Room Temperature Columnar Liquid Crystalline Perylene Bisimide as a Novel Corrosion Resistant Surface Film for Mild Steel Surface

Abstract

The corrosion process can be seen as a widespread phenomenon, which is both pervasive and unstoppable. This is an undesirable phenomenon that reduces the life of materials and takes away their beauty. Potentiodynamic and electrochemical impedance tests are used to explore the corrosion inhibition abilities of a room temperature columnar liquid crystalline perylene bisimide (PBIO10) on mild steel (MS) samples in 1 M HCl. The inhibitor PBIO10 was demonstrated to be an outstanding corrosion inhibitor, with a maximum inhibition efficiency of 76%. In light of potentiometric polarization results, corrosion inhibition was achieved as the inhibitor getting adsorbed on the metal, and they fit into the category of anodic inhibitors. The protective layer was examined from SEM to confirm the protective coating generated on the MS surface. The increase in contact angle confirms the formation of a uniform layer on the MS surface. Analysis of the optical textures observed in POM, the nature of the mesophase under examination to columnar rectangular (Colr) phase. From the TGA, it was found that PBIO10 exhibits higher thermal stability u to 370 ℃. The density functional theory (DFT) and Monte Carlo simulation approach were used to investigate the relationship between molecular structure and inhibitory efficacy. The thermal behavior of PBIO10 was investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and X-ray diffraction (XRD) studies. The phase transition from crystal to LC phase was at first examined with the help of POM observation. Graphical Abstract

Ambipolar Columnar Self‐assembled Organic Semiconductors based on Heteroatom bay‐Annulated Perylene Bisimides

“…Heteroatom bay ‐annulated perylene tetracarboxylic bisanhydrides ( 5 – 7 ) from perylene tetracarboxylic dianhydride (PTCDA) and their functionalization with trialkoxy phenyl group was carried out in good yields as reported earlier [31,32] . The key intermediate tri‐ n ‐decyloxybenzene ( 1 ) was prepared as reported earlier (Scheme 1, SI) [44] . The aniline obtained was condensed with PTCDA and its heteroatom bay ‐annulated analogues in presence of molten imidazole as solvent and zinc acetate as a catalyst under microwave conditions to yield the corresponding PBIs in 85% yield [31] .…”

“…It is also interesting to note that the PBI with six n ‐decyl chains exhibited columnar hexagonal phase, which differ from PBI O10 by the absence of oxygen atoms (Figure 1c). [43,44] …”

“…[31,32] The key intermediate tri-n-decyloxybenzene (1) was prepared as reported earlier (Scheme 1, SI). [44] The aniline obtained was condensed with PTCDA and its heteroatom bay-annulated analogues in presence of molten imidazole as solvent and zinc acetate as a catalyst under microwave conditions to yield the corresponding PBIs in 85% yield. [31] Similarly, the trialkyl phenyl-funtionalized PBIs have been synthesized in four steps as reported before.…”

“…[34] It is also interesting to note that the PBI with six n-decyl chains exhibited columnar hexagonal phase, which differ from PBI O10 by the absence of oxygen atoms (Figure 1c). [43,44] N-annulated PBI, compound PBI-N O10 exhibited broad birefringent leaf-like texture (Figure 2b), which is quite uncharacteristic for Col phases. Again the mesophase was stable at ambient temperature (Figure S15 and Figure S18b), with a slight decrease in the clearing temperature in comparison to PBI O10 .…”

Novel maleic anhydride derivatives: liquid crystalline materials with enhanced mesomorphic and optical characteristics

“…Each liquid crystal assembly that makes up a display pixel is governed by its own electromagnetic field. The field modifies the liquid crystals' orientation, which alters how much light can pass through them and result in the images you see on a screen (Alamro et al, 2021;Gomha et al, 2021;Abdou et al, 2022;Alamro et al, 2022;Chi et al, 2022;Uchida et al, 2022;Wang et al, 2022;Yin et al, 2022;Behera et al, 2023;Ma et al, 2023).…”