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Videos de Conceptos Relacionados

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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Colloids and Suspensions01:17

Colloids and Suspensions

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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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Types of Fluids01:27

Types of Fluids

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
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Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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La propagación de nanofluidos en los sólidos.

Darsh T Wasan1, Alex D Nikolov

  • 1Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA. wasan@iit.edu

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Los nanofluidos exhiben comportamientos únicos de propagación debido al ordenamiento de partículas en las líneas de contacto. Este descubrimiento revela un nuevo mecanismo para mejorar la recuperación de petróleo y la eliminación efectiva de suelos aceitosos.

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Área de la Ciencia:

  • Ciencias coloidales y de la superficie.
  • Ciencia de los materiales Ciencia de los materiales.
  • Ingeniería Ambiental Ingeniería Ambiental.

Sus antecedentes:

  • Los nanofluidos, suspensiones de partículas a nanoescala, tienen diversas aplicaciones, pero su propagación y adhesión difieren de los líquidos simples.
  • Las teorías existentes sugieren que el ordenamiento de las partículas en los nanofluidos influye en su comportamiento macroscópico.
  • Comprender estos fenómenos es crucial para aplicaciones como la remediación de suelos y la recuperación de petróleo.

Objetivo del estudio:

  • Para investigar la dinámica de propagación y el ordenamiento de partículas en nanofluidos en la región de contacto de tres fases.
  • Explorar el potencial del comportamiento de los nanofluidos para aplicaciones prácticas como la eliminación de suelos aceitosos.

Principales métodos:

  • Se utilizó la video microscopía para observar el comportamiento de las esferas de poliestireno cargadas de tamaño nanométrico en el agua.
  • Analizó el ordenamiento bidimensional en forma de cristal de las partículas en el borde del fluido.

Principales resultados:

  • Se ha demostrado la ordenación bidimensional en forma de cristal de las esferas de poliestireno en el agua en la región de contacto trifásica.
  • Se observó una dinámica de propagación mejorada en los fluidos micelares, que se correlaciona con el ordenamiento de las partículas.
  • Identificó un nuevo mecanismo para la detergencia en la eliminación de suelos aceitosos.

Conclusiones:

  • El ordenamiento coloidal en nanofluidos mejora significativamente la dinámica de propagación.
  • Esta extensión mejorada proporciona un nuevo mecanismo para la eliminación efectiva de suelos aceitosos y la mejora de la recuperación de petróleo.
  • Los hallazgos desafían los modelos tradicionales de propagación de líquidos y ofrecen nuevas vías para la ciencia de los materiales y las aplicaciones ambientales.