PARTICLE SIZE DETERMINATION: LASER DIFFRACTION
Particle size analyses are carried out in a LS13320 equipment by Beckman Coulter.
The equipment has three analysis units:
-Tornado Dry Powder Module: Dispersion liquid is not required in this module and it is possible to determine a minimum particle size of 0.4 microns.
-Universal Liquid Module: This module allows to measure the size particle in different dispersion liquids and it is able to determine a minimum particle size of 40 nm.
-Micro Liquid Module: This model is suitable for small sample quantities in different dispersión liquids. The mínimum particle size determined is 0.4 microns.
The laser diffraction analysis are performed according to ISO 13320:2009 Particle size analysis – Laser diffraction methods
Technical staff: Ana Isabel Felipe, Isaías Fernández
Helium pycnometry analyses are carried out in Accupyc 1340 by Micromeritics.
The equipment has a nominal cell volumen of 10 cm3 with multivolume option to analyze different sample amounts (1, 3.5 y 10 cm3). In addition, it is provided with a temperature-control unit to perform analysis at different temperatures.
Technical staff: Ana Isabel Felipe, Elvira Aylón
Total pore volumen and pore size distribution in porous materials are determined by physisorption and mercury porosimetry.
-Physisorption analyses are carried out in ASAP2020 (Micromeritics). This equipment allows to obtain adsorption isotherms for mesoporous and microporous materials. The microporosity can be studied by using N2 or CO2 as adsorbate.
-Mercury porosimetry is performed in AUTOPORE V (Micromeritics). This analysis allows to determinate total pore volumen and pore size distribution for mesoporous and macroporous materials.
Analyses for porosity determination are performed according to ISO 15901(1-2-3): Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption.
Technical staff: Mª Dolores Domínguez, Ana Isabel Felipe, Isaías Fernández
SPECIFIC SURFACE AREA
The determination of the specific surface area of solids is carried out by N2 physisorption at 77 K in ASAP2020 (Micromeritics). For this porpuse, the amount of physically adsorbed gas is measured and the Brunauer, Emmett and Teller (BET) method is aplicated.
Physisorpion analysis and the determination of the specific surface area by BET method are performed according to ISO 9277: Determination of the specific surface area of solids by gas adsorption – BET method.
Technical staff: Mª Dolores Domínguez, Isaías Fernández