Nanoparticles confined in small volumes exhibit functional properties different from that of the bulk material. Furthermore, the smaller the volume available then the greater the effects of confinement are observed to be. Metallic nanoparticles encapsulated within carbon nanotubes have been proposed for many applications ranging from catalysis to quantum storage devices. In this study we examin...

Numerical simulations of two-dimensional late-stage coarsening for nucleation and growth ~Ostwald ripening! are performed at large-area fractions without shape restrictions. We employ efficient computational methods that allow us to study large systems. The free energy of the system we consider is composed of two different curves. Thus, the system consists of a set of isolated particles even at...

A self-assembly process is reported in which spiral patterns of gold nanoparticles form on silicon surfaces during the epitaxial crystallization of thin gold-silicon alloy layers. This behavior is observed only for gold concentrations above a critical value and is shown to result from two-dimensional compositional banding of a liquid alloy layer during the crystallization process. The compositi...

Abstract Ostwald ripening of gas bubbles is a thermodynamic process for mass transfer, which important both foam enhanced oil recovery and geological CO 2 storage. We present methodology simulating ganglia surrounded by liquid in arbitrary pore geometries. The method couples conservative level set model capillary-controlled displacement ghost-bubble technique that calculates transfer based on d...

Ostwald ripening of trapped bubbles in porous media is relevant to several subsurface (e.g., CO2 storage) and manufacturing fuel cells) applications. A fundamental question common both is: how does an initially heterogeneous distribution bubble sizes, PDFo, evolves towards a stable equilibrium distribution, PDFe? And what We develop pore-network model (PNM) that simulates the temporal evolution...

For this study, we prepared colloidal CdS quantum dots using 3-mercaptopropyltrimethoxysilane as capping agent. Colloidal CdS quantum dots were directly deposited on glass substrates by a spin-coating process. Coated substrates were heat-treated between 225°C and 325°C for various heat treatment time intervals to investigate the growth kinetics of the quantum dots. Results showed that sizes of ...