Probing the microporous nature of hierarchically templated mesoporous silica via positron annihilation spectroscopy

Internal and external surface characterisation of templating processes for ordered mesoporous silicas and carbons

“…53 Additionally, microporosity stems from the window size that adjoins the adjacent spherical cells. 25 With regard to the PALS t 3 measurements, noteworthy is the relative disorder of MCF-SIL. An increased positron lifetime was observed for (0.82 ns), in comparison to SBA-SIL (0.75 ns) and KIT-SIL (0.76 ns), Fig.…”

“…In this work we introduce positron annihilation lifetime spectroscopy (PALS) for probing the pore size distribution of mesoporous silicas with large pores. PALS has been employed to some extent on mesoporous silicas, [25][26][27][28][29][30] including more detailed characterisation of microporosity within SBA-3 31 and the MCM family of silicas. [32][33][34][35][36][37] However, with careful control of experimental conditions, it is also useful for characterisation of mesopores.…”

Positron annihilation study of pore size in ordered SBA-15

“…The PALS technique has also been recently used to determine micropore size in SBA-15 [22], revealing micropores with a 0.63 nm diameter in samples aged at 80°C. Boskovic et al [23] investigated mesoporous silica materials with PALS and found that the number of micropores decreases with increasing synthesis aging temperature.…”

Development of functionalized mesoporous silica for adsorption and separation of dairy proteins

“…FDU-12 was amino-functionalised using (3-aminopropyl)triethoxysilane (APTES) in dry toluene to avoid undesirable side reactions of the APTES with water [31]. Typically, 2.0 g of FDU-12 was added to 75 mL of dry toluene.…”

“…This has been observed previously for MCF materials. [35] Figure 3 shows the kinetics of adsorption of both αlactalbumin and βlactoglobulin on unfunctionalised FDU-12. These data show that FDU-12-100, i.e.…”