Thermal Analysis

Faculty member in charge: Praveen Ramamurthy

For usage contact: P. Padaikathan

Online booking system

1. The METTLER-TOLEDO Differential Scanning Calorimeter (DSC 822 e ) with S TA R e software measures the difference between the heat flows from the sample and reference sides of a sensor as a function of temperature or time. Differences in heat flow arise when a sample absorbs or releases heat due to thermal effects such as melting, crystallization, chemical reactions, polymorphic transitions… …

Specifications:

  • Sample mass/volume: minimum of 0.5 -20mg/up to 150ul
  • Temp range: Between -150°C and +700 o C
  • Cooling option: Liquid Nitrogen (pressurized to 20-30psi)
  • Heating rate: 2 – 50 K/min
  • Cooling rate: from 500 o C to 100 o C in 8min
  • Resolution: 0.4µW

Soon DSC will be upgraded with…..

Temperature-modulated DSC techniques (TMDSC) are widely used in thermal analysis to separate overlapping temperature-dependent and time-dependent thermal effects. Methods used up until now have overlaid the isothermal temperature or heating ramp with a (usually) sinusoidal temperature modulation of just one frequency (single frequency method).

Auto–Sampler Robot (for 32 No. of tests) and a LN 2 – Dewar capacity 240litre

Independent users (Mettler DSC):

  • Suresh(Satyam Suwas) (authorised to train others)
  • Soumitra Roy(Aloke Paul)
  • Eswar Prasad(U. Ramamurty)
  • Kiritiman(K.Chattopadhyay)
  • Ranjit(Praveen Ramamurthy)

 

 2. The NETZSCH STA 409 runs under PROTEUS Software for simultaneous TG-DSC or simultaneous TG-DTA measurements. The TG sample carriers exchanged with TG-DSC or TG-DTA modes operation with top-loaded samples ensure total protection of the balance, which is on the bottom and through accurate flow of the purge and protective gases

Specifications:

  • Temperature range: 25°C to 1600°C (SiC: HEATING ELEMENT)
  • Heating and cooling rates: 5 K/min to 50 K/min
  • Weighing range: 200 mg

TG resolution: up to 0.002mg

DSC resolution < 1 µW

Atmospheres: inert, oxidizing, reducing, static, dynamic

TG features:

  • Mass changes in wt% or mg
  • Automatic evaluation of mass-change steps
  • Calculation of mass/temperature values
  • Calculation of residual mass
  • Extrapolated onset and end temperatures
  • Peak temperatures of the 1st and 2nd derivative of the mass-change curve
  • Automatic baseline

DSC/DTA features:

  • Determination of onset, peak, inflection and end temperatures
  • Automatic peak search
  • Analysis of peak areas (enthalpies) with selectable baseline
  • Enthalpy determination allowing for mass changes
  • Comprehensive analysis of glass transitions

Independent users (NETZSCH TG/DTA):

  • Prasath Babu( S. Karthikeyan )(authorised to train others)
  • Soma prasad (Aloke Paul)
  • Anindya Roy(Vikram Jayaram)