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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.7K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Thermal expansion and Thermal stress: Problem Solving01:27

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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?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Thermal Stress01:09

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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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A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles
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Organic Thermoelectric Multilayers with High Stretchiness.

Chungyeon Cho1, Jihun Son1

  • 1Department of Carbon Convergence Engineering, College of Engineering, Wonkwang University, Iksan 54538, Jeonbuk, Korea.

Nanomaterials (Basel, Switzerland)
|December 28, 2019
PubMed
Summary

Researchers developed a flexible organic thermoelectric material using polyethylene oxide (PEO) and double-walled carbon nanotubes (DWNT). This stretchable nanocomposite maintains performance under strain and bending, enabling wearable electronics.

Keywords:
carbon nanomaterialslayer-by-layer assemblyorganic multilayerspower factorstretchable thin filmsthermoelectric multilayers

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Electronics

Background:

  • Thermoelectric materials convert heat to electricity.
  • Developing flexible and stretchable thermoelectric devices is crucial for wearable applications.
  • Organic materials offer potential for low-cost, large-area fabrication.

Purpose of the Study:

  • To create a stretchable organic thermoelectric multilayer film.
  • To investigate the thermoelectric properties and mechanical stability of the developed material.
  • To explore its potential for wearable electronics and sensors.

Main Methods:

  • Layer-by-layer assembly of polyethylene oxide (PEO) and double-walled carbon nanotubes (DWNT) dispersed with polyacrylic acid (PAA).
  • Fabrication of a 25 bilayer thin film (~500 nm thick).
  • Testing of electrical conductivity, Seebeck coefficient, power factor, and mechanical strain/cycling durability.

Main Results:

  • Achieved a power factor of 7.1 µW/m·K² with conductivity of 19.6 S/cm and Seebeck coefficient of 60 µV/K.
  • The nanocomposite remained crack-free up to 30% strain.
  • Thermoelectric performance showed only a 10% decrease after stretching and remained stable after 1000 bending/twisting cycles.

Conclusions:

  • The PEO/DWNT-PAA nanocomposite demonstrates excellent stretchability and stable thermoelectric performance.
  • The combination of elastomeric properties and thermoelectric behavior is promising for flexible wearable devices.
  • This material opens possibilities for advanced wearable electronics and sensors requiring high mechanical compliance.