Adsorption Study of Porous Structure Development in Carbon Blacks

On the Micro-, Meso-, and Macroporous Structures of Polymer Electrolyte Membrane Fuel Cell Catalyst Layers

“…Concurrent with the filling of micropores, adsorption of a monolayer of N 2 occurs on the pore walls of meso-and macropores (>2 nm) and on the external surface of the particles. Although it is difficult to distinguish between these concurrent processes, the consensus is that the steeper is the rise in the adsorption isotherm at these very low partial pressures, the larger the total volume of micropores (13,32). As the partial pressure is increased, monolayer formation evolves into multilayer formation until the pore radius related to the capillary condensation at a given partial pressure is reached, instantly filling the pore.…”

Study of Microstructure of High-Surface-Area Polyacrylonitrile Activated Carbon Fibers

“…in the pore size affects the adsorption capacity for molecules of different sizes and shapes, and also this is one of the criteria by which carbon adsorbents are selected for a particular application. It is believed that, by using DFT theory (12), the pore size of samples from 0.4 to 400 nm could be obtained. In the present study, the standard DFT software was provided by Micromeritics Ins.…”

Nitrogen Adsorption Studies of PAN-Based Activated Carbon Fibers Prepared by Different Activation Methods

“…Nitrogen adsorption is a standard procedure for the determination of PSDs. The DFT program performs an inversion of the integral equation for the overall adsorption with respect to the PSD (18)(19)(20)(21)(22)(23)(24)(25). The experimental adsorption isotherm measured on a sample of a porous solid is the aggregate of the isotherm for the individual pores that make up the pore structure of the solid (if it is assumed that the external surface area is much smaller than the surface area of the pores).…”

“…The micropore volume and the external surface area were assessed from the high-resolution α S plot method (2,5,8,(12)(13)(14)(15)(16)(17). The pore size distributions (PSDs) of samples were calculated using density functional theory (DFT), which is based on a molecular model of adsorption of nitrogen in porous solids (18)(19)(20)(21)(22)(23)(24)(25). The DFT software was supplied by Micromeritics (Norcross, GA).…”