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Littérature scientifique sur le sujet « NPs anisotropiche »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "NPs anisotropiche"

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Kerr, Melissa A., and Fei Yan. "Bromide-Assisted Anisotropic Growth of Gold Nanoparticles as Substrates for Surface-Enhanced Raman Scattering." Journal of Spectroscopy 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3164247.

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We report herein a one-step synthesis of gold nanoparticles (Au NPs) of various shapes such as triangles, hexagons, and semispheres, using 5-hydroxyindoleacetic acid (5-HIAA) as the reducing agent in the presence of potassium bromide (KBr). Anisotropic Au NPs have received ever-increasing attention in various areas of research due to their unique physical and chemical properties. Numerous synthetic methods involving either top-down or bottom-up approaches have been developed to synthesize Au NPs with deliberately varied shapes, sizes, and configurations; however, the production of templateless, seedless, and surfactant-free singular-shaped anisotropic Au NPs remains a significant challenge. The concentrations of hydrogen tetrachloroaurate (HAuCl4), 5-HIAA, and KBr, as well as the reaction temperature, were found to influence the resulting product morphology. A detailed characterization of the resulting Au NPs was performed using ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and Raman spectroscopy. The as-prepared Au NPs exhibited excellent surface-enhanced Raman scattering (SERS) properties, which make them very attractive for the development of SERS-based chemical and biological sensors.

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Fan, Jun-Bing, Yongyang Song, Hongfu Li, Jin-Peng Jia, Xinglin Guo, and Lei Jiang. "Controllable drug release and effective intracellular accumulation highlighted by anisotropic biodegradable PLGE nanoparticles." J. Mater. Chem. B 2, no. 25 (2014): 3911–14. http://dx.doi.org/10.1039/c3tb21726d.

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Zheng, Zijian, Jianxiang Shen, Jun Liu, Youping Wu, Liqun Zhang, and Wenchuan Wang. "Tuning the visco-elasticity of elastomeric polymer materials via flexible nanoparticles: insights from molecular dynamics simulation." RSC Advances 6, no. 34 (2016): 28666–78. http://dx.doi.org/10.1039/c6ra01827k.

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Galtier, S. "Wave turbulence in magnetized plasmas." Nonlinear Processes in Geophysics 16, no. 1 (2009): 83–98. http://dx.doi.org/10.5194/npg-16-83-2009.

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Abstract. The paper reviews the recent progress on wave turbulence for magnetized plasmas (MHD, Hall MHD and electron MHD) in the incompressible and compressible cases. The emphasis is made on homogeneous and anisotropic turbulence which usually provides the best theoretical framework to investigate space and laboratory plasmas. The solar wind and the coronal heating problems are presented as two examples of application of anisotropic wave turbulence. The most important results of wave turbulence are reported and discussed in the context of natural and simulated magnetized plasmas. Important issues and possible spurious interpretations are also discussed.

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Treumann, R. A., and W. Baumjohann. "Brief Communication: Weibel, Firehose and Mirror mode relations." Nonlinear Processes in Geophysics 21, no. 1 (2014): 143–48. http://dx.doi.org/10.5194/npg-21-143-2014.

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Abstract. Excitation of Weibel magnetic fields in an initially non-magnetized though anisotropic plasma may trigger other low-frequency instabilities fed by pressure anisotropy. It is shown that under Weibel-like stable conditions the Weibel-like thermal fluctuation magnetic field allows for restricted Firehose-mode growth. In addition, low-frequency Whistlers can also propagate in the plasma under certain anisotropic conditions. When the Weibel-like mode becomes unstable, Firehose instability ceases but Mirror modes take over. This will cause bubble structures in the Weibel-like field in addition to filamentation.

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Park, Byung Hyun, Ji Hyun Lee, Jae Hwan Jung, Seung Jun Oh, Doh C. Lee, and Tae Seok Seo. "A centrifuge-based stepwise chemical loading disc for the production of multiplex anisotropic metallic nanoparticles." RSC Advances 5, no. 3 (2015): 1846–51. http://dx.doi.org/10.1039/c4ra13778g.

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Osipov, Aleksander Aleksandrovich, and Denis Anatolievich Skobeev. "Liquid metal technology of synthesis of ALOOH anisotropic nanostructured aerogel." Izvestiya Wysshikh Uchebnykh Zawedeniy, Yadernaya Energetika 2016, no. 4 (2016): 91–101. http://dx.doi.org/10.26583/npe.2016.4.09.

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Wang, Xujie, Zhenlong Dou, Chi Zhang, et al. "Polarization-controlled anisotropy in hybrid plasmonic nanoparticles." Nanophotonics 11, no. 5 (2022): 1003–9. http://dx.doi.org/10.1515/nanoph-2021-0691.

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Abstract Anisotropy has played a critical role in many material systems, but its controllable creation and modulation have been a long-lasting challenge for the scientific communities. Polarization-addressed anisotropy appears more attractive among all approaches due to its excellent controllability, simplicity, and accuracy, but only a limited number of material systems are applicable for such a concept, which are largely focused on oriented growth. Here, we establish a polarization-dependent anisotropic etching system made of Au@oligomer core–shell nanoparticles (NPs). As the oligomer coatings can be photochemically degraded via two-photon photolithography, the plasmonic near-field enhancement supported by the Au NP cores renders much faster degradation of the oligomer shells along the polarization, resulting in anisotropic Au@oligomer hybrid NPs. Such shape anisotropy leads to polarization-dependent photoluminescence with embedded dyes of methylene blue, which can be used as single-particle-based polarization detector. The oligomer lobes capped at the sides of the Au NP can also function as a protection agent for anisotropic photochemical growth of Au NPs, which evolve into Au nanorods and mushrooms with controlled irradiation time. Such polarization-directed etching of oligomer shells has unique advantages of high local-selectivity, controllability, and versatility for on-chip nanofabrication, which opens many new opportunities for integrated nanophotonic devices.

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Pandey, Puran, Mao Sui, Ming-Yu Li, Quanzhen Zhang, Eun-Soo Kim, and Jihoon Lee. "Shape transformation of self-assembled Au nanoparticles by the systematic control of deposition amount on sapphire (0001)." RSC Advances 5, no. 81 (2015): 66212–20. http://dx.doi.org/10.1039/c5ra07631e.

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The shape and size dependent optical, physical and chemical properties of isotropic and anisotropic gold nanoparticles (Au NPs) have attracted significant research interest for their application in various optoelectronic devices.

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Antonova, I. V., D. V. Marin, Vladimir A. Volodin, V. A. Skuratov, J. Jedrzejewski, and I. Balberg. "Anisotropic Strain – Anisotropic Heating Engineering for Silicon Nanocrystals in SiO₂." Solid State Phenomena 156-158 (October 2009): 523–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.156-158.523.

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In the present paper we discuss effects due to high-energy ion bombardment of SiO2 layers with embedded Si nanocrystals (NCs), such as the formation of new Si NCs in such layers, amorphization of previously existing NCs, modification of NC size distribution, and modification of optical and electrical properties of NCs. These effects are identified as resulting from anisotropic strain - anisotropic heating in NCs-SiO2 layers under ion irradiation.

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Thèses sur le sujet "NPs anisotropiche"

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GIUSTRA, MARCO DAVIDE. "Synthesis of multi-branched polymers for the stabilization of metallic nanoparticles." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/366171.

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È fondamentale progettare e monitorare tutte le fasi preparative di un sistema di drug delivery in modo tale da raggiungere un determinato sito bersaglio. Ogni parte di un nanocarrier influenza sé stesso e l'ambiente circostante. Inoltre, per ottenere campioni monodispersi, il rivestimento e le eventuali funzionalizzazioni sono fondamentali per determinare la stabilità colloidale, prevedere il comportamento in un sistema biologico e raggiungere il target di interesse. In particolar modo, la razionalizzazione dei meccanismi di internalizzazione e la quantificazione dei carrier nei siti intracellulari è ancora oggi un tema di grande interesse in ambito nanomedico. In questo lavoro, è stata presentata una classe di polimeri multidentati di facile sintesi mostrando un'ampia applicabilità in combinazione con nanoparticelle (NPs) metalliche. I polimeri multidentati sono stati coinvolti in tre diversi progetti. Il primo progetto mirava a presentare un polimero multidentato come modello generale da applicare nel rivestimento di superfici metalliche. Per dimostrarlo sono stati effettuati diversi test prendendo in considerazione la composizione e la dimensione delle NPs. Questo polimero è stato confrontato con altri due tipi di rivestimenti comuni in letteratura. I dati ottenuti mostrano come il nuovo rivestimento fornisca una maggiore stabilità colloidale. In secondo luogo, sono stati ottenuti miglioramenti dal punto di vista della tossicità e della bio-funzionalizzazione. Nel secondo progetto, la catena polimerica è stata modificata con un altro ligando per ampliare il campo di applicazione di questi polimeri. La scelta della molecola è basata sull'affinità per alcune superfici metalliche. In questo caso la molecola scelta è il 4-amminotiofenolo, spesso utilizzata per applicazioni SERS. Inizialmente, il polimero è stato studiato rivestendo diversi tipi di NPs metalliche (oro e argento) e sono state eseguite analisi SERS. Le dimensioni e la forma hanno giocato un ruolo chiave, in particolare con le nanoparticelle cubiche concave risultando promettenti agenti diagnostici. Nella seconda parte del progetto, le nanoparticelle cubiche d'argento sono state utilizzate come modello per la valutazione del traffico cellulare e della maturazione endosomiale. Dei test preliminari sono stati effettuati a diversi pH (per emulare le variazioni di pH nelle fasi evolutive dell'endosoma) e studi in vitro sono stati eseguiti per verificare l'uptake delle NPs nelle cellule HeLa. Il terzo progetto mirava a utilizzare il polimero sintetizzato come precursore nella sintesi di nanoparticelle anisotropiche. La forma ottenuta inizialmente è stata quella di un petalo, ma aumentando la temperatura, i petali si sono assemblati a nanofiori con un diametro al di sopra di 100 nm. La presenza del polimero SERS-attivo rende queste nanoparticelle ottimi candidati per questa tipologia di applicazione.<br>Designing and monitoring all the preparation steps of a drug delivery system is essential to achieve a specific target. Each part of a nanocarrier affects the batch itself and the surrounding environment. In addition, to obtain monodispersed samples, the coating and any functionalization are crucial to determine the colloidal stability, to predict the behavior with a biological system, and the reaching of the target site. In particular, the achievement of intracellular sites by rationalizing the internalization mechanisms and quantifying the carriers in the target is still today a hot topic in the nanomedical field. Here, a class of multidentate polymers was presented: a simple way to synthesize them and show their broad applicability in combination with metal NPs. Multi-branched polymers were involved in three projects. The first project aimed to present a multidentate polymer as a general model to be applied in the coating of metal surfaces. To prove this, several tests were carried out by modulating the composition and size of the NPs. This easily synthesized polymer has been compared with two types of coatings common in literature. The obtained data show how the new surfactant provides high colloidal stable nanoparticles. Secondly, this leads to improvements from the point of view of toxicity and bio-functionalization. In the second project, the ligands polymer chain was modified to increase the range of application. Moreover, the choice of the ligand was based on the affinity for certain metal surfaces. In this case, the molecule is 4-aminotiophenol which is often used for SERS applications. Initially, the versatility of the polymer was investigated by coating different types of metallic NPs (gold and silver) and then SERS analyses were performed. Size and shape played a key role, especially with cubic concave nanoparticles that are promising for diagnostics application. In the second part of the project, cubic silver nanoparticles were used as a model for the evaluation of cell trafficking and endosomal maturation. Preliminary tests of NPs have been carried out at different pH (to emulate the pH variations in the endosomal evolution stages) and in vitro studies to check the nanoparticles uptake in HeLa cells were performed. The third project aimed to use the designed polymer as precursor in the synthesis of anisotropic nanoparticles. The shape obtained is a petal form. Subsequently, with the increase of the temperature, the petals assembled to nanoflowers above 100 nm. The presence of the active SERS polymer makes these nanoparticles, excellent candidates for this application.

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Fernandez, Fernando Ferreira. "Análise da influência da rugosidade nas deformações limites de chapas metálicas finas e anisotropicas na região de estiramento." Instituto Tecnológico de Aeronáutica, 1994. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1698.

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Este trabalho estuda a influência da rugosidade superficial nas deformações limites. Um modelo matemático capaz de predizer a estricção localizada é apresentado, sendo considerado aqui como um limite superior de deformação no processo de estiramento de chapas metálicas finas e anisotrópicas. O modelo teórico assume que a rugosidade superficial pode ser representada por uma distribuição senoidal. Operações de estiramento foram realizadas através de embutimento com punção esférico e por um novo ensaio de tração biaxial proposto. Antes de realizar os ensaios, grelhas de círculos foram impressos nos CDP';s através de técnica fotográfica, possibilitando a realização das medidas de deformações até a estricção local. Os ensaios foram realizados com as ligas de alumínio 2024-O e 7475-O. Os resultados experimentais do presente trabalho, junto com dados teóricos e experimentais de outros autores são analisados e comparados, onde os resultados obtidos estão em boa concordância. Fica claro, a partir deste trabalho que as deformações limites são sensíveis à rugosidade superficial da chapa metálica submetida a operações de estiramento. Outros parâmetros relevantes ao processo são também discutidos.

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Sousa, Vinícius da Silva Ramos de. "O efeito magnetocalórico anisotrópico nos compostos RAl2 (R = Dy, Er, Ho, Nd, Tb)." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=817.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>SOUSA, Vinícius da Silva Ramos de. O efeito magnetocalórico anisotrópico nos compostos RAl2 (R = Dy, Er, Ho, Nd e Tb). 2008. 99f. Dissertação (Mestrado em Física) - Instituto de Física Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, 2008. O efeito magnetocalórico é a base da refrigeração magnética. O potencial magnetocalórico é caracterizado por duas quantidades termodinâmicas: a variação isotérmica da entropia (ΔSiso) e a variação adiabática da temperatura (ΔTad), as quais são calculadas sob uma variação na intensidade do campo magnético aplicado ao sistema. Em sistemas magnéticos que apresentam uma anisotropia magnética é observada uma mudança no efeito magnetocalórico, isto porque este potencial torna-se fortemente dependente da direção de aplicação do campo magnético. A anisotropia em sistemas magnéticos pode levar a um efeito magnetocalórico inverso, assim como à definição de um efeito magnetocalórico anisotrópico, o qual por definição é calculado para um campo cuja intensidade é mantida constante e cuja orientação variamos de uma direção difícil de magnetização para a direção fácil de magnetização. O efeito magnetocalórico anisotrópico foi estudado para os compostos intermetálicos de terras raras do tipo RAl2 considerando-se um modelo microscópico que leva em conta as interações de troca (na aproximação de campo médio), de Zeeman e a interação de campo elétrico cristalino, que é a responsável pela anisotropia nos compostos RAl2. O efeito magnetocalórico anisotrópico foi investigado para a série RAl2 e comparado com o efeito magnetocalórico usual.<br>The magnetic refrigeration is based on the magnetocaloric effect. The magnetocaloric potential is characterized by the two thermodynamics quantities: the isothermal entropy change (ΔSiso) and the adiabatic temperature change (ΔTad), which are calculated upon a change in the intensity of the applied magnetic field. In anisotropic magnetic systems it is observed a change in the magnetocaloric effect, since this potential becomes strongly dependent on the direction in which the external magnetic field is applied. The anisotropy in such magnetic systems can lead to an inverse magnetocaloric effect, as well as to the definition of an anisotropic magnetocaloric effect, that by definition is calculated upon a magnetic field which intensity is kept fixed and which orientation is changed from a hard direction of magnetization to the easy direction of magnetization. This anisotropic magnetocaloric effect was performed for the RAl2 intermetallic compounds considering a microscopic model Hamiltonian that includes the Zeeman interaction, the exchange interaction (taken in the mean field approximation) and the crystalline electrical field, that is responsible for the anisotropy in the RAl2 compounds. The anisotropic magnetocaloric was fully investigated for the serie RAl2 and compared with the usual magnetocaloric effect and several curves of (ΔSiso) and (ΔTad) were obtained.

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Actes de conférences sur le sujet "NPs anisotropiche"

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Hadhazi, Daniel, and Gabor Horvath. "Proximal Gradient based Anisotropic TV-L0 Reconstruction for Linear Tomosynthesis." In 2021 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2021. http://dx.doi.org/10.1109/nss/mic44867.2021.9875726.

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Rajput, H. "Exploiting Reducing Ability of DMF For Assembled Gold Nanostructures." In Functional Materials and Applied Physics. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901878-14.

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Abstract. We explore stable assembly of gold NPs in single step process by introducing a simple chemical synthesis in which pH changed gold precursor is added to dimethylformamide solution at RT. The redox chemistry of N, N-dimethylformamide (DMF) has been effectively utilized in the formation of surfactant free, small chain metal NPs networks (plasmonic oligomers) via molecular dipolar coupling. Kinetic absorption / TEM images illustrate gold nanocrystals formation, their inter-particle coupling as a function of pH as well as with DMF-Water ratio. Sub-nano gap inter-particle coupling b/w spherical/anisotropic Au NPs is seen through arising of new LSPR hump in NIR region. 1-D organized gold nanocrystals are formed when pH modified metal precursor is added to refluxed (80 0C) DMF: Water mixture. The inter-particle coupling provides unique strategy can promote complex sub-wavelength optical waveguides and nanophotonic devices.

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Xin Jin, Liang Li, Zhiqiang Chen, Li Zhang, and Yuxiang Xing. "Anisotropic total variation for limited-angle CT reconstruction." In 2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC). IEEE, 2010. http://dx.doi.org/10.1109/nssmic.2010.5874180.

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Tsubokura, Y., M. Miyamoto, K. Ikeda, T. Nakamura, and T. Takahashi. "Anisotropic superconductivity in /spl kappa/-(BET-TTF)/sub 2/Cu(NCS)sub 2/." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.834889.

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Borsdorf, Anja, Steffen Kappler, Rainer Raupach, and Joachim Hornegger. "Analytic noise propagation for anisotropic denoising of CT images." In 2008 IEEE Nuclear Science Symposium and Medical Imaging conference (2008 NSS/MIC). IEEE, 2008. http://dx.doi.org/10.1109/nssmic.2008.4774438.

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"3D anisotropic total variation method for limitedangle CT reconstruction." In 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC). IEEE, 2013. http://dx.doi.org/10.1109/nssmic.2013.6829228.

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Tang, Shaojie, Yi Yang, Yan Gong, Kuidong Huang, Tianye Niu, and Xiangyang Tang. "Image-domain noise reduction with multiscale decomposition and anisotropic diffusion." In 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2015. http://dx.doi.org/10.1109/nssmic.2015.7582062.

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Debatin, Maurice, Piotr Zygmanski, Dzmitry Stsepankou, and Jurgen Hesser. "CT reconstruction from few-views by Anisotropic Total Variation minimization." In 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC). IEEE, 2012. http://dx.doi.org/10.1109/nssmic.2012.6551521.

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Brubaker, E., and J. Steele. "Neutron imaging using the anisotropic response of crystalline organic scintillators." In 2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC). IEEE, 2010. http://dx.doi.org/10.1109/nssmic.2010.5874055.

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Shi, Daxin, Alexander A. Zamyatin, and Zhi Yang. "Application of anisotropic diffusion potential to sparse view reconstruction problem." In 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference (2011 NSS/MIC). IEEE, 2011. http://dx.doi.org/10.1109/nssmic.2011.6153767.

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