Detemination of OH Surface Density of SiO2 by Thermal Gravimetric Analysis (TGA) (CAT#: STEM-ACT-0039-WXH)

Name: Detemination of OH Surface Density of SiO2 by Thermal Gravimetric Analysis (TGA)
SKU: STEM-ACT-0039-WXH
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Introduction

The surface of all metal and metalloid oxides is covered to varying degrees by hydroxyl groups or ions, which play an important role in the adsorption processes occurring at the oxide surface.
Silica powders are widely used in industry as fillers, catalysts, catalyst supports, adsorbents, and chromatographic agents, to name just a few. In each of these applications, knowledge of the surface properties is required in order to understand the physicochemical principles involved.

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Principle Applications Procedure Materials

Principle

Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. This measurement provides information about physical phenomena, such as phase transitions, absorption, adsorption and desorption; as well as chemical phenomena including chemisorptions, thermal decomposition, and solid-gas reactions (e.g., oxidation or reduction).

Applications

• Thermal characterization of polymers.
• Determination of the composition of alloys and mixtures.
• Determining the purity and thermal stability of both primary and secondary standards.

Procedure

TGA analysis is performed by gradually raising the temperature of a sample in a furnace as weight is measured on an analytical balance that remains outside the furnace. Thermogravimetric analysis instrument measures the changes in a sample's weight in a particular temperature by enclosing the sample in an oven.