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BET theory can be applied to estimate the specific surface area of activated carbon from experimental data, demonstrating a large specific surface area, even around 3000 m 2 /g. [13] However, this surface area is largely overestimated due to enhanced adsorption in micropores, [ 6 ] and more realistic methods should be used for its estimation ...
Specific surface area (SSA) is a property of solids defined as the total surface area (SA) of a material per unit mass, [1] (with units of m 2 /kg or m 2 /g). Alternatively, it may be defined as SA per solid or bulk volume [ 2 ] [ 3 ] (units of m 2 /m 3 or m −1 ).
The air permeability specific surface of a powder material is a single-parameter measurement of the fineness of the powder. The specific surface is derived from the resistance to flow of air (or some other gas) through a porous bed of the powder. The SI units are m 2 ·kg −1 ("mass specific surface") or m 2 ·m −3 ("volume specific surface").
Researchers at Cornell University synthesized an ultrahigh surface area activated carbon with a BET area of 4800 m2 g–1. [1] This BET area value is the highest reported in the literature for activated carbon to date. For charcoal, the equivalent figure before activation is about 2–5 square metres (22–54 sq ft). [5] [6] A useful activation ...
Moreover, specific surface area is a scale-dependent quantity, and no single true value exists for this parameter. [1] Thus, the use of alternative probe molecules can often result in different obtained numerical values for surface area, rendering comparison problematic. The model also ignores adsorbate–adsorbate interactions.
The specific gravity of silica fume is generally in the range of 2.2 to 2.3. The specific surface area of silica fume can be measured with the BET method or nitrogen adsorption method. It typically ranges from 15,000 to 30,000 m 2 /kg.
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It is the most widely used adsorbent since most of its chemical (e.g. surface groups) and physical properties (e.g. pore size distribution and surface area) can be tuned according to what is needed. [32] Its usefulness also derives from its large micropore (and sometimes mesopore) volume and the resulting high surface area.