Effect of softness of polydimethylsiloxane on the hydrophobicity of pillar-like patterned surfaces

Yeh, Yu-Hao; Cho, Kuan-Hung; Chen, Li-Jen

doi:10.1039/c1sm06649h

Cited by 24 publications

(28 citation statements)

References 38 publications

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“…Microscale arrays of pillars and lamellae, whose SEM (scanning electron microscopy) images are shown in Figs. 1(b) and 1(c), respectively, are fabricated by soft lithography 23 using the mixture of PDMS (polydimethylsiloxane) prepolymer base and the curing agent in a weight ratio of 10:1. The mixture is poured onto a negative patterned silicon master prepared by deep reactive ion etching and treated with an antisticking agent (octafluorocyclobutane, C 4 F 8 ), and degassed under vacuum for 1 h to eliminate air bubbles.…”

Section: Methodsmentioning

confidence: 99%

Evaporation-driven clustering of microscale pillars and lamellae

Kim

2016

Physics of Fluids

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As a liquid film covering an array of micro-or nanoscale pillars or lamellae evaporates, its meniscus pulls the elastic patterns together because of capillary effects, leading to clustering of the slender microstructures. While this elastocapillary coalescence may imply various useful applications, it is detrimental to a semiconductor manufacturing process called the spin drying, where a liquid film rinses patterned wafers until drying. To understand the transient mechanism underlying such self-organization during and after liquid evaporation, we visualize the clustering dynamics of polymer micropatterns. Our visualization experiments reveal that the patterns clumped during liquid evaporation can be re-separated when completely dried in some cases. This restoration behavior is explained by considering adhesion energy of the patterns as well as capillary forces, which leads to a regime map to predict whether permanent stiction would occur. This work does not only extend our understanding of micropattern stiction, but also suggests a novel path to control and prevent pattern clustering.

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Section: Methodsmentioning

confidence: 99%

Evaporation-driven clustering of microscale pillars and lamellae

Kim

2016

Physics of Fluids

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“…We measured the CA of the water droplet as a function of time. The dynamics of CA values of water on these fabricated pillars are displayed in Figure SI- [43][44][45] High hysteresis is expected for wetted surfaces H5, H10 and H15. This caused by a loss on hydrophobicity followed by droplet impalement in the micropillars.…”

Section: Substrates Decorated With Micropillar Arraysmentioning

confidence: 99%

Pattern Formation by Staphylococcus epidermidis via Droplet Evaporation on Micropillars Arrays at a Surface

et al. 2016

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We evaluate the effect of epoxy surface structuring on the evaporation of water droplets containing Staphylococcus epidermidis (S. epidermidis). During evaporation, droplets with S. epidermidis cells yield to complex wetting patterns such as the zipping-wetting1-3 and the coffee-stain effects. Depending on the height of the microstructure, the wetting fronts propagate circularly or in a stepwise manner, leading to the formation of octagonal or square-shaped deposition patterns.4,5 We observed that the shape of the dried droplets has considerable influence on the local spatial distribution of S. epidermidis deposited between micropillars. These changes are attributed to an unexplored interplay between the zipping-wetting1 and the coffee-stain6 effects in polygonally shaped droplets containing S. epidermidis. Induced capillary flows during evaporation of S. epidermidis are modeled with polystyrene particles. Bacterial viability measurements for S. epidermidis show high viability of planktonic cells, but low biomass deposition on the microstructured surfaces. Our findings provide insights into design criteria for the development of microstructured surfaces on which bacterial propagation could be controlled, limiting the use of biocides.

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“…10c. In addition, the advancing and receding contact angles depend upon drop volume [40] and viewing angle due to the contact line distortions.…”

Section: Drop Size Effect On the Contact Angle Hysteresismentioning

confidence: 99%

Modeling contact angle hysteresis of a liquid droplet sitting on a cosine wave-like pattern surface

Promraksa

Chen

2012

Journal of Colloid and Interface Science

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Effect of softness of polydimethylsiloxane on the hydrophobicity of pillar-like patterned surfaces

Cited by 24 publications

References 38 publications

Evaporation-driven clustering of microscale pillars and lamellae

Evaporation-driven clustering of microscale pillars and lamellae

Pattern Formation by Staphylococcus epidermidis via Droplet Evaporation on Micropillars Arrays at a Surface

Modeling contact angle hysteresis of a liquid droplet sitting on a cosine wave-like pattern surface

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