Bibliografías temáticas / Nanoparticles, Upconversion, Nanothermometry, Lanthanides

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Literatura académica sobre el tema "Nanoparticles, Upconversion, Nanothermometry, Lanthanides"

Autor: Grafiati

Publicado: 11 de marzo de 2023

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Artículos de revistas sobre el tema "Nanoparticles, Upconversion, Nanothermometry, Lanthanides"

Vetrone, Fiorenzo. "(Invited) Multi-Architectured Lanthanide Doped Nanoparticles for Theranostics". ECS Meeting Abstracts MA2022-01, n.º 53 (7 de julio de 2022): 2210. http://dx.doi.org/10.1149/ma2022-01532210mtgabs.

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Light triggered theranostic (therapy and diagnostic) nanoplatforms have gained a considerable attention in recent years. In theranostics, light as an external trigger stands out due to its non-invasiveness, high local precision and temporal resolution. Many such nanoplatforms employ high-energy (visible or UV) light to initiate the individual therapeutic and diagnostic modalities. However, light at these wavelengths suffers from inherent drawbacks such as having little to no penetration in living tissue, inducing autofluorescence from inherent fluorophores or chromophores in tissues and causing photodamage. The use of near-infrared (NIR) light for excitation mitigates such drawbacks associated with high-energy excitation, for example, little to no background autofluorescence from the specimen under investigation as well as no incurred photodamage. Moreover, one of the biggest limitations is that of penetration and NIR light can penetrate tissues much better than high-energy light especially when these wavelengths lie within the three biological windows where tissues are optically transparent. At the forefront of NIR excited nanomaterials are lanthanide doped nanoparticles, which can undergo conventional (Stokes) luminescence and emit in the NIR biological windows. However, unlike other classes of nanoparticles, they can also undergo a multiphoton excitation process where the NIR excitation light is converted to higher energies resulting in anti-Stokes luminescence spanning the UV-visible-NIR regions (known as upconversion). Thus, it now becomes possible to generate upconverted high-energy light (UV or visible) in situ to trigger other light activated therapeutic modalities (i.e. drug release) while using the NIR emission for diagnostics (i.e. bioimaging, nanothermometry). Here, we demonstrate how the luminescence properties (upconversion and NIR) of various lanthanide doped core/shell (and multishell) nanoparticles can be exploited for potential use in theranostics.

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Zheng, Shuhong, Weibo Chen, Dezhi Tan, Jiajia Zhou, Qiangbing Guo, Wei Jiang, Cheng Xu, Xiaofeng Liu y Jianrong Qiu. "Lanthanide-doped NaGdF4 core–shell nanoparticles for non-contact self-referencing temperature sensors". Nanoscale 6, n.º 11 (2014): 5675–79. http://dx.doi.org/10.1039/c4nr00432a.

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Li, Hao, Esmaeil Heydari, Yinyan Li, Hui Xu, Shiqing Xu, Liang Chen y Gongxun Bai. "Multi-Mode Lanthanide-Doped Ratiometric Luminescent Nanothermometer for Near-Infrared Imaging within Biological Windows". Nanomaterials 13, n.º 1 (3 de enero de 2023): 219. http://dx.doi.org/10.3390/nano13010219.

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Owing to its high reliability and accuracy, the ratiometric luminescent thermometer can provide non-contact and fast temperature measurements. In particular, the nanomaterials doped with lanthanide ions can achieve multi-mode luminescence and temperature measurement by modifying the type of doped ions and excitation light source. The better penetration of the near-infrared (NIR) photons can assist bio-imaging and replace thermal vision cameras for photothermal imaging. In this work, we prepared core–shell cubic phase nanomaterials doped with lanthanide ions, with Ba2LuF7 doped with Er3+/Yb3+/Nd3+ as the core and Ba2LaF7 as the coating shell. The nanoparticles were designed according to the passivation layer to reduce the surface energy loss and enhance the emission intensity. Green upconversion luminescence can be observed under both 980 nm and 808 nm excitation. A single and strong emission band can be obtained under 980 nm excitation, while abundant and weak emission bands appear under 808 nm excitation. Meanwhile, multi-mode ratiometric optical thermometers were achieved by selecting different emission peaks in the NIR window under 808 nm excitation for non-contact temperature measurement at different tissue depths. The results suggest that our core–shell NIR nanoparticles can be used to assist bio-imaging and record temperature for biomedicine.

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Liu, Huiming, Long Yan, Jinshu Huang, Zhengce An, Wang Sheng y Bo Zhou. "Ultrasensitive Thermochromic Upconversion in Core–Shell–Shell Nanoparticles for Nanothermometry and Anticounterfeiting". Journal of Physical Chemistry Letters 13, n.º 10 (4 de marzo de 2022): 2306–12. http://dx.doi.org/10.1021/acs.jpclett.2c00005.

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Lin, Mei, Liujing Xie, Zijun Wang, Bryce S. Richards, Guojun Gao y Jiuping Zhong. "Facile synthesis of mono-disperse sub-20 nm NaY(WO4)2:Er3+,Yb3+ upconversion nanoparticles: a new choice for nanothermometry". Journal of Materials Chemistry C 7, n.º 10 (2019): 2971–77. http://dx.doi.org/10.1039/c8tc05669b.

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Halubek-Gluchowska, Katarzyna, Damian Szymański, Thi Ngoc Lam Tran, Maurizio Ferrari y Anna Lukowiak. "Upconversion Luminescence of Silica–Calcia Nanoparticles Co-doped with Tm3+ and Yb3+ Ions". Materials 14, n.º 4 (16 de febrero de 2021): 937. http://dx.doi.org/10.3390/ma14040937.

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Looking for upconverting biocompatible nanoparticles, we have prepared by the sol–gel method, silica–calcia glass nanopowders doped with different concentration of Tm3+ and Yb3+ ions (Tm3+ from 0.15 mol% up to 0.5 mol% and Yb3+ from 1 mol% up to 4 mol%) and characterized their structure, morphology, and optical properties. X-ray diffraction patterns indicated an amorphous phase of the silica-based glass with partial crystallization of samples with a higher content of lanthanides ions. Transmission electron microscopy images showed that the average size of particles decreased with increasing lanthanides content. The upconversion (UC) emission spectra and fluorescence lifetimes were registered under near infrared excitation (980 nm) at room temperature to study the energy transfer between Yb3+ and Tm3+ at various active ions concentrations. Characteristic emission bands of Tm3+ ions in the range of 350 nm to 850 nm were observed. To understand the mechanism of Yb3+–Tm3+ UC energy transfer in the SiO2–CaO powders, the kinetics of luminescence decays were studied.

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Xu, Hanyu, Mochen Jia, Zhiying Wang, Yanling Wei y Zuoling Fu. "Enhancing the Upconversion Luminescence and Sensitivity of Nanothermometry through Advanced Design of Dumbbell-Shaped Structured Nanoparticles". ACS Applied Materials & Interfaces 13, n.º 51 (15 de diciembre de 2021): 61506–17. http://dx.doi.org/10.1021/acsami.1c17900.

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Ferrera-González, Juan, Laura Francés-Soriano, Cristina Galiana-Roselló, Jorge González-Garcia, María González-Béjar, Eleonore Fröhlich y Julia Pérez-Prieto. "Initial Biological Assessment of Upconversion Nanohybrids". Biomedicines 9, n.º 10 (9 de octubre de 2021): 1419. http://dx.doi.org/10.3390/biomedicines9101419.

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Nanoparticles for medical use should be non-cytotoxic and free of bacterial contamination. Upconversion nanoparticles (UCNPs) coated with cucurbit[7]uril (CB[7]) made by combining UCNPs free of oleic acid, here termed bare UCNPs (UCn), and CB[7], i.e., UC@CB[7] nanohybrids, could be used as photoactive inorganic-organic hybrid scaffolds for biological applications. UCNPs, in general, are not considered to be highly toxic materials, but the release of fluorides and lanthanides upon their dissolution may cause cytotoxicity. To identify potential adverse effects of the nanoparticles, dehydrogenase activity of endothelial cells, exposed to various concentrations of the UCNPs, was determined. Data were verified by measuring lactate dehydrogenase release as the indicator of loss of plasma membrane integrity, which indicates necrotic cell death. This assay, in combination with calcein AM/Ethidium homodimer-1 staining, identified induction of apoptosis as main mode of cell death for both particles. The data showed that the UCNPs are not cytotoxic to endothelial cells, and the samples did not contain endotoxin contamination. Higher cytotoxicity, however, was seen in HeLa and RAW 264.7 cells. This may be explained by differences in lysosome content and particle uptake rate. Internalization of UCn and UC@CB[7] nanohybrids by cells was demonstrated by NIR laser scanning microscopy.

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Yang, Han Yu. "Lanthanide-Based Nanoprobes for Time-Resolved Luminescence Imaging on Various Ions and Molecules". Materials Science Forum 1075 (30 de noviembre de 2022): 9–17. http://dx.doi.org/10.4028/p-76fds1.

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Lanthanide-doped upconversion nanoparticles (Ln-UCNPs) have been extensively explored in the biological field. In particular, Ln-UCNPs with near-infrared (NIR) fluorescence have tremendous potential for biological imaging because of their outstanding photo-and chemo-stability, extended photoluminescence lifetimes, low long-term toxicities and narrow photoluminescence bandwidths as well as minimal background interferences. Using predesigned energy transfer routes makes it possible to get upconversion luminescence from lanthanides' 4f-4f optical transitions. This article clarifies the key working principles and superiorities of Ln-UCNPs for bioimaging. A crucial overview of recent advances in biological detection adopting lanthanide-based luminescence resonance energy transfer (LRET) mechanisms is presented while emphasizing the importance of modifying Ln-UCNPs to obtain a more efficient energy transfer mechanism.

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Rostami, Iman. "Empowering the Emission of Upconversion Nanoparticles for Precise Subcellular Imaging". Nanomaterials 11, n.º 6 (11 de junio de 2021): 1541. http://dx.doi.org/10.3390/nano11061541.

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Upconversion nanoparticles (UCNPs) are a class of inorganic fluorophores that follow the anti-Stokes mechanism, to which the wavelength of emission is shorter than absorption. This unique optical behavior generates relatively long-lived intermediate energy levels of lanthanides that stabilize the excitation state in the fluorescence process. Longer-wavelength light sources, e.g., near-infrared (NIR), penetrate deeper into biological materials such as tissue and cells that provide a larger working space for cell biology applications and imaging, whereby UCNPs have recently gained increasing interest in medicine. In this report, the emission intensity of a gadolinium-based UCNP was screened by changing the concentrations of the constituents. The optimized condition was utilized as a luminescent nanoprobe for targeting the mitochondria as a distinguished subcellular organelle within differentiated neuroblastoma cells. The main goal of this study is to illustrate the targeting process within the cells in a native state using modified UCNPs. Confocal microscopy on the cells treated with the functionalized UCNPs indicated a selective accumulation of UCNPs after immunolabeling. To tackle the insolubility of as-synthesized particles in water-based media, the optimized UCNPs were surface-coated with polyamidoamine (PAMAM) dendrimers that due to peripheral amino groups are suitable for functionalizing with peptides and antibodies. Ultimately, we concluded that UCNPs are potentially versatile and ideal tools for NIR bioimaging and capable of making adequate contrast against biomaterials to be detectable in electron microscopy (EM) imaging.

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Tesis sobre el tema "Nanoparticles, Upconversion, Nanothermometry, Lanthanides"

Lucchini, Giacomo. "EXPLOITING TRANSITION METAL AND LANTHANIDE IONS AS DOPANTS IN OXIDE AND FULORIDE NANOPARTICLES FOR NANOTHERMOMETRY AND BROAD BAND OPTICAL SENSITIZATION". Doctoral thesis, 2019. http://hdl.handle.net/11562/993780.

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Lanthanide activated nanoparticles are an important class of nanomaterials with unique properties and useful functionalities for a wide range of applications in na-nomedicine such as optical imaging, magnetic resonance imaging (MRI), nanother-mometry and theranostics. In this thesis some new lanthanide activated, fluoride or oxide nanoparticles for nanomedicine have been investigated. In particular, their synthesis, chemico-physical characterization and spectroscopic properties have been carried out. Two new nanothermometers have been developed through proper lanthanide doping and core@shell architecture, exploiting the peculiar energy level scheme of the lanthanide ions. The obtained nanomaterials show good thermal sen-sitivity, using both excitation and emission radiation in the near infrared biological windows, suggesting their possible use for in-vivo applications. One nanothermom-eter is based on the upconversion emission of Eu3+ ions sensitized by Yb3+ and Tm3+ ions as dopants in SrF2 nanoparticles. The other investigated nanothermometer is based on the excitation from thermally excited Stark levels of Nd3+ ions present as dopants in KY3F10 nanoparticles. Cr3+ and Yb3+ co-doped fluoride and oxide nanoparticles have been synthesized in order to sensitize the Yb3+ ions in a wide optical region, exploiting the Cr3+ absorp-tion and possible energy transfer to Yb3+ ions. Fluoride based NaSrAlF6:Cr3+, Yb3+ nanoparticles have been obtained and upon a excitation in the red region (around 650 nm) they show a strong Cr3+ emission in the NIR range (around 800 nm) but no Yb3+ ions emission was observed. On the other hand, for the ZnWO4:Cr3+, Yb3+ nanoparticles, that have been obtained and properly characterized, a strong Yb3+ emission around 980 nm is observed on exciting in the absorption range of Cr3+ (for this host around 750 nm), due to efficient Cr3+ → Yb3+ energy transfer. The spec-troscopic results show that the ZnWO4:Cr3+, Yb3+ nanoparticles are good candidates for upconversion emission with broad NIR excitation.

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Rinkel, Thorben. "Untersuchung der Keimbildung und Fluoreszenz von NaYF4:Yb,Er-Nanopartikeln mit Größen von unter 10nm". Doctoral thesis, 2016. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2016021814264.

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In dieser Arbeit ist das Wachstumsverhalten von unter 10nm großen, aufwärtskonvertierenden NaYF4-Nanokristallen der hexagonalen und kubischen Phase untersucht worden. Die Ostwald-Reifung solcher Partikel in Ölsäure/1-Octadecen führt zu einer Verbreiterung der Partikelgrößenverteilung, falls das Kolloid nur aus Partikeln einer Kristallphase besteht. Eine schmale Teilchengrößenverteilung tritt nur dann auf, wenn die Partikel der b-Phase in Anwesenheit eines Überschusses von Partikeln der a-Phase wachsen. Solche binären Gemische aus Partikeln der a- und b-Phase entstehen, sobald Kolloide aus Partikeln der a-Phase für eine genügend lange Zeit erhitzt werden, denn bei hohen Temperaturen nukleieren Keime der b-Phase nach einer gewissen Zeit. Weil durch die Anzahl der Keime die finale Partikelgröße des Produkts der b-Phase bestimmt wird, ist eine Kontrolle der Nukleation wichtig um die finale Partikelgröße steuern zu können. Es wird gezeigt, dass die Anzahl der Keime der b-Phase stark abhängig von der Zusammensetzung der Partikel der a-Phase ist, die als Ausgangsmaterial verwendet werden. Die a-Phase ist dafür bekannt Na1−xYF4−x-Mischkristalle mit Zusammensetzungen von x=0 bis x=4/9 zu bilden. Bei natriumarmen Partikeln der a-Phase entstehen eine geringe Anzahl an Keimen der b-Phase, wobei Partikel der a-Phase mit einem hohen Gehalt an Natrium eine große Anzahl an Keimen bilden. Durch die Ausnutzung dieser Abhängigkeit und der dementsprechenden Modifizierung der Synthese der Partikel der a-Phase, können in Ölsäure/1-Octadecen kleine, phasenreine b-NaYF4:Yb,Er-Partikel mit Größen von unter 6 nm, sowohl als auch deutlich größere Partikel erhalten werden. Weiterhin wird gezeigt, dass Mischungen von a- und b-Partikeln auch sehr gut für die Synthese von Kern/Schale-Partikeln geringer Größe geeignet sind. Durch die Reaktion von Natriumoleat, Seltenerdoleat und Ammoniumfluorid werden zunächst etwa 5nm große b-NaYF4:Yb,Er-Kernpartikel gebildet, wobei ein hohes Verhältnis von Natrium- zu Seltenerdionen die Nukleation einer großen Anzahl von Keimen der b-Phase begünstigt. Anschließend wird eine etwa 2nm dicke Schale aus b-NaYF4 aufgewachsen, wobei 3–4nm große a-NaYF4-Partikel als Vorläuferpartikel für das Schalenmaterial dienen. Im Gegensatz zu den Kernpartikeln werden diese Partikel der a-Phase jedoch mit einem geringen Verhältnis von Natrium- zu Seltenerdionen hergestellt, welches die unerwünschte Nukleation von b-NaYF4-Partikeln während des Schalenwachstums wirksam unterdrückt. Diese neue Methode zur Herstellung sehr kleiner aufwärtskonvertierender Kern/Schale-Nanokristalle kommt ohne zusätzliche Kodotierung der Kernpartikel aus und liefert Partikel im Gramm-Maßstab.

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Actas de conferencias sobre el tema "Nanoparticles, Upconversion, Nanothermometry, Lanthanides"

Dos Santos, L. F., J. C. Martins, K. O. Lima, L. F. T. Gomes, M. T. de Melo, A. C. Tedesco, L. D. Carlos, R. A. S. Ferreira y R. R. Gonçalves. "In vitro assays and nanothermometry studies of infrared-to- visible upconversion of nanocrystalline Er3+,Yb3+ co-doped Y2O3 nanoparticles for theranostic applications". En Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.tu4a.34.

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Luminescent spherical and monodisperse Er3+, Yb3+ co-doped Y2O3 nanoparticles were synthesized by homogenous precipitation followed by annealing. These nanoparticles exhibits high cell viability. On the basis of luminescence nanotermometry, the nanoparticles exhibits features of primary thermometer with high thermal sensitivity.

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