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Published on: October 31, 2013
Cavitation and pore blocking in nanoporous glasses
C Reichenbach1, G Kalies, D Enke
1Institute of Experimental Physics I, University of Leipzig, 5 Linnéstrasse, D-04103 Leipzig, Germany. reichenbach@physik.uni-leipzig.de
Langmuir : the ACS Journal of Surfaces and Colloids
|August 9, 2011
Summary
Novel nanoporous glasses (NPG) reveal network effects in gas adsorption. Hysteresis transitions from H2 to H1 type with increasing pore width, indicating shifts in desorption mechanisms in disordered materials.
Area of Science:
- Materials Science
- Physical Chemistry
- Nanotechnology
Background:
- Porous glasses serve as model systems for disordered mesopore networks in gas adsorption studies.
- Accurate interpretation of physisorption isotherms necessitates understanding network effects during adsorption and desorption.
Purpose of the Study:
- To investigate gas adsorption and desorption mechanisms in novel nanoporous glasses (NPGs) with tunable mean pore widths.
- To explore the evolution of adsorption characteristics and hysteresis types with varying pore network structures.
Main Methods:
- Nitrogen and argon adsorption isotherms were measured at 77 K and 87 K on NPGs with varying mean pore widths.
- Comparison of adsorption behavior between NPGs and traditional porous glasses (Vycor, controlled pore glass).
Main Results:
- NPGs exhibit smaller mesopores and higher microporosity compared to Vycor and controlled pore glass.
- A gradual transition from Type H2 to Type H1 hysteresis was observed with increasing mean pore width.
- Evidence suggests a shift from cavitation-induced desorption to pore-blocking-controlled desorption and a pore size dependence of cavitation pressure.
Conclusions:
- The study provides insights into adsorption mechanisms in disordered porous materials, highlighting the role of pore network structure.
- Tunable pore widths in NPGs allow for detailed investigation of hysteresis evolution and desorption phenomena.
- Findings contribute to a better understanding of gas adsorption in complex nanoporous systems.
