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Related Concept Videos

Entropy02:39

Entropy

28.6K
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...
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Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

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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.
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Entropy and the Second Law of Thermodynamics01:20

Entropy and the Second Law of Thermodynamics

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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...
2.7K
Equilibrium Conditions for a Particle01:23

Equilibrium Conditions for a Particle

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When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
993
First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

6.8K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
6.8K
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

5.0K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
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Updated: May 25, 2025

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Entropy Production in a System of Janus Particles.

Andrés Arango-Restrepo1, Juan David Torrenegra-Rico1, J Miguel Rubi1

  • 1Condensed Matter Department, Universitat de Barcelona, 08028 Barcelona, Spain.

Entropy (Basel, Switzerland)
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

This study explores entropy production in active matter, revealing its role in individual particle behavior and collective phenomena. Understanding these thermodynamic principles aids in analyzing self-organization and non-equilibrium systems.

Keywords:
active particlesenergy dissipationentropy productionjanus particlesself-assembly

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Area of Science:

  • Thermodynamics
  • Active Matter Physics
  • Statistical Mechanics

Background:

  • Entropy production is crucial for understanding non-equilibrium systems.
  • Active matter exhibits complex behaviors like self-organization and clustering.
  • Catalytic Janus particles are model systems for active matter research.

Purpose of the Study:

  • To investigate the role of entropy production in individual active particles.
  • To analyze entropy production in systems of interacting active particles.
  • To bridge microscopic dynamics with macroscopic behavior using a thermodynamic perspective.

Main Methods:

  • Utilizing a multiscale framework to connect microscopic and macroscopic scales.
  • Analyzing entropy production in single catalytic Janus particles.
  • Examining entropy production in systems of interacting active particles and their environment.

Main Results:

  • Entropy production quantifies out-of-equilibrium behavior in active matter.
  • It influences transport coefficients and phoretic velocities.
  • It provides insights into collective phenomena like structural transitions and self-organization.

Conclusions:

  • Entropy production is a fundamental concept for active matter systems.
  • This research offers a thermodynamic perspective on active particle dynamics.
  • Findings open new avenues for non-equilibrium thermodynamics research.