Alternate layer by layered self assembly of conjugated and unconjugated Salen based nanowires as capacitive pseudo supercapacitor

A novel electrosynthetic method has been introduced based on alternate layer-by-layered self-assembly of conjugated/unconjugated Salen-based nanowires as a capacitive pseudo-supercapacitor. For this purpose, a three-electrode system consisted of a glassy carbon (GC), Ag/AgCl (Sat’d Cl−) and a Pt rod as working, reference, and counter electrodes, respectively. The electrolyte included the same molar concentration (0.040 mol L−1) of each Salen monomer (as initial precursor), and KCl solution (as supporting electrolyte), besides using KOH solution (0.01 mol L−1, as basic-controlling reagent) inside acetone/water (4:1, V/V) as a solvent. The formation of this self-assembly nanowire was attributed to the control of the electrical conductivity of this polymer during formation of an organometallic complex with K+ as responsible complex forming agent. This novel nanowire then played role as a capacitive pseudo-supercapacitor. Based on the chrono—potentiometry, reproducible charge/discharge process for at least 5000 cycles was observed at a potential between − 2.00 and + 1.75 V (vs. Ag/AgCl). The capacity behavior of the polymer was also evidenced using electrochemical impedance spectroscopy. This synthesized polymeric nanowire was adopted as the acceptable pseudo-supercapacitor with real capacity equals to 3110 ± 6 (n = 3) C g−1. This study was considered as the first report at which the self—assembly of organometallic compounds as an efficient pseudo—supercapacitor was introduced.

Synthesis and Characterization of a Polymer Matrix of Carrageenan, Chitosan and Hyaluronan on Stainless Steel 316L

A novel bioactive coating matrix consisting of three biopolymers – carrageenan, chitosan, and hyaluronan, was synthesized via alternate layer-by-layer (L-b-L) self-assembly of the oppositely-charged polyelectrolytes on a 316 L SS scaffold. The L-b-L deposition was carried out by substrate immersion in each polyelectrolyte solution for various length of time with 80 mins as the optimum time based on morphological non-homogeneity of coating evaluated through SEM. Co-60 γ-irradiation of the coating was done to enhance cross-linking. To test the coating matrix’s resitstance to shear stress, the coated scaffolds were subjected to agitation of 500 to 2000 rpm in phosphate buffer solution (PBS) for 24 hours. The biopolymer surface subjected to 500 rpm agitation did not exhibit noticeable surface changes and appeared similar to that of the control sample. The optimum coating was then evaluated for hemocompatibility and demonstrated low cytotoxicity with average live cell count of 77.54% after 48 hours of incubation.