## 3 Results and Discussion  
### Characteristic of GE-EP@OIMs  
#### 3.1.1 Surface Morphology of GE-EP@OIMs  
Figure 3 shows the surface and internal morphology of the prepared GE-EP loaded with and without OIMs after vacuum drying. In the case of GE-EP without OIM loading, the internal morphology is characterized by non-uniformity and coarseness, with a multitude of spherical particles being present, these particles serve to create spatial accommodations for the subsequent incorporation of OIMs, as reported by [23]. However, the surface morphology of the GE-EP sample exhibits a smooth and planar appearance, which is an outcome of the specific preparation procedures employed. In contrast, for the GE-EP loaded with OIMs, the internal morphology, while still retaining a certain degree of roughness and topographical irregularities, demonstrates a significant reduction in such features compared to the OIM-free GE-EP. This phenomenon indicates the successful loading of OIMs, and furthermore, the addition of OIMs augments the binding forces between the epoxy resin, curing agent, gelatin, and BaSO\({}_{4}\), culminating in a more homogeneous dispersion of each constituent. Additionally, it is observable that pores with diameters ranging from 100 to 200 \(\upmu\)m are manifested on the surface of GE-EP@OIMs. These pores enhance the contact area between GE-EP@OIMs and the surrounding solution, thereby facilitating the release of the corrosion inhibitor.  
Figure 4 presents the EDS analysis of the internal structure of GE-EP@OIMs, illustrating the distribution of key elements, including sulfur (S), barium (Ba), carbon (C), nitrogen (N), and oxygen (O), within the solid corrosion inhibitor matrix. The EDS maps reveal that these elements are uniformly distributed across both the surface and the interior of GE-EP@OIMs, with particular emphasis on their even dispersion around small pores on the surface. Such uniform distribution is indicative of the efficacious dispersibility of the matrix corrosion inhibitor, weighting agents, synergistic agents, and other constituents like cement. Notably, a disparity in elemental composition exists between the surface and the interior. Precisely, the abundances of Ba and S elements are relatively lower on the surface in contrast to the interior. This discrepancy can be ascribed to the gravitational sedimentation of BaSO\({}_{4}\) particles during the cementation and molding procedures, which consequently engenders a marginally elevated concentration of these elements within the internal structure. The observed elemental distribution and its attendant uniformity substantiate the successful amalgamation of OIMs and other components, thereby contributing to the augmented performance of the material as a solid corrosion inhibitor.  
\begin{table}
\begin{tabular}{p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt} p{42.7 pt}} \hline \hline
**Time** **(Days)** & **Number of Measurements** & **Mass Before (mg)** & **Mass After (mg)** & **Weight Loss (mg)** & **Corrosion Rate (mm/y)** \\ \hline
1 & 3 & 120.543 & 120.214 & 0.329 & 0.5464 \\ \hline
5 & 3 & 120.214 & 119.876 & 0.338 & 0.8078 \\ \hline
10 & 3 & 119.876 & 119.532 & 0.344 & 0.4330 \\ \hline
20 & 3 & 119.532 & 119.19 & 0.342 & 0.7149 \\ \hline
30 & 3 & 119.19 & 118.85 & 0.34 & 0.8456 \\ \hline
40 & 3 & 118.85 & 118.51 & 0.34 & 0.6661 \\ \hline
50 & 3 & 118.51 & 118.17 & 0.34 & 0.4582 \\ \hline
60 & 3 & 118.17 & 117.83 & 0.34 & 0.4929 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Table summarizing measurements.  
Figure 4: EDS of GE-EP@OIMs: (**a**) Surface EDS showing elemental distribution. (**b**) Interior EDS showing elemental distribution.  
Figure 3: SEM Micrographs of GE-EP@OIMs. (**a**) Surface morphology without OIMs after vacuum drying. (**b**) Internal morphology without OIMs after vacuum drying. (**c**) Surface morphology loaded with OIMs after vacuum drying, orange for 200 \(\upmu\)m and blue for 100 \(\upmu\)m diameters ranging (**d**) Internal morphology loaded with OIMs after vacuum drying.