TY - JOUR
T1 - In Situ Control of Underwater-Pinning of Organic Droplets on a Surfactant-Doped Conjugated Polymer Surface
AU - Xu, Wei
AU - Xu, Jian
AU - Choi, Chang Hwan
AU - Yang, Eui Hyeok
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/11/25
Y1 - 2015/11/25
N2 - Controlling the pinning of organic droplets on solid surfaces is of fundamental and practical interest in the field of material science and engineering, which has numerous applications such as surface cleaning, water treatment, and microfluidics. Here, a rapid in situ control of pinning and actuation of organic droplets is demonstrated on dodecylbenzenesulfonate-doped polypyrrole (PPy(DBS)) surfaces in an aqueous environment via an electrochemical redox process. A dramatic change of the pinning results from the transport of DBS- molecules between the PPy(DBS) surface and the aqueous environment, as well as from a simultaneous alternation of the surface oleophobicity to organic liquids during the redox process. This in situ control of the droplet pinning enables a stop-and-go droplet actuation, applicable to both polar and apolar organic droplets, at low voltages (μ0.9 V) with an extremely low roll-off angle (μ0.4°).
AB - Controlling the pinning of organic droplets on solid surfaces is of fundamental and practical interest in the field of material science and engineering, which has numerous applications such as surface cleaning, water treatment, and microfluidics. Here, a rapid in situ control of pinning and actuation of organic droplets is demonstrated on dodecylbenzenesulfonate-doped polypyrrole (PPy(DBS)) surfaces in an aqueous environment via an electrochemical redox process. A dramatic change of the pinning results from the transport of DBS- molecules between the PPy(DBS) surface and the aqueous environment, as well as from a simultaneous alternation of the surface oleophobicity to organic liquids during the redox process. This in situ control of the droplet pinning enables a stop-and-go droplet actuation, applicable to both polar and apolar organic droplets, at low voltages (μ0.9 V) with an extremely low roll-off angle (μ0.4°).
KW - actuation
KW - droplets
KW - pinning
KW - polypyrrole
KW - surfactants
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U2 - 10.1021/acsami.5b07589
DO - 10.1021/acsami.5b07589
M3 - Article
AN - SCOPUS:84948671704
SN - 1944-8244
VL - 7
SP - 25608
EP - 25617
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 46
ER -