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Related Concept Videos

Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...
Le Chatelier's Principle: Changing Temperature02:19

Le Chatelier's Principle: Changing Temperature

Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
To understand this phenomenon, consider the elementary reaction:
Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

The Arrhenius equation,
Joule-Thomson Effect01:21

Joule-Thomson Effect

The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...

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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

Published on: April 16, 2017

Achieving a strongly temperature-dependent Casimir effect.

Alejandro W Rodriguez1, David Woolf, Alexander P McCauley

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We present a novel method to measure temperature sensitivity in the Casimir force using dielectric objects in fluid. This technique reveals significant variations in object separation with temperature changes.

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Last Updated: Jun 8, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Published on: April 16, 2017

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Area of Science:

  • Physics
  • Materials Science
  • Physical Chemistry

Background:

  • The Casimir force, a quantum electrodynamic phenomenon, influences nanoscale interactions.
  • Understanding temperature effects on forces is crucial for micro/nanotechnology.
  • Current methods lack sufficient temperature sensitivity for practical applications.

Purpose of the Study:

  • To develop and validate a method for achieving high temperature sensitivity in Casimir force measurements.
  • To explore the temperature-dependent stable separation of dielectric objects in fluid.
  • To investigate the impact of Brownian motion and phase transitions on Casimir force measurements.

Main Methods:

  • Simulating Casimir forces between dielectric slabs and spheres using realistic material models.
  • Analyzing the stable separation distances of objects immersed in a fluid across a range of temperatures.
  • Incorporating Brownian motion effects into the analysis of object separation.
  • Investigating temperature-induced transitions from suspension to stiction.

Main Results:

  • Demonstrated large variations (>2 nm/K) in stable separations (hundreds of nanometers) near room temperature.
  • Showed that the average separation is sensitive to temperature changes due to Brownian motion.
  • Observed irreversible transitions between suspension and stiction as temperature is varied.

Conclusions:

  • The proposed method offers a highly sensitive approach to measuring temperature effects on the Casimir force.
  • This technique has potential applications in micro/nanoscale devices and sensors.
  • The observed phenomena provide new insights into nanoscale interactions under varying thermal conditions.