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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Extended random sequential adsorption model of irreversible deposition processes: From simulations to experiments
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Extended random sequential adsorption model of irreversible deposition processes: From simulations to experiments

机译：不可逆沉积过程的扩展随机顺序吸附模型：从模拟到实验

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摘要

An experimental study of the irreversible deposition of colloidal particles of various radii R on a solid surface is presented over a wide range of the Peclet number, Pe, or reduced radius R~* (Pe = R~*4). The experimental data are analyzed by means of a new generalized random sequential adsorption model that takes explicitly the diffusion of the particles during the deposition into account. It allows descrip- tion of the continuous transition from a random sequential adsorption-like to a ballistic-like deposition behavior. It de- pends on three parameters: d_s, related to the diffusion of the particles before adhesion, n_s, related to the number of allowed adhesion trials of a particle, and R_e., representing the effective particle radius. The model allows accounting for all of the experimental observations relative to the radial distribution functions and the number density fluctuations over the whole coverage range and all investigated values of R~*. In addition, it is found that d_s/R is proportional to R~*-2 as expected for a diffusional process. Moreover, the parameters d_s and n_s appear to be connected through the empirical relation (d_s/ R)n_s~2/3 = C, where C is found to be of the order of 50. This unique statistical model allows an accurate description of the irreversible deposition process, whatever the influence of gravity with respect to diffusion.
机译：在广泛的佩克利数，Pe或减小的半径R〜*（Pe = R〜* 4）的范围内，进行了各种半径R的胶体粒子在固体表面上不可逆沉积的实验研究。通过新的广义随机顺序吸附模型分析实验数据，该模型明确考虑了沉积过程中颗粒的扩散。它可以描述从随机顺序吸附到弹道沉积行为的连续转变。它取决于三个参数：d_s，与附着之前颗粒的扩散有关； n_s，与粒子允许的附着试验次数有关； R_e。，代表有效粒子半径。该模型可以考虑所有与径向分布函数有关的实验观察结果，以及在整个覆盖范围内的数密度波动以及所有R〜*的研究值。另外，发现d_s / R正比于扩散过程所期望的R〜* -2。此外，参数d_s和n_s似乎通过经验关系（d_s / R）n_s〜2/3 = C连接，其中C的数量级为50。这种独特的统计模型可以对不可逆的沉积过程，无论重力对扩散的影响如何。

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