Poly 1-naphthylamine Research Articles

Synthesis and characterization of pH-responsive conducting polymer/Na-alginate/gelatin based composite hydrogels for sustained release of amoxicillin drug

Composite hydrogels of Na-Alginate (Na-ALG) and Gelatin (GEL) with conducting polymers (CPs) were synthesised using poly(o-phenylenediamine) (POPD), polyaniline (PANI), poly(1-naphthylamine (PNA) and poly(vinylenedine fluoride) (PVDF). The synthesised hydrogels were characterized using FTIR, scanning electron microscopy (SEM) rheology, swelling ability and in-vitro drug release characteristics. The purpose of this investigation was to determine whether these hydrogels could be used to deliver antibiotics for extended drug release. The composite hydrogels were loaded with antibiotic drug: amoxicillin in three different concentrations and the release was studied at intestinal fluid (pH 7.4) and gastric fluid (pH 1.2). Release kinetics was found to show best fit in zero order models at both pH values and showed prolonged release characteristics. The POPD-Na-ALG/GEL showed highest release at intestinal pH of 7.4, while PVDF-Na-ALG/GEL showed highest release at gastric pH at 1.2.

Nanocomposites of poly(1-naphthylamine)/SiO2 and poly(1-naphthylamine)/TiO2: Comparative photocatalytic activity evaluation towards methylene blue dye

The in situ polymerization of 1-naphthylamine monomer with silica (SiO2) and titania (TiO2) was adopted for the preparation of distinct poly 1-naphthylamine (PNA)/SiO2 and PNA/TiO2 nanocomposites. The absorption spectra of the nanocomposites showed a considerable red shift compared to pristine PNA which indicated the decrease in the orbital overlap between the π-electrons of the naphthyl rings with the lone pair of the nitrogen atom in the PNA molecules. The structural and the surface characterizations presented an effective interaction through the hydrogen bonding between imine (–NH) of PNA and hydroxyl (–OH) group of nanomaterials (SiO2/TiO2). The prepared nanocomposites showed a significant photocatalytic activity for the degradation of methylene blue (MB) dye under visible light illumination. It was found that MB dye degraded more efficiently by ∼60% over the surface of PNA/TiO2 nanocomposites than PNA/SiO2 (∼28%) and pristine PNA (9%) might due to the existence of high photogenerated ē–h+ pairs charge separation.

A novel nitrite sensor based on poly-1-naphthylamine doped by a ferrocenesulfonic-acid-modified electrode

A novel sensor for detecting nitrite based on poly-1-naphthylamine doped by a ferrocenesulfonic acid (PNAFc) modified electrode has been proposed. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) have confirmed that ferrocene-sulfonic acid (Fc) can be doped in poly-1-naphthylamine (PNA) and enhances its electrochemical activity. In a nitrite solution, the PNAFc electrode shows an excellent electrocatalytic activity for the oxidation of nitrite. Based on differential pulse voltammetry (DPV), the response was evaluated with respect to pH, scan rate, temperature, and other variables. The optimum analytical conditions for the determination of nitrite were established. Under optimum conditions, the linear range for nitrite determination was from 0.5 to 100 μM with a detection limit of 0.5 μM. The stability and anti-interference ability of the PNAFc electrode were also evaluated. The results indicate that this sensor is feasible for the determination of nitrite in real water samples.