Continuous adsorption in highly ordered porous matrices made by nanolithography

Nature Communications
Giampaolo MisturaMassimo Tormen

Abstract

The exposed surface area of porous materials is usually determined by measuring the mass of adsorbed gas as a function of vapour pressure. Here we report a comprehensive study of adsorption in systems with closed bottom, not interconnected pores exhibiting different degrees of disorder, produced with methods encompassing nanolithography and dry and wet etching. Detailed adsorption studies of these matrices show hysteresis loops, as found always in pores having sizes of tens to hundreds of nanometres. The observed variations in the loop shape are associated with changes in the pore morphology. In regular pores formed by vertical and smooth walls, continuous adsorption is found for the first time in agreement with thermodynamic considerations valid for ideal pores. This suggests that irregularities in the walls and pore openings are the key factors behind the hysteresis phenomenon. Interestingly, pores having rough walls but a pyramidal shape also do not show any hysteresis.

References

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Citations

Sep 25, 2018·Nanoscale·Lorenzo BruschiWoo Lee
Jan 13, 2015·Nanoscale·Lorenzo BruschiWoo Lee
Jun 17, 2018·Physical Review. E·Alexandr Malijevský
Nov 22, 2020·The Journal of Chemical Physics·A L KolesnikovG Y Gor
Jan 27, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Olivier VincentAbraham D Stroock
Dec 7, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Lorenzo BruschiFrancesco De Angelis
Sep 21, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Mohamad Hassan AminSuresh K Bhargava
Apr 15, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Lorenzo BruschiWoo Lee
Jul 6, 2017··W. LeeG. Mistura

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