Thermoporometry (TPM) is based on the fact that a fluid confined in the pores of a solid material, undergoes liquid to solid phase transition at a temperature considerably lower than its freezing point. The temperature shift (ΔT) is related to the size of pores, in which the liquid is trapped, according to the Gibbs -Thomson equation. In the standard experiment the sample of a porous material is soaked in the liquid medium, whose melting profiles are measured with Differential Scanning Calorimetry (DSC). This method is simple, inexpensive and non-destructive, it requires only a small amount of sample (c.a. 2 mg) and short time for an experiment (about 30 minutes). Owing to the possibility of using different liquid compounds TPM offers a wide range of potential applications. Water is the most commonly used liquid probe, especially for examining the hydrated materials which can change their properties during drying. n-Alkanes, with non-polar molecules exhibiting weaker surface-fluid interactions, can be used for porosity investigation of hydrophobic materials [1, 2]. Herein, we present a characterization of a series of SBA-15 silicas and their derivatives obtained by grafting with different amine groups, derived from water and n-heptane TPM, in comparison to N2 sorption and thermodesorption of n-nonane experiments [3]. The results demonstrate the necessity of using complementary methods to study properties of porous materials. The comparison of the methods led to the conclusion that water thermoporosimetry can differentiate the pore size and volume of samples that seem to be the same according to nitrogen sorption measurements. Fig 1. Pore size distribution (PSD) derived from different methods.