Determining the Geometric Surface Area of Mesoporous Materials

Abstract

Specific surface area is an important property of porous materials and a crucial index in multiple disciplines, which is mainly measured using nitrogen isotherms and the Brunauer–Emmett-Teller (BET) equation. The BET surface area is remarkably higher than the geometric surface area, which is defined as the surface area of the crystal geometry structure. However, many studies directly use the BET surface area as the geometric surface area. We proposed a simple, general, and accurate method that only needs the nitrogen adsorption isotherm as the input to calculate the geometric surface area of mesoporous materials. The proposed method considers the adsorptive potential influences and the physical state of adsorbed nitrogen in estimating the surface area. We utilized 18 isotherms generated by molecular simulations and actual experiments to cover a wide range of materials, including minerals, catalysts, and carbon-based tubes, and validate the effectiveness of the proposed method. Our results showed that the surface area determined by the proposed method is almost identical to the referenced geometric area. The surface area obtained by the proposed method can be typically considered a geometric surface area.

Structural and Electronic Properties of Two‐Dimensional Materials: A Machine‐Learning‐Guided Prediction

“…Numerous chemical and biological processes take place at or very close to a material's surface, making precise measurements of this area essential in many scientific and engineering fields. There are few previous studies where it has been shown that ML can accurately predict the surface areas of few systems with a very high accuracy rate [56–58] . In this manuscript, we were motivated by the significance of these goal attributes to attempt the development of a universal model that can accurately predict all of the target properties using a single set of inputs.…”

“…There are few previous studies where it has been shown that ML can accurately predict the surface areas of few systems with a very high accuracy rate. [56][57][58] In this manuscript, we were motivated by the significance of these goal attributes to attempt the development of a universal model that can accurately predict all of the target properties using a single set of inputs.…”

Void Formation and Radiation‐Induced Ion Migration in Perovskite Solar Cells under 10 MeV Proton Radiation

“…This is an interesting finding since many reports found that grain boundaries of perovskites often contain numerous defects, and they are detrimental to the device performance. [38][39][40] Steady-state photoluminescence (PL) spectra shows no significant wavelength shift in the irradiated films (Figure 2a) while there is a small shift in the CL result for samples of 1e13 p cm À2 fluence. Based on Figure S4, Supporting Information, we detected the CL peaks of 776.0, 775.8, 786.0, and 775.2 nm for fresh sample, and 1e12, 1e13, and 1e14 p cm À2 , respectively.…”

Enhanced Entanglement and Quantum Steering Induced by a Common Reservoir in Cavity Magnomechanics

“…Microscopically, dissipative coupling results from the traveling‐wave‐induced cooperative external coupling. [ 44–46 ] Nair et al. proposed a bistability scheme in a cavity magnonics system with dissipative coupling by utilizing Kerr effect.…”