Charakterisierung von Kieselgelen mit bimodaler Porenstruktur mittels Positronenlebensdauer‐Spektroskopie

Abstract

Characterization of Hierarchical Silica Gels with Positron Annihilation Lifetime SpectroscopyIn this study the results of the characterization of hierarchical silica-gel samples with nitrogen adsorption and positron annihilation lifetime spectroscopy (PALS) were compared. The hierarchical silica-gel samples were synthesized by pseudomorphic transformation of a meso porous silica gel with CTAOH. The results of the PALS measurements clearly indicate the hierarchical pore structure of the materials. Two individual pore systems can be detected with a good resolution. The peak area of the signals can be calculated and compared with the pore volumes determined by nitrogen adsorption.

Characterization of Porous Silica Materials with Water at Ambient Conditions. Calculating the Pore Size Distribution from the Excess Surface Work Disjoining Pressure Model

“…This silica gel was transformed via a modified approach of Galarneau et al [18,19] The preparation procedure has been described in detail in a foregoing publications [14,20,21]. This silica gel was transformed via a modified approach of Galarneau et al [18,19] The preparation procedure has been described in detail in a foregoing publications [14,20,21].…”

“…The preparation procedure has been described in detail in a foregoing publications [14,20,21]. For comparison the PSDs from NLDFT and BJH methods were obtained and their features compared to the ESW-DP method showing close correspondence between the ESW-DP and the NLDFT methods and significant deviations between BJH and the other methods.…”