Nanomaterial pore types

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NanomaterialPore Types
With reference to Figure 1, we can classify pores according to how accessible they are to an external fluid. In this context,
one category (closed pores) consists of pores that are inaccessible to an external fluid and totally isolated from their
neighbors, as in region (a). Closed pores influence macroscopic properties such as bulk density, elasticity, mechanical
strength, and thermal conductivity, but they are inactive in processes such as fluid flow and adsorption of gases. On the
other hand, pores that have a navigable channel of communication with the external surface of the body (like b, c, d, e, and f)
are described as open pores. Open pores are further classified into "through pores" and "blind pores." Through pores have
an open channel that begins at one location on the surface, extends into the particle, and re-emerges on the surface at a
different location (like the pore channels c-e-c and c-e-d). Blind pores (also called dead-end or saccate pores) are open to the
surface only at one end (like b and f). A special distinction is made for blind pores like those in region of g of Figure 1.
While these small surface irregularities are technically blind pores, it is often more useful and convenient to consider them
separately as part of a distinct attribute, called surface roughness. A simple convention often used is to assume that surfac e
irregularities are counted as pores only if they are deeper than they are wide. Pores may be classified further according to
their shape. Common shape terms include cylindrical (open c or blind f), ink-bottle (b), funnel(d), and slit shapes.
Figure 1. Schematic cross section of a porous solid
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