## 2 Results and Discussion
### Materials Characteristics
#### 2.1.3 SAXS Investigation  
Investigation of new materials requires the detailed analysis of structural aspects due to their importance in adsorption/desorption or immobilization processes. In this part, the microstructure of organic-inorganic materials was investigated by small-angle X-ray scattering. Table 1 includes the investigated materials and selected microstructure parameters determined from SAXS analysis. Figure 2: FTIR/ATR spectra for DVB:TEVS materials with phase ratios: 2:1, 1:1 and 1:2. Figure 3a shows logarithmic plots of the experimental scattering intensity I(q) as a function of the modulus of the scattering vector, q, corresponding to organic-inorganic samples with different component fractions. The scattering curve is continuous and contains no pronounced extremes or peaks. The lack of a sharp interference peak on the SAXS profile suggests the absence of the regular superstructural forms of domains [47]. The experimental scattering curve includes the sum of the scattering of various phases and their interactions [48; 49]. The nature of the scattering curve is similar for all studied samples. However, some differences in the level of scattering were observed. It was found that the introduction of the greater amount of TEVS into the polymeric body raises the intensity of scattering at low-angles. \begin{table}
\begin{tabular}{l c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multirow{2}{*}{**R**\({}^{\text{a}}\)[Å]} & \multirow{2}{*}{**PDDF**\({}^{\text{b}}\) [Å]} & \multirow{2}{*}{**PDDF**\({}^{\text{c}}\) [Å]} & \multirow{2}{*}{**PDDF**\({}^{\text{e}}\) [Å]} & \multirow{2}{*}{**Rg[Å]** [Sphere]**\({}^{\text{d}}\) [Å]} & \multicolumn{2}{c}{**Porod**} & \multicolumn{2}{c}{**Specific Surface**} \\  & & & **(PDDF)**\({}^{\text{e}}\) [Å]} & & & & & **Approximation** & & **Area** \\ \hline \multirow{2}{*}{DVB:TEVS = 1:2} & \multirow{2}{*}{45} & \(110\)(Spherical) & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} & \multirow{2}{*}{**} \\  & & 45(Rod-type & & & & & & & & & & \\  & cross-section) & & & & & & & & & & \\ \hline DVB:TEVS = 1:1 & 35 & 140 & 420 & 112 & 101 & 0.649 & 27.8 & 11.8 & 0.048 & 480 & 402 \\ DVB:TEVS = 2:1 & 30 & 179 & 504 & 110 & 95 & 0.511 & 29.6 & 13.3 & 0.039 & 390 & 316 \\ \hline \hline \end{tabular}  
* The volume-weighted particle size distribution DV(R) as the maximum value of the function. \({}^{\text{b}}\) Pair distance distribution function PDDF as the maximum value of the function. \({}^{\text{c}}\) Maximum dimension D\({}_{\text{max}}\) means also R-value (distance) at which PDDF goes to 0. This parameter is defined as diameter across the longest dimension of the particles and is zero for \(\tau>\)D\({}_{\text{max}}\). \({}^{\text{d}}\) Radius of gyration as the mean square distance from the center of their distribution. R\({}_{\text{g}}\) provides a measure of the overall size of the scattering objects. \({}^{\text{e}}\) R\({}_{\text{g}}\) determined from p(r) function is proportional to the normalized second moment of p(r) (Equation. (4)) from the whole scattering curve. \({}^{\text{f}}\) The Guinier plot, as ln([q]) vs. q\({}^{2}\) was used to determine the R\({}_{\text{g}}\) from the slope of the Guinier plot. \({}^{\text{g}}\) Porod constant is proportional to the surface area and the square of the electron density contrast. \({}^{\text{h}}\) Scattering invariant Q is proportional to the mean-square density fluctuation of scattering volume. Q = 2\(\pi^{2}\cdot\Delta\rho^{2}\cdot\)V where volume V and scattering contrast Ap. For calculation Q invariant the scattering intensities to q = 0 and also towards large q should be extrapolated. \({}^{\text{i}}\) Background constant which illustrates asymptotic decay of the SAXS curve at the high q values. \({}^{\text{j}}\) Surface area by SAXS calculated by Equation (2).  
\end{table} 
Table 1: Structural parameters of the investigated organic-inorganic systems.