The effect of polymer on the morphology and rheological behavior of silver nanoaqueous solution

ABSTRACT This work studies the effect of biopolymer on the flow behavior and morphology of silver nanoparticle (SNPs) dispersed in aqueous solutions using laser ablation technique. Polymer structures have the ability to control on the nanoparticles formation and flow properties of polymer nanosolution. Different concentration of Powder and granules poly vinyl alcohol (PVA) and corn starch are used to prepare the base solutions. Silver target with 99.99% purity is immersed in biopolymer solution. Nd- YAG laser ablation used to prepare polymer nanofluid at 20 pulses, 8ns pulse duration, 532nm wavelength and 600 mJ energy for each polymer. Absorbance spectra of (SNPs) solutions were measured by UV-VIS spectrophotometer. The morphological properties of nanosolutions are tested using atomic force microscopy AFM. The rheological behavior was investigated using cone-on-plate viscometer and surface tension device. The results show that the absorption peak of Plasmon at 400 nm indicated that the (SNPs) are present. This peak shifted to the left as the (PVA) and starch concentration increases. This means that the (SNPs) efficiency formation increases and (NPs) size and broadness decrease. The AFM results show that the size of nanoparticles decreases as the biopolymer concentration increasing. The viscosity and surface tension increase with the biopolymers concentration and (SNPs) size decreasing respectively. The absorption intensity decreases and viscosity increases after one month due to the agglomeration of (SNPS).The absorption spectrum show a small change in the fresh sample compared to aged sample in 1,2g of PVA powder, and 0.25, 0.5g of PVA granules. It shows that the Ag-NPs in 1,2g PVA powder solution and o.25, 0.5g PVA granules more stable than that of other polymer used. There is a good compatibility between optical, rheological and morphological tests.