Literatura académica sobre el tema "Self-organization of nanoparticles"

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Artículos de revistas sobre el tema "Self-organization of nanoparticles"

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Pyrpassopoulos, S., D. Niarchos, G. Nounesis, N. Boukos, I. Zafiropoulou y V. Tzitzios. "Synthesis and self-organization of Au nanoparticles". Nanotechnology 18, n.º 48 (1 de noviembre de 2007): 485604. http://dx.doi.org/10.1088/0957-4484/18/48/485604.

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Bianchi, Emanuela, Barbara Capone, Gerhard Kahl y Christos N. Likos. "Soft-patchy nanoparticles: modeling and self-organization". Faraday Discussions 181 (2015): 123–38. http://dx.doi.org/10.1039/c4fd00271g.

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We consider a novel class of patchy particles inspired by polymer-based complex units where the limited valence in bonding is accompanied by soft interactions and incessant fluctuations of the patch positions, possibly leading to reversible modifications of the patch number and size. We introduce a simple model that takes into account the aforementioned features and we focus on the role played by the patch flexibility on the self-organization of our patchy units in the bulk, with particular attention to the connectivity properties and the morphology of the aggregated networks.
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Bulavin, L. A., I. I. Adamenko, V. M. Yashchuk, T. Yu Ogul'chansky, Yu I. Prylutskyy, S. S. Durov y P. Scharff. "Self-organization C60 nanoparticles in toluene solution". Journal of Molecular Liquids 93, n.º 1-3 (septiembre de 2001): 187–91. http://dx.doi.org/10.1016/s0167-7322(01)00228-8.

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YABU, Hiroshi, Atsunori TAJIMA, Takeshi HIGUCHI y Masatsugu SHIMOMURA. "Preparation of Polymer Nanoparticles by Self-organization". Hyomen Kagaku 28, n.º 5 (2007): 277–82. http://dx.doi.org/10.1380/jsssj.28.277.

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Burunkova, J. A., I. Yu Denisyuk y S. A. Semina. "Self-Organization of ZnO Nanoparticles on UV-Curable Acrylate Nanocomposites". Journal of Nanotechnology 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/951036.

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Our work focused on synthesis and investigation of nanoparticles role in structuring of homogenous nanocomposite based on ZnO nanoparticles in UV-curable monomers mixture. Due to strong interaction between nanoparticles surface and polymerizable carboxylic acid, nanoparticles were distributed homogeneously, and density of nanocomposite increased also in comparison with pure polymer matrix. Light scattering, plasticity, and water sorption non-monotonically depends on the concentration of nanoparticles concentration. UV-curable active matrix polymerization on the surface of ZnO nanoparticles was investigated using IR spectroscopy. The set of structural modifications of polymeric nanocomposites were observed by ASM, light scattering, Brinell hardness, and water sorption.Suggestions that the nanoparticles in the polymerization process play the role of photocatalysts and provide structuring effect on the nanocomposite were discussed.
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Kyaw, Htet H., Salim H. Al-Harthi, Azzouz Sellai y Joydeep Dutta. "Self-organization of gold nanoparticles on silanated surfaces". Beilstein Journal of Nanotechnology 6 (10 de diciembre de 2015): 2345–53. http://dx.doi.org/10.3762/bjnano.6.242.

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The self-organization of monolayer gold nanoparticles (AuNPs) on 3-aminopropyltriethoxysilane (APTES)-functionalized glass substrate is reported. The orientation of APTES molecules on glass substrates plays an important role in the interaction between AuNPs and APTES molecules on the glass substrates. Different orientations of APTES affect the self-organization of AuNps on APTES-functionalized glass substrates. The as grown monolayers and films annealed in ultrahigh vacuum and air (600 °C) were studied by water contact angle measurements, atomic force microscopy, X-ray photoelectron spectroscopy, UV–visible spectroscopy and ultraviolet photoelectron spectroscopy. Results of this study are fundamentally important and also can be applied for designing and modelling of surface plasmon resonance based sensor applications.
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FUJITA, Masahiro. "Self-organization Simulation of Colloidal Nanoparticles using SNAP". Journal of the Japan Society of Colour Material 80, n.º 7 (2007): 295–300. http://dx.doi.org/10.4011/shikizai1937.80.295.

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Kushnir, Sergey E., Pavel E. Kazin, Lev A. Trusov y Yuri D. Tretyakov. "Self-organization of micro- and nanoparticles in ferrofluids". Russian Chemical Reviews 81, n.º 6 (30 de junio de 2012): 560–70. http://dx.doi.org/10.1070/rc2012v081n06abeh004250.

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Martin, C., D. Zitoun, L. Ressier, F. Carcenac, O. Margeat, C. Amiens, B. Chaudret, M. Respaud, J. P. Peyrade y C. Vieu. "Self-organization of CoRh nanoparticles on chemical nanopatterns". Journal of Magnetism and Magnetic Materials 272-276 (mayo de 2004): E1363—E1365. http://dx.doi.org/10.1016/j.jmmm.2003.12.216.

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Bitar, Rajaa, Gonzague Agez y Michel Mitov. "Cholesteric liquid crystal self-organization of gold nanoparticles". Soft Matter 7, n.º 18 (2011): 8198. http://dx.doi.org/10.1039/c1sm05628j.

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Tesis sobre el tema "Self-organization of nanoparticles"

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Nuermaimaiti, Ajiguli. "Studies on the Self-organization of Colloidal Nanoparticles at Interfaces". Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-130780.

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Various methods of growing highly ordered hexagonal arrays of polystyrene latexspheres on different substrates have been investigated. Series of experiments were performed on each growing method, namely spin-coating, parallel transferring with water evaporation, Langmuir-Blogett deposition and dip coating to study the optimal experimental conditions to let the particles form 2D crystals as well as the effects of different experimental parameters on the self-organization of the particles. Samples were characterized by means of contact angle measurements, optical microscopy, atomic forcemicroscopy and scanning electron microscopy. Relatively large areas of highly ordered particle arrays were obtained by means of dip-coating the hydrophilic glass substrate into the dilute colloidal suspension with the help of anionic surfactant SDS. And for the L-Bmethod, the hydrophobic substrate was found to be more favorable than the hydrophilicsubstrate. This thesis presents all the important experiments, results and discussions with an introduction to the basics of the topic at the beginning.
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Johnson, Christopher James. "Morphological control and self-organization of inorganic nanoparticles and nanostructures". Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411088.

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Zhang, Ren. "Directed Self-Organization of Polymer-Grafted Nanoparticles in Polymer Thin Films". University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1474652610501406.

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Liu, Zeming. "Self-organization of metallic nanoparticles in waveguides by laser : mechanisms modelling and new approaches". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES073/document.

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La présente thèse porte sur l’étude de l’auto-organisation induite par laser de nanoparticules (NPs) d’argent dans des couches minces de TiO2. Cette technique laser a été récemment mise au point pour fournir des solutions d'impression originales pour des applications comme l'imagerie polarimétrique, la sécurité ou le design. Ici, nous étudions expérimentalement et théoriquement les différents mécanismes impliqués dans la formation des NPs pour un meilleur contrôle de leur morphologie et de leur organisation. Dans le cas de lasers continus, nos résultats expérimentaux prouvent que la vitesse à laquelle le faisceau laser balaye la surface de l’échantillon est un paramètre crucial pour le contrôle de la taille finale des NPs, et de l’élévation de température induite dans la couche par le laser. La taille des NPs d’argent diminue aux basses vitesses d’écriture, alors que leur croissance est activée par effet thermique et apparait uniquement au-dessus d’un seuil de vitesse. La taille finale des NPs varie dans ce cas de façon non-monotone avec la vitesse de balayage alors que la hausse de température ne cesse de croître. Afin d'expliquer ces phénomènes contre-intuitifs, plusieurs modèles numériques ont été développés qui permettent de simuler la variation de la taille des NPs sous insolation laser dans le domaine spectral du visible. Les résultats théoriques concordent bien avec les observations expérimentales et révèlent que l’origine de ces phénomènes résulte d'interactions complexes entre les différents processus physico-chimiques impliqués dans la formation des NPs. Finalement, cette thèse démontre que l’auto-organisation des NPs à l’échelle sub-longueur d’onde peut être aussi réalisée avec des impulsions laser femto-secondes (fs), et une croissance anisotrope des NPs a été également observée pour une gamme particulière de paramètres laser. La comparaison avec les structures de NPs produites par lasers continus suggère que les impulsions laser fs offrent une meilleure maîtrise des effets thermiques et de la taille des NPs. L'usage de laser fs offre ainsi une nouvelle approche pour transférer ces technologies sur des supports souples comme les papiers ou les plastiques
This doctoral thesis focuses on the study of laser-induced self-organization of Ag nanoparticles (NPs) in TiO2 thin layers. This laser technique was recently developed to provide original printing solutions for applications like active color displays, security, or polarization imaging. Here, we investigate experimentally and theoretically the different mechanisms involved in the NPs formation for a better control of their morphology and organization. In the case of continuous-wave (cw) laser, our experimental results prove that the speed at which the laser scans the sample surface is a crucial parameter to control the NP size and the laser-induced temperature rise. Ag NPs shrink at low scan speed, whereas growth governed by a thermal effect only occurs above a speed threshold. Above this threshold, the size of grown Ag NPs changes in a non-monotonous way with scan speed, whereas laser-induced temperature rise increases with speed. In order to explain these counter-intuitive behaviors, several numerical models have been developed to simulate changes in the size distribution of Ag NPs induced by visible light. Simulation results are in good agreement with experimental observations and reveal the origin of the observed phenomena by collective interactions of various physico-chemical processes involved in the variation of NPs size. Finally, this thesis demonstrates that self-organization of NPs at sub-wavelength scale on large areas can also be performed with femtosecond (fs) laser pulses. Oriented anisotropic growth of NPs has also been observed using a proper selection of laser irradiation parameters. Compared with the cw laser induced structures, fs pulses offer better control of the thermal effect and NP size, which opens the way to transfer these technologies on plastic or paper substrates
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Anop, Hanna. "Directing through low ionic strength, free polymers and metallic nanoparticles the self-organization of viral rod-shaped colloids". Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0119.

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Les bactériophages en forme de filament, en raison de leurs propriétés physiques uniques, telles que leur monodispersité en taille et leur haute stabilité colloïdale, sont largement utilisés en matière molle en tant que système modèle de bâtonnets colloïdaux. En dispersions aqueuses, l'auto-organisation de ces virus s’est révélée être essentiellement conduite par l’entropie, ce qui implique des interactions purement répulsives entre les particules virales. Dans cette thèse, en modifiant la nature des interactions entre les bâtonnets viraux, nous avons étudié leur auto-organisation en phase cristal-liquides. Dans ce but, nous avons d'abord étudié un système de bâtonnets purement répulsifs à très basse force ionique, et longue répulsion électrostatique. Le comportement de phase de ces suspensions a été déterminé par l’utilisation de la diffusion des rayons X aux petits angles et de la microscopie optique. Nous avons montré que la phase Smectique-A n’est pas stable dans les cas de forte répulsion électrostatique entre particules virales et que le système présente une transition directe de la phase de Cholestérique à la phase Smectique-B en augmentant la fraction volumique. De plus, nos résultats mettent en évidence que les virus dans ces conditions ne forment pas de verres colloïdaux à forte concentration, ce qui contredit de récents travaux réalisés sur le même système.Dans une deuxième partie, nous avons modifié les interactions entre particules virales passant de purement répulsives à attractives en ajoutant des polymères libres aux suspensions, ce qui conduit à un effet de déplétion. En utilisant des polymères dont la taille est similaire au diamètre des bâtonnets, l'auto-organisation des virus, initiée dans la phase cristal-liquide cholestérique, conduit à une croissance de superstructures hélicoïdales. Dans ces structures, les bâtonnets sont principalement orientés le long de l'axe principal et présentent un ordre positionnel à longue portée, démontré par la diffusion des rayons X aux petits angles et le suivi de particules individuelles en microscopie optique. Les diagrammes de phase dse mélanges virus/polymères ainsi que la stabilité dans le temps des superstructures hélicoïdales ont été déterminés et comparés pour deux tailles différentes de polymères.Dans la dernière partie, nous avons favorisé les interactions attractives de Van der Waals dans notre système en introduisant des nanoparticules d'or dans des colloïdes hybrides auto-assemblés à base de virus. Ainsi, différents colloïdes hybrides consistant en un (en forme de sceptre) ou deux (dibloc) virus attachés à la même nanoparticule d'or ont été produits. Cette approche utilisant les nanoparticules d'or a été étendue afin de lier ensemble deux virus de différentes longueurs pour obtenir des diblocs colloïdaux asymétriques. L'auto-organisation des particules en forme de sceptre et des diblocs symétriques induite par déplétion a été explorée et les diagrammes de phases correspondants ont été établis. Nous avons ainsi montré que les interactions de Van der Waals entre nanoparticules d'or favorise la formation de fibrilles de type Smectique-B dans lesquelles les particules de virus sont organisées en une succession de couches séparées par des couches de nanoparticules d’or. Finalement, nous avons étudié l'effet de l'introduction d'une faible asymétrie dans de ces colloïdes hybrides et l’effet sur la ségrégation potentielle de leurs blocs respectifs au travers de la formation de phase lamellaire de type Smectique-A.Dans cette thèse, nous avons ainsi démontré une manière efficace de contrôler l'auto-organisation de colloïdes en forme de filament en modifiant leurs interactions, ce qui conduit à la formation de diverses morphologies auto-assemblées originales
Filamentous bacteriophages, due to their unique physical properties, such as size monodispersity and high colloidal stability, are widely used in soft condensed matter as a system of rod-shaped colloids. In aqueous dispersions, self-organization of these viruses has been shown to be essentially driven by entropy, which means purely repulsive (hard core) interactions between viral particles. In this thesis, by varying the nature of the interactions between viral rods, we have studied their resulting self-organization into liquid crystalline phases. For this purpose, we have first investigated the system of purely repulsive rods at very low ionic strength, where thick electric double layers are present. The phase behavior of virus suspensions at very low ionic strength has been determined using small angle X-ray scattering (SAXS) and optical microscopy techniques. We have found that the Smectic-A phase is not stable in case of high electrostatic repulsion between viral particles and that the system undergoes a direct Cholesteric to Smectic-B phase transition by increasing rod concentration. Moreover, our results evidence that viruses with thick double layers do not form colloidal glasses at high concentrations, which contradicts recently reported findings for the same system.In a second part, we have tuned viral particle interactions from purely repulsive to attractive ones by adding non-adsorbing polymers in their suspensions, which act as depletant agent. By using polymers with coil size comparable to the rod diameter, virus self-organization initiated from the Cholesteric liquid crystalline phase results in a growth of original chiral superstructures, called helical bundles. Viruses are mostly oriented along the main bundle axis and exhibit long-range positional order, as proved by SAXS and by single particle tracking using optical microscopy. Phase diagrams of virus/polymer two-component mixtures as well as the stability with time of the resultant helical superstructures have been determined and compared for two different polymer sizes.In the last part, we have increased Van der Waals attractive interactions in our viral system by introducing gold nanoparticles into self-assembled hybrid virus-based colloids. Thus, different hybrid virus-based colloids consisting of one (scepter-like) or two (diblocks) viral filaments attached to the same gold nanoparticle have been produced. This approach using gold nanobead has been extended to link together two bacteriophages of different lengths to achieve asymmetric colloidal diblocks. Self-organization of scepter-like particles and symmetrical diblocks driven by soft effective attraction has been explored and the corresponding phase diagrams have been established. We have found that Van der Waals attractive interactions between gold nanobeads incorporated into hybrid colloids favor formation of Smectic-B like fibrils in which virus particles are organized in periodic layers separated by layers of gold nanobeads. Finally, we have studied the effect of introducing a weak asymmetry into hybrid virus-based colloids and investigated the possible segregation of their respective blocks through the formation of the lamellar Smectic-A phase.Overall, we have demonstrated an efficient way to control self-organization of virus-based colloids by varying interactions between them, which results in formation of various original self-assembled morphologies
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Sharma, Nipun. "Self-organization of silver nanoparticles with femtosecond laser in TiO2 matrix : Applications to plasmonic colours, multiple hidden images and Colour Image-Multiplexing". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES032.

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L'auto-organisation de nanoparticules métalliques dans un support est un moyen efficace et peu coûteux de produire des systèmes plasmoniques pouvant être utilisés pour des applications d'affichage couleur actif, de codage d'image et de sécurité. De tels systèmes nanocomposites doivent être synthétisés sous forme de films stables qui pourraient être enduits sur tout type de surface pour un traitement laser. Cette thèse de doctorat porte sur l 'auto - organisation induite par laser de couches minces nanocomposites d' argent et d 'oxyde de titane mésoporeux.Dans ce travail, nous étudions d'abord la synthèse de couches minces mésoporeuses de TiO2 à l'aide d'un processus hydrolytique, facile à mettre en œuvre, pour fournir des films cristallisés à partir de 100 ° C. sont rapportés dans ce travail. En outre, les mécanismes de croissance des nanocristaux dans les films mésoporeux de TiO2 sont étudiés sous la forme de mesures ellipsométriques mettant en évidence son effet sur la porosité et la cristallinité du film avec la température de recuit.La deuxième étude démontre la fabrication de différentes structures nanocomposites à l'aide de la technique de balayage laser femtoseconde, déclenchant la croissance et l'auto-organisation de nanoparticules d'argent à l'intérieur d'une matrice de titane amorphe poreuse donnant lieu à des couleurs dichroïques plasmoniques. Une recherche plus approfondie sur l'étude paramétrique de ces nanocomposites donne lieu à différentes nanostructures à deux régimes de vitesse de balayage différents, qui se forment à la surface et sont noyées en dessous en raison de l'excitation de la surface et des modes guidés. La flexibilité de cette technologie de marquage laser permet également de fabriquer des nanostructures hybrides composées de différents types de nanostructures adjacentes, entrelacées pour couvrir de grandes surfaces. Une extension de cette étude est conclue sur des substrats plastiques / flexibles pour encoder des images imprimées diffractives. Ici, les nanostructures de surface (LIPSS) sont formées en utilisant le contrôle de la polarisation du laser et donc de l'orientation du réseau, qui est utilisé pour coder des images de niveau de gris qui peuvent être observées dans les modes de diffraction.De plus, cette étude se conclut en produisant trois multiplexages d'images qui peuvent être observés dans trois modes sélectionnés d'observation sous lumière blanche en réflexion avec lumière non polarisée et transmission entre polariseurs pour deux angles de polarisation différents. Cela est dû au fait que la biréfringence et le dichroïsme du film peuvent être contrôlés pour produire des gammes de couleurs sans précédent pour le multiplexage. Un tel traitement laser intelligent sur des films minces nanocomposites donne lieu à des applications artistiques et de sécurité en codant différentes images jusqu'à trois sous la même zone
Self-organization of metallic nanoparticles in a medium is an efficient and a low-cost way to produce plasmonic systems that can be used for applications to active colour display, image encoding, and security. Such nanocomposite systems must be synthesized in form of stable films which could be coated on any kind of surface for laser processing. This doctoral thesis focuses on laser‐induced self‐organization of nanocomposite thin films of silver and mesoporous titania.In this work, we first investigate synthesizing mesoporous TiO2 thin films using hydrolytic process, which is easy to implement, to provide crystallized films starting at 100°C. First activation energies in mesoporous TiO2 films using Raman spectroscopy in combination with the phonon quantum confinement model are reported in this work. Further, growth mechanisms of nanocrystals in mesoporous TiO2 films are investigated in form of ellipsometric measurements highlighting its effect on film porosity and crystallinity with annealing temperature.The second study demonstrates fabrication of different nanocomposite structures using femtosecond laser scanning technique, triggering growth and self-organization of silver nanoparticles inside porous amorphous titania matrix giving rise to plasmonic dichroic colours. Further investigation on the parametric study of such nanocomposites gives rise to different nanostructures at two different scan speed regimes, which are formed at the surface and are embedded below due to excitation of surface and the guided modes. The flexibility of this laser-based marking technology also allows to fabricate hybrid nanostructures composed of different adjacent nanostructure types, interlaced to cover large areas. An extension of this study is concluded on plastic/flexible substrates to encode diffractive printed images. Here surface nanostructures (LIPSS) are formed by using the control of laser polarization and thus grating orientation, which is used to encode grey-level images that can be observed in diffraction modes.Further, this study is concluded by producing three image multiplexing which can be observed in three selected modes of observation under white light in reflection with non-polarized light and transmission between polarizers for two different polarization angles. This is due to the fact that the film birefringence and dichroism can be controlled to produce unprecedented colour gamuts for multiplexing. Such smart laser processing on nanocomposite thin films gives rise to artistic and security applications by encoding different images up to three under same area
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Cao, Xue-Zheng, Holger Merlitz, Chen-Xu Wu, Goran Ungar y Jens-Uwe Sommer. "A theoretical study of dispersion-to-aggregation of nanoparticles in adsorbing polymers using molecular dynamics simulations". Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A36333.

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The properties of polymer–nanoparticle (NP) mixtures significantly depend on the dispersion of the NPs. Using molecular dynamics simulations, we demonstrate that, in the presence of polymer–NP attraction, the dispersion of NPs in semidilute and concentrated polymers can be stabilized by increasing the polymer concentration. A lower polymer concentration facilitates the aggregation of NPs bridged by polymer chains, as well as a further increase of the polymer–NP attraction. Evaluating the binding of NPs through shared polymer segments in an adsorption blob, we derive a linear relationship between the polymer concentration and the polymer–NP attraction at the phase boundary between dispersed and aggregated NPs. Our theoretical findings are directly relevant for understanding and controlling many self-assembly processes that use either dispersion or aggregation of NPs to yield the desired materials.
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Бадалян, Анна Юріївна, Анна Юрьевна Бадалян y Anna Yuriivna Badalian. "Формування та режими руху ансамблів наночастинок в рамках статистичної теорії". Thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/68324.

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Дисертаційна робота присвячена розробці оптимальних теоретичних моделей, що дозволяють описувати поведінку наночастинок на мікроскопічному рівні з урахуванням неадитивності властивостей та колективну поведінки ансамблів наночастинок у процесі самоорганізації. Так як концепція самоорганізації є узагальненням фізичного поняття фазового переходу, то викладене в роботі феноменологічний підхід слід вважати розвитком схем термодинамічних перетворень на відкриті складні системи. Для підтвердження спільності синергетичної теорії досліджується кілька підходів при описі поведінки ансамблів наночастинок. У літературному огляді були позначені цілі та завдання дисертаційної роботи, обґрунтовано актуальність дослідження. Для кожного з досліджених процесів самоорганізації було визначено мінімальний набір степенів свободи. Представлені кілька систем диференціальних рівнянь, що дозволяють самостійно описати процес самоорганізації ансамблів наночастинок. Знайдені стаціонарні значення основних параметрів, що визначаються розв’язками систем диференційних рівнянь. Також досліджена динаміка процесу самоорганізації наночастинок; вивчена стохастична картина самоорганізації за допомогою флуктуацій основних параметрів системи; побудована статистична картина переходу між різними режимами руху наночастинок; в рамках мікроскопічного підходу досліджені властивості основних параметрів наносистем; проаналізована феноменологічна модель переходу між парамагнітним та магнітовпорядкованим станами нанокластерної системи за механізмом фазового переходу першого роду з урахуванням міжкластерної взаємодії та дії зовнішнього тиску; знайдена температурна залежність стаціонарного значення відносної намагніченості та критичне значення тиску, за якого можливий перехід.
Диссертационная работа посвящена разработке оптимальных теоретических моделей, позволяющих описывать поведение наночастиц на микроскопическом уровне с учетом свойств неаддитивности и коллективное поведение ансамблей наночастиц в процессе самоорганизации. Так как концепция самоорганизации является обобщением физического понятия фазового перехода, то изложенный в работе феноменологический подход следует считать развитием схемы термодинамических преобразований на открытые сложные системы. Для подтверждения общности синергетической теории исследуется несколько подходов при описании поведения ансамблей наночастиц. В литературном обзоре были обозначены цели и задачи диссертационной работы, обоснована актуальность исследования. Для каждого из исследованных процессов самоорганизации был определен минимальный набор степеней свободы. Представлены несколько систем дифференциальных уравнений, позволяющие самостоятельно описать процесс самоорганизации ансамблей наночастиц. Найденные стационарные значения основных параметров, определяемые решениями систем дифференциальных уравнений. Также исследована динамика процесса самоорганизации наночастиц; изучена стохастическая картина самоорганизации с помощью флуктуаций основных параметров системы; построена статистическая картина перехода между различными режимами движения наночастиц; в рамках микроскопического подхода исследованы свойства основных параметров наносистем; проанализирована феноменологическая модель перехода между парамагнитным и магнитоупорядоченным состояниями нанокластерной системы по механизму фазового перехода первого рода с учетом межкластерного взаимодействия и действия внешнего давления; найдена температурная зависимость стационарного значения относительной намагниченности и критическое значение давления, при котором возможен переход.
The thesis is devoted to the development of optimal theoretical models that allow describing the behavior of nanoparticles at a microscopic level, taking into account the properties of nonadditivity and the collective behavior of ensembles of nanoparticles in the process of self-organization. Since the concept of self-organization is a generalization of the physical concept of a phase transition, the phenomenological approach presented in this paper should be considered as an evolution of the scheme of thermodynamic transformations to open complex systems. To confirm the generality of the synergetic theory, several approaches are considered in describing the behavior of ensembles of nanoparticles. In the literary review, the goals and objectives of the dissertation work were identified, the relevance of the study was substantiated. For each of the self-organization processes studied, a minimum set of degrees of freedom was defined. Several systems of differential equations are presented that allow one to describe independently the process of self-organization of ensembles of nanoparticles. The stationary values of the basic parameters, determined by solutions of systems of differential equations, are found. The dynamics of the self-organization of nanoparticles was also studied; the stochastic picture of self-organization by means of fluctuations of the basic parameters of the system is studied; a statistical picture of the transition between different regimes of motion of nanoparticles is constructed; in the framework of a microscopic approach, the properties of the main parameters of nanosystems were investigated; the phenomenological model of the transition between the paramagnetic and magnetically ordered states of a nanocluster system is analyzed by the mechanism of the first-order phase transition, taking into account the intercluster interaction and the action of external pressure; the temperature dependence of the stationary value of the relative magnetization and the critical value of the pressure at which the transition is possible are found.
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Gharbi, Ines. "Films cristal liquide polymérisés et auto-organisation de nanoparticules d’or". Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS286.

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Dans cette thèse nous étudions des systèmes composites cristaux liquides / polymères / nanoparticules. Nous utilisons les déformations des cristaux liquides pour contrôler l’auto-organisation induite des nanoparticules et également la polymérisation des matrices cristal liquide pour assurer la stabilité des systèmes nanocomposites et diversifier les techniques de caractérisation d’imagerie et d’optique. Nous nous sommes tout d’abord intéressés aux films cristal liquide nématique puis cholestérique, sans et avec polymère, en l’absence et en présence de nanoparticules, ces dernières étant choisies sphériques de taille unique. Par la suite, nous nous sommes intéressés à la polymérisation des stries huileuses présentes dans la phase smectique A. La comparaison entre les différents comportements des nanoparticules lorsqu’elles sont isolées en solution ou rassemblées et auto-organisées sur un substrat PVA sans cristal liquide (CL) ou sur un substrat avec CL nématiques ou cholestériques, nous a permis de comprendre comment les nanoparticules et la matrice interagissent pour aboutir à la structure finale du système composite, caractérisée par de nouvelles propriétés optiques des nanoparticules. Nous avons établi comment une matrice nématique permettait de conserver un ordre hexagonal quasi-parfait pour des nanoparticules d’or déposées en surface, tout en les rapprochant les unes des autres (compression induite de la monocouche formée) pour diminuer désordre et déformation induits dans la matrice, ce qui décale significativement la résonance de plasmon des nanoparticules. Nous avons également mis en évidence que les nanoparticules induisent un changement d’orientation des molécules nématiques vers une orientation tiltée, accompagnée d’un phénomène de démouillage de la matrice au niveau des nanoparticules. Le passage d’une matrice nématique à une matrice cholestérique conserve l’ordre hexagonal de la monocouche comprimée pour les nanoparticules mais avec un plus grand désordre induit localement par la grande distorsion élastique en surface et au fond des ondulations de la matrice cholestérique mise en évidence par une simulation du cholestérique frustré entre les deux ancrages, planaire sur PVA et homéotrope avec l’air. La structure en modulation du cholestérique joue un rôle de moule de telle sorte que les nanoparticules reproduisent à l’échelle mésoscopique la texture cholestérique à l’interface en formant des rubans qui imitent parfaitement les modulations cholestériques. On retrouve le phénomène de démouillage, mais moins profond que pour le nématique, en lien avec la localisation des nanoparticules dans les zones tiltées au-dessus de la région de plus forte déformation en splay du cholestérique. Au sein de la même matrice cholestérique, l’augmentation de la concentration en nanoparticules entraine une modification profonde des propriétés optiques des nanoparticules. Nous montrons que c’est lié à la mise en place de structures nouvelles pour les nanoparticules, toujours induites par la structure modulée du cholestérique, qui, elle, n’est que peu modifiée. On passe, quand la concentration augmente, d’une monocouche en labyrinthes à deux dimensions fortement désordonnée et comprimée jusqu’à des organisations de tailles et formes contrôlées à trois dimensions (des agrégats). Les propriétés optiques sont modifiées en lien avec un fort renforcement de l’interaction électromagnétique entre nanoparticules. Ces dernières couvrent la totalité des modulations qui ne jouent plus le rôle de moule mais se retrouvent seulement tronquées en surface par la présence des nanoparticules. Ceci met en évidence la robustesse de cette structure cholestérique, mais également les rôles moteurs combinés des déformations élastiques du cholestérique et de l’ancrage induit par les nanoparticules sur les structures obtenues et en retour sur les modifications de propriétés optiques induites. Par ailleurs, concernant la polymérisation des stries [...]
We study composite systems liquid crystals / polymers / nanoparticles. We use liquid crystal distortions to control the induced nanoparticle organization and also the polymerization of liquid crystal matrices that ensures the stability of the composites and allows to diversify the imaging and optical characterization techniques. First of all, we are interested in nematic and cholesteric liquid crystal films, with and without polymer, in the absence and in the presence of nanoparticles, the latter being chosen as spherical gold nanoparticles of diameter 6nm. Subsequently, we were interested in the polymerization of the so-called smectic oily streaks. The comparison between the different behaviors of the nanoparticles when isolated in solution or gathered and self-organized on a PVA substrate without liquid crystal (LC) or on a substrate with nematic or cholesteric LC, allowed us to understand how the nanoparticles and the matrix interact to reach the final structure of the composite system, characterized by new optical properties of the nanoparticles. We have established how a nematic matrix allows to preserve an almost perfect hexagonal order for gold nanoparticles deposited on the surface, while bringing them closer to each other (induced compression of the monolayer formed) to decrease disorder and distortion induced in the matrix, which significantly shifts the plasmon resonance of the gold nanoparticles. We have also demonstrated that the nanoparticles induce a change of orientation of the nematic molecules towards a tilted orientation, accompanied by a dewetting phenomenon of the matrix on top of the nanoparticles. The transition from a nematic matrix to a cholesteric matrix preserves the hexagonal order of the compressed monolayer for the nanoparticles but with an enhanced disorder, locally induced by the larger elastic distortion close to the air/interface and more specifically at the bottom of the undulations of the cholesteric matrix, which was evidenced by a simulation of a frustrated cholesteric between the two anchoring, planar on PVA and homeotrope with air. The cholesteric modulation structure acts as a mold so that the nanoparticles reproduce on the mesoscopic scale the cholesteric texture at the interface by forming ribbons that perfectly mimic the cholesteric modulations. We again evidence a phenomenon of dewetting, but smaller than for the nematic, in relation with the localization of the nanoparticles in the cholesteric tilted areas above the region of strong cholesteric splay distortion. Within the same cholesteric matrix, the increase of the concentration of nanoparticles causes a profound change in the optical properties of the nanoparticles. We show that it is related to the establishment of new structures for the nanoparticles, always induced by the modulated structure of cholesteric, which, in return is only slightly modified. As the concentration increases, one passes from a monolayer of highly disordered and compressed two-dimensional labyrinths up to 3D structures (aggregates) of controlled size and shape. The optical properties are modified in relation with a strong strengthening of the electromagnetic interaction between nanoparticles. The nanoparticles occupy the overall surface of the cholesteric modulations, which no longer play the role of mold, but are found to be truncated at the surface by the presence of nanoparticles. The fact that the modulated cholesterics is only poorly modified highlights the robustness of this cholesteric structure, but also the combined influence of the cholesteric elastic distortions and of the nanoparticle-induced anchoring on the nanoparticle organization and in return on the induced optical properties. Moreover, concerning the polymerization of smectic oily streaks, we have succeeded to preserve the smectic A texture in the nematic phase, in relation with the creation of a particularly robust polymer skeleton that mimics the initial smectic texture
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Achkar, Charbel. "Etudes de nanostructures magnétiques auto-organisées et épitaxiées par synthèse organométallique en solution sur des surfaces cristallines". Thesis, Toulouse, INSA, 2014. http://www.theses.fr/2014ISAT0037/document.

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Les travaux élaborés dans cette thèse ont pour objectif de caractériser les propriétés magnétiques et structurales de nanostructures magnétiques obtenues par une nouvelle méthode de synthèse mixte physique/chimique, dite croissance hybride. La première partie du travail réalisé consiste en l’élaboration de films minces métalliques sur substrats par pulvérisation cathodique. Sur ces films minces, la synthèse chimique par voie organométallique aboutit à des réseaux de nanofils de Co monocristallins hcp, ultra-denses, ou des films nanostructurés de Fe. Les observations MEB/MET et les mesures de diffraction de rayons X réalisées sur les substrats montrent le fort impact induit par la cristallinité de la couche mince sur la morphologie et la direction de croissance des nanostructures magnétiques.Les mesures magnétiques réalisées sur des réseaux de nanofils de Co montrent une forte anisotropie magnétique perpendiculaire au substrat. Cela est obtenu grâce à l’anisotropie magnétocristalline du Co hcp (avec l’axe c parallèle à l’axe du fil) qui s’ajoute à l’anisotropie de forme. L’aimantation thermiquement stable, semble suivre un régime de retournement cohérent, régime non observé dans les structures polycristallines. L’organisation de ces nanostructures, leur grande densité et la stabilité de leur aimantation font de ce réseau un bon candidat aux applications de médias d’enregistrement magnétique à forte densité
The elaboration of this thesis aims to characterize the magnetic and structural properties of magnetic nanostructures obtained by a new mixed physical / chemical synthesis method, called hybrid growth. The first part of the work consists in the development of thin metal films on substrates by cathode sputtering. Furthermore, the chemical synthesis conducted by organometallic chemistry on those thin films, results in an array of ultra-dense Co monocristallins hcp nanowires, or nanostructured Fe films. Additionally, The SEM/TEM observations and the X-ray diffraction measurements conducted on the substrates and induced by the crystlalline structure of the thin film, show the high impact on the magnetic nanostructures morphology and growth direction.Moreover, the magnetic measurements executed on the Co nanowires array show a strong magnetic anisotropy perpendicular to the substrate. This observation is obtained due to the magnetocrystalline anisotropy acting along the nanowire axis (Co hcp structure with the c axis parallel to the nanowire axis) in the same direction of the nanowires shape anisotropy. The magnetization within these structures is thermally stable. It follows a coherent magnetization reversal mode that has not been observed in the polycrystalline structures up to now. Finally, the self-organization of the nanowires as well as their high density and stable magnetization nominate this system for their application in high density magnetic storage devices
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Libros sobre el tema "Self-organization of nanoparticles"

1

Dvorsky, Richard, Ladislav Svoboda y Jiří Bednář. Nanoparticles’ Preparation, Properties, Interactions and Self-Organization. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-89144-2.

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Blunt, MO, A. Stannard, E. Pauliac-Vaujour, CP Martin, Ioan Vancea, Milovan Suvakov, Uwe Thiele, Bosiljka Tadic y P. Moriarty. Patterns and pathways in nanoparticle self-organization. Editado por A. V. Narlikar y Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.8.

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This article reviews relatively recent forms of self-assembly and self-organization that have demonstrated particular potential for the assembly of nanostructured matter, namely biorecognition and solvent-mediated dynamics. It first considers the key features of self-assembled and self-organized nanoparticle arrays, focusing on the self-assembly of nanoparticle superlattices, the use of biorecognition for nanoparticle assembly, and self-organizing nanoparticles. It then describes the mechanisms and pathways for charge transport in nanoparticle assemblies, with particular emphasis on the relationship between the current–voltage characteristics and the topology of the lattice. It also discusses single-electron conduction in nanoparticle films as well as pattern formation and self-organization in dewetting nanofluids.
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Svoboda, Ladislav, Richard Dvorsky y Jiří Bednář. Nanoparticles' Preparation, Properties, Interactions and Self-Organization. Springer International Publishing AG, 2021.

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Narlikar, A. V. y Y. Y. Fu, eds. Oxford Handbook of Nanoscience and Technology. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.001.0001.

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This Handbook consolidates some of the major scientific and technological achievements in different aspects of the field of nanoscience and technology. It consists of theoretical papers, many of which are linked with current and future nanodevices, molecular-based materials and junctions (including Josephson nanocontacts). Self-organization of nanoparticles, atomic chains, and nanostructures at surfaces are further described in detail. Topics include: a unified view of nanoelectronic devices; electronic and transport properties of doped silicon nanowires; quasi-ballistic electron transport in atomic wires; thermal transport of small systems; patterns and pathways in nanoparticle self-organization; nanotribology; and the electronic structure of epitaxial graphene. The volume also explores quantum-theoretical approaches to proteins and nucleic acids; magnetoresistive phenomena in nanoscale magnetic contacts; novel superconducting states in nanoscale superconductors; left-handed metamaterials; correlated electron transport in molecular junctions; spin currents in semiconductor nanostructures; and disorder-induced electron localization in molecular-based materials.
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Capítulos de libros sobre el tema "Self-organization of nanoparticles"

1

Dvorsky, Richard, Ladislav Svoboda y Jiří Bednář. "Self-Organization of Nanoparticles". En Nanoparticles’ Preparation, Properties, Interactions and Self-Organization, 51–73. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89144-2_3.

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Dvorsky, Richard, Ladislav Svoboda y Jiří Bednář. "Interaction Among Nanoparticles". En Nanoparticles’ Preparation, Properties, Interactions and Self-Organization, 43–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89144-2_2.

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Dvorsky, Richard, Ladislav Svoboda y Jiří Bednář. "Nanoparticles—Their Specific Properties and Origin". En Nanoparticles’ Preparation, Properties, Interactions and Self-Organization, 1–41. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89144-2_1.

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Dvorsky, Richard, Ladislav Svoboda y Jiří Bednář. "Lamelar Aggregation of Nanoparticles From a Frozen Liquid at the Sublimation Interface—Mathematical Modeling". En Nanoparticles’ Preparation, Properties, Interactions and Self-Organization, 75–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89144-2_4.

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Dvorsky, Richard, Ladislav Svoboda y Jiří Bednář. "Lamelary Aggregation of Nanoparticles from Frozen Liquid on the Sublimation Interface—Experimental Preparation and Application of Nanomaterials". En Nanoparticles’ Preparation, Properties, Interactions and Self-Organization, 89–111. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89144-2_5.

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Govor, L. V. y J. Parisi. "Charge Transport in Chain of Nanoparticles". En Bottom-Up Self-Organization in Supramolecular Soft Matter, 83–99. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19410-3_4.

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Yamaguchi, Tomohiko, Nobuhiko Suematsu y Hitoshi Mahara. "Hierarchical Self-organization and Self-assembly: Metal Nanoparticles in Polymer Matrices". En Bottom-Up Self-Organization in Supramolecular Soft Matter, 1–10. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19410-3_1.

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Tonoyan, A. O., S. P. Davtyan y S. C. Müller. "Influence of Nanoparticles on the Mechanism and Properties of Nanocomposites Obtained in Frontal Regime". En Bottom-Up Self-Organization in Supramolecular Soft Matter, 101–26. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19410-3_5.

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Pileni, M. P. "Self-Organization of Spherical Nanoparticles in Two- and Three-Dimensinal Superlattices". En ACS Symposium Series, 29–40. Washington, DC: American Chemical Society, 1997. http://dx.doi.org/10.1021/bk-1997-0679.ch004.

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Dragieva, Iovka, Christina Deleva, Mladen Mladenov y Ivania Markova-Deneva. "Self-Organization of Magnetic Nanoparticles and Inclusion of Hydrogenby Borohydride Reduction". En Nanostructured Materials, 71–78. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-6740-3_6.

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Actas de conferencias sobre el tema "Self-organization of nanoparticles"

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Abdullah, Mikrajuddin, Sahrul Saehana, Bebeh W. Nuryadin, Euis Sustini, Khairurrijal, Fatimah A. Noor, Mikrajuddin Abdullah y Khairurrijal. "Introducing Organization Parameter for Self-Organized Nanoparticles". En THE THIRD NANOSCIENCE AND NANOTECHNOLOGY SYMPOSIUM 2010 (NNSB2010). AIP, 2010. http://dx.doi.org/10.1063/1.3515557.

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Maurer, T., A. Sarrazin, A. Plaud, J. Béal, R. Nicolas, S. S. Lamarre, J. Proust et al. "Strategies for self-organization of Au nanoparticles assisted by copolymer templates". En SPIE NanoScience + Engineering, editado por Mark I. Stockman. SPIE, 2013. http://dx.doi.org/10.1117/12.2025144.

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Promnimit, S., S. Pratontep, C. Thanachayanont, J. K. Park y J. Dutta. "Growth Process of Novel Thin Films by Directed Self Organization of Nanoparticles". En 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems. IEEE, 2007. http://dx.doi.org/10.1109/nems.2007.352016.

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LIN, J., W. L. ZHOU y C. J. O'CONNOR. "SYNTHESIS AND SELF-ORGANIZATION OF GOLD NANOPARTICLES INTO SUPERLATTICES FROM CTAB REVERSE MICELLES". En Proceedings of the International Symposium. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793805_0051.

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Starovoytov, Anton A., Rezida D. Nabiullina y Nikita A. Toropov. "Self-organization and photo-induced formation of cyanine dye aggregates on the plasmonic Ag nanoparticles". En SPIE Photonics Europe, editado por David L. Andrews, Jean-Michel Nunzi y Andreas Ostendorf. SPIE, 2016. http://dx.doi.org/10.1117/12.2229002.

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Belkacem, A. "Light Induced Self-organization of Metal Nanoparticles in TiO2 Probed with Intense Femtosecond Extreme Ultraviolet Pulses". En Compact EUV & X-ray Light Sources. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/euvxray.2016.em6a.2.

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TOSHIMA, NAOKI, YUKIHIDE SHIRAISHI, TORU MATSUSHITA, HISAYOSHI MUKAI y KAZUTAKA HIRAKAWA. "SELF-ORGANIZATION OF METAL NANOPARTICLES AND ITS APPLICATION TO SYNTHESES OF Pd/Ag/Rh TRIMETALLIC NANOPARTICLE CATALYSTS WITH TRIPLE CORE/SHELL STRUCTURES". En Proceedings of the Asian Symposium on Nanotechnology and Nanoscience 2002. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812796714_0004.

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Choi, Eunpyo, Kilsung Kwon, Hyung-kwan Chang, Daejoong Kim y Jungyul Park. "Control of Highly Organized Nanostructures in Microchannels Using Nanoliter Droplets". En ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-4105.

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In this study, we introduce a novel method for control of self-organization of nanoparticles in microchannels using the control of nanoliter droplets and show its useful applications. By controlling capillary force and evaporation process, nanoparticles can be assembled at the desired area and they can be used from nanoporous membranes to biosensor itself. As the biosensor applications, biologically inspired humidity sensor and IgG antibody detector were developed. They can recognize the target materials by the change of visual color without using any fluorescent probe and external electrical power source. These highly organized nanoparticles also induce the unique nanoelectrokinetics, which open new application fields such as such as separation, filtering, accumulation, and analysis of biomolecules, energy generation, and optofluidic system. Among them, we introduce two techniques that are diffuse based chemical gradient generation and sea water desalination.
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Fritzsche, Wolfgang. "Multi-Level Self Organization Process For A Parallel Fabrication Of Aligned Metal Structures In Microelectrode Gaps Using DNA And Metal Nanoparticles". En DNA-BASED MOLECULAR ELECTRONICS: International Symposium on DNA-Based Molecular Electronics. AIP, 2004. http://dx.doi.org/10.1063/1.1805373.

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Fujii, Y., T. Shimizu, M. Hosoda, G. Wu, S. Huang, H. Sakaue, T. Takahagi y S. Shingubara. "Large Negative Resistance Property Observed in 3-D Network of DNA and Gold Nanoparticle Formed by DNA Mediated Self-organization". En 2004 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2004. http://dx.doi.org/10.7567/ssdm.2004.h-1-4.

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