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Related Concept Videos

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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...
Two Components: Liquid–Liquid Systems01:27

Two Components: Liquid–Liquid Systems

A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
Viscosity of Fluid01:19

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.

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Updated: Jun 20, 2026

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Published on: February 6, 2016

Ionic liquid lubricants: designed chemistry for engineering applications.

Feng Zhou1, Yongmin Liang, Weimin Liu

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.

Chemical Society Reviews
|August 20, 2009
PubMed
Summary
This summary is machine-generated.

Ionic liquids (ILs) offer superior lubrication and anti-wear properties compared to conventional oils. This review details their tribological applications, mechanisms, and future potential in lubrication.

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Last Updated: Jun 20, 2026

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Area of Science:

  • Tribology
  • Materials Science
  • Lubrication Engineering

Background:

  • Ionic liquids (ILs) emerged as high-performance lubricants in 2001.
  • Significant research interest in ILs for tribology due to their exceptional properties.
  • ILs demonstrate remarkable lubrication and anti-wear capabilities over conventional oils.

Purpose of the Study:

  • To provide a comprehensive review of the current state-of-the-art research on ionic liquid lubricants.
  • To discuss the tribological properties, mechanisms, and applications of IL lubricants.
  • To identify current challenges and propose potential solutions for IL-based lubrication.

Main Methods:

  • Literature review of ionic liquid lubrication research.
  • Analysis of tribological data for ILs as lubricants, additives, and thin films.
  • Discussion of lubrication mechanisms and performance evaluation.

Main Results:

  • ILs exhibit excellent lubrication and anti-wear performance.
  • Effective application of ILs as bulk lubricants, additives, and thin films.
  • Understanding of lubrication mechanisms involving ILs.

Conclusions:

  • Ionic liquids represent a promising class of advanced lubricants.
  • Further research is needed to address current challenges and optimize IL lubricant performance.
  • ILs are poised to play a significant role in future lubrication technologies.