De-pinning of contact line of droplets on rough surfaces

24th Condensed Matter Days National Conference

Madhurima, V.^1 ; Nilavarasi, K.^1

Department of Physics, School of Basic and Applied Sciences, Central University of Tamil Nadu, Thiruvarur

610101, India^1

关键词: Breath figures;    Droplet pattern;    Ethanol vapours;    Hydrophobic groups;    Over-constrained;    Pattern formation;    Rough surfaces;    Saturated vapour;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/765/1/012001/pdf
DOI  :  10.1088/1742-6596/765/1/012001

来源: IOP

【 摘 要 】

The present study reports the formation of self-assembled droplet pattern on the PDMS polymer coated over grooved side of DVD under saturated vapours of alcohols. Comparison of the results with breath figures formed over unconstrained side of DVD is made. Four different environments namely methanol, ethanol, 2-propanol and n-butanol are used for the analysis. It is observed that the pattern formation occurs with methanol and ethanol vapours and not with 2-propanol and n-butanol. The difference is pattern formation with different alcohols is attributed to the variation in chain length and the presence of hydrophobic groups in alcohols, as given by Traube's rule. The distortion of patterns over constrained surface is attributed to the depinning of contact lines.