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Related Concept Videos

Calorimetry01:19

Calorimetry

3.2K
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...
3.2K
Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

86.5K
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
86.5K
Constant Volume Calorimetry02:41

Constant Volume Calorimetry

27.7K
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
27.7K
Coulometry: Overview01:00

Coulometry: Overview

1.7K
Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
1.7K
Joule-Thomson Effect01:21

Joule-Thomson Effect

5.5K
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...
5.5K
Thermodynamic Potentials01:26

Thermodynamic Potentials

979
Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
979

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Updated: Sep 16, 2025

Thermal Measurement Techniques in Analytical Microfluidic Devices
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Coulomb blockade thermometry based nanocalorimetry.

Mari C Cole1, Maximilian T Pelly1, Craig V Topping1

  • 1SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom.

The Review of Scientific Instruments
|July 11, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a nanocalorimeter for measuring specific heat in microcrystals and thin films. This device combines sensitive calorimetry with accurate thermometry, enabling precise measurements in extreme conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Specific heat measurements provide critical insights into material entropy and excitation spectra.
  • Measuring microcrystals and thin films, especially at sub-Kelvin temperatures and high magnetic fields, presents significant challenges.

Purpose of the Study:

  • To develop a novel nanocalorimeter capable of precise specific heat measurements on microscale samples.
  • To overcome the limitations of existing techniques in extreme thermodynamic regimes.

Main Methods:

  • Integration of highly sensitive SiNx membrane-based calorimetry with absolute accuracy Coulomb blockade thermometry.
  • Utilizing Coulomb blockade thermometry as an on-platform, magnetic field-independent thermometer with both primary and secondary modes.

Main Results:

  • Demonstrated a nanocalorimeter with a resolution of 0.1 nJ K-1 at 500 mK for a 20 μg Sr3Ru2O7 sample.
  • Achieved absolute accuracy limited primarily by sample mass determination.
  • Successfully applied the device to measure microcrystals of CeRh2As2, showcasing its utility.

Conclusions:

  • The developed nanocalorimeter effectively measures specific heat in microcrystals and thin films under challenging conditions.
  • This technique enhances the study of thermodynamic properties in novel materials at the nanoscale.