Related Experiment Video
Updated: Aug 6, 2026
07:57
Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
Published on: November 10, 2014
8.0K
Reconfigurable Orbital Electrowetting for Controllable Droplet Transport on Slippery Surfaces
Jiayao Wu1, Huafei Li2, Yifan Zhou2
1The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China.
Micromachines
|June 27, 2025
Summary
We developed reconfigurable orbital electrowetting (ROEW) for precise droplet control on surfaces. This non-contact method enables customizable pathways for fluid handling in microfluidics and beyond.
Area of Science:
- Surface science
- Microfluidics
- Materials science
Background:
- Controllable droplet transport is essential for applications like water harvesting and bio-analysis.
- Existing methods often lack flexibility or require direct contact.
Purpose of the Study:
- To introduce a novel method for droplet transport control using reconfigurable orbital electrowetting (ROEW).
- To demonstrate dynamic handling and customizable pathways for droplet manipulation on slippery liquid-infused porous surfaces (SLIPS).
Main Methods:
- Utilizing reconfigurable orbital electrowetting (ROEW) on inclined SLIPS.
- Employing non-contact reconfiguration of orbital electrodes to modulate wettability.
- Printing charge-orbit patterns for stable wettability pathways.
Main Results:
- Achieved controllable, continuous droplet transport via customized wettability pathways.
- Demonstrated dynamic handling, including droplet sorting and mixing, through electrode reconfiguration.
- Showcased the flexibility and reconfigurability of the ROEW method.
Conclusions:
- ROEW offers a new approach for reconfigurable, electrode-free microfluidic systems.
- The non-contact, dynamic nature of ROEW enhances droplet manipulation capabilities.
- This method provides a versatile platform for advanced microfluidic applications.
Related Concept Videos
01:17Open and closed-loop control systems
Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...
01:22Controller Configurations
Controller configurations are crucial in a car's cruise control system because they manage speed over time to maintain a consistent pace regardless of road conditions, thereby meeting design goals. In traditional control systems, fixed-configuration design involves predetermined controller placement. System performance modifications are known as compensation.
Control-system compensation involves various configurations, most commonly series or cascade compensation, in which the controller aligns...
Control-system compensation involves various configurations, most commonly series or cascade compensation, in which the controller aligns...
01:26PD Controller: Design
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
01:25Directional Relays
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
01:27Laminar Flow
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
01:28Pipe Flowrate Measurement: Problem Solving
A spray tank system is engineered to uniformly distribute a pest-control liquid across plants by using a pressurized mechanism. The tank, pressurized to 150 kPa, holds the pesticide at a height of 0.80 meters. Liquid flows from the tank through a 1.9 meter pipe with a diameter of 0.015 meters, angled at 0.698 radians, ultimately reaching a 0.007 meter nozzle that sprays the pesticide. Accurate calculation of the system's flow rate is crucial to ensure uniform application, and this is achieved...