RESUMO
This study presents an eco-friendly approach for constructing superhydrophobic (S.H.) coatings on steel surfaces. The biо Сu nanoparticles are synthesized using a biоgenic process. Two types of coatings, Ni-Ð .Α and Ni-biо Сu-Ð .Α, were developed and characterized. The EDX results confirm the successful fabrication of two distinct coatings on the steel substrate: one involving the modification of nickel with stearic acid, Ni-Ð .Α, and the other involving the modification of nickel with both bio-Cu and stearic acid, Ni-biо Сu-Ð .Α. The SEM results revealed that the S.H. coats exhibit circular microstructures which contribute to the surface roughness. The contact angles of water droplets on the Ni-Ð .Α and Ni-biо Сu-Ð .Α coatings were measured at 158° ± 0.9° and 162° ± 1.1°, respectively. Chemical stability tests demonstrated that the Ni-Ð .Α coating maintains its S.H. behaviour in a pH range of 3-11, whereas the Ni-biо Сu-Ð .Α coating exhibits excellent chemical stability in a broader range of pH (1-13). The coating's mechanical stability was evaluated through abrasion tests. The Ni-Ð .Α coating retained its S.H. properties even after an abrasion length equal 1100 mm, while the Ni-biо Сu-Ð .Α coating maintained its S.H. behaviour till an abrasion length equal 1900 mm. The corrosion behavior and protective properties of the S.H. coatings were studied via electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques. The PDP and EIS findings demonstrated that both Ni-Ð .Α and Ni-biо Сu-Ð .Α coatings significantly reduced the corrosion rate compared to uncoated steel.
RESUMO
Proline is water soluble amino acid extensively used in drug delivery systems. Compounds of cobalt (Co) transition metal have potent antimicrobial and anticancer activities. However, a drug delivery system combining proline cobalt is not reported yet. For the first time, new hybrid semi-organic single crystals of proline cobalt chloride (PCC) are prepared. The novelty of the article is also that single crystal proline cobalt chloride showed potent antimicrobial and antitumor activity. Doping of PCC by Ag0NPs significantly increased these biological activities. The anisotropic magnetic properties of single crystals can mitigate the cytotoxicity of Ag0NPs on normal cells. Silver nanoparticles (Ag0NPs) improved the crystal habits and physicochemical properties. Ag0NPs showed the best performance, paramagnetic materials n-type semiconductors due to delocalized excess electrons of Ag0NPs incorporated in the crystal lattice interstitially. Crystals have high absorptivity for UV-radiation electromagnetic radiation. Ag0NPs enhanced AC electrical conductivity up to 2.3 × 104 Ω cm-1 due to high electron density. Proline doped crystals are obtained in good purity as triclinic unit cell with having anisotropic magnetism. PCCAg0NPs crystal exhibited: high antimicrobial activities to various bacterial and fungal species, inhibition zone (mm): 21, 25, 24, 26, 30, 28, 12, and 46 for S. aureus, E. faecalis, S. typhi, E. coli, P. aerugino, K. pneumoniae, A. braselienses, and C. albicans, respectively, in comparison to ciprofloxacin antibiotic (23, 0, 26, 26, 25, 0, 0, 0) for the same tested species, respectively; higher cytotoxicity against breast cancer cells (IC50 22.1 µM) than the reference drug cisplatin (IC50 11.7 µM); and lower cytotoxicity to normal healthy lung cells MRC-5, (IC50 145.5 µM) than cisplatin (IC50 30.2 µM). Hence, this crystal is a candidate for chemotherapy of breast cancer.
