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In the same way, nitrogen adsorption/desorption of the samples before and after drug loading should reveal similar isotherms, although the porosity and surface area values might be reduced as a consequence of the pore filling with the drug mol- ecules, as observed in Figure 2.5.
The same type of isotherms together with the small-angle XRD patterns should be good enough to confirm that the uptake process has not destroyed the organized mesostructure of these ordered mesoporous matri- ces.
FIGURE 2.6 Typical adsorption/desorption isotherm of SBA-15 type ordered mesoporous materials.
over a range of partial pressures at a single temperature results in a graph known as an adsorption isotherm, as shown in Figure 2.6.
Among the five types of adsorp- tion isotherms established by the BDDT (Brunauer-Deming-Deming-Teller) method (Brunauer et al. 1940), porous adsorbents with pores in the radius range of approxi- mately 15-1000 Å (mesopore range) present type IV isotherm.
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