This was achieved by combining high cellulose content with a suitable balance between fibre wall SSA and fibre wall average pore size.
A TiO2 nanotube (TONT) with an average pore diameter, length, and wall thickness of about 120 nm, 400 nm, and 20 nm, respectively was grown anodically on a Ti substrate.
When the results of FSP measurements are combined with NMR estimates of the SSA, also measured when the sample is in a water-swollen state, the average pore size of the fibre wall can be estimated [ 19].
The film shows a connected network with average pore size of 100 nm and a pore wall thickness of approximately 30 nm.
Measuring pore size distributions, or average pore sizes, in a water-swollen fibre wall or a fragment of such a wall is quite complicated and prone to errors, partly due to the soft nature of the material when in a water-swollen state.
Generally, nanoparticles smaller than 100 nm were favorable for extravasation of the nanoparticles into tumors through EPR effect, because the discontinuous endothelium of tumor blood vessels form many pores ranging in size from 200 nm to 2 μm with the average pore size approximately 400 nm on the vessel walls [ 39].
If one conceives of the β-glucan and chitosan layers as a meshwork of overlapping and cross-linked carbohydrate chains, then the diffusion of soluble molecules through the wall will be governed by the average pore size of that mesh.
In total, 200 measurements based on four different reconstructions were performed to obtain statistically relevant results, yielding an average pore size of 2.10 ± 0.3 nm and average silica wall thickness of 2.40 ± 0.4 nm (the corresponding histograms are shown in Figure S4).
Knudsen diffusion where fluid molecule collides with pore wall (happens when molecular mean free pathway closer to pore size).
As to the sample with average pore size of 150 μm, MAO coatings were formed on both outer and inner pore walls throughout the depth.
