1073 K and significantly improved electrical conductivity of 112 S/cm from 60 S/cm can be achieved in n-type(Sr_(0.25)Ca_(0.25)Ba_(0.25)La_(0.25))TiO_(3)/Pb@Bi composites ceramics with core-shell grains of all-scale hierarchical microstructure.The effects of the complex microstructure of core-shell grains as well as the precipitated Pb@Bi particles on electrons and phonons transport properties were systematically explored.ZTmax of 0.18 was obtained for the SPS-1200,which was 1.5 times that of pure high-entropy(Ca_(0.2)Sr_(0.2)Ba_(0.2)La_(0.2)Pb_(0.2))TiO_(3)samples prepared by a solid-state method.This improvement in thermoelectric performance contributes to the addition of Bi_(2)O_(3)into the high-entropy(Sr_(0.2)Ca_(0.2)Ba_(0.2)Pb_(0.2)La_(0.2))TiO_(3)matrix resulting in multiphase core-shell grain structure combined with well-dispersed nano-sized metal Pb@Bi precipitates in the matrix.This feasible strategy of in-situ constructing all-scale hierarchical nanostructures can also be applied to enhance the performance of other thermoelectric systems. | Ping Zhang Zhihao Lou Guoxin Hu Zhuozhao Wu Jie Xu Lingyun Gong Feng Gao | 2023 | Journal of Materiomics2023，9，4： | 0 |
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