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Videos de Conceptos Relacionados

Density00:56

Density

Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
Pressure of Fluids01:14

Pressure of Fluids

There are many examples of pressure in fluids in everyday life, such as in relation to blood (high or low blood pressure) and in relation to weather (high- and low-pressure weather systems). A given force can have a significantly different effect, depending on the area over which the force is exerted. For instance, a force applied to an area of 1 mm2 has a pressure that is 100 times greater than the same force applied to an area of 1 cm2. That's why a sharp needle is able to poke through skin...
Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the streamlines...
Characteristics of Fluids01:20

Characteristics of Fluids

When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
Characteristics of Fluids01:31

Characteristics of Fluids

Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Irrotational Flow01:28

Irrotational Flow

Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:

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Fluctuaciones de densidad bajo confinamiento: ¿cuándo un fluido no es un fluido?

M Heuberger1, M Zäch, N D Spencer

  • 1Laboratory for Surface Science and Technology, ETH Zentrum, CH-8092 Zürich, Switzerland. heuberger@surface.mat.ethz.ch

Science (New York, N.Y.)
|May 8, 2001
PubMed
Resumen

Las transiciones de ciclohexano confinado de un fluido 3D a un adsorbato 2D en volúmenes de attolitros. Este estudio revela propiedades distintas y fluctuaciones de densidad inesperadas en fluidos confinados.

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Área de la Ciencia:

  • Química Física es la química física.
  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Comprender el comportamiento de los fluidos en pequeños volúmenes es crucial para diversos campos científicos.
  • El confinamiento altera el comportamiento de la fase fluida y revela efectos de volumen excluido.
  • Estudios previos indicaron fuerzas estructurales y solidificación potencial en fluidos confinados.

Objetivo del estudio:

  • Para investigar el comportamiento de las películas delgadas de ciclohexano confinadas en volúmenes de attolitros.
  • Para medir simultáneamente el grosor de la película y el índice de refracción bajo confinamiento.
  • Para explorar la transición del fluido a granel al comportamiento del adsorbado 2D.

Principales métodos:

  • Utilizó un aparato de fuerzas superficiales extendidas con correlación espectral rápida.
  • Se realizaron mediciones simultáneas del grosor de la película y el índice de refracción.
  • Ciclohexano estudiado confinado dentro de volúmenes de attolitros.

Principales resultados:

  • Se observó una transición drástica de ciclohexano de un fluido a granel 3D a un adsorbato 2D a medida que disminuía el ancho de los poros.
  • Caracterizó las propiedades sorprendentemente diferentes del adsorbato 2D.
  • Se detectaron fluctuaciones de densidad de largo alcance de magnitud inesperada.

Conclusiones:

  • El ciclohexano exhibe un comportamiento único cuando se limita a volúmenes de attolitros, haciendo la transición a un adsorbado 2D.
  • El estudio proporciona nuevos conocimientos sobre el comportamiento de los fluidos a nanoescala.
  • Las inesperadas fluctuaciones de densidad ponen de relieve la complejidad de los sistemas confinados.