Video Experimental Relacionado
Updated: Jul 13, 2026
12:59
A System to Create Stable Nanoparticle Aerosols from Nanopowders
Published on: July 26, 2016
Efectos de las moléculas de gas en los comportamientos nanofluídicos
1Department of Structural Engineering, University of California at San Diego, La Jolla, California 92093-0085, USA.
Journal of the American Chemical Society
|February 7, 2007
Resumen
Las interacciones gas-líquido son cruciales en los nanocanales. La disolución del gas causa no flujo de salida en los canales grandes, mientras que el agrupamiento de gas conduce a la defiltración en los canales pequeños, lo que afecta el transporte nanofluídico.
Área de la Ciencia:
- Los nanofluidos son nanofluidos.
- Dinámica Molecular Simulación de la dinámica molecular
- Interacciones gas-líquido Interacciones gas-líquido
Sus antecedentes:
- Los estudios nanofluídicos anteriores se centraron principalmente en las interacciones líquido-sólido.
- El papel significativo de la fase gaseosa en los nanoambientes fue en gran medida pasado por alto.
Objetivo del estudio:
- Para investigar la influencia de las interacciones gas-líquido en los fenómenos nanofluidos.
- Para dilucidar los mecanismos que rigen el comportamiento de los fluidos en los nanocanales bajo diferentes condiciones.
Principales métodos:
- Utilizando simulaciones de dinámica molecular para modelar el comportamiento de los fluidos a nanoescala.
- Analizar el comportamiento de las moléculas de gas (disolución y agrupación) dentro de nanocanales de diferentes tamaños.
Principales resultados:
- Las moléculas de gas se disuelven en líquido dentro de grandes nanocanales durante la infiltración inducida por presión, causando "no flujo de salida".
- Las moléculas de gas forman grupos en pequeños nanocanales, lo que desencadena la desfiltración del líquido a presión reducida.
- Los resultados de la simulación se alinean con las observaciones experimentales de experimentos de reposo a alta presión en geles de sílice nanoporosos.
Conclusiones:
- Las interacciones gas-líquido son indispensables en los nanoambientes e influyen significativamente en el transporte nanofluídico.
- El tamaño de los nanocanales dicta si predomina la disolución o agrupación de gases, lo que lleva a comportamientos fluidos distintos.
- Este estudio destaca la importancia de considerar la fase gaseosa en la comprensión de los fenómenos nanofluidos.
Videos de Conceptos Relacionados
03:48Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
04:01Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
01:17Viscosity
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
The SI unit of viscosity is...
01:21Molecular Kinetic Energy
The word "gas" comes from the Flemish word meaning "chaos," first used to describe vapors by the chemist J. B. van Helmont. Consider a container filled with gas, with a continuous and random motion of molecules. During collisions, the velocity component parallel to the wall is unchanged, and the component perpendicular to the wall reverses direction but does not change in magnitude. If the molecule’s velocity changes in the x-direction, then its momentum is changed. During the short time of the...
01:27Distribution of Molecular Speeds
The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
01:24The Kinetic Model of Gases
The kinetic model of gases explains the properties of a perfect gas using three main assumptions: molecules move in ceaseless random motion, their size is negligible compared to the distances between them, and they do not interact except during perfectly elastic collisions. The total energy of a gas is the sum of the kinetic energies of all its constituent molecules. The pressure exerted by the gas arises from the continual bombardment of the container walls by billions of colliding molecules.