Thermal analyses study the evolution of different parameters of a material (mass, heat flux, temperature difference) as a function of temperature, in a controlled atmosphere (air, inert gas, hydrogen, vacuum).
Microtexture analyses focus on the density, specific surface area and porosity (volume, surface area, shape and size of pores) of a sample.
Granulometry is used to determine the diameter distribution of particles, ranging from a few tenths of a nanometer to several millimeters, either suspended in a liquid medium or dry.
Finally, zetametry measures the zeta potential of particles suspended in a liquid medium. Measurements of zeta potential as a function of various parameters (pH, ionic strength, etc.) provide highly relevant information on interactions between particles or with chemical species present in the medium.
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Local collaborations with CEISAM, the Laboratoire de Planétologie et Géosciences (LPG) and the RMeS laboratory.
Examples of pycnometer, zetameter, granulometer and porosimeter applications
Tricalcium phosphate (TCP) is a food additive, labeled E341(iii), used in the preparation of powdered foods such as baby formula. In this publication, three different samples (from one chemical company and two manufacturers) were thoroughly characterized according to the recommendations of the European Food Safety Authority.
a) N2 adsorption/desorption isotherm for samples E341(iii).
b) Diameter of E341(iii) A, B and C agglomerates under neutral pH conditions (pH 6.87, 7.00 and 6.47 respectively) at room temperature.
c) Measurement of the zeta potential of E341(iii) A, B and C as a function of pH. Although zeta potential values are reliable below pH 6, E341(iii) begins to dissolve (gray area). Three trends (numbered arrows) are observed.
Example of DLS (Dynamic Light Scattering) analysis
DLS analysis of a TiDMF.4H2O sol (colloidal suspension) obtained by oligomerization of TiOCl2 in DMF in the presence of water. Figure (a) shows the scattered light intensity distribution and figure (b) shows the same distribution, converted into percentage by volume.
Example of zetameter use
Study of the interaction between titanium dioxide (TiO2, Degussa P25) and phospholipid molecules (DMPA): measurements of zeta potential as a function of pH reveal that interactions between the two compounds are favored at pH below 6, where surface charges are opposite.
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