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Octahedral silver oxide nanoparticles enabling remarkable SERS activity for detecting circulating tumor cells

Science China(Life Sciences) 2022年第3期65卷 561-571页

作者： Meng He Jie Lin Ozioma Udochukwu Akakuru xiawei xu Yanying Li Yi Cao Yanping xu Aiguo Wu Cixi Institute of Biomedical Engineering International Cooperation Base of Biomedical Materials Technology and ApplicationCAS Key Laboratory of Magnetic Materials and Devices&Zhejiang Engineering Research Center for Biomedical MaterialsNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China

The detection of circulating tumor cells(CTCs)is a crucial tool for early cancer diagnosis,prognosis,and postoperative evaluation.However,detection sensitivity remains a major challenge because CTCs are extremely rare in peripheral blood.To effectively detect CTCs,octahedral Ag_(2)O nanoparticles(NPs)with high dispersibility,good biocompatibility,remarkable surface-enhanced Raman scattering(SERS)enhancement,and obvious enhancement selectivity are designed as an SERS platform.Ag_(2)O NPs with many oxygen vacancy defects are successfully synthesized,which exhibit an ultra-high SERS enhancement factor(1.98×10^(6))for 4-mercaptopyridine molecules.The remarkable SERS activity of octahedral Ag_(2)O NPs is derived from the synergistic effect of the surface defect-promoted photo-induced charge transfer(PICT)process and strong vibration coupling resonance in the Ag_(2)O-molecule SERS complex,greatly amplifying the molecular Raman scattering crosssection.The promoted PICT process is confirmed using ultraviolet-visible(UV-Vis)absorption spectroscopy,demonstrating that obvious PICT resonance occurs in Ag_(2)O SERS system under visible light.An additional growth step of SERS bioprobe is proposed by modifying the Raman signal molecules and functional biological molecules on Ag_(2)O NPs for CTC detection.The Ag_(2)O-based SERS bioprobe exhibits excellent detection specificity for different cancer cells in rabbit blood.Importantly,the high-sensitivity Ag_(2)O-based SERS bioprobe satisfies the requirement for rare CTC detection in the peripheral blood of cancer patients,and the detection limit can reach 1 cell per m L.To our knowledge,this study is the first time that a semiconductor SERS substrate has been successfully utilized in CTC detection.This work provides new insights into CTC detection and the development of novel semiconductor-based SERS platforms for cancer diagnosis.

关键词： SERS CTCs octahedral Ag_(2)O NPs PICT cancer diagnosis

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Research progress and mechanism of nanomaterials-mediated in-situ remediation of cadmium-contaminated soil:A critical review

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Journal of Environmental Sciences 2021年第6期33卷 351-364页

作者： Yuenan Zhang Yujie Zhang Ozioma Udochukwu Akakuru xiawei xu Aiguo Wu Cixi Institute of Biomedical Engineering Chinese Academy of Science(CAS)Key Laboratory of Magnetic Materials and Devices&Zhejiang Engineering Research Center for Biomedical MaterialsNingbo Institute of Materials Technology and EngineeringCAS NingboNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China

Cadmium contamination of soil is a global issue and in-situ remediation technology as a promising mitigation strategy has attracted more and more attention.Many nanomaterials have been applied for the in-situ remediation of cadmium-contaminated soil due to their excellent properties of the nano-scale size effect.In this work,recent research progress of various nanomaterials,including carbon nanomaterials,metal-based nanomaterials and nano mineral materials,in the removal of cadmium and in-situ remediation of cadmiumcontaminated soil were systematically discussed.Additional emphases were particularly laid on both laboratory and field restoration effects.Moreover,the factors which can affect the stability of cadmium,main interaction mechanisms between nanomaterials and cadmium in the soil,and potential future research direction were also provided.Therefore,it is believed that this work will ultimately contribute to the myriad of environmental cleanup advances,and further improve human health and sustainable development.

关键词： Cadmium pollution Contaminated soil In-situ remediation Mechanism Nanomaterials

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Fast strength-ductility synergistically adjusting of cold spray additive manufactured Cu deposits via electric pulse processing

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Chinese Journal of Aeronautics 2024年第5期37卷 558-569页

作者： Dong WU Yaxin xu Wenya LI xiawei YANG Yu SU State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Friction Welding Technologies School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Electric Pulse Processing(EPP)treatment was innovatively introduced to optimize the strength and ductility of the CSAMed Cu deposits.The results show that EPP is an efficient and fast post-treatment to improve the strength and ductility(within tens of seconds).The larger the pulse current and number of pulses,the better the mechanical properties.Interestingly,this research found that when the heat input determined by pulse current and number of pulses exceeds a certain threshold(pulse current intensity is 2000 A,number of pulses is 10),increasing the number of repeat time could also effectively improve the mechanical properties.A tensile strength of 210 MPa and a ductility of 14.0%could be obtained with reasonable EPP parameters(pulse current intensity is 2000 A,number of pulses is 10,and repeat number is 2),which is similar to those of conventional annealing(e.g.,tensile strength is 272 MPa,elongation is 28.3%).The microstructure evolution analysis shows that EPP can effectively improve the bonding quality between the deposited particles by recrystallization,promote grain growth and the formation of twins,which is the main reason for the improvement of mechanical properties.

关键词： Cold spray additive manufacturing Copper deposit Mechanical property Electric pulse processing Post treatment

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A review of linear friction welding of Ni -based superalloys

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1382-1391页

作者： xiawei Yang Tingxi Meng Qiang Chu Yu Su Zhenguo Guo Rui xu Wenlong Fan Tiejun Ma Wenya Li State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China Xi’an Aerospace Engine Co.Ltd. Xi’an 710100China

Ni-based superalloys are one of the most important materials employed in high-temperature applications within the aerospace and nuclear energy industries and in gas turbines due to their excellent corrosion,radiation,fatigue resistance,and high-temperature strength.Linear friction welding(LFW)is a new joining technology with near-net-forming characteristics that can be used for the manu-facture and repair of a wide range of aerospace components.This paper reviews published works on LFW of Ni-based superalloys with the aim of understanding the characteristics of frictional heat generation and extrusion deformation,microstructures,mechanical proper-ties,flash morphology,residual stresses,creep,and fatigue of Ni-based superalloy weldments produced with LFW to enable future optim-um utilization of the LFW process.

关键词： Ni-based superalloys linear friction welding microstructures mechanical properties flash morphology

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指数平滑模型参数反分析及应用

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世界科技研究与发展 2009年第1期31卷 123-125,122页

作者：马希磊刘造保许夏伟河海大学岩土力学与堤坝工程教育部重点实验室南京210098 河海大学岩土工程科学研究所南京210098 山东佳益建筑设计有限责任公司济南250001

边坡预测是基于现有的各种监测资料分析和预测未来边坡位移或应力发展趋势,从而分析判断边坡在未来某一时期内是否稳定,或者预测滑坡发生时间的过程。反分析方法已经成为目前解决复杂岩土工程的主要方法之一,在岩土工程中得到越来越多... 详细信息

边坡预测是基于现有的各种监测资料分析和预测未来边坡位移或应力发展趋势,从而分析判断边坡在未来某一时期内是否稳定,或者预测滑坡发生时间的过程。反分析方法已经成为目前解决复杂岩土工程的主要方法之一,在岩土工程中得到越来越多的应用。基于现场的监测时间序列,应用岩土工程反分析方法反演指数平滑预测模型的参数,建立其预测模型,并应用于高边坡的变形预测中。通过应用,论证了参数反演后的指数平滑预测模型的有效性和普适性,并发现该预测模型适合于中短期预测,建议应用该模型进行高边坡变形的短中期预测。

关键词：岩土工程指数平滑模型参数反分析边坡预测

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稀土发光材料Y_(2)O_(3)∶Tb的制备及表征

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河南化工 2024年第4期41卷 1-4页

作者：韩继续王盈雪李夏薇刘书泽徐赫赤峰学院化学与生命科学学院内蒙古赤峰024000 内蒙古科技大学矿业与煤碳学院内蒙古包头014017 中国矿业大学化工学院江苏徐州221116

以硝酸钇、硝酸铽、氨水为原料,采用水热合成法制备Y_(2)O_(3)∶Tb。实验探究了所需反应物之间的最佳条件,并用红外光谱法和荧光分光光度法对样品进行了表征。结果表明,当反应物硝酸钇与硝酸铽体积比为5∶1,pH值为9.2,煅烧温度为1100℃... 详细信息

以硝酸钇、硝酸铽、氨水为原料,采用水热合成法制备Y_(2)O_(3)∶Tb。实验探究了所需反应物之间的最佳条件,并用红外光谱法和荧光分光光度法对样品进行了表征。结果表明,当反应物硝酸钇与硝酸铽体积比为5∶1,pH值为9.2,煅烧温度为1100℃时,得到样品Y_(2)O_(3)∶Tb良好。Y_(2)O_(3)∶Tb的红外特征峰在1200 cm~(-1)和560 cm~(-1)处,荧光的激发波长为518 nm,具有很强的荧光性能,是比较理想的稀土发光材料。

关键词：硝酸钇硝酸铽水热合成法 Y_(2)O_(3)∶Tb

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土工格栅加筋路堤有限元分析

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岩土工程技术 2011年第3期25卷 133-137页

作者：马希磊李致朋许夏伟交通运输部天津水运工程科学研究所天津300456

通过有限元软件ANSYS对土工格栅加筋路堤进行模拟,阐述了加筋土的加筋作用原理。通过一个工程实例分别对不加筋、仅加砂垫层、加一层土工格栅砂垫层、加两层土工格栅砂垫层四种不同的加筋路堤进行了计算。分析了不同加筋方式下加筋土路... 详细信息

通过有限元软件ANSYS对土工格栅加筋路堤进行模拟,阐述了加筋土的加筋作用原理。通过一个工程实例分别对不加筋、仅加砂垫层、加一层土工格栅砂垫层、加两层土工格栅砂垫层四种不同的加筋路堤进行了计算。分析了不同加筋方式下加筋土路基竖向位移、侧向位移、竖向应力、剪应力和筋材拉力的规律。

关键词：土工格栅有限元分析加筋路堤 ANSYS

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Grey water footprint for global energy demands

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Frontiers of Earth Science 2020年第1期14卷 201-208页

作者： Jing MING xiawei LIAO xu ZHAO Chengdu University of Information Technology School of Atomospheic SciencesChengdu 610225China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China School of Environment and Energy Peking University Shenzhen Graduate SchoolShenzhen 518055China College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of EnvironmentHohai UniversityNanjing 210098China

With a Multi-Regional Input-Output model,this study quantifies global final energy demands’grey water footprint(GWF)based on the latest available data.In 2009,9.10 km^3 of freshwater was required to dilute the pollutants generated along the life-cycle supply chain of global energy final demands to concentrations permitted by relevant environmental regulations.On a national level,final energy demands in China,USA,India,Japan,and Brazil required the largest GWF of 1.45,1.19,0.79,0.51,and 0.45 km^3 respectively,while European countries have the highest energy demands GWF per capita.From the producer perspective,the largest GWF was generated in BRIC countries,i.e.5 Russia(1.54 km^3),China(1.35 km^3),India(0.92 km^3)and Brazil(0.56 km^3)to support global final energy demands.Because of global trading activities,a country or region’s final energy demands also give rise to water pollutants beyond its territorial boundaries.Cyprus,Greece,Luxembourg,and Malta almost entirely rely on foreign water resources to dilute water pollutants generated to meet their final energy demands.Energy demands in BRIC countries have the least dependency on external water resources.On a global average,56.9%of GWF for energy demands was generated beyond national boundaries.Energy demands in the global north are inducing water pollutions in the global south.

关键词： water-energy nexus water pollution water footprint multi-regional input-output analysis

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Interruption of Klf5 acetylation in basal progenitor cells promotes luminal commitment by activating Notch signaling

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Journal of Genetics and Genomics 2022年第6期49卷 579-582页

作者： Baotong Zhang Siyuan Xia Mingcheng Liu xiawei Li Shimin Shuai Wei Tao Yixiang Li Jianping Jenny Ni Wei Zhou Lan Liao Jianming xu Jin-Tang Dong Department of Human Cell Biology and Genetics Southern University of Science and Technology School of MedicineShenzhenGuangdong 518055China Department of Hematology and Medical Oncology Emory University School of MedicineAtlantaGA 30322USA Winship Cancer Institute Emory UniversityAtlantaGA 30322USA Department of Human Cell Biology and Genetics Southern University of Science and 7.Department of Molecular and Cellular BiologyBaylor College of MedicineHoustonTXUSA

Prostate homeostasis and regeneration rely on the proper function of adult stem/progenitor cells(Ousset et al., 2012), which have also been considered as potential cells of origin for prostate cancer(Visvader, 2011) given their key positions in the lineage hierarchy and self-renewal capability. Accumulating evidence reveals the existence of multipotent progenitor cells in both basal and luminal cells.

关键词： progenitor luminal

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Characterizations and anisotropy of cold-spraying additive-manufactured copper bulk

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Journal of Materials Science & Technology 2018年第9期34卷 1570-1579页

作者： Kang Yang Wenya Li xueping Guo xiawei Yang Yaxin xu State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies School of Materials Science and EngineeringNorthwestern Polytechnical University Marine Engineering College Jimei University

In this study, thick copper coatings were deposited by cold spraying（CS） as an additive manufacturing（AM） method. The interfacial microstructure evolution and mechanical behavior were investigated for the as-sprayed and annealed conditions. In addition, experiments together with numerical simulations were employed to study the recrystallization in different stages. Finally, the mechanical anisotropy of the CSed deposit was tested for the first time, being important to the applications of CS-AM. Results show that there exist two stages of recrystallization in the spraying and annealing processes. Heat treatment has a significant effect on mechanical properties, i.e., the tensile strength increases by 34.2% while microhardness decreases by 43.6%. The mechanical anisotropy analysis shows that the tensile strengths of different directions are completely different and show some regular changes.

关键词： Cold spraying Additive manufacturing Microstructure evolution Mechanical properties Anisotropy

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