Porosity analysis using the BJH method

The BJH method porosity analysis is particularly well suited to characterizing mesopores in solid materials. This approach makes it possible to use adsorption and desorption isotherms to determine pore size distribution, pore volume, and gain a better understanding of the material structure. For industrial users, this porosity analysis addresses concrete challenges: checking a raw material, comparing several batches, optimizing a synthesis process, explaining a drop in performance, or validating the compliance of a porous material. It is commonly used to study powders, catalyst supports, ceramics, adsorbents, carbon-based materials, and technical mineral materials. In addition, the interpretation can be cross-referenced with other characterization tests carried out within our Materials Laboratory.

BJH porosity analysis is relevant when the pore structure directly affects the material’s functionality. This is notably the case for catalyst supports, mineral powders, technical ceramics, carbons, oxides, adsorbents, or materials intended for filtration. The test makes it possible to identify differences between batches, monitor the effect of drying, calcination, activation, or a shaping step. It can also help explain a loss of accessible surface area, a change in reactivity, a modification in adsorption capacity, or different wetting behavior.

The BJH method porosity analysis provides key insights into the mesoporous network: pore size distribution, associated pore volume, and changes in texture between different samples. These data are particularly useful for assessing production consistency, qualifying a supplier change, monitoring aging, or measuring the impact of a physicochemical treatment. Interpreting the isotherms also helps better understand adsorption behavior and the availability of the internal surface area.

A porosity measurement requires appropriate sample preparation, a good command of operating conditions, and rigorous data interpretation. The choice of protocol, the nature of the material, its surface state, its thermal history, or its sensitivity to preparation can all influence the results. Using a specialized laboratory therefore helps make the measurement more reliable and obtain conclusions that can truly be used for your industrial decisions.

The laboratory supports industrial clients in material characterization and in solving formulation, process, or performance issues. Using a BJH measurement is not just about providing a curve: it must be linked to your technical need, whether that involves assessing surface accessibility, adsorption capacity, diffusion within the pore network, or the impact of heat treatment. Our approach consists of adapting the test conditions, checking data consistency, and delivering results that can be used for R&D, quality control, or comparative expertise. This approach is part of our broader expertise in materials science.

Depending on your objective, BJH results can be combined with other characterization analysis. Measuring BET specific surface area on powder, for example, can complement the interpretation of pore texture. Morphological examinations by electron microscopy can also be considered to visualize the surface state, particle shape, or certain heterogeneities. This combination of tests is useful for linking porosity data to the overall structure of the material and securing your development or quality control decisions.

The results are only valuable if they are put into perspective with the material’s final use. The same pore profile will not have the same meaning for a catalyst, an adsorbent, a ceramic, or a functional powder. The laboratory therefore delivers the data in a way that is actionable for your technical teams, with an application-oriented reading: batch-to-batch comparison, process influence, consistency with observed performance, and, if needed, further investigations within our Materials Laboratory.

Beyond the analytical data, the laboratory helps you turn a result into a lever for action: compare, qualify, optimize, investigate. This support approach is particularly useful during development, troubleshooting, or validation phases. It can also be part of a broader reflection on material performance and life cycle, alongside approaches such as materials life cycle analysis.

To begin a service, you need to define your technical requirements, provide information about the material and its intended use, send the samples to the laboratory, then have the data analyzed within the context of your industrial issue. Depending on your objectives, it is possible to complement the characterization with a specific surface area measurement, morphological analysis, or other materials characterization tests.