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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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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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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
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The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
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Understanding temperature-modulated calorimetry through studies of a model system.

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This study clarifies temperature-modulated calorimetry (TMC) by analyzing a model system. Findings reveal how TMC measures frequency-dependent heat capacity, entropy production, and aging effects in glassy materials.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Thermodynamics

Background:

  • Temperature modulated calorimetry (TMC) is a prevalent technique with unresolved fundamental questions.
  • Understanding the nuances of heat capacity and relaxation phenomena in complex systems remains a challenge.

Purpose of the Study:

  • To investigate temperature-modulated calorimetry at constant average temperature using a model system.
  • To precisely define frequency-dependent heat capacity and its link to entropy production.
  • To explore TMC's capability in observing sample aging and the Kovacs effect in out-of-equilibrium systems.

Main Methods:

  • Utilized a model system with a nontrivial spectrum of relaxation times.
  • Conducted temperature-modulated calorimetry experiments at constant average temperature.
  • Compared measurements from standard scanning calorimetry (SSC) and TMC.

Main Results:

  • Established the relationship between frequency-dependent heat capacity, entropy production, and aging in glassy samples.
  • Demonstrated TMC's ability to observe the Kovacs effect, a memory phenomenon in out-of-equilibrium systems.
  • Showcased the complementary nature of SSC and TMC, highlighting distinct features probed by each.

Conclusions:

  • TMC provides insights into energy transfer timescales and aging phenomena.
  • SSC and TMC are complementary techniques, with SSC detecting relaxations not captured by low-frequency TMC.
  • This research enhances the understanding and application of modulated calorimetry in materials science.