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rationally designed synthesis of bright AgInS2/ZnS quantum dots with emission control

Nano research 2020年第9期13卷 2438-2450页

作者： Jose X.Soares K.David Wegner David S.M.ribeiro Armindo Melo Ines Hausler Joao L.M.Santos Ute resch-Genger LAQV-rEQUIMTE Department of Chemical SciencesLaboratory of Applied ChemistryFaculty of PharmacyUniversity of PortoRua de Jorge Viterboferreira228Porto4050-313Portugal federal Institute for Materials research and Testing(bam) Division BiophotonicsRichard-Willstaetter-Strasse 1112489 BerlinGermany LAQV-rEQUIMTE Laboratorio de Bromatologia e HidrologiaDepartamento de Ciencias QutmicasFaculdade de Farmacia da Universidade do PortoRua de Jorge Viterboferreira228Porto4050-313Portugal Technische Universitat Berlin Institutfiir Optik und Atomare PhysikStrafie des 17.Juni 13510623 BerlinGermany

In the blossoming field of Cd-free semiconductor quantum dots(QDs),ternary Ⅰ-Ⅲ-VI QDs have received increasing attention due to the ease of the environmentally friendly synthesis of high-quality materials in water,their high photoluminescence(PL)quantum yields(QYs)in the red and near infrared(NIr)region,and their inherently low ***,their oxygen-insensitive long PL lifetimes of up to several hundreds of nanoseconds close a gap for applications exploiting the compound-specific parameter PL *** overcome the lack of reproducible synthetic methodologies and to enable a design-based control of their PL properties,we assessed and modelled the synthesis of high-quality MPA-capped AglnS2/ZnS(AlS/ZnS)*** refined parameters included reaction time,temperature,Ag:In ratio,S:In ratio,Zn:In ratio,MPA:ln ratio,and pH using a design-of-experiment *** for the optimization was provided by mathematical models developed for the application-relevant PL parameters,maximum PL wavelength,QY,and PL lifetime as well as the elemental composition in terms of Ag:ln:Zn *** these experimental data-based models,MPA:ln and Ag:ln ratios and pH values were identified as the most important synthesis parameters for PL control and an insight into the connection of these parameters could be ***,the experimental conditions to synthetize QDs with tunable emission and high QY were *** excellent agreement between the predicted and experimentally found PL features confirmed the reliability of our methodology for the rational design of high quality AlS/ZnS QDs with defined PL *** approach can be straightforwardly extended to other ternary and quaternary QDs and to doped QDs.

关键词： quantum dot core/shell nanoparticle silver indium sulfide microw ave-assisted synthesis design of experim ent photoluminescence

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Uptake of citrate-coated iron oxide nanoparticles into atherosclerotic lesions in mice occurs via accelerated transcytosis through plaque endothelial cells

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Nano research 2016年第11期9卷 3437-3452页

作者： Wolfram C. Poller Evelyn ramberger Philipp Boehm-Sturm Susanne Mueller Konstantin Moller Norbert Lowa frank Wiekhorst Susanne Wagner Matthias Taupitz Eyk Schellenberger Gert Baumann Karl Stangl Verena Stangl Antje Ludwig Medizinische Klinik mit Schwerpunkt Kardiologie und Angiologie Charite-Universitatsmedizin Berlin Campus Mitte Chariteplatz 1 10117 Berlin Germany Abteilung fur Experimentelle Neurologie Center for Stroke Research Charite-Universitatsmedizin Berlin Chariteplatz 1 10117 Berlin Germany Charite Core facility '7 T experimental MrIs' Charite-Universitatsmedizin Berlin Chariteplatz 1 10117 Berlin Germany Physikalisch-Technische bundesanstalt Abbestr. 2-12 10587Berlin Germany Institut fur radiologie Charite-Universitatsmedizin Berlin Campus Mitte Charit@platz 1 10117 Berlin Germany DZHK (German Centre for Cardiovascular research) partner site Berlin 10115 Berlin Germany Berlin Institute of Health (BIH) 10117 Berlin Germany

Very small superparamagnetic iron oxide nanoparticles （VSOPs） rapidly accumulate in atherosclerotic lesions, thereby enabling plaque visualization by magnetic resonance imaging （MrI）. This study was performed to identify the uptake mechanisms of VSOPs into atherosclerotic plaques. Low-density lipoprotein receptor-deficient （LDLr^-/-） mice with advanced atherosclerosis were analyzed using MrI and transmission electron microscopy （TEM） at various time points after intravenous administration of VSOPs. Post-mortem MrI detected VSOP labeling of atherosclerotic plaques 10 min after injection, and the signal increased over the first 3 h. TEM revealed that the intensive plaque labeling was mediated by accelerated transcytosis of VSOPs through endothelial cells overlaying atherosclerotic lesions. Experiments with endocytosis inhibitors and small interfering rNA （sirNA） revealed a dynamin-dependent mechanism involving both clathrin- and caveolin-mediated processes. In cell culture experiments, endothelial VSOP uptake was enhanced under proatherogenic flow and TNfα stimulation, conditions that are both present in plaque areas. Our study demonstrates that VSOPs enable non-invasive MrI assessment of accelerated endothelial transcytosis, an important pathomechanism in atherosclerotic plaque formation.

关键词： atherosclerosis,unstable plaques,magnetic resonanceimaging decreased endothelial barrier function,superparamagnetic ironoxide nanoparticles

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计量软件溯源中的TraCIM软件认证系统

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工具技术 2017年第12期51卷 118-121页

作者：汤洁 frank Hrtig 石照耀北京工业大学北京市精密测控技术与仪器工程技术研究中心 Physikalisch-Technische bundesanstalt Braunschweig und Berlin(PTB)

工业计量领域、校准实验室和计量研究机构均需要一致的计算溯源框架以对计量软件进行溯源。计量软件溯源主要是对其算法进行溯源,并与其特定的计算目标相关联。德国国家计量院(PTB)推出了国际计量软件认证系统(TraCIM)实施计量软件溯源... 详细信息

工业计量领域、校准实验室和计量研究机构均需要一致的计算溯源框架以对计量软件进行溯源。计量软件溯源主要是对其算法进行溯源,并与其特定的计算目标相关联。德国国家计量院(PTB)推出了国际计量软件认证系统(TraCIM)实施计量软件溯源,国际软件认证包括高斯(Gauss)软件认证、切比雪夫(Chebyshev)软件认证和比对(Comparison)软件认证。TraCIM计量软件认证通过在专用网络平台上实施"认证用户—服务器"间的应用来实现。认证流程主要包括索要标准输入数据、提交结果和获得认证报告。计量领域企业三丰(Mitutoyo)、蔡司(Zeiss)均实施并通过认证。

关键词：软件认证 TraCIM 软件溯源国际比对标准数据

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