Chemically frozen phase separation in an adsorbed layer.
Chemically frozen phase separation in an adsorbed layer.
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吸附层中的化学冷冻相分离。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Dewel
中科院分区：
文献类型：
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作者：
Verdasca;Borckmans;Dewel
提出了一种在表面形成吸附岛的机理。它是基于吸附流体中的相分离冻结，受吸附-解吸动力学控制。这种描述依赖于Cahn-Hilliard方程，并辅之以化学起源的源项。在弱偏析区域，该模型产生简谐的六角形或条形结构。由弱非线性方法得到的振幅方程与数值模拟结果很好地吻合，解释了模式竞争。对高偏析区域进行了数值模拟研究，得到了模拟对称结构。
A mechanism for the formation of adsorbate islands on a surface is proposed. It is based on the freezing of the phase separation in the adsorbed fluid, controlled by adsorption-desorption kinetics. The description relies on the Cahn-Hilliard equation complemented by source terms of chemical origin. In the weak segregation regime the model produces harmonic hexagonal or striped structures. Amplitude equations resulting from a weakly nonlinear approach give excellent agreement with the numerical simulations to explain the pattern competition. The high segregation regime is studied numerically producing structures of analog symmetries.