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Related Concept Videos

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Performance of Thermal Interface Materials.

D D L Chung1

  • 1Composite Materials Research Laboratory, Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|March 10, 2022
PubMed
Summary
This summary is machine-generated.

Thermal interface materials (TIMs) improve thermal contacts, with performance measured by thermal contact conductance, not just material conductivity. Thermal pastes and low-melting alloys show the best TIM performance.

Keywords:
thermal conductancethermal contactsthermal interface materialsthermal pastesthermal resistancethermal resistivity

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Area of Science:

  • Materials Science
  • Thermal Engineering

Background:

  • Thermal interface materials (TIMs) are crucial for enhancing thermal contact efficiency.
  • Evaluating TIM performance traditionally focuses on bulk thermal conductivity, often overlooking critical contact interface phenomena.

Purpose of the Study:

  • To analyze the performance of thermal interface materials (TIMs).
  • To define performance criteria and evaluation methods for TIMs.
  • To explore material development approaches for superior TIMs.

Main Methods:

  • Performance analysis centered on thermal contact conductance.
  • Evaluation of TIM properties including conformability, thermal conductivity, and thin-film feasibility.
  • Review of existing literature on TIM performance metrics.

Main Results:

  • Thermal contact conductance is the primary performance indicator, influenced by conformability, thermal conductivity, and thin-film capability.
  • Most research incorrectly focuses on TIM thermal conductivity rather than contact conductance.
  • Thermal pastes and low-melting alloys demonstrate the highest performance.

Conclusions:

  • Accurate TIM performance assessment requires prioritizing thermal contact conductance.
  • Future TIM development should focus on materials optimizing interface conductance.
  • Thermal pastes and low-melting alloys represent the current state-of-the-art in TIM performance.