Colloid and Nanoscience Journal
Volume:1 Issue: 3, Aug 2023

Co-Ag granular films were prepared by electrodeposition method. The influence of the composition of thin films on their structure, granular size and magnetotransport properties is presented. structural techniques (XRD and TEM) confirmed the heterogeneity of the deposits with a size distribution from superparamagnetic to ferromagnetic particles. Fcc-Ag and Fcc-Co were present in the coatings. The increase of the Co concentration in the film alloys leads to an increase in the size of magnetic granules and a simultaneous decrease of the distance between them. The in-plane easy magnetization axis is found for all samples. Using these results, we computed the first, second magnetic anisotropy factors. Values of the computed effective magnetic anisotropy factors higher than 0.23×106 erg/cm3 have been found.

New poly(urethane-imide)s (PUIMs/MWCNT) nanocomposites (8a & 8b) containing two different amounts of MWCNTs were prepared by in situ polymerization technique. Transmission electron microscopy (TEM) showed that MWCNTs were exfoliated in the polymer matrix, resulting in well-dispersed morphologies at 1.5 and 2.5 mass% MWCNT contents. The effects of multiwall carbon nanotubes (MWCNT) on the thermal property of new PUIMs/MWCNT derived from N-trimellitimido-L-valine were investigated by thermogravimetric analysis (TGA) in nitrogen atmosphere. TGA results showed that the addition of MWCNT resulted a substantial increase of the thermal stability and char yields of the nanocomposites compared to the neat PUIMs. TEM experiments show morphology and good dispersion of nanotubes in polymeric matrix. The X-ray pattern of the PUIMs/MWCNT nanocomposites (8a) showed the combined peaks appearing in the MWCNT and pure PUIMs (7). Also new poly(urethane-imide) (7) with hard imide ring segments in the main chain was prepared and characterized.

The boiler anti-corrosive of the present work is based on a novel phosphate-free nanocolloid containing poly(methyl methacrylate) (PMMA) nanoparticles, an amine compound represented by formula (NH2—(CH2)m—O—(CH2)n—OH), (wherein each of m and n is an integer of 1 to 3), and an oxygen scavenger. The anti-corrosive was prepared by a simple mixing at ambient conditions. First, three types of microemulsion systems with different concentrations of surfactant were prepared and used to obtain three colloids of PMMA nanoparticles with a variety of particle sizes and then added to an amine/ oxygen scavenger mixture. The anti-corrosive activities of the resulting nanocolloids were used in a boiler operated with a superheater and a steam turbine, which is treated with water, is fed. The obtained results show that the used nanocolloid can more effectively maintain the pH of boiler water and prevent corrosion not only in the boiler tank but also in the entire boiler system including a feed-condensate system, without adding a large amount of phosphate salt.

Ag nanocolloid was prepared by green synthesis method using gum rosin as a capping and reducing agent and silver nitrate (AgNO3). The prepared Ag nanocolloid was characterized by using different analytical techniques such as UV-Vis, Dynamic light scattering (DLS), Zeta potential, Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), and Transmission electron microscopy (TEM). UV–visible spectra of the prepared Ag nanocolloid showed a sharp peak at ∼425 nm corresponding to the surface plasmon resonance (SPR) of the silver nanoparticles that were capped with gum rosin molecules. Ag nanoparticles with a diameter of 15-30 nm were observed in TEM and DLS analysis. A negative zeta potential value of −20.54 mV proved the stability of the rosin-stabilized silver nanoparticles. The Ag nanocolloid has shown an antibacterial activity against model organisms, a gram-negative Escherichia coli NCIM 2931 in Mueller–Hinton (MH) medium, which is hitherto unattempted up to now. In this study the ratio of Minimum Inhibitory (MIC) and Minimum Bactericidal Concentration (MBC) (MIC/MBC) was equal to 1, the green synthesized nanocolloid can be regarded as possessing an antibactericidal performance. The Ag nanocolloid with monodispersed Ag nanoparticles is considered to have potential applications in a variety of fields such as nanosensors, catalysis, electronic devices, and batteries.

In this investigation, a novel type of zinc oxide supported on clinoptilolite zeolite ZnO /Clinoptilolite (ZnO/CP) nanophotocatalyst was prepared based on the solid-state dispersion (SSD) method. The prepared nanophotocatalyst was characterized with XRD and SEM techniques. As an application, the photocatalytic degradation of malachite green dye in water under UV irradiation was studied. The results show that the ZnO /CP is an active photocatalyst and the maximum effect of photodegradation was observed at 10 wt.% ZnO, 90 wt% Clinoptilolite. A first-order reaction with K = 0.0075 min-1 was concluded. The effects of some parameters such as pH, amount of photocatalyst, and temperature were also examined. Finally, a mechanism was introduced for MG photodegradation.

Here we explain the successful synthesis of a new polymeric nanocomposite and study the removal of a cationic dye, brilliant green, from aqueous solutions. The nanocomposite is characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, adsorption kinetics and effects of various variables such as solution pH, adsorbent mass, and initial dye concentration are investigated. Moreover, the fuzzy model is used to investigate the dye removal efficiency. The investigation of the results obtained using the fuzzy model shows that it is suitable for the prediction of dye adsorption onto nanocomposite. The coefficient of determination (R2) and mean squared error (MSE) for the optimal model were obtained to be 0.9981 and 0.1538, respectively. The equilibrium experimental data are represented by Langmuir, Freundlich, and Sips isotherms. Results briefly indicate that adsorption of dye by nanocomposite obeys Langmuir isotherm and pseudo-second-order kinetic model.