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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

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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...
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Characteristics of Dry Friction01:21

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Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
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Rheological and tribological characterization of novel modified graphene/oil-based nanofluids using force microscopy.

Mustafa Oguzhan Caglayan1,2

  • 1Faculty of Engineering, Bioengineering Department, Bilecik Seyh Edebali University, Bilecik, Turkey.

Microscopy Research and Technique
|November 10, 2020
PubMed
Summary

Silane-modified graphene nanosheets in base oil enhance lubrication and reduce wear. These novel nanofluids show improved tribological performance and thermal conductivity without surfactants.

Keywords:
friction force microscopygraphene nanosheetslubricationmicromechanical methodsnanofluidsphase-contrast microscopy

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Nanofluids are garnering significant research interest for their unique thermal and rheological properties.
  • Graphene nanosheets possess desirable physicochemical properties, making them suitable for lubricant applications.
  • Developing effective nanofluids without surfactants or dispersants is a key challenge.

Purpose of the Study:

  • To enhance the lubrication and anti-wear properties of base oil using silane-modified graphene nanosheets.
  • To investigate the tribological behavior of these novel nanofluids at the nanoscale.
  • To evaluate the performance of the nanofluids without the need for surfactants or dispersants.

Main Methods:

  • Preparation of nanofluids by dispersing silane-modified graphene nanosheets in base oil.
  • Utilizing scanning probe microscopy, phase-contrast microscopy, and friction force microscopy to analyze nanofluidic film behavior.
  • Characterizing tribological performance, including friction coefficient and wear, and thermal conductivity.

Main Results:

  • The prepared nanofluids exhibited non-Newtonian behavior at higher concentrations and shear rates.
  • Significant improvements were observed: up to 43% reduction in friction coefficient, 91% reduction in wear, and 46% increase in thermal conductivity compared to base oil.
  • Challenges in friction force microscopy due to stick-slip behavior provided insights into nanoscale tribological factors.

Conclusions:

  • Silane-modified graphene nanosheets effectively improve the tribological performance and thermal conductivity of base oil.
  • The developed nanofluids offer a surfactant-free solution for enhanced lubrication and wear resistance.
  • The study demonstrates the potential of graphene-based nanofluids in demanding tribological applications.