Coerced mechanical coarsening of nanoparticle assemblies

Abstract

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Nanowire directed diffusion limited aggregation growth of nanoparticles

“…The particles follow the solution's capillary flow from the center to the edge and self-organize in different ways depending on the position with respect to the drop (edge, intermediate zones, and center). The physical characteristics of nanoparticles (mobility, weight, shape, diffusivity, and density in the solution) influence the growth, and different regimes (spinodal and fluxional) have been predicted and experimentally verified [1,2,[5][6][7]. Under certain conditions the self-assembling of particles follows the so called Diffusion Limited Aggregation (DLA) growth.…”

Controlling Pattern Formation in Nanoparticle Assemblies via Directed Solvent Dewetting

“…Their versatility makes them ideal building blocks for the next generation of nanoscale electronic devices. When deposited on a surface, colloidal nanoparticles form a diverse array of patterns [1][2][3][4][5][6][7][8] for which the behavior of the solvent plays a key role. Isolated islands, wormlike domains, continuous labyrinthine patterns, and polygonal networks can each be produced by varying the experimental conditions [1,5,9,10].…”

“…When deposited on a surface, colloidal nanoparticles form a diverse array of patterns [1][2][3][4][5][6][7][8] for which the behavior of the solvent plays a key role. Isolated islands, wormlike domains, continuous labyrinthine patterns, and polygonal networks can each be produced by varying the experimental conditions [1,5,9,10]. Although there have been impressive recent examples of the exploitation of dewetting to form stripes of nanoparticles [6,7,11] and the use of structured substrates to direct dewetting in polymer systems has been studied in some depth [12 -14], spatial control of dewetting-induced pattern formation in 2D assemblies of nanoparticles has to date not been demonstrated.…”

Anisotropic Assembly of Colloidal Nanoparticles: Exploiting Substrate Crystallinity

“…As expected for deposition onto an amorphous substrate, nanoparticle assemblies on native oxide-terminated silicon are structurally isotropic. In particular, two-dimensional Fourier transforms show no evidence of orientational order [16,18]. Fig.…”

“…Thiol-passivated Au nanoparticles, when deposited onto native oxide-terminated silicon substrates, form a panoply of non-equilibrium patterns [14][15][16][17][18][19] arising, as for many other colloidal nanoparticle-substrate systems, from the coupling of the particle and solvent dynamics [20][21][22]. As expected for deposition onto an amorphous substrate, nanoparticle assemblies on native oxide-terminated silicon are structurally isotropic.…”