Nano Research & Applications

Specific surface area from nitrogen adsorption data at 77 K using the zeta adsorption isotherm

17^th Edition of International Conference on Emerging Trends in Materials Science and Nanotechnology
April 26-27, 2018 Rome, Italy

Charles A Ward, S Arman Ghaffarizadeh and Seyed Hadi Zandavi

University of Toronto, Canada Massachusetts Institute of Technology, USA

Posters & Accepted Abstracts: Nano Res Appl

DOI: 10.21767/2471-9838-C1-009

Abstract

The determination of the specific surface area (SSA) of solid powders has been a long standing problem in surface science. We use the zeta adsorption isotherm (ZAI) and propose a method for determining the SSA of powders using the N2 adsorption measurements at 77K. The consistency of the results obtained is demonstrated using two �±-alumina samples that have different total surface areas. When the proposed method is applied to convert the amount adsorbed per unit mass to the amount adsorbed per unit area, we show that there is no measurable difference between their adsorption isotherms. Also, we show the proposed method can be applied to six different powders having a variation in their specific surface areas of two orders of magnitude. The corresponding error can be obtained from a single equilibrium adsorption measurement and maximum standard deviation in the mean value of the SSA among six cases is less than 7%. charles.ward@utoronto.ca