Temperature-Modulated Differential Scanning Calorimeter
Dr. A.M. Awasthi

  • Sample Size: 0.5 to 100 mg (nominal).
  • Sample Volume: 10 mm3 in hermetic pans.
  • Atmosphere: non-corrosive inert, reducing or oxidizing.
  • Dynamic Gas Purge: up to 100 mL/min @ 2 Torr to atmospheric.
  • Temperature Range: generic (ambient to 600 C); quench-cooling (140K-500 C); programmed cooling (130K-500 C).
  • Prog. Heating Rate ( C/min): 0.01 to 200 (to 10 with modulation on).
  • Temperature Modulation Amplitude: 0.01 C to 10 C.
  • Temperature Modulation Period: 10 to 100 seconds.
  • Temperature Accuracy and Reproducivity:  1 C and  0.1 C.
  • Maximum Sensitivity: 1  W (2:1 S/N r.m.s.).
  • Calorimetric Precision:  1%.
UGC-DAE Consortium for Scientific Research
( An Autonomous Institute of University Grants Commission, New Delhi )

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Relevant Publications -

  • Interplay of superconductivity and charge density wave ordering in pseudoternary alloy compounds: Lu2Ir3(Si1-xGex)5, Lu2(Ir1-xRhx)3Si5, and (Lu1-xScx)2Ir3Si5, N.S. Sangeetha, A. Thamizhavel, C.V. Tomy, Saurabh Basu, A.M. Awasthi, S. Ramakrishnan, and D. Pal, Phys. Rev. B. 86, 024524 (2012).

  • Crystallization and glass transition kinetics in Cu+ ion substituted Cux-Ag1?xI-Ag2O-V2O5 superionic glasses, N. Gupta, A. Dalvi, S. Bhardwaj, A.M. Awasthi, J. Non-Cryst Solids 357, 1811 (2011).

  • Textural ordering in NiTi, NiFeTi, and NiMnGa shape memory alloys---kinetics of intra- and inter-domain processes, A.M. Awasthi, S. Bhardwaj, S. Banik, and S.R. Barman, Advanced Materials Research 52, 69 (2008).

  • Phase diagram and electronic structure of Ni2+xMn1?xGa, S. Banik, Aparna Chakrabarti, U. Kumar, P.K. Mukhopadhyay, A.M. Awasthi, R. Ranjan, J. Schneider, B.L. Ahuja, and S.R. Barman, Phys. Rev. B 74, 085110 (2006).

  • Calcium silicate based microspheres of repaglinide for gastroretentive floating drug delivery: Preparation and in-vitro characterization, S.K. Jain, A.M. Awasthi, N.K. Jain and G.P. Agrawal, Journal of Controlled Release 107(2), 300 (2005).

  • Effects of melt-aging on the density, elastic modulus and glass transition temperature of bismuth borate glasses, Atul Khanna, K.J.S. Sawhney, M.K. Tiwari, S. Bhardwaj, A.M. Awasthi, J. Phys: Cond. Matt 15, 6659 (2003).

  • Thermo-Kinetic Anomalies across Rigidity Threshold in GexSe1-x, A.M. Awasthi and S. Sampath, Materials Transactions 43(8), 2046 (2002).

Thermal analysis (TA) is used in Materials Science, Electronics, Polymers, Pharmaceuticals, Geology, and Quality Control. Often the information gained here is impossible to obtain by other analytical methods. TA comprises of a group of techniques monitoring a sample property vs. temp and/or time, temp being programmed. Differential Scanning Calorimeter (DSC) measures the heat flows associated with transitions/processes in materials as a function of time and temperature in a controlled atmosphere. The measurements provide both quantitative and qualitative information about physico-chemical changes that involve endo/exothermic processes, or changes in heat capacity. Additionally, the temperature-modulation enhancement provides separate signals for complex reversing (equilibrium) and kinetic (dissipative/relaxational) processes, and delineates close-by events, irresolvable by the traditional TA methods.DSC technique is used to characterize the following:
  • Glass Transition
  • Crystallization
  • Phase Transition
  • Specific Heat
  • Melting/Boiling
  • Reaction Kinetics
  • Heats of Fusion/Reactions
  • Thermal Stability
  • Percent Crystallinity
  • Rate/Degree of Cure
  • Purity