Linear and Nonlinear Optical Properties of PVA:SA Blend Reinforced by TiO2 Nanoparticles Prepared by Flower Extract of Aloe Vera for Optoelectronic Applications

Abstract

In this study, a polyvinyl alcohol–sodium alginate blend, PVA:SA 3:1 (w:w), was doped with different contents of TiO2 nanoparticles (NPs) prepared by aloe vera leaf extract to form the investigated nanocomposites. The nonlinear parameters of third-order susceptibility (χ(3)) and refractive index (n2) were detected by using UV-Vis spectroscopy and Z-scan techniques. Some different optical parameters were also determined, including the refractive index (n), optical dielectric parameters, volume and surface energy loss functions, and some others. The best solar skin protection factor (SSPF) was investigated by 5 wt.% of TiO2 NPs doped in PVA:SA 3:1, which was about 84.6% compared to the corresponding value of the host blend (41%). The studied nanocomposites were examined for their utility in the optical limiting of CUT-OFF laser filters utilizing a continuous He-Ne laser working at 632.2 nm. As a result, our finding demonstrated that TiO2 NPs doped in the host blend of PVA:SA positively influences a laser light blocking for the investigated laser source. Using the estimated gap energies values, different models were used to deduce theoretical values of the linear refractive index (n). The presence of Ti peaks in the EDX spectrum confirmed the doping of TiO2 NPs in the nanocomposites. SEM showed that the TiO2 NPs are homogeneously dispersed through the host blend with some agglomerates. XRD spectra showed that the values of the lattice strain εstr. detected at 2ϴ = 19.78° are 0.058, 0.055, and 0.060, corresponding to 1, 3, and 5 wt.% of TiO2 NPs doped in the PVA:SA blend.

Agro-Waste Valorization into Carbonaceous Eco-Hydrogel: A Circular Economy and Zero Waste Tactic for Doxorubicin Removal in Water/Wastewater

“…Therefore, the amorphous nature of MSAC might enhance the adsorption capacity for pollutants such as Doxo.HCL. This is supported by the presence of SA, which was confirmed by the peaks appearing at about 13.58° and 40.50° theta angles in Figure b.…”

Physical characterization, biocompatibility, and antimicrobial activity of polyvinyl alcohol/sodium alginate blend doped with TiO2 nanoparticles for wound dressing applications

“…Based on the (SEM) images of the same investigated samples used in a prior study conducted by the authors 35 , TiO 2 nanoparticles suffered from agglomeration, which occurred with the increase in its concentration in the host matrix. This might reduce the hydrophilic property of TiO 2 NPs, which is in agreement with a previous study 74 .…”

“…Secondly, in a previous study conducted by the authors, PVA:SA:TiO 2 nanocomposite films were created utilizing a solvent-casting process 35 . In summary, a homogeneous solution was obtained by mixing and constantly stirring PVA and SA solutions (PVA: SA 3:1 w/w) for a duration of 6 h. After a short time of sonication, several suspensions of TiO 2 nanoparticles (NPs) with concentrations of 0 wt.%, 1 wt.%, 3 wt.%, and 5 wt.% by weight were added to the pre-prepared solution of PVA and SA.…”

Cleaner Biofuel Production via Process Parametric Optimization of Nonedible Feedstock in a Membrane Reactor Using a Titania-Based Heterogeneous Nanocatalyst: An Aid to Sustainable Energy Development

“…SEM was performed following gold sputtering (JOEL-JSM-5910, Peabody, MA, USA). An energy-dispersive X-ray spectrum in the range of 0-1350 eV was used to investigate the sample composition and to perform an elemental analysis of the TiO 2 nanocatalyst [35,36].…”