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Constant Pressure Calorimetry03:02

Constant Pressure Calorimetry

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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...
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Calorimetry01:19

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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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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...
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Heat Flow and Specific Heat01:12

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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
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Updated: Nov 9, 2025

Thermal Measurement Techniques in Analytical Microfluidic Devices
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Fluid interface calorimetry.

Pablo F Garrido1, Margarida Bastos2, Adrián Velázquez-Campoy3

  • 1Departamento de Fisica de Aplicada, Facultade de Fisica, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain.

Journal of Colloid and Interface Science
|April 11, 2021
PubMed
Summary
This summary is machine-generated.

Isothermal titration calorimetry measures heat exchange during amphiphilic molecule adsorption to liquid-air interfaces. This method quantifies surface tension and adsorption kinetics for various molecules and biomacromolecules.

Keywords:
AdsorptionCalorimetryInterfacesIsothermal Titration CalorimetrySurface Tension

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Biophysical Chemistry

Background:

  • Amphiphilic molecules adsorb to polar-nonpolar interfaces.
  • Adsorption timescale depends on molecular properties.
  • This process involves detectable heat exchange.

Purpose of the Study:

  • To detect and quantify heat exchange during amphiphile adsorption to liquid-air interfaces.
  • To utilize isothermal titration calorimetry for studying adsorption kinetics.
  • To determine surface tension of various solutions.

Main Methods:

  • Injecting air into aqueous solutions within an isothermal titration calorimeter.
  • Observing adsorption of solute molecules to newly formed liquid/air interfaces.
  • Performing continuous and static bubble experiments to study adsorption processes.

Main Results:

  • Measured power associated with bubble formation, growth, and release.
  • Identified contributions from pressure changes, solvent evaporation-condensation, interfacial area increase, and heat capacity changes.
  • Determined surface tension of liquids and solutions using bubble injection patterns.

Conclusions:

  • Isothermal titration calorimetry can detect heat exchange during adsorption.
  • The method allows for the determination of surface tension.
  • This technique is applicable to various molecules and biomacromolecules.