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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...
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Dry Friction01:30

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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Surface Membrane Barriers01:18

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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Colloids03:22

Colloids

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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Published on: December 24, 2014

Lubricación a presiones fisiológicas mediante cepillos polizwitteriónicos.

Meng Chen1, Wuge H Briscoe, Steven P Armes

  • 1Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford OX1 3QZ, UK.

Science (New York, N.Y.)
|March 28, 2009
PubMed
Resumen

Los investigadores desarrollaron cepillos polizwiteriónicos avanzados para la lubricación extrema en entornos acuosos. Estas superficies sintéticas logran una fricción ultra baja, imitando las articulaciones naturales y ofreciendo potencial para mejorar las articulaciones artificiales y las aplicaciones de maquinaria.

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Área de la Ciencia:

  • Biomimética y Ciencia de los Materiales.
  • Química de la superficie y tribología.

Sus antecedentes:

  • Las articulaciones sinoviales naturales exhiben coeficientes de fricción excepcionalmente bajos (μ < 0,002) incluso bajo altas presiones (> 5 MPa).
  • Replicar este nivel de lubricación en juntas artificiales y superficies de ingeniería dentro de ambientes acuosos sigue siendo un desafío significativo.
  • Las superficies sintéticas existentes no coinciden con el rendimiento tribológico de las articulaciones biológicas en el agua.

Objetivo del estudio:

  • Diseñar superficies sintéticas capaces de lograr una fricción ultra baja en entornos acuosos.
  • Investigar el potencial de los cepillos polizwiteriónicos para la lubricación biomimética.
  • Para explorar la relación entre la hidratación superficial y el rendimiento de lubricación.

Principales métodos:

  • La polimerización de cepillos polizwitteriónicos directamente de las superficies en medios acuosos.
  • Medición de los coeficientes de fricción (μ) bajo presiones variables (hasta 7,5 MPa).
  • Análisis de las propiedades de hidratación superficial atribuidas a los monómeros similares a la fosforilcolina.

Principales resultados:

  • Se han logrado coeficientes de fricción ultrabajos tan bajos como μ = 0.0004 a presiones de hasta 7,5 MPa.
  • Rendimiento de lubricación demostrado superior al de los sistemas acuosos sintéticos reportados anteriormente.
  • La lubricación extrema correlacionada con la fuerte hidratación proporcionada por la estructura de cepillo polizwitteriónica.

Conclusiones:

  • Los cepillos polizwitteriónicos polimerizados directamente de las superficies ofrecen una estrategia altamente efectiva para lograr una lubricación acuosa extrema.
  • La capa de hidratación robusta formada por estos cepillos es clave para su rendimiento tribológico superior.
  • Este avance tiene implicaciones significativas para el diseño de juntas artificiales avanzadas y la mejora de la lubricación en diversas tecnologías a base de agua.