Many food products are produced in the form of emulsions and foams, and it is necessary to formulate these materials to achieve stability. This is accomplished by arresting coalescence and film drainage, or by minimizing the process of Ostwald ripening. For this purpose, additives such as proteins and biopolymers can be added to either diminish or eliminate these events. Many mechanisms have be...

In the conventional procedure of the preparation of aqueous semiconductor nanocrystals (NCs), the growth of NCs was mainly through the thermodynamics-favored Ostwald ripening process. It required additional energy to promote NC growth, such as reflux, hydrothermal method, microwave irradiation, and sonochemical synthesis. Energy-promoted growth usually led to the decomposition of mercapto-ligan...

An alternative phase-field model is presented for the simulation of microstructure evolution in polycrystalline materials existing of multiple phases and components. The model is able to treat concurrently phase transformations, diffusion controlled coarsening (Ostwald ripening) and grain growth. The equilibrium phase fractions and compositions are introduced using appropriate thermodynamic Gib...

In this work, the evolution of gas-filled cracks under gas implantation and subsequent annealing is studied on the basis of an elastic continuum approach. The observed growth limitation of He-filled nanocracks in SiC is attributed to their stabilization by the formation of circular dislocation dipoles. The formation and Ostwald ripening of bubble-loop complexes at elevated temperatures is model...

The influence of different combinations accelerated stress test (AST) protocols simulating load-cycle and start/stop conditions a proton exchange membrane fuel cell (PEMFC) vehicle is investigated on bimodal Pt/C catalyst. catalyst, prepared by mixing two commercial catalysts, serves as model system consists distinguishable size populations. change in mean particle was situ small-angle X-ray sc...

The first algorithm for Emulsion Stability Simulations (ESS) was presented at the V Conferencia Iberoamericana sobre Equilibrio de Fases y Diseño de Procesos [Luis, J.; García-Sucre, M.; Urbina-Villalba, G. Brownian Dynamics Simulation of Emulsion Stability In: Equifase 99. Libro de Actas, 1(st) Ed., Tojo J., Arce, A., Eds.; Solucion's: Vigo, Spain, 1999; Volume 2, pp. 364-369]. The former vers...

We report on the synthesis of CdSe/ZnX (X=S, Se) core/shell quantum dots from the CdO precursor through a convenient, one-pot approach. The defocusing stage (i.e., Ostwald Ripening) can be finely controlled to prepare nearly monodispersive core/shell quantum dots. The resulting particles have been characterized by their corresponding optical properties, energy dispersive spectroscopy, X-ray pho...

The growth kinetics of the mostly used physical vapor-phase deposition techniques -molecular beam epitaxy, sputtering, flash evaporation, and pulsed laser deposition-is investigated by rate equations with the aim of testing their suitability for the preparation of ultraflat ultrathin films. The techniques are studied in regard to the roughness and morphology during early stages of growth. We de...

Spontaneous formation of curved nanorods is generally unexpected, since curvature introduces strain energy. However, electron microscopy shows that under hydrothermal conditions, some nanorods grown by oriented attachment of small anatase particles on {101} surfaces are curved and dislocation free. Molecular dynamics simulations show that the lattice energy of a curved anatase rod is actually l...

This study details a scanning tunneling microscopy investigation into the mechanism of chiral grain growth in highly ordered, self-assembled monolayer films composed of cruciform pi-systems. Although the molecules themselves are achiral, when they adsorb from solution onto graphite, they adopt a gear-like conformation that, by virtue of the surface, is chiral. These handed subunits arrange them...