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• W4313643029 abstract "Here, we study the mesoscopic structures produced by applying a magnetic field either parallel or perpendicular to the substrate during the solvent evaporation of a colloidal solution of magnetic nanoparticles. The structure, thermodynamics, and dynamics in many physical and chemical systems are determined by an interplay of short-range isotropic and long-range anisotropic forces. Magnetic nanocrystals (γ-Fe 2 O 3 ) dispersed in solution are ideal model systems, since they are subjected to isotropic van der Waals and anisotropic dipolar forces. Two kinds of coating agents (citrate ions or carboxylic acids) are used to stabilize γ-Fe 2 O 3 nanocrystals in solution. The lengths of the alkyl chains for the carboxylic acids C n H 2 n + 1 COOH vary from n = 2 to 11. The colloidal solutions are evaporated under a magnetic field parallel to the substrate. At the end of evaporation, the final mesoscopic organizations markedly differ with the coating. An abrupt transition of γ-Fe 2 O 3 nanocrystal organization from chain-like to random structures. This is explained by Brownian dynamics simulations in terms of changes in van der Waals interactions with the nanocrystal contact distance tuned by the length of the coating molecules. The weak dipole–dipole interactions between γ-Fe 2 O 3 nanocrystals are usually not sufficient to result in the chain formation observed here. However, due to the van der Waals interactions, when the nanocrystal contact distance is short enough, clusters of nanocrystals are formed during the evaporation process. These clusters exhibit large dipole moments compared with a single particle that explains the formation of chain-like structures. Conversely, when the nanocrystal contact distance is too long, no nanocrystal aggregation occurs, and a random distribution of maghemite nanocrystals is obtained even in a magnetic field. Mesoscopic patterns of Co nanoparticles are produced by applying a magnetic field perpendicular to the plane of a substrate. The mesoscopic patterns markedly differ with the size distribution of Co nanocrystals. During the evaporation process, when the nanoparticle concentration is large enough, a liquid–gas transition takes place. The Co nanocrystals self-assemble in columns. When the size distribution is low enough, the columns are highly stable, whereas with a large size distribution, they tend to coalesce to produce labyrinths. Hence, a transition from well-defined columns to labyrinths takes place when the size distribution of nanoparticles increases. This is the first example that shows an increase in the stiffness of 3D superlattices compared with disordered assemblies as it is demonstrated in Chapter 12." @default.
• W4313643029 created "2023-01-07" @default.
• W4313643029 date "2023-01-06" @default.
• W4313643029 modified "2023-10-02" @default.
• W4313643029 title "Mesostructures of Magnetic Nanocrystals Subjected to Applied Magnetic Field" @default.
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• W4313643029 doi "https://doi.org/10.1002/9783527344796.ch6" @default.
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