Introducing Students to Thermogravimetry Coupled with Fourier Transform Infrared Spectroscopy

Introducing Students to Thermogravimetry Coupled with Fourier Transform Infrared Spectroscopy

Thermogravimetry coupled with Fourier transform infrared spectroscopy (TG-FTIR) is a useful technique for the thermal and structural characterization of materials at academic and research levels. This paper describes an experiment for chemistry students to understand the use of TG-FTIR for advanced...

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Bibliographic Details
Published in:Journal of chemical education Vol. 95; no. 8; pp. 1365 - 1370
Main Authors: Fernández Rojas, Marisol, Giorgi Pérez, Angélica M, Agudelo Hernández, María F, Carreño Díaz, Luz A
Format: Journal Article
Language:English
Published: Easton American Chemical Society and Division of Chemical Education, Inc 14-08-2018
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society
American Chemical Society
Subjects:
Analytical chemistry
Cellulose
Cellulose fibers
Chemistry
College Science
Fourier transforms
Gases
Hands on Science
Heat
Infrared analysis
Infrared spectra
Infrared spectroscopy
Instrumentation
Laboratory Experiments
Literary Devices
Monoethanolamine (MEA)
Organic chemistry
Qualitative analysis
Science Experiments
Science Instruction
Science Laboratories
Sodium
Sodium hydroxide
Spectroscopy
Spectrum analysis
Structural analysis
Students
Thermal analysis
Thermal cycling
Thermodynamic properties
Thermodynamics
Thermogravimetric analysis
Thermogravimetry
Undergraduate Study
Hands-On Learning/Manipulatives
Upper-Division Undergraduate
Analytical Chemistry
Laboratory Instruction
IR Spectroscopy
Thermal Analysis
Fourier Transform Techniques
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Summary:Thermogravimetry coupled with Fourier transform infrared spectroscopy (TG-FTIR) is a useful technique for the thermal and structural characterization of materials at academic and research levels. This paper describes an experiment for chemistry students to understand the use of TG-FTIR for advanced qualitative and quantitative thermal analysis using a natural compound as a sample. In the classroom, students learned about the fundamental principle of thermal analysis, TG-FTIR instrumentation, and different applications of this coupled technique for materials characterization. In the laboratory, students received a description of each part of the TG-FTIR system, as well as how to tune the system and to develop a method. The primary objective of the experiment was to guide them in the interpretation of results including thermograms, infrared spectra, DSC, and Gram Schmidt (GS) curves. For this, students prepared and analyzed cellulose fibers extracted from pineapple leaves and a mixture of them with sodium hydroxide (NaOH) and monoethanolamine (MEA). Students were initially instructed to study the TG, DSC, and Gram Schmidt curves and to identify the temperatures at which the most significant mass changes occurred. Then, they focused on analyzing the infrared spectra obtained at each temperature range. This practice allowed them to identify the gases emitted during fiber decomposition and the volatile character of the MEA as well as to corroborate the MEA presence in the fiber/MEA mixture. This procedure can be adapted to guide students in the analysis of pure substances and mixtures.
ISSN:0021-9584
1938-1328
DOI:10.1021/acs.jchemed.7b00826