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

doi:10.1038/srep12326

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 journal › Article › peer-review

50 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 language	English
Article number	12326
Journal	Scientific reports
Volume	5
DOIs	https://doi.org/10.1038/srep12326
Publication status	Published - 2015 Jul 23

Bibliographical note

Funding Information:
This work was supported by the grant (2012-0006689, 2014R1A2A2A09053061, CASE-2014M3A6A5060933 and 2013R1A1A2A10061422) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology. This work was partially supported by the Yonsei University Future-leading Research Initiative. We thank the Tanaka Kikinzoku Kogyo K.K. for comments on the usage of silver nanoparticles.

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title = "Path-programmable water droplet manipulations on an adhesion controlled superhydrophobic surface",

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%.",

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AU - Cho, Seung Woo

AU - Ahn, Jong Hyun

AU - Lee, Taeyoon

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N2 - 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%.

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

Abstract

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