digplanet beta 1: Athena
Share digplanet:

Agriculture

Applied sciences

Arts

Belief

Business

Chronology

Culture

Education

Environment

Geography

Health

History

Humanities

Language

Law

Life

Mathematics

Nature

People

Politics

Science

Society

Technology

Differential Thermal Analysis
Acronym DTA
Classification Thermal analysis
Other techniques
Related Differential scanning calorimetry
Isothermal microcalorimetry
Dynamic mechanical analysis
Thermomechanical analysis
Thermogravimetric analysis
Dielectric thermal analysis

Differential thermal analysis (or DTA) is a thermoanalytic technique, similar to differential scanning calorimetry. In DTA, the material under study and an inert reference are made to undergo identical thermal cycles, while recording any temperature difference between sample and reference.[1] This differential temperature is then plotted against time, or against temperature (DTA curve, or thermogram). Changes in the sample, either exothermic or endothermic, can be detected relative to the inert reference. Thus, a DTA curve provides data on the transformations that have occurred, such as glass transitions, crystallization, melting and sublimation. The area under a DTA peak is the enthalpy change and is not affected by the heat capacity of the sample.

Apparatus[edit]

A DTA consists of a sample holder comprising thermocouples, sample containers and a ceramic or metallic block; a furnace; a temperature programmer; and a recording system. The key feature is the existence of two thermocouples connected to a voltmeter. One thermocouple is placed in an inert material such as Al2O3, while the other is placed in a sample of the material under study. As the temperature is increased, there will be a brief deflection of the voltmeter if the sample is undergoing a phase transition. This occurs because the input of heat will raise the temperature of the inert substance, but be incorporated as latent heat in the material changing phase.[2]

Today's Instruments[edit]

In today’s market most manufactures no longer make a true DTA but rather have incorporated this technology into a Thermogravimetric analysis (TGA), which provides both mass loss and thermal information. With today’s advancements in software, even these instruments are being replaced by true TGA-DSC instruments that can provide the temperature and heat flow of the sample, simultaneously with mass loss.

Applications[edit]

A DTA curve can be used only as a finger print for identification purposes but usually the applications of this method are the determination of phase diagrams, heat change measurements and decomposition in various atmospheres.

DTA is widely used in the pharmaceutical[3] and food industries.[4][5][6][7]

DTA may be used in cement chemistry,[8] mineralogical research[9] and in environmental studies.[10]

DTA curves may also be used to date bone remains[11] or to study archaeological materials.[12][13]

References[edit]

  1. ^ Bhadeshia H.K.D.H. “Thermal analyses techniques. Differential thermal analysis”. University of Cambridge, Material Science and Metallurgy. www.msm.cam.ac.uk/phase-trans/2002/Thermal1.pdf
  2. ^ Robert Bud, Deborah Jean Warner. Instruments of Science. pp. 170–171. 
  3. ^ Ferrer S., Borrás J., Martín Gil J. and Martín Gil F.J. "Thermal studies on sulphonamide derivative complexes”. Thermochim. Acta, 1989, 147, 321 330; 1989, 153, 205 220; 1991, 185, 315 333.
  4. ^ Berger K.G., Akehurst E.E. “Some applications of differential thermal analysis to oils and fats”. International Journal of Food Science & Technology, 1966, 1, 237–247.
  5. ^ Ramos Sánchez M.C., Rey F.J., Rodríguez M.L., Martín Gil F.J. and Martín Gil J. "DTG and DTA studies on typical sugars". Thermochim. Acta, 1988, 134, 55 60.
  6. ^ F.J. Rey, M.C. Ramos-Sánchez, M.L.Rodríguez, J. Martín-Gil, F.J. Martín-Gil. "DTG and DTA studies on sugar derivatives". Thermochim. Acta, 1988, 134, 67 72.
  7. ^ Rodríguez Méndez M.L., Rey F.J., Martín Gil J. and Martín Gil F.J. "DTG and DTA studies on amino acids". Thermochim. Acta, 1988, 134, 73 78.
  8. ^ Ramachandran V.S. “Applications of differential thermal analysis in cement chemistry”. Chap. V, Chemical Publishing Co., Inc., New York (1969), 92.
  9. ^ Smykatz-Kloss W. “Application of differential thermal analysis in mineralogy”. J. Therm. Anal. Cal., 1982, 23, 15-44.
  10. ^ Smykatz-Kloss W., Heil A, Kaeding L. and Roller E. “Thermal analysis in environmental studies”. In: Thermal analysis in Geosciences. Springer Berlin / Heidelberg, 1991.
  11. ^ Villanueva, PrE, Girela F. y Castellanos M. “The application of differential thermal analysis and thermogravimetric analysis to dating bone remains”. Journal of Forensic Sciences, 1976, 21,
  12. ^ Misiego-Tejeda J.C., Marcos-Contreras G.J., Sarabia Herrero F.J., Martín Gil J. and Martín Gil F.J. "Un horno doméstico de la primera Edad del Hierro de "El Soto de Medinilla" (Valladolid) y su análisis por ATD". BSAA (University of Valladolid) 1993, LIX, 89 111.
  13. ^ Kingery W.D. “A note on the differential thermal analysis of archaeological ceramics”. Archaeometry, 1974, 16, 109–112.

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Differential_thermal_analysis — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
35130 videos foundNext > 

Differential Thermal Analysis. Homemade Setup

(Adolf Cortel, July 2012),. A sample and and inert reference (alumina) are heated and the difference in temperature is recorded against the temperature of th...

Thermal Analysis with Differential Scanning Calorimetry product range from PerkinElmer.

At PerkinElmer, we're committed to the future of thermal analysis. Our new line of high-performance DSC solutions, enables you to see more than you ever thou...

3-D Printing Differential Thermal Analysis Enclosures

NPHS Engineering Research students design and 3-D print enclosures for their Differential Thermal Analysis (DTA) device they are constructing. These enclosur...

Polymer Thermal Analysis Part 1

Polymer Thermal Analysis Jennifer E. Brooks, Ph.D. SPE e-Live Presentation August 14, 2008 Part 1: http://www.youtube.com/watch?v=he9gNt8q9Ls Part 2: http://...

Tutorial 03: Differential Casing Thermal Analysis

This is the third tutorial of the 'Getting started' tutorial series of the SimScale platform (www.simscale.com). It shows how to run a thermal analysis of a ...

Lecture 19 (2013). 8.4 General thermal analysis of Chapter 8 on internal convection

Lecture 19 (2013) 8.4 General thermal analysis of Chapter 8 on internal convection. Material: Chapter 8 of Cengel and Ghajar. Lectured by Prof Josua Meyer, D...

DSC Thermal Analysis of Polymers and Plastics Intertek

Thermal properties testing of plastics and polymers from Intertek laboratories, using Differential Scanning Calorimetry, DSC.

Lecture 20 (2013). General thermal analysis. Internal forced convection (continue)

Lecture 20 (2013). General thermal analysis. Internal forced convection (continue). Lecure based on Chapter 8 of Cengel and Ghajar (4th edition). Lecture by ...

Thermal Analysis Capabilities of Isola's Analytical Services Lab

Isola's Global Analytical Services Laboratory is home to the largest collection of Thermal Analysis equipment in North America. DSC, TGA, TMA and DMA instrum...

DSC Thermal Analysis of Pharmaceuticals

PerkinElmer has a complete portfolio of analytical instruments for the pharmaceutical laboratory. Get a sneak peak at our new line of DSC instruments and how...

35130 videos foundNext > 

31 news items

 
separationsNOW.com
Mon, 05 Jan 2015 06:48:45 -0800

Viton A/calcium disilicide mixtures were made and the thermal decomposition characteristics studied using thermal gravimetric/differential thermal analysis (TG/DTA). The activation energy ranged from 145–190 kJ mol−1, indicative of C [BOND] F scission ...
 
Azom.com
Wed, 23 Jul 2014 02:17:00 -0700

NETZSCH's STA 449 F5 Jupiter is a top-loading system designed for thermogravimetry and differential thermal analysis. The system ensures easy operation and sample change can be carried out using the motorized furnace hoist and top-loading principle of ...
 
PR Web (press release)
Thu, 07 Aug 2014 11:56:15 -0700

Thermogravimetric analysis coupled with differential thermal analysis, or TGA/DTA, is effective for measuring degradation rates, moisture and volatile organic compound content, thermal stability and other characteristics of polymeric materials. Since ...

Azom.com

Azom.com
Wed, 05 Nov 2014 03:43:16 -0800

Traditional thermal analysis techniques such as differential scanning calorimetry (DSC), differential thermal analysis (DTA), differential scanning calorimetry (DSC) and thermogravi-metric analysis (TGA) cannot offer full information about the ...

SPIE Newsroom

SPIE Newsroom
Tue, 06 May 2014 10:03:45 -0700

These images indicate that our microbolometer system can be used successfully to perform quantification of microscale thermal images (e.g., visual differential thermal analysis). Figure 4(b) shows the pseudo-accelerated frame rate that was applied to ...
 
Azom.com
Tue, 12 Nov 2013 09:00:54 -0800

The innovative DSC 214 Polyma is robust, easy to use and precise. The novel design of the instrument includes everything required for successful DSC investigations, regardless of whether the user is a beginner or an experienced professional. The two ...
 
Azom.com
Tue, 10 Sep 2013 03:51:37 -0700

The Light Flash Apparatus, LFA 467 HyperFlash, has a very broad range - with a single instrument setup, without swapping either the furnace or the detector, the LFA 467 HyperFlash can carry out measurements from -100°C to 500°C. Combined with an ...
 
Azom.com
Wed, 04 May 2011 00:52:15 -0700

GC is a high-resolution method for separating volatile and semi-volatile compounds. The gas mixtures are separated based on the differences in component distribution between a stationary phase (e.g. inner coating of a capillary) and a mobile phase ...
Loading

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight