Self-organised microdots formed by dewetting in a highly volatile liquid

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• 作者：Rita Toth^a ; ^{Rita.Toth@empa.ch} ; Jakob Heier^b ; Jean-Nicolas Tisserant^b ; Enyedy Eva Anna^c ; Artur Braun^a ; Thomas Graule^a ; ^d
• 关键词：Hexagonal and tetragonal order ; Dewetting ; Self-organisation ; Iron oxide microstructure ; Microdot ; Stick&ndash ; slip motion ; Receding contact line
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 July, 2012
• 卷：378
• 期：1
• 页码：201-209
• 文件大小：1243 K

摘要

Dewetting induced self-organisation was used to prepare an ordered microstructure from a highly volatile liquid. Dewetting of an evaporating iron oxide precursor solute on silicon substrate resulted in arrays of microdots with nearly hexagonal and tetragonal symmetries. Ordered structures form either by stick-slip motion or fingering instability at the receding contact line of evaporating droplets. Subsequent thermal treatment at 550 掳C yields crystalline Fe₂O₃ microdots with a diameter range of 1-4 渭m. The size, density and shape of the microdots can be changed by using patterned substrates with different surface energies.