Improving stability of zinc nanoparticles in chitosan solution with a nanosecond pulsed laser

Abstract

A green method is presented to fabricate zinc nanoparticles using laser ablation synthesis in a natural polymer solution. The main aims are to reduce the zinc nanoparticles size and to increase their stability by using different ablation times in a chitosan solution as a natural polymer stabilizer. A Nd:YAG pulsed laser (532 nm) of energy 60 mJ/pulse, with a pulse duration of 10 ns was used to ablate a zinc plate immersed in chitosan solution from which the nanoparticles were produced. The average particle sizes as well as the volume fraction of the zinc nanoparticles in the solution were measured at 5, 10, 15, 30 min of ablation time. The results showed that the particle size decreased from 9.43 to 5.04 nm with spherical morphology and its volume fraction increased from 0.24 × 10−7 to 8.5 × 10−7 as the ablation time progressed from 5 to 30 min respectively. As a comparative study, a reasonable decrease was observed in the particle size for chitosan than distilled water. It was also noted that the stability and dispersion of zinc nanoparticles were much higher in the chitosan solution compared to water. In addition, the COSMO (conductor-like screening model) solvation model was used to compare the enthalpies of Zn-NPs in different media. Obtained results confirmed their stability was higher when merged in a natural polymer compared to water.

Inhibitory effect of zinc oxide nanoparticles and fibrillar chitosan‐zinc oxide nanostructures against herpes simplex virus infection

“…In agreement with previous studies, chitosan can increase the stability of ZnO NPs in aqueous environment. In other word, the excessive release of zinc ions would be controlled by chitosan, and thus; this property would avoid cell damages [44,45]. Our findings confirmed synthesized nanomaterials can internalize into cells, particularly more nanoparticles uptake could be seen when the incubation time increased (Figure 5)…”

The Influence of Ablation Speed on the Synthesis of Carbon Nanostructures Via Pulsed Laser Ablation of Asphalt in Ethanol

“…broadening of FWHM, i.e. red shift towards higher values in wavelength 255, 257, 258, 260 for S1 to S4 respectively , this coincides with the results obtained by 7,6,18 , the red shift in the spectrum refers to an increase in the particle size of the sample with lowering the ablation speed (increasing the ablation time, and this contradicts the results obtained by 7 and, 6 it seems that S3&S4 due to lowering the ablation speed the molecules of ethanol had adsorbed on the surface of the carbon nanostructures 4 , while S1&S2 have shown the narrower excitonic peak compared to the other samples which is an indication of the narrow size distribution of the nanoparticles of the colloid in these samples, 11 from the above obtained results, this confirm that uv-vis spectrum is size and concentration dependent. From Fig.…”

Diverse nanomaterials synthesized by laser ablation of pure metals in liquids

“…At extreme conditions induced by high-power LAL of Zn in water (e.g., 1.7×10 11 W/cm 2 at λ=1064 nm and 8.3×10 10 W/cm 2 at λ=532 nm excitation), the high-pressure phase of W-ZnO and ε-Zn(OH) 2 composite nanocondensates is producible [251]. Summary of products obtained by LAL of Zn is shown in Table 8 [71,72,101,243,[251][252][253][254][255][256][257][258][259][260][261][262][263][264][265][266][267]. Ishikawa et al [254] reported that the growth of ZnO particles into columnar structures starts at temperatures higher than 60°C and becomes finely crystalized at 80°C.…”

“…Yudasari et al [255] performed LAL of Zn in Pometia pinnata leaf extract (PPLE) solution and found that ZnO nanorods prepared in pure water transformed into smaller Zn/ ZnO spherical particles after adding PPLE, indicating the reduction and capping capacities of PPLE. Pure Zn NPs are obtainable in aqueous solutions containing chitosan biomolecules to inhibit oxidation [263]. With the aid of polymer conjugation, the colloidal stability is much higher than that produced in water [263].…”

“…Pure Zn NPs are obtainable in aqueous solutions containing chitosan biomolecules to inhibit oxidation [263]. With the aid of polymer conjugation, the colloidal stability is much higher than that produced in water [263]. In a less oxidative environment provided by H 2 O 2 (3%), ZnO 2 nanomaterials are produced [243].…”