Anomalous diffusion mediated by atom deposition into a porous substrate

Thin film growth by using random shape cluster deposition

The growth of a rough and porous thin surface by deposition of randomly shaped clusters with different sizes over an initially flat linear substrate is simulated, using Monte Carlo technique. Unlike the ordinary Random Deposition, our approach results in aggregation of clusters which produces a porous bulk with correlation along the surface and the surface saturation occurs in long enough deposition times. The scaling exponents; the growth, roughness, and dynamic exponents are calculated based on the time scale. Moreover, the porosity and its dependency to the time and clusters size are also c…

Deposition control of model glasses with surface-mediated orientational order

We introduce a minimal model of solid-forming anisotropic molecules that displays, in thermal equilibrium, surface orientational order without bulk orientational order. The model reproduces the nonequilibrium behavior of recent experiments in that a bulk nonequilibrium structure grown by deposition contains regions of orientational order characteristic of the surface equilibrium. This order is deposited in general in a nonuniform way, because of the emergence of a growth-poisoning mechanism that causes equilibrated surfaces to grow slower than non-equilibrated surfaces. We use evolutionary met…

Transition from compact to porous films in deposition with temperature activated diffusion

We study a thin film growth model with temperature activated diffusion of adsorbed particles, allowing for the formation of overhangs and pores, but without detachment of adatoms or clusters from the deposit. Simulations in one-dimensional substrates are performed for several values of the diffusion-to-deposition ratio R of adatoms with a single bond and of the detachment probability epsilon per additional nearest neighbor (NN), respectively with activation energies are Es and Eb. If R and epsilon independently vary, regimes of low and high porosity are separated at 0.075 < epsilon_c < 0.09, w…

Random deposition of particles of different sizes

We study the surface growth generated by the random deposition of particles of different sizes. A model is proposed where the particles are aggregated on an initially flat surface, giving rise to a rough interface and a porous bulk. By using Monte Carlo simulations, a surface has grown by adding particles of different sizes, as well as identical particles on the substrate in (1 + 1) dimensions. In the case of deposition of particles of different sizes, they are selected from a Poisson distribution, where the particle's sizes may vary by one order of magnitude. For the deposition of identical p…

弹性异质性支配了软多孔晶体中的异常尺度行为

Elastic heterogeneity governs anomalous scaling in a soft porous crystal

研究揭示弹性异质性通过调控吸附动力学，导致软多孔晶体中出现尺寸依赖性吸收、表面褶皱及异常动态尺度等现象。

生长动力学对多孔膜中溶质扩散的影响

Effects of the growth kinetics on solute diffusion in porous films

该研究通过模拟不同生长动力学参数和厚度的三维多孔膜中溶质的扩散，揭示了生长动力学、膜结构与输运参数的关系，为高性能多孔材料开发提供依据。