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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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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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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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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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Related Experiment Video

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Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus
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Micromachined Chip Scale Thermal Sensor for Thermal Imaging.

Gajendra S Shekhawat1, Srinivasan Ramachandran2, Hossein Jiryaei Sharahi3

  • 1Department of Material Science and Engineering and NUANCE Center, Northwestern University , Evanston, Illinois 60208, United States.

ACS Nano
|February 6, 2018
PubMed
Summary

A novel nanomechanical thermal sensor achieves 20 nm lateral resolution in scanning thermal microscopy (SThM), overcoming previous limitations for nanoscale thermal characterization at high temperatures.

Keywords:
STHmVertiSensemetallic nanostructuresnanomechanical thermal sensortemperature mappingthermal conductivity mappingthermal imaging

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Scanning thermal microscopy (SThM) traditionally suffers from limited lateral resolution due to thermal sensor performance.
  • Achieving high resolution is crucial for nanoscale thermal characterization across diverse applications.

Purpose of the Study:

  • To develop a nanomechanical system-based thermal sensor for enhanced SThM lateral resolution.
  • To enable high-temperature nanoscale thermal analysis with improved sensitivity and stability.

Main Methods:

  • Integration of a vertically oriented thermocouple sensor with a low thermal mass hollow silicon tip.
  • Utilizing a 50 nm diameter metallic nanowire at the probe apex for sample interaction.
  • Employing the developed probe for imaging nanostructures in various material systems.

Main Results:

  • Achieved excellent lateral resolution of approximately 20 nm.
  • Enabled high-temperature measurements exceeding 700 °C without cantilever bending.
  • Demonstrated high thermal sensitivity of around 0.04 °C.

Conclusions:

  • The novel thermocouple-based probe significantly enhances SThM lateral resolution and high-temperature capabilities.
  • The probe design offers a promising solution for advanced nanoscale thermal characterization.
  • Potential applications span the semiconductor industry, biomedical imaging, and data storage.