Using Differential Scanning Calorimetry to Measure Changes in Enthalpy

Panoramica

Source: Laboratory of Dr. Terry Tritt — Clemson University

Differential Scanning Calorimetry (DSC) is a method of thermodynamic analysis based on heat-flux method, wherein a sample material (enclosed in a pan) and an empty reference pan are subjected to identical temperature conditions. The energy difference that is required to maintain both the pans at the same temperature, owing to the difference in the heat capacities of the sample and the reference pan, is recorded as a function of temperature. This energy released or absorbed is a measure of the enthalpy change (ΔΗ) of the sample with respect to the reference pan.

Procedura

1. Baseline Measurement

  1. Controller, Measuring unit, Computer system, Thermostat approximately 60 min. before starting the measurement. Purge gases must be connected to the system.
  2. Place two empty crucibles (with lid) into the sample carrier. The crucible material may be chosen based on the temperature range to be measured.
  3. Move the furnace to measuring position.
  4. Adjust the measuring conditions (gas, vacuum).
  5. Start the measurement program.
  6. Proceed to create a b

Log in or to access full content. Learn more about your institution’s access to JoVE content here

Risultati

ZnO formation via Decomposition of ZnCO3

The change in enthalpy per degree, at constant pressure is equivalent to the heat capacity of a material at constant pressure given by Equation 1. The enthalpy change is obtained by estimating the area under the curve between two temperature limits given by Equation 2.

(Equation 1)

Log in or to access full content. Learn more about your institution’s access to JoVE content here

Riferimenti
  1. Robinson, J.W., Skelly Frame, E.M., Frame, GM. Undergraduate Instrumental Analysis. Marcel Decker, New York, NY. (2005).
  2. Liu, S., Li, C., Yu, J., Xiang, Q., Improved visible-light photocatalytic activity or porous carbon self-doped ZnO nanosheet-assembled flowers. CrystEngComm. 13, p 2533 (2011).
  3. Gill, P., Tohidu Moghadam, T., Ranjbar, B.  Differential Scanning Calorimetry Techniques: Applications in Biology and Nanoscience. Biomolecular Techniques. 21, 167-193 (2010).
Tags
Differential Scanning CalorimetryEnthalpyEnergy ChangesChemical ReactionsThermodynamicsConstant PressureExothermic ReactionsEndothermic ReactionsSafetyEfficiencyExperimentHeat FlowOxide DecompositionCarbonate Decomposition

Vai a...

0:00

Overview

1:23

Principles of Enthalpy

3:48

DSC Baseline Measurement

5:04

DSC Reference Measurement

6:22

Sample Measurement

7:10

Analysis of the DSC Data

8:42

Applications

10:56

Summary

Video da questa raccolta:

article

Now Playing

Using Differential Scanning Calorimetry to Measure Changes in Enthalpy

General Chemistry

44.3K Visualizzazioni

article

Vetreria di laboratorio e relativi usi

General Chemistry

651.1K Visualizzazioni

article

Soluzioni e concentrazioni

General Chemistry

271.7K Visualizzazioni

article

Determinazione della densità di un solido e di un liquido

General Chemistry

553.0K Visualizzazioni

article

Determinazione della composizione percentuale di massa in una soluzione acquosa

General Chemistry

382.7K Visualizzazioni

article

Determinazione della formula empirica (minima)

General Chemistry

178.1K Visualizzazioni

article

Determinazione delle regole di solubilità di composti ionici

General Chemistry

140.8K Visualizzazioni

article

Uso del pH-metro

General Chemistry

343.3K Visualizzazioni

article

Introduzione alla titolazione

General Chemistry

422.0K Visualizzazioni

article

Legge dei gas perfetti

General Chemistry

77.5K Visualizzazioni

article

Determinazione spettrofotometrica di una costante di equilibrio

General Chemistry

158.0K Visualizzazioni

article

Principio di Le Châtelier

General Chemistry

262.9K Visualizzazioni

article

Depressione del punto di congelamento per l'identificazione di un composto sconosciuto

General Chemistry

159.4K Visualizzazioni

article

Determinazione dell'equazione cinetica e dell'ordine di reazione

General Chemistry

195.4K Visualizzazioni

article

Complessi chimici di coordinazione

General Chemistry

90.6K Visualizzazioni

JoVE Logo

Riservatezza

Condizioni di utilizzo

Politiche

Ricerca

Didattica

CHI SIAMO

Copyright © 2025 MyJoVE Corporation. Tutti i diritti riservati