Etiket Arşivleri: Differential Scanning Calorimetry

Thermogravimetric Analysis and Differential Scanning Calorimetry

Seminar on

“THERMOGRAVIMETRIC ANALYSIS AND DIFFERENTIAL SCANNING CALORIMETRY”

Thermal Analysis

Differential Scanning Calorimetry (DSC)
Measure heat absorbed or liberated during heating or cooling

Thermal Gravimetric Analysis (TGA)
Measure change in weight during heating or cooling

Differential Scanning Calorimetry (DSC)

Calorimeter-Heat flow in sample Differential calorimeter-heat flow in sample vs referance as function of time mJ/sec.

DSC: The Technique

Differential Scanning Calorimetry (DSC) measures the temperatures and heat flows associated with transitions in materials as a function of time and temperature in a controlled atmosphere.
• These measurements provide quantitative and qualitative information about physical and chemical changes that involve endothermicor exothermicprocesses, or changes in heat capacity.


Differential Scanning Calorimetry ( Stephen Collins )

Differential Scanning Calorimetry

Stephen Collins

Benefits

Increased Sensitivity for Detecting Weak (Glass) Transitions

Eliminates baseline curvature and drift

Increased Resolution Without Loss of Sensitivity

Two heating rates (average and instantaneous)

Ability to Separate Complex Thermal Events and Transitions Into Their Heat Capacity and Kinetic Components

Ability to Measure Heat Capacity (Structure) Changes During Reactions and Under Isothermal Conditions

Downside

Slow data collection