الفهرس | Only 14 pages are availabe for public view |
Abstract Pulsed laser ablation in liquid (PLAL), is an unconventional, fast, eco- friendly, and direct technique for nanoparticles synthetization from bulk materials. These benefits allow us to combine the different solid targets and liquids to produce nanostructures materials with specific properties. Moreover, the produced nanoparticles are directly stabilized in the solvent without adding any complexing agents. On the other side, the presence of microbial attacks on the artifacts has shed considerable attention of the scientists in the last few years. Among microorganisms, fungi are one of the most damaging groups for the wooden artifacts particularly. Therefore, the scientists have multiple attempts to create and modify more advantageous trendy ways not only on the level of such infections treatment but also to fight their residual negative effects on the treated objects. In this regard, nanostructured stainless-steel solutions with different shapes, sizes and low concentrations were synthesized using femtosecond laser ablation in distilled water to study their properties as antifungal material for ancient wooden objects preservation. UV-Vis, TEM, DLS, and ICP-MS techniques were used to investigate desired phases, morphology, and concentration of the prepared NPs. Both laser and liquid parameters (laser power and liquid height) were tuned during synthesis to optimize and control the properties of produced NPs for better effect. The study contained too investigation of the ablated target surface under the abovementioned conditions. Ancient minuet samples of two different Pharaonic wooden objects were collected to be the guide in this study. The objects were selected from different burial environment (wet and arid soils) to study their degradation aspects then the effects of burial soil on the object’s biodeterioration. The study was carried out using different advanced investigation techniques. The activity of the prepared stainlesssteel NPs as antifungal material was tested on standard wood replicas which previously inoculated by the most frequent isolated fungal species (A. Niger & A. Flavus). Those replicas were thermally aged to be under the same deterioration conditions of the selected artifacts. Stainless- steel NPs recorded a strong inhibition for A. Niger growth, while A. Flavus recorded a clear resistance for prepared NPs by undetectable inhibition zone. |