scholarly journals Switchable Wettability and Adhesion of Micro/Nanostructured Elastomer Surface via Electric Field for Dynamic Liquid Droplet Manipulation

2020 ◽  
Vol 7 (18) ◽  
pp. 2000772 ◽  
Author(s):  
Yan Li ◽  
Jinrong Li ◽  
Liwu Liu ◽  
Yufeng Yan ◽  
Qiuya Zhang ◽  
...  
Keyword(s):  
Electric Field ◽  
Liquid Droplet ◽  
Droplet Manipulation

Extraction of Cations from an Ionic Liquid Droplet in a Dielectric Liquid under Electric Field

2014 ◽  
Vol 5 (17) ◽  
pp. 3021-3025 ◽  
Author(s):  
Myung Mo Ahn ◽  
Do Jin Im ◽  
Jang Gyu Kim ◽  
Dong Woog Lee ◽  
In Seok Kang
Keyword(s):  
Ionic Liquid ◽  
Electric Field ◽  
Liquid Droplet ◽  
Dielectric Liquid

DEVELOPMENT OF A NON-CONTINUOUS MICRO-FLOW OPTO-WETTING DROPLET MANIPULATION TECHNOLOGY

2005 ◽  
Vol 17 (06) ◽  
pp. 293-299 ◽  
Author(s):  
MING-YIH LEE ◽  
HUNG-CHIA LIN ◽  
HUNG-WEI CHIANG ◽  
WEI-XUN LEE ◽  
XIAN-DONG HUANG
Keyword(s):  
Surface Tension ◽  
Uv Light ◽  
Liquid Droplet ◽  
Average Particle Size ◽  
Base Material ◽  
Material Surface ◽  
Average Particle ◽  
Hydrophilic Property ◽  
Manipulation System ◽  
Droplet Manipulation

The aim of this study is to develop a non-continuous droplet manipulation technology in contrast to conventional continuous flow micro-fluidic systems. The droplets were manipulated based on the proposed opto-wetting effect. In addition, an experimental ultraviolet (UV) light actuated droplet manipulation system was developed for verifying the opto-wetting droplet manipulation. The proposed opto-wetting effect was achieved by utilizing ultraviolet to activate oxidation-reduction mechanism of nano-TiO2 photo catalyst coated base material. The water-affinity of the base material will changed due to the decreased free-energy of the material surface. Therefore, the contact angle between the liquid droplet and base material will also be changed which facilitates droplet manipulability. The main components of the proposed ultraviolet (UV) light actuated droplet manipulation system include ultraviolet masking device, moving platform and main frame structure. System software and user interface were designed by using Microsoft Visual Basic 6.0 toolkit. Upon completion of the proposed system, experiments were carried out to verify system functionalities. Follow by the controlled variable optimization using Taguchi method and liquid droplet manipulation experiments. The experiment results indicate that by exposure to 6.8mW UV light, the surface tension and hydrophilic property of nano-TiO2 (anatase type, 3.5% concentration, PH 1.5, and with average particle size of 69 nm) coated base material will changed. The change of surface tension and hydrophilic property were critical for droplet manipulation. The moving speed of the liquid droplet was measured as 3.33mm/sec. The results suggest that the opto-wetting system may be effective to overcome the shortcoming of traditional opto-electrowetting technique. The proposed opto-wetting droplet manipulation system could potentially applied for manipulating biomedical or pathological test specimens in the future.

A Platform for Electric Field Aided and Wire-Guided Droplet Manipulation

Small ◽  
2016 ◽  
Vol 13 (5) ◽  
pp. 1601691 ◽  
Author(s):  
Yanzhen Zhang ◽  
Gunther Wittstock
Keyword(s):  
Electric Field ◽  
Droplet Manipulation

Droplet Manipulation by an External Electric Field for Crystalline Film Growth

Langmuir ◽  
2013 ◽  
Vol 29 (30) ◽  
pp. 9592-9597 ◽  
Author(s):  
Takeshi Komino ◽  
Hirokazu Kuwabara ◽  
Masaaki Ikeda ◽  
Masayuki Yahiro ◽  
Kazuo Takimiya ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Film Growth ◽  
Crystalline Film ◽  
Droplet Manipulation

scholarly journals From electrodiffusion theory to the electrohydrodynamics of leaky dielectrics through the weak electrolyte limit

2018 ◽  
Vol 855 ◽  
pp. 67-130 ◽  
Author(s):  
Yoichiro Mori ◽  
Y.-N. Young
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Liquid Droplet ◽  
Debye Length ◽  
Ionic Concentration ◽  
Liquid Interface ◽  
Dielectric Fluids ◽  
Debye Layer ◽  
Tm Model ◽  
Leaky Dielectric

The Taylor–Melcher (TM) model is the standard model for describing the dynamics of poorly conducting leaky dielectric fluids under an electric field. The TM model treats the fluids as ohmic conductors, without modelling the underlying ion dynamics. On the other hand, electrodiffusion models, which have been successful in describing electrokinetic phenomena, incorporate ionic concentration dynamics. Mathematical reconciliation of the electrodiffusion picture and the TM model has been a major issue for electrohydrodynamic theory. Here, we derive the TM model from an electrodiffusion model in which we explicitly model the electrochemistry of ion dissociation. We introduce salt dissociation reaction terms in the bulk electrodiffusion equations and take the limit in which the salt dissociation is weak; the assumption of weak dissociation corresponds to the fact that the TM model describes poor conductors. Together with the assumption that the Debye length is small, we derive the TM model with or without the surface charge convection term depending upon the scaling of relevant dimensionless parameters. An important quantity that emerges is the Galvani potential (GP), the jump in voltage across the liquid–liquid interface between the two leaky dielectric media; the GP arises as a natural consequence of the interfacial boundary conditions for the ionic concentrations, and is absent under certain parametric conditions. When the GP is absent, we recover the TM model. Our analysis also reveals the structure of the Debye layer at the liquid–liquid interface, which suggests how interfacial singularities may arise under strong imposed electric fields. In the presence of a non-zero GP, our model predicts that the liquid droplet will drift under an imposed electric field, the velocity of which is computed explicitly to leading order.

scholarly journals Droplet manipulation on a structured shape memory polymer surface

Lab on a Chip ◽  
2017 ◽  
Vol 17 (10) ◽  
pp. 1793-1801 ◽  
Author(s):  
Jun Kyu Park ◽  
Seok Kim
Keyword(s):  
Shape Memory ◽  
Liquid Droplet ◽  
Shape Memory Polymer ◽  
Polymer Surface ◽  
Morphological Gradient ◽  
Gradient Forces ◽  
Droplet Manipulation

Manipulation of a liquid droplet on a structured shape memory polymer surface with thermal Marangoni and morphological gradient forces.

Ultrafast single-droplet bouncing actuator with electrostatic force on superhydrophobic electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 66729-66737 ◽  
Author(s):  
Seulah Lee ◽  
Sanggeun Lee ◽  
Hyunseok Hwang ◽  
Juree Hong ◽  
Soonil Lee ◽  
...  
Keyword(s):  
Liquid Droplet ◽  
Electrostatic Force ◽  
Single Droplet ◽  
Droplet Manipulation ◽  
First Time

The ultrafast bouncing motion of a liquid droplet has been investigated for droplet manipulation with a single droplet actuator using an electrostatic force for the first time.

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