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Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses

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Journal of Materials Science & Technology 2021年第11期70卷 205-213页

作者： Yuan-Yun Zhao Feng Qian Chengliang Zhao chunxiao xie Jianguo Wang Chuntao Chang Yanjun Li Lai-Chang Zhang Neutron Scattering Technical Engineering Research Center School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim7491Norway Edith Cowan University School of Engineering270 Joondalup DriveJoondalupPerthWA6027Australia School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China

Nanoporous metals prepared by dealloying have attracted increasing attention due to their interesting size-dependent physical,chemical,and biological ***,facile fabrication of metallic ultrathin freestanding nanoporous films(UF-NPFs)by dealloying is still ***,we report a novel strategy of facile preparation of flexible Cu,Cu_(3)Ag,and CuAg UF-NPFs by dealloying thick Mg-Cu(Ag)-Gd metallic glass *** dealloying,the local reaction latent heat-induced glass transition of the precursor ribbons leads to the formation of a solid/liquid interface between the initially dealloyed nanoporous layer and the underlying supercooled liquid *** to the bulging effect of in situ generated H2 on the solid/liquid interface,Cu,Cu_(3)Ag,and CuAg UF-NPFs with thicknesses of~200 nm can self-peel off from the outer surface of the dealloying ***,it was found that the surfaceenhanced Raman scattering(SERS)detection limit of Rhodamine 6G(R6G)on the Cu and CuAg UF-NPF substrates are 10^(-6)M and 10^(-11)M,respectively,which are lower than most of the Cu and Cu-Ag substrates prepared by other *** work presents a reliable simple strategy to synthesize a variety of cost effective and flexible metallic UF-NPFs for functional applications.

关键词： Metallic glasses Dealloying Nanoporous metals Ultrathin freestanding films Surface-enhanced Raman scattering(SERS)

Facile synthesis of metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses

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Journal of Materials Science & Technology 2021年第23期82卷 144-152页

作者： Yuan-Yun Zhao Feng Qian Wenfeng Shen Chengliang Zhao Jianguo Wang chunxiao xie Fengling Zhou Chuntao Chang Yanjun Li Neutron Scattering Technical Engineering Research Center School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Department of Materials Science and Engineering Norwegian University of Science and TechnologyTrondheim7491Norway Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan University of TechnologyDongguan523808China

Metal and alloy nanoparticles synthesized by chemical reduction have attracted increasing attention due to their superior physical,chemical,and biological ***,most chemical synthesis processes rely on the use of harsh reducing agents and complicated chemical ***,we report a novel reduction-agent-free and surfactant(stabilizer)-free strategy to synthesize Cu,Ag,Au,Cu-Pt,Cu-Au,Cu-Au-Pt-Pd,and Au-Pt-Pd-Cu nanoparticles by ultrasound-assisted dealloying of Mgbased metallic *** formation mechanism of the metal and alloy nanoparticles is revealed by a detailed investigation of sequential intermediate *** demonstrate that the glass-liquid phase transition of the initially dealloying metallic glasses,together with the synergistic effect of dealloying and ultrasound-driven ligament-breakage of small enough nanoporous intermediates,play key roles in preparing the uniformly dispersed metal and alloy *** approach greatly simplifies the up-scaling synthesis of monometallic and bimetallic nanoparticles,and also provides a general strategy for synthesizing unprecedented multimetallic nanoparticles.

关键词： Metallic glasses Dealloying Ultrasound Nanoparticles Multimetallic nanoparticles

Nucleation and growth of Fe-rich phases in Al-5Ti-1B modified Al-Fe alloys investigated using synchrotron X-ray imaging and electron microscopy

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Journal of Materials Science & Technology 2021年第21期80卷 84-99页

作者： Yuliang Zhao Weiwen Zhang Dongfu Song Bo Lin Fanghua Shen Donghai Zheng chunxiao xie Zhenzhong Sun Yanan Fu Runxia Li Neutron Scattering Technical Engineering Research Centre School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan University of TechnologyDongguan523808China National Engineering Research Centre of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou510641China Guangdong Institute of Materials and Processing Guangdong Acadamy of ScienceGuangzhou510650China School of Mechanical Engineering Guizhou UniversityGuiyang550025China Shanghai Synchrotron Radiation Facility.Shanghai Advanced Research Institute CASShanghai201204China School of Materials Science and Engineering Dongguan University of TechnologyDongguan523808China

Plate-like Fe-rich intermetallic phases directly influence the mechanical properties of recycled Al alloys;thus, many attempts have been made to modify the morphology of these phases. Through synchrotron X-ray imaging and electron microscopy, the underlying nucleation and growth mechanisms of Fe-rich phases during the solidification of Al-5 Ti-1 B-modified Al-2 Fe alloys were revealed in this study. The results showed that the Al-5 Ti-1 B grain refiner as well as the applied pressure both resulted in reduction of the size and number of primary Al_(3)Fe phases and promoted the formation of eutectic Al_(6)Fe *** tomography results demonstrated that Al-5 Ti-1 B changed the three-dimensional(3 D) morphology of primary Fe-rich phases from rod-like to branched plate-like, while a reduction in their thickness and size was also observed. This was attributed to the fact that Ti-containing solutes in the melts inhibit the diffusion of Fe atoms and the Al_(3)Fe twins produce re-entrant corner on the twin boundaries along the growth direction. Moreover, the TiB_(2) provides possible nucleation sites for Al_6Fe phases. The nucleation mechanism of Fe-rich phases is discussed in terms of experimental observations and crystallography calculations. The decrease in the lattice mismatch between TiB_(2) and Al_(6)Fe phases was suggested, which promoted the transformation of Al_(3)Fe to Al_(6)Fe phases.

关键词： Al alloys Synchrotron X-ray imaging Fe-rich phases Grain refinement Nucleation and growth

气相色谱——三重四极杆串联质谱法及高效液相色谱——串联质谱检法测定人参中禁用农药残留物

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广东化工 2024年第8期51卷 138-142,163页

作者：谢春晓陈海明陈小锐李程瑶余静怡广东省药品监督管理局事务中心广东广州510000 清远市食品药品检验所广东清远511517

目的:建立使用气相色谱-三重四极杆串联质谱法及高效液相色谱-串联质谱检法测定人参中禁用农药残留物的测定方法。方法:参照2020年版《中国药典》通则2341第五法4.1方式操作步骤,分别采用岛津气相色谱-串联质谱GC-MSTQ8040、高效液相色... 详细信息

目的:建立使用气相色谱-三重四极杆串联质谱法及高效液相色谱-串联质谱检法测定人参中禁用农药残留物的测定方法。方法:参照2020年版《中国药典》通则2341第五法4.1方式操作步骤,分别采用岛津气相色谱-串联质谱GC-MSTQ8040、高效液相色谱-串联质谱Waters XEVO TQMS进行检测分析。结果:对空白样品按低中高浓度分别加入混合对照品溶液500μL、1000μL、1500μL(添加浓度以灭线磷计分别为:0.04 mg/kg;0.08 mg/kg;0.12 mg/kg)后,按照文中前处理方法处理后,在岛津气相色谱-串联质谱GC-MSTQ8040上机,每个浓度平行3份样品考察回收率和RSD,结果显示,低中高浓度加标回收率分别为:86.83%~108.43%;91.39%~112.99%;88.47%~115.09%。,RSD分别为:0.54%~9.74%;2.24%~4.20%;1.07%~2.96%。回收率高,重现性好。对空白样品按低中高浓度分别加入混合对照品溶液500μL、1000μL、1500μL(添加浓度以灭线磷计分别为:0.1 mg/kg;0.2 mg/kg;0.3 mg/kg)后,按照文中前处理方法处理后,在高效液相色谱-串联质谱WatersXEVOTQMS上机,每个浓度平行3份样品考察回收率和RSD,结果显示,低中高浓度加标回收率分别为:74.33%~103.29%;72.55%~105.16%;81.54%~103.41%。RSD分别为:0.29%~6.01%;1.07%~8.32%;0.41%~7.74%。回收率高,重现性好。结论:该方法便捷,回收率和稳定性良好,适用于人参中禁用农药残留物的测定。

关键词：气相色谱-三重四极杆串联质谱法高效液相色谱-串联质谱检法禁用农药残留物直接提取法人参

代谢综合征与胰腺癌患者的临床病理特征和预后的相关性研究

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广西医科大学学报 2024年第1期41卷 78-84页

作者：谢春晓卢洁霞陈凤平韦大福石秋月覃山羽广西医科大学第一附属医院消化内科南宁530021

目的:探讨代谢综合征(MS)及其组分与胰腺癌患者临床病理特征的相关性和预后影响,为胰腺癌的综合防治、个性化诊疗提供理论参考。方法:回顾性分析2017年1月至2021年12月广西医科大学第一附属医院收治的184例胰腺癌患者的临床资料。根据M... 详细信息

目的:探讨代谢综合征(MS)及其组分与胰腺癌患者临床病理特征的相关性和预后影响,为胰腺癌的综合防治、个性化诊疗提供理论参考。方法:回顾性分析2017年1月至2021年12月广西医科大学第一附属医院收治的184例胰腺癌患者的临床资料。根据MS诊断标准,分为非MS组(144例)和MS组(40例)。比较两组临床病理特征。Cox回归模型分析未经抗癌治疗的49例患者预后的影响因素,Kaplan-Meier法分析MS及其组分与预后的关系。结果:与非MS组比较,MS组患者TNM分期晚,肿瘤远处转移发生率高(P0.05)。有无高血压、高甘油三酯(TG)、低HDL-C的患者之间的中位生存时间比较,差异均无统计学意义(均P>0.05)。结论:MS与胰腺癌患者的临床分期、肿瘤远处转移发生率相关,但尚不能证明是患者生存的影响因素,高血糖和超重分别是患者预后的独立危险因素和保护因素。

关键词：代谢综合征胰腺癌肿瘤分期预后

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Co/Ni比对FeCoNiCrZr非晶合金变温晶化行为的影响

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稀有金属材料与工程 2014年第6期43卷 1437-1440页

作者：谢春晓杨元政李文陈先朝谢致薇广东工业大学广东广州510006 东莞理工学院广东东莞523808

采用单辊急冷法制备了一系列不同Co／Ni比的FeCoNiCrZr非晶薄带，用Kissinger和Ozawa法研究Co／Ni比的变化对（Fe0.52Co0．48-xNix）73Cr17Zr10系非晶合金变温晶化行为的影响。结果表明：X在O．06～O．30变化时，所制备的合金薄带基本... 详细信息

采用单辊急冷法制备了一系列不同Co／Ni比的FeCoNiCrZr非晶薄带，用Kissinger和Ozawa法研究Co／Ni比的变化对（Fe0.52Co0．48-xNix）73Cr17Zr10系非晶合金变温晶化行为的影响。结果表明：X在O．06～O．30变化时，所制备的合金薄带基本上以非晶结构为主；随着Co／Ni比的增加，特征温度Tg、Tx、Tp均向高温区移动；由于不同升温速度下特征温度对应的晶化体积分数几乎不变，因而，采用Kissinger法与Ozawa法的计算结果非常接近，且都呈现Eg〉Ex〉Ep的规律；随着Ni含量的增加，Ex呈先增大后减小的趋势。合金的阶段晶化激活能反随晶化分数X的增加而逐渐下降。

关键词：非晶合金晶化行为激活能

The role of corneal endothelium in macular corneal dystrophy development and recurrence

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Science China(Life Sciences) 2024年第2期67卷 332-344页

作者： Bi-Ning Zhang Benxiang Qi chunxiao Dong Bin Zhang Jun Cheng Xin Wang Suxia Li Xiaoyun Zhuang Shijiu Chen Haoyun Duan Dewei Li Sujie Zhu Guoyun Li Yihai Cao Qingjun Zhou Lixin xie Eye Institute of Shandong First Medical University Qingdao Eye Hospital of Shandong First Medical UniversityQingdao 266071China State Key Laboratory Cultivation Base Shandong Provincial Key Laboratory of OphthalmologyQingdao 266071China School of Ophthalmology Shandong First Medical UniversityQingdao 250021China Department of Medicine Qingdao UniversityQingdao 266071China Eye Institute of Shandong First Medical University Eye Hospital of Shandong First Medical University(Shandong Eye Hospital)Jinan 250021China Department of Ophthalmology School of Clinical MedicineWeifang Medical UniversityWeifang 261072China Institute of Translational Medicine College of MedicineQingdao UniversityQingdao 266071China Key Laboratory of Marine Drugs of Ministry of Education Shandong Provincial Key Laboratory of Glycoscience and GlycotechnologySchool of Medicine and PharmacyOcean University of ChinaQingdao 266071China Laboratory for Marine Drugs and Bioproducts Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266071China Department of Microbiology Tumor and Cell BiologyBiomedicumKarolinska InstitutetStockholm 17177Sweden

Macular corneal dystrophy(MCD)is a progressive,bilateral stromal dystrophic disease that arises from mutations in carbohydrate sulfotransferase 6(CHST6).Corneal transplantation is the ultimate therapeutic solution for MCD ***,postoperative recurrence remains a significant *** conducted a retrospective review of a clinical cohort comprising 102 MCD patients with 124 eyes that underwent either penetrating keratoplasty(PKP)or deep anterior lamellar keratoplasty(DALK).Our results revealed that the recurrence rate was nearly three times higher in the DALK group(39.13%,9/23 eyes)compared with the PKP group(10.89%,11/101 eyes),suggesting that surgical replacement of the corneal endothelium for treating MCD is advisable to prevent postoperative *** experimental data confirmed the robust m RNA and protein expression of CHST6 in human corneal endothelium and the rodent homolog CHST5 in mouse *** knockdown of wild-type Chst5 in mouse corneal endothelium(AC^(siChst5)),but not in the corneal stroma,induced experimental MCD with similar extracellular matrix synthesis impairments and corneal thinning as observed in MCD *** carrying Chst5 point mutation also recapitulated clinical phenotypes of MCD,along with corneal endothelial *** injection of wild-type Chst5 rescued the corneal impairments in AC^(siChst5)mice and retarded the disease progression in Chst5 mutant ***,our study provides new mechanistic insights and therapeutic approaches for MCD treatment by highlighting the role of corneal endothelium in MCD development.

关键词： macular corneal dystrophy recurrence corneal endothelium keratan sulfate penetrating keratoplasty

室内环境中多溴联苯醚的污染特征和暴露风险研究进展

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环境化学 2019年第12期38卷 2736-2745页

作者：白春蕾解春宵李科北京工商大学环境科学与工程系

多溴联苯醚(polybrominated diphenyl ethers,PBDEs)是一类常见的溴代阻燃剂,具有生育毒性、生殖毒性以及致癌性等慢性毒性.作为典型的溴代阻燃剂,多溴联苯醚常被加入到各种产品中以提高产品的安全性,但在各种商业产品的使用过程中,多... 详细信息

多溴联苯醚(polybrominated diphenyl ethers,PBDEs)是一类常见的溴代阻燃剂,具有生育毒性、生殖毒性以及致癌性等慢性毒性.作为典型的溴代阻燃剂,多溴联苯醚常被加入到各种产品中以提高产品的安全性,但在各种商业产品的使用过程中,多溴联苯醚会不可避免地逸出至室内环境中,存在于空气或者灰尘中被人体摄入.研究表明,人类一生有80%—90%的时间处于室内环境中,因此,通过了解目前室内环境中多溴联苯醚的污染现状,进而评估通过室内环境暴露多溴联苯醚对人体的潜在危害极为重要.本文总结了室内环境中多溴联苯醚的浓度水平、组成特征以及人体暴露风险,并对未来的研究提出建议.

关键词：多溴联苯醚室内环境污染特征暴露风险

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Fe基大块非晶合金塑性的研究进展

材料导报 2012年第9期26卷 98-101页

作者：谢春晓杨元政广东工业大学材料与能源学院广州510006 东莞理工学院机械工程学院东莞523808

Fe基大块非晶合金因其优良的性能和成本优势已引起研究者的广泛关注,但脆性极大的缺陷阻碍其走向工程应用。综述了Fe基大块非晶合金塑性研究领域的最新进展,分析了其脆性产生的机理。介绍了目前常用的对Fe基大块非晶合金进行塑性增韧的... 详细信息

Fe基大块非晶合金因其优良的性能和成本优势已引起研究者的广泛关注,但脆性极大的缺陷阻碍其走向工程应用。综述了Fe基大块非晶合金塑性研究领域的最新进展,分析了其脆性产生的机理。介绍了目前常用的对Fe基大块非晶合金进行塑性增韧的方法,即成分设计法(微合金化)和添加第二相增韧法,提出了当前研究的重点。

关键词： Fe基大块非晶合金塑性微合金化第二相