Application of thermoporometry for characterization of mesoporous silicon: In search for probe liquid aimed at large pores
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CitationMajda, D. Ikonen, T. Krupa, A. Lehto V-P. Makowski, W. (2017). Application of thermoporometry for characterization of mesoporous silicon: In search for probe liquid aimed at large pores. Microporous and Mesoporous Materials, 264, 1-7. 10.1016/j.micromeso.2017.12.028.
Characterization of porous samples containing mesopores larger than 10 nm in size is often difficult due to limitations of standard methods. In the present work thermoporometry (TPM) was introduced to address these challenges. Various probe liquids (water, n-heptane, cyclohexane and o-xylene) were previously applied for TPM characterization of mesoporous silicon containing pores of 20–50 nm. The results, obtained with the use of calibration equations, confirmed the necessity of new probe liquid more suitable for characterization of such samples. Octamethylcyclotetrasiloxane was found to be the most appropriate choice. Mesoporous silicon samples were used as model materials in order to establish an empirical equation between the pore sizes, derived from mercury porometry, and the solid-liquid transition temperature depressions derived from differential scanning calorimetry for the octamethylcyclotetrasiloxane confined inside the pores and in bulk phase. The new calibration equations obtained within this work can be successfully used for characterization of the samples with large mesopores.