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Related Concept Videos

Colloids03:22

Colloids

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

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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.
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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
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Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
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Smart-Responsive Colloidal Capsules as an Emerging Tool to Design a Multifunctional Lubricant Additive.

Sang T Pham1, A Kiet Tieu1, Vitor Sencadas1

  • 1School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia.

ACS Applied Materials & Interfaces
|February 3, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces smart-responsive colloidal capsules for lubricants, overcoming microcapsule breakage issues. These capsules significantly enhance lubricity and achieve ultra-low friction under extreme conditions.

Keywords:
frictionh-BN nanosheetshigh-temperature tribologyhybrid materialsmart responsivewear

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Area of Science:

  • Materials Science
  • Tribology
  • Colloid Science

Background:

  • Microencapsulation offers controlled release but faces shell breakage in lubricants under stress.
  • Shell fragments negatively impact friction and wear, hindering tribological applications.
  • Existing microencapsulation methods are limited in lubricant research due to poor stability.

Purpose of the Study:

  • To develop a novel microencapsulation strategy for lubricant additives.
  • To overcome the challenge of microcapsule shell breakage under severe shearing conditions.
  • To create a multifunctional additive with enhanced lubricity and tribological properties.

Main Methods:

  • Development of smart-responsive colloidal capsules with tailored shell properties.
  • Focus on shell-lubricant interaction and synergistic effects of incorporated materials.
  • Testing the additive's performance in conventional melt lubricants under hot metal working conditions.

Main Results:

  • Achieved a ~70% improvement in lubricity for conventional melt lubricants.
  • Demonstrated an unprecedented ~93% oxidation-reduction capability.
  • Reported the first instance of ultra-low friction (0.07) at 880 °C.

Conclusions:

  • The developed smart colloidal capsules offer a viable solution to microencapsulation limitations in tribology.
  • This approach enables the creation of multifunctional lubricant additives with superior performance.
  • Opens new possibilities for customizing additive packages in lubrication science through smart capsules.