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> Central Laboratories > Laboratory of Thermal Analysis
Laboratory of Thermal
Analysis
Laboratory | Principles of methods | Instrumental equipment | Usage of TG, DTA and DSC applications
| Samples requirements | Contact
Laboratory
In Laboratory of Thermal Analysis is
carried on the thermal analysis of organic and inorganic samples using these
methods:
·
Thermogravimetric analysis (TGA)
·
Differential
thermal analysis (DTA)
·
Differential
scanning calorimetry (DSC)
Principles of methods
Thermogravimetric
analysis (TGA)
Method is based on the measurement
of the weight loss (resp. weight gain) of the material as a function of
temperature and time. Sample of analyzed substance is heated (constant heating
rate or in isothermal mode) during continuous weighting. Results are displayed
on thermogravimetric graph - thermogram.
Differential thermal
analysis (DTA)
Sample of analyzed substance and
reference sample (thermal stable sample) are heated by controlled heating rate.
Temperature difference between sample and reference is measured by
thermocouple. This difference describes heat affected and heat production
processes in time.
Differential scanning calorimetry (DSC)
Differential scanning calorimetry (DSC) is based on same principles as DTA.
Differences between sample temperature and reference temperature are measured
and convert by software to energy units. After mathematic conversion the value
is called Heat Flow.
Instrumental equipment
Simultaneous instrument for TG a DTA
Setsys Evolution (in the middle) designed
by Setaram. Maximum furnace temperature is
Differential scanning calorimetry carried on DSC 131 by Setaram
(right side in the picture). Operating temperature range:
Thermogravimetric Analyser – Pyris
1 TGA by Perkin ElmerTM
Instruments; maximum furnace temperature is
Thermobalance Stanton Redcroft TG 750 (Tmax
=
Heating rates: 1, 2, 3, 10, 15, 20,
30, 50,
Sample size: 0.1mg - 100mg
Balance ranges: 1 - 200mg
Atmosphere: flowing air or inert gas
Data collection and acquisition
additionally installed
Two devices for DTA (self-made in our laboratory) temperature operating range: 25 -
Usage of TG, DTA a DSC applications
·
Thermal
decomposition of inorganic and organic substances
·
Dehydratation of hydrates and minerals
·
Thermal
stability of materials
·
Pyrolysis of coal, petroleum and wood
·
Roasting
and calcining minerals
·
Determination
of moisture, volatiles and ash contents
·
Degradation
of polymeric materials
·
Corrosion
of metals
·
Solid-state
reaction
·
Evaporation
of liquids
·
Infrared
spectroscopy analysis of gaseous products (TGA-IR)
·
Mass
spectroscopy of gaseous products (TG+DTA-MS)
Samples requirements
·
Samples
should be prepared suitable for selected analyses – no any special
preparation of samples will take place in our laboratory
·
Samples
for analysis have to be in liquid or solid phase
·
Solid
samples – preferably in powder state or little pieces
·
Samples
amount: 1 mg – 100 mg - depends on technique type (consultation recommended)
Contact
Ing. (MSc) Anežka
Veselá
Head of laboratory
Phone: +420 220 443 839
E-mail: Anezka.Vesela
RNDr. (MSc) Jana Ederová,
CSc. (PhD)
Phone: +420 220 443 834
E-mail: Jana.Ederova
Ing. (MSc) Jiří
Endrýs, CSc. (PhD)
Phone: +420 220 443 258
E-mail: Jiri.Endrys
Michaela Tomková
Phone: +420 220 443 834
E-mail: Michaela.Tomkova
Ing. (MSc) Přemysl
Janík
Phone:+420 220 443 258
E-mail: Premysl.Janik
Location
ICT
Building B
Basement, door n. S28
Technická 3, 166 28 Praha 6
Czech Republic