Related Experiment Video
Updated: Dec 31, 2025
08:02
Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
Published on: February 11, 2020
9.3K
Bioinspired Topological Surface for Directional Oil Lubrication
Xing Li1, Jiaqian Li2, Guangneng Dong1
1Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering , Xi'an Jiaotong University , Xi'an 710049 , China.
ACS Applied Materials & Interfaces
|January 4, 2020
Summary
Researchers developed a bioinspired surface with V-shaped posts for efficient, unidirectional lubricating oil transport. This surface design enables directional lubrication with varying friction properties, inspired by biological surfaces.
Area of Science:
- Surface science
- Tribology
- Bioinspired engineering
Background:
- Directional droplet transport is common on biological surfaces, inspiring engineered devices for energy and water applications.
- Guiding directional spreading of lubricating oils using bioinspired surface topography remains a challenge in the field of lubricity.
Purpose of the Study:
- To develop a bioinspired topological surface for efficient and unidirectional transport of lubricating oils.
- To investigate the mechanisms enabling long-range directional oil transportation.
Main Methods:
- Fabrication of a bioinspired surface textured with V-shaped posts in parallel channels.
- Analysis of precursor film propagation, droplet coalescence, and pinning effects.
Main Results:
- The developed surface enables efficient and unidirectional transport of various lubricating oils.
- A combination of precursor film dynamics and pinning effects drives the directional oil transport.
- The surface creates distinct zones with different lubrication properties, evidenced by varying friction coefficients.
Conclusions:
- The bioinspired V-shaped post surface effectively achieves directional oil transport.
- This technology holds potential for applications in directional lubrication and creating functional surfaces with tailored tribological properties.
More Related Videos
Related Concept Videos
01:23Design Example: Deciding Thickness of Lubricating Fluid in a Shaft
286
Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
286
01:25Design Example: Flow of Oil Through Circular Pipes
386
Understanding fluid flow behavior through pipes is critical in fluid mechanics, especially in applications like oil transportation through pipelines. Hagen-Poiseuille's law provides an exact solution derived from the Navier-Stokes equations for steady, incompressible, and laminar flow within a circular pipe. Hagen-Poiseuille's law helps determine the necessary pressure drop across a pipeline section by determining parameters like pipe length, radius, oil viscosity, and the desired volumetric...
386
01:22Surface Tension of Fluid
1.2K
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
1.2K
01:16Surface Tension and Surface Energy
2.8K
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
2.8K
03:22Colloids
20.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
20.4K