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• W4313642997 abstract "Elastic properties of highly ordered 3D superlattices of metal nanocrystals are deduced from nanoindentation measurements microscope. Chapter 4 demonstrates the simultaneous growth of interfacial and precipitated 3D superlattices. For the precipitated 3D superlattices characterized by a thickness larger than 1 μm, the Oliver and Pharr model is used to determine the elastic moduli, whose range is measured in GPa and which decrease with larger nanocrystal size. For the interfacial 3D superlattices, a plate model is applied in addition to the Oliver and Pharr model and confirms independently that the interfacial films are very soft based on Young's modulus value in the range of MPa. These changes in the Young's modulus are related to the 3D superlattice growth mechanism. Furthermore, using single domain and polycrystalline nanocrystals as building blocks, the stiffness of 3D superlattices can be tuned upon change in relative amounts of single and polycrystalline nanocrystals. The Young's modulus and hardness of fcc Au 3D superlattices obtained out of equilibrium are in the range of few tenths of MPa to a few GPa. They decrease with increasing nanocrystal size, depending on the number of carbon atoms of the ligand chain length ( n ) and the solvent vapor pressure during the solvent evaporation process. This trend is attributed to a change in the conformation of flexible ligands with n and to free thiol containing molecules trapped in the 3D superlattice lattices. A hierarchical mechanical behavior of thick nanocrystal 3D superlattices induced by the crystalline structure (nanocrystallinity) or by the length of the coating agent of Co nanocrystals as building blocks. Increasing the nanocrystal shape anisotropy of Co nanocrystals through the control of their nanocrystallinity induces a higher level of ordering with both translational and orientational alignment of nanocrystals within the 3D superlattices. The hierarchy, i.e. from the atomic lattice within the nanocrystals to the nanocrystal superlattice within 3D superlattice, is correlated with marked changes in the Young's modulus of 3D superlattices. It increases from amorphous-Co, to ε - Co and to hcp-Co, respectively. Moreover, for 3D superlattices of amorphous-Co nanocrystals, the Young's modulus decreases by 1 order of magnitude by reducing the alkyl chain length of the ligands coated on Co nanocrystals from C 18 (oleic acid) to C 12 (lauric acid). Very surprisingly, with Ag nanocrystals as building blocks, the Young moduli markedly decreases compared to Co and Au nanocrystal assemblies. The mesoscopic features of Co nanoparticles deposited on a substrate marked change with the size distribution of nanoparticles." @default.
• W4313642997 created "2023-01-07" @default.
• W4313642997 date "2023-01-06" @default.
• W4313642997 modified "2023-10-02" @default.
• W4313642997 title "Mechanical Properties of 3D Superlattices" @default.
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• W4313642997 doi "https://doi.org/10.1002/9783527344796.ch12" @default.
• W4313642997 hasPublicationYear "2023" @default.
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