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Facile assembly of mesoporous silica nanoparticles with hierarchical pore structure for CO2 capture

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Chinese Chemical Letters 2019年第12期30卷 2347-2350页

作者： Tingting Song Hongyu Zhao Yu Hu Nannan Sun Haijiao Zhang Institute of Nanochemistry and Nanobiology Shanghai UniversityShanghai 200444China CAS Key Lab of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China

In the work,we propose an efficient one-pot approach for synthesis of a new type of mesoporous silica nanoparticles(MSNs).That can be successfully realized by using tetraethylorthosilicate(TEOS) and N-[3-(trimethoxysilyl)propyl]ethylenediamine(TSD) as the silica precursors and cetyltrimethylammonium bromide(CTAB) as the structure-directing agent through a facile assembly *** as-synthesized MSNs possess a spherical morphology with about 230 nm,a relatively high surface area of133 m^2/g,and a hierarchical pore size *** applied as the sorbents,the amine-functioned MSNs demonstrate the enhanced adsorption capacity for CO2 capture(at 1 bar,15 vol% CO2,up to80.5 mg/g at 75℃),high selectivity,and good cycling durability,benefiting from the suitable modification of polyethyleneimine.

关键词： Mesoporous silica nanoparticles Hierarchical pore structure Self-assembly Amine-functionization Adsorption

Effect of thermal annealing on the microstructure, mechanical properties and residual stress relaxation of pure titanium after deep rolling treatment

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Journal of Materials Science & Technology 2019年第3期35卷 409-417页

作者： Jie Huang Kai-Ming Zhang Yun-Fei Jia Cheng-Cheng Zhang Xian-Cheng Zhang Xian-Feng Ma Shan-Tung Tu Key Laboratory of Pressure Systems and Safety Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology AECC Commercial Aircraft Engine Co. Ltd. Shanghai Engineering Research Center for Commercial Aircraft Engine Sino-French Institute of Nuclear Engineering and Technology SunYat-Sen University

The aim of this paper was to investigate the effect of thermal annealing on the microstructure, mechanical properties, and residual stress relaxation of deep rolled pure titanium. The microstructure and mechanical properties of the surface modified layer were analyzed by metallographic microscopy, transmission electron microscope and in-situ tensile testing. The results showed that the annealed near-surface layer with fine recrystallized grains had increased ductility but decreased strength after annealing below the recrystallization temperature, where the tensile strength was still higher than that of the substrate. After annealing at the recrystallization temperature, the recrystallized near-surface layer had smaller grain size,similar tensile strength, and higher proportional limit, comparable to those of the substrate. Moreover, the residual stress relaxation showed evidently different mechanisms at three different temperature regions:low temperature(T≤ 0.2 Tm), medium temperature(T≈(0.2–0.3) Tm), and high temperature(T≥ 0.3 Tm).Furthermore, a prediction model was proposed in terms of modification of Zener-Wert-Avrami model,which showed promise in characterizing the residual stress relaxation in commercial pure Ti during deep rolling at elevated temperature.

关键词： Deep rolling Ultra-fine grain Tensile strength Microstructure Residual stress

Protein induced by vitamin K absence or antagonist-Ⅱ versus alpha-fetoprotein in the diagnosis of hepatocellular carcinoma: A systematic review with meta-analysis

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Hepatobiliary & Pancreatic Diseases International 2018年第6期17卷 487-495页

作者： Hao Xing Yi-Jie Zheng Jun Han Han Zhang Zhen-Li Li Wan-Yee Lau Feng Shen Tian Yang Department of Hepatic Surgery Eastern Hepatobiliary Surgery Hospital Naval Medical University Medical Scientific Affairs Abbott Diagnostics Faculty of Medicine The Chinese University of Hong Kong

Background: As a promising biomarker of hepatocellular carcinoma(HCC), protein induced by vitamin K absence or antagonist-Ⅱ(PIVKA-Ⅱ) has been studied extensively. However, its diagnostic capability varies across HCC studies. This study aimed to compare the performance of PIVKA-Ⅱ with alpha-fetoprotein(AFP) in the diagnosis of HCC. Data sources: A systematic literature search was conducted to identify the studies from MEDLINE, Embase and Cochrane Library Databases, which were published up to December 20, 2017 to compare the diagnostic capability of PIVKA-Ⅱ and AFP for HCC. The data were pooled using random effects model. Pooled sensitivity and specificity were calculated. Summary receiver operating characteristic curve(ROC) was employed to evaluate the diagnostic accuracy of each marker. Results: Thirty-one studies were included. The pooled sensitivity(95% CI) of PIVKA-Ⅱ and AFP was 0.66(0.65–0.68) and 0.66(0.65–0.67), respectively in diagnosis of HCC; and the corresponding pooled specificity(95% CI) was 0.89(0.88–0.90) and 0.84(0.83–0.85), respectively. The area under the ROC curve(AUC) of PIVKA-Ⅱ and AFP was 0.856(0.817–0.895) and 0.770(0.728–0.811), respectively. Subgroup analysis showed that PIVKA-Ⅱ was superior to AFP in terms of the AUC for both small HCC( < 3 cm) [0.863(0.825–0.901) vs 0.717(0.658–0.776)] and large HCC( ≥ 3 cm) [0.854(0.811–0.897) vs 0.729(0.682–0.776)]; for American [0.926(0.897–0.955) vs 0.698(0.594–0.662)], European [0.772(0.743–0.801) vs 0.628(0.594–0.662)], Asian [0.838(0.812–0.864) vs 0.785(0.764–0.806)] and African [0.812(0.794–0.840) vs 0.721(0.675–0.767)] HCC patients; and for HBV-related [0.909(0.866–0.951) vs 0.714(0.673–0.755)] and mixed-etiology [0.847(0.821–0.873) vs 0.794(0.772–0.816)] HCC. Conclusion: This meta-analysis indicates that PIVKA-Ⅱ is better than AFP in terms of the accuracy for diagnosing HCC, regardless of tumor size, patient ethnic group, or HCC etiology.

关键词： Hepatocellular carcinoma Meta-analyses Protein induced by vitamin K absence or antagonist-Ⅱ Alpha-fetoprotein

Prolonging the plasma circulation of proteins by nano- encapsulation with phosphorylcholine-based polymer

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Nano Research 2016年第8期9卷 2424-2432页

作者： Linlin Zhang Yang Liu Gan Liu Duo Xu Sheng Liang Xinyuan Zhu Yunfeng Lu Hui Wang Department of Nuclear Medicine Xinhua Hospital Affiliated to Shanghai Jiao Tong University Shanghai Jiao Tong University Shanghai 200092 China Department of Chemical and Biomolecular Engineering University of California Los Angeles California 90095 USA The Shenzhen Key Laboratory of Gene and Antibody Therapy Center for Biotechnology and Biomedicine and Division of Life and Health Sciences Tsinghua University Shenzhen 518055 China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China Key Laboratory of Functional Polymer Materials Ministry of Education Institute of Polymer Chemistry Nankai University Tianjin 300071 China

Short in vivo circulation is a major hindrance to the widespread adoption of protein therapeutics. Protein nanocapsules generated by encapsulating proteins with a thin layer of phosphorylcholine-based polymer via a two-step encapsulation process exhibited significantly prolonged plasma half-life. Furthermore, by constructing nanocapsules with similar sizes but different surface charges and chemistry, we demonstrated a generic strategy for prolonging the plasma half-life of therapeutic proteins. In an in vitro experiment, four types of bovine serum albumin （BSA） nanocapsules were incubated with fetal bovine serum （FBS） in phosphate buffer saline （PBS）; the cell uptake by HeLa cells was monitored to systematically evaluate the characteristics of the surface chemistry during drculation. Single positron emission tomography-computed tomography （SPECT） was employed to allow real-time observation of the BSA nanoparticle distribution in vivo, as well as quantification of the plasma concentration after intravenous administration. This study offers a practical method for translating a broad range of proteins for clinical use.

关键词： phosphorylcholine-basedpolymer nano-encapsulation function protein delivery protein therapy long-circulation

An efficient method for identification of risk factors

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Science China(Technological Sciences) 2009年第12期52卷 3626-3631页

作者： CHENG Jin XIAO RuCheng Department of Bridge Engineering Tongji UniversityShanghai 200092China

This paper presents a method to identify risk factors during bridge *** method integrates the concepts of analytical hierarchy process and fuzzy consistent matrix *** advantage of the method is that instead of using 9-point scale of relative importance of the conventional analytical hierarchy process,it uses a 3-point scale to describe the scale of importance,thus greatly simplifying the identification problem of risk ***,the difficulties of making judgment and comparison caused by uncertainty that jeopardizes the accuracy of the results in the conventional analytical hierarchy process can also be *** advantage of the method is that it does not involve consistency checking,thus saving a large amount of CPU *** has been demonstrated with a numerical example that the proposed fuzzy analytical hierarchy process based on 3-point scale can offer significant computational savings over the conventional analytical hierarchy process.

关键词： analytical hierarchy process risk fuzzy consistent matrix identification

The strain rate sensitive and anisotropic behavior of rare-earth magnesium alloy ZEK100 sheet

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Journal of Magnesium and Alloys 2023年第3期11卷 882-891页

作者： H.Wang X.Sun S.Kurukuri M.J.Worswick D.Y.Li Y.H.Peng P.D.Wu State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooOntario N2L 3G1Canada Department of Mechanical Engineering Mc Master UniversityHamiltonOntario L8S 4L7Canada

To overcome the limitation in formability at room temperature,manufacturers have developed magnesium alloys with remarkable properties by adding rare-earth *** rare-earth magnesium alloys behave differently from the conventional alloys,especially with respect to their coupled anisotropic and strain rate sensitive *** the current work,such behavior of the rare-earth Mg alloy ZEK100 sheet at room temperature is investigated with the aid of the elastic viscoplastic self-consistent polycrystal plasticity *** strain rate sensitivities(SRSs)for various deformation modes are employed by the model to simulate the strain rate sensitive behaviors under different loading directions and loading *** agreement between the experiments and simulations reveals the importance and necessity of using different SRSs for each deformation mode in hexagonal close-packed ***,the relative activities of each deformation mode and the texture evolution during different loadings are *** anisotropic and strain rate sensitive behavior is ascribed to the various operating deformation modes with different SRSs during loading along different directions.

关键词： Rare-earth magnesium alloy Strain rate sensitivity Twinning Crystal plasticity

Ultrastable and High-Performance Silk Energy Harvesting Textiles

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Nano-Micro Letters 2020年第1期12卷 143-157页

作者： Chao Ye Shaojun Dong Jing Ren Shengjie Ling School of Physical Science and Technology ShanghaiTech University

Energy harvesting textiles(EHTs)have attracted much attention in wearable electronics and the internet-of-things for real-time mechanical energy harvesting associated with human ***,to satisfy practical application requirements,especially the demand for long-term use,it is challenging to construct an energy harvesting textile with elegant trade-off between mechanical and triboelectric *** this study,an energy harvesting textile was constructed using natural silk inspired hierarchical structural designs combined with rational material screening;this design strategy provides multiscale opportunities to optimize the mechanical and triboelectric performance of the final textile *** resulting EHTs with traditional advantages of textiles showed good mechanical properties(tensile strength of 237±13 MPa and toughness of 4.5±0.4 MJ m−3 for single yarns),high power output(3.5 mW m−2),and excellent structural stability(99%conductivity maintained after 2.3 million multi-type cyclic deformations without severe change in appearance),exhibiting broad application prospects in integrated intelligent clothing,energy harvesting,and human-interactive interfaces.

关键词： Silk Energy harvesting textile Co-wrapped yarn Triboelectric nanogenerator

Synchrotron FTIR spectroscopy reveals molecular changes in Escherichia coli upon Cu^2＋ exposure

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Nuclear Science and Techniques 2016年第3期27卷 45-52页

作者： Xiao-Juan Hu Zhi-Xiao Liu Ya-Di Wang Xue-Ling Li Jun Hu Jun-Hong Lv Division of Physical Biology and CAS Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China shanghai Center for Bioinformation Technology Shanghai Academy of Science and TechnologyShanghai 201203China Center for Clinical and Translational Medicine Shanghai Industrial Technology InstituteShanghai 201203China

Copper ions(e.g.,Cu^(2+)) have outstanding antibacterial properties,but the exact mechanism is rather complex and not fully *** this work,synchrotron Fourier transform infrared(FTIR) spectroscopy was used as an analytical tool to investigate the CuCl_2-induced biochemical changes in Escherichia *** spectral measurements indicated that this technique is sensitive enough to detect changes in membrane lipids,nucleic acids,peptidoglycans and proteins of Cu^(2+)-treated ***,for short-time treated cells,the effects on phospholipid composition were clearly shown,while no significant alterations of proteins,nucleic acids and peptidoglycans were *** quantitative nano-mechanics mode atomic force microscopy(AFM)confirmed the changes in the topography and mechanical properties of bacteria upon the Cu^(2+) *** study demonstrated that FTIR spectroscopy combined with AFM can provide more comprehensive evaluation on the biochemical and mechanical responses of bacteria to copper.

关键词： CuCl2 红外光谱大肠杆菌同步原子力显微镜 FTIR光谱分子曝光

EXPERIMENTAL STUDY ON THE VORTEX FORMATION AND ENTRAINMENT CHARACTERISTICS FOR A ROUND TRANSVERSE JET IN SHALLOW WATER

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Journal of Hydrodynamics 2009年第3期21卷 386-393页

作者： FAN Jing-yu ZHANG Yan WANG Dao-zeng shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Ministry of Education and SMIT Center School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 China

The vortex formation and entrainment characteristics for a round transverse jet in shallow water were experimentally investigated by means of a combination of LIF flow visualization and PIV measurement. A scarf vortex wrapped around the main body of the jet is formed in the near-wall region due to the interaction between the resulting wall jet and sufficiently shallow crossflow, with some more or less unsteady flow properties and with spreading ranges as functions of both the velocity ratio and the water depth within the near field. The entrainment of the ambient crossflow fluid into the jet main body is closely associated with the time-evolving features of the shear layer between the jet and surrounding fluid as well as the induced vortical structures near the wall. In the case of slight impingement upon the wall, the interaction between the jet shear layer and the weak, unstable scarf vortex gives rise to an appreciable local entrainment enhancement, confined in the near-wall region in the vicinity of the stagnation point. While in the case of intense impingement upon the wall, the well-organized and stable scarf vortex gives rise to a greatly enhanced entrainment and a greatly increased lateral spreading rate nearly throughout the overall near field as compared to the conventional wall jet. In addition, the entrainment of the ambient crossflow fluid by the scarf vortex in this case occurs largely on the surface of the unique spiral roller structure by itself due to the presence of smaller and unorganized eddies, and accordingly the scarf vortex is likely to keep its spiral roller structure steadily to a relatively great downstream distance within the near field.

关键词： transverse jet shallow water vortex formation entrainment PIV measurement