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Related Concept Videos

Van der Waals Equation01:10

Van der Waals Equation

4.4K
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...
4.4K
Van der Waals Interactions01:24

Van der Waals Interactions

65.1K
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.
65.1K
Third Law of Thermodynamics02:38

Third Law of Thermodynamics

19.4K
A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
19.4K
Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

3.0K
The second law of thermodynamics can be stated quantitatively using the concept of entropy. Entropy is the measure of disorder of the system.
The relation  between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
3.0K
Entropy02:39

Entropy

30.8K
Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
30.8K
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

2.7K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
2.7K

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Related Experiment Video

Updated: Aug 31, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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High Entropy van der Waals Materials.

Tianping Ying1,2, Tongxu Yu3, Yanpeng Qi4

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 25, 2022
PubMed
Summary
This summary is machine-generated.

High entropy van der Waals materials (HEX) combine high entropy alloys and van der Waals systems. This novel class offers a flexible platform for exploring unique physical properties and designing advanced catalysts.

Keywords:
2D materialshigh entropy materialssuperconductorsvan der Waals materials

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Last Updated: Aug 31, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • The high entropy concept expands alloy exploration beyond traditional strategies.
  • Van der Waals (vdW) systems offer unique properties through stacking and intercalation.
  • Integrating these concepts opens new avenues in materials discovery.

Purpose of the Study:

  • To introduce and review high entropy van der Waals materials (HEX).
  • To outline design strategies and current challenges for HEX.
  • To highlight the potential of HEX in fundamental science and applications.

Main Methods:

  • Integrating local features of high entropy materials (composition, spin, valence) with vdW system degrees of freedom (stacking, twisting, intercalation).
  • Application of design strategies to discover new HEX, including dichalcogenides, phosphorus tri-chalcogenides, halogens, and MXenes.
  • Utilizing the 2D lattice platform for studying correlations between material properties.

Main Results:

  • Successful discovery of diverse high entropy van der Waals materials.
  • Demonstration of a flexible platform for studying superconductivity, magnetism, and metal-insulator transitions.
  • Evidence of novel catalyst design through deliberate structural unit and stacking configuration.

Conclusions:

  • High entropy van der Waals materials represent a promising new frontier in materials science.
  • HEX offer tunable properties for fundamental research and advanced applications.
  • Further exploration is needed to fully realize the potential of these materials.