## 2 Results and Discussion
### Materials Characteristics
#### 2.1.4 Nitrogen Low-Temperature Sorption Analysis  
The porosity characteristics of polymeric-inorganic microspheres were determined on the basis of low-temperature nitrogen adsorption-desorption measurements. In Figures 5 and 6 the isotherms and pore size distributions are presented for all studied DVB-TEVS materials. The structure parameters are presented in Table 2. The differences in the isotherm course and nitrogen uptake reflect an essential variation of the porous structure. The shape of adsorption isotherms indicates a small content of micropores and significant content of mesopores. The difference between the adsorption and desorption is  
Figure 4: Particle Size Distribution by volume analysis DV(R) for investigation systems: DVB:TEVS = 1:2 (**a**), DVB:TEVS = 1:1 (**c**) and DVB:TEVS = 2:1 (**e**). The insets of plots correspond to fit curves extrapolated for experimental SAXS data (**b**,**d**,**f**).  
observed for all samples as elongated hysteresis loop of H1 type. The decrease of nitrogen adsorption, specific surface area and pore total volume is well correlated with DVB:TEVS ratio, more TEVS content the higher structure parameters. The highest specific surface areas (S\({}_{\text{BET}}\)) are for DVB:TEVS = 1:2, the medium for DVB:TEVS = 1:1 and the lowest for DVB:TEVS = 2:1 with values: 521, 402, 316 m\({}^{2}\)/g, respectively. It is evident that the addition of crosslinking agent TEVS develops porous structure of organic-inorganic materials. The increase of pore size as the average value with increase of DVB content is observed, however, the differences are not significant. The pore size distribution functions for all studied materials show similar tendencies as those obtained from SAXS data. Generally, the determined values are in good agreement with data from SEM microscopy and SAXS analysis.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Surface Area (S\({}_{\text{BET}}\))**} & \multicolumn{2}{c}{**Pore Volume**} & \multicolumn{2}{c}{**Pore Size**} \\ \cline{2-7}
**Sample** & \multicolumn{2}{c}{**[m\({}^{2}\)/g]**} & \multicolumn{2}{c}{**[cm\({}^{3}\)/g]**} & \multicolumn{2}{c}{**[nm]**} \\ \cline{2-7}  & \multicolumn{2}{c}{**S\({}_{\text{BETTotal}}\) a**} & \multicolumn{2}{c}{**S\({}_{\text{MIC}}\) b**} & \multicolumn{2}{c}{**V\({}_{\text{Total}}\) c**} & \multicolumn{2}{c}{**V\({}_{\text{MIC}}\) d**} & \multicolumn{2}{c}{**D\({}_{\text{h}}\) e**} & \multicolumn{2}{c}{**BJ\({}_{\text{ADS}}\) f**} \\ \hline DVB:TEVS = 1:2 & 521 & - & 0.84 & - & 6.4 & 4.8 \\ DVB:TEVS = 1:1 & 402 & 2.5 & 0.74 & - & 7.4 & 5.1 \\ DVB:TEVS = 2:1 & 316 & 27 & 0.54 & 0.01 & 6.8 & 5.8 \\ \hline \hline \end{tabular}  
* S\({}_{\text{BET}}\), the BET specific surface area; b SMIC, the micropore surface area; c V\({}_{\text{T}}\), the total pore volume; d V\({}_{\text{MIC}}\), the micropore volume; c D\({}_{\text{h}}\), the average hydraulic pore diameter (4V/A); f BJ\({}_{\text{ADS}}\), average BjH adsorption pore diameter.  
\end{table}
Table 2: The values of parameters characterizing the porous structure of DVB-TEVS.  
Figure 5: _Cont._  
Figure 5: The nitrogen adsorption-desorption isotherms for DVB-TEVS materials (**a**), pore size distributions by the Barrett–Joyner–Halenda (BJH) with Halsey-Faas correction for desorption (**b**) and adsorption data (**c**).  
Figure 6: Pore size distributions obtained by Density Functional Theory with Model: N2 @ 77 K, Slit Pores. Method: Non-negative Regularization: 0.01000 and Standard Deviation of Fit: 6.62419 cm\({}^{3}\)/g STP.