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Van der Waals Equation01:10

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
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Van der Waals Interactions01:24

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

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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.
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Line, Surface, and Volume Integrals01:15

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A line integral for a vector field is defined as the integral of the dot product of a vector function with an infinitesimal displacement vector along a prescribed path. If the prescribed path is closed, the integrals reduce to a closed-line integral. The closed-contour integral of the vector field is referred to in terms of the circulation of the vector field around the closed path. A vector with zero circulation around every closed path is called a conservative field, while one with non-zero...
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Valence Bond Theory and Hybridized Orbitals02:38

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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
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Coulomb's Law describes the force experienced by two point charges under each other's presence. But what if there are more than two charges? For example, if there is a third charge, does it experience a force that is a simple combination of the individual forces due to the first two charges? Can it be described mathematically?
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Video Experimental Relacionado

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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

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La integración de Van der Waals antes y después de los materiales bidimensionales

Yuan Liu1,2, Yu Huang3,4, Xiangfeng Duan5,6

  • 1Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA.

Nature
|March 22, 2019
PubMed
Resumen
Este resumen es generado por máquina.

La integración de Van der Waals ofrece un método flexible y libre de enlaces para combinar diversos materiales, superando las limitaciones del crecimiento epitaxial tradicional. Este enfoque permite la creación de nuevas heteroestructuras artificiales y superredes con propiedades únicas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Física de la materia condensada
  • Nanotecnología

Sus antecedentes:

  • La integración de materiales tradicionales, como el crecimiento epitaxial, se basa en fuertes enlaces químicos, lo que requiere una estricta compatibilidad estructural y de procesamiento.
  • Esto limita la combinación de materiales diferentes y restringe el desarrollo de heteroestructuras avanzadas.
  • Las heteroestructuras bidimensionales de van der Waals muestran el potencial de los métodos de integración alternativos.

Objetivo del estudio:

  • Revisar el desarrollo, los desafíos y las oportunidades de la integración de Van der Waals.
  • Generalizar este enfoque para diversos sistemas de materiales más allá de dos dimensiones.
  • Explorar su potencial para crear nuevas heteroestructuras artificiales y superredes.

Principales métodos:

  • Revisión de la literatura existente sobre la integración de Van der Waals.
  • Análisis de los principios y ventajas del montaje libre de enlaces.
  • Generalización del concepto a los sistemas tridimensionales y materiales complejos.

Principales resultados:

  • La integración de Van der Waals proporciona una estrategia versátil y libre de enlaces para ensamblar bloques de construcción de materiales prefabricados.
  • Evita las limitaciones de compatibilidad de celosía y procesamiento inherentes al crecimiento epitaxial.
  • El enfoque es aplicable a una amplia gama de materiales, incluidos los más allá de dos dimensiones.

Conclusiones:

  • La integración de Van der Waals representa un avance significativo en el ensamblaje de materiales, lo que permite la creación de heteroestructuras artificiales complejas.
  • Este método abre nuevas vías para el diseño de materiales con propiedades a medida para diversas aplicaciones.
  • La investigación adicional sobre los desafíos y las oportunidades impulsará el desarrollo de esta tecnología transformadora.