Path-programmable water droplet manipulations on an adhesion controlled superhydrophobic surface

Jungmok Seo, Seoung Ki Lee, Jaehong Lee, Jung Seung Lee, Hyukho Kwon, Seung Woo Cho, Jong Hyun Ahn, Taeyoon Lee

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Here, we developed a novel and facile method to control the local water adhesion force of a thin and stretchable superhydrophobic polydimethylsiloxane (PDMS) substrate with micro-pillar arrays that allows the individual manipulation of droplet motions including moving, merging and mixing. When a vacuum pressure was applied below the PDMS substrate, a local dimple structure was formed and the water adhesion force of structure was significantly changed owing to the dynamically varied pillar density. With the help of the lowered water adhesion force and the slope angle of the formed dimple structure, the motion of individual water droplets could be precisely controlled, which facilitated the creation of a droplet-based microfluidic platform capable of a programmable manipulation of droplets. We showed that the platform could be used in newer and emerging microfluidic operations such as surface-enhanced Raman spectroscopy with extremely high sensing capability (10-15 M) and in vitro small interfering RNA transfection with enhanced transfection efficiency of ∼80%.

Original languageEnglish
Article number12326
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Jul 23

All Science Journal Classification (ASJC) codes

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