توليد نانوالياف متا-آرآرميد حاوي نانوساختارهاي آلياژي نيكل-تنگستن براي كاربرد محافظت در برابر امواج ايكس

With the increasing use of ionizing radiation in medicine, industry, an‎d agriculture, effective radiation protection has become increasingly important. Lead is widely used as a shielding material; however, its heavy weight, limited flexibility, an‎d environmental concerns have encouraged researchers to explore alternative materials. In this study, lightweight, flexible, an‎d lead-free meta-aramid nanofibers (mANFs) containing 40 wt.% nickel–tungsten alloy nanostructures were fabricated by electrospinning for X-ray attenuation. First, nickel–tungsten (Ni:W) alloy nanostructures were synthesized via a hydrothermal method, an‎d the effects of synthesis time (6, 15, an‎d 24 h) on their structural, morphological, an‎d optical properties were investigated. XRD results showed that increasing the synthesis time eliminated the impurity phase observed in the Ni:W-6 sample, while only the nickel tungstate phase was detected in the Ni:W-15 an‎d Ni:W-24 samples. FESEM an‎d TEM images revealed that the nanostructures exhibited an approximately spherical morphology. Additionally, DLS results showed that Ni:W-15 had the smallest average particle size of 145 nm among the synthesized samples.The optical properties of the nanostructures showed that the Ni:W-15 sample had the lowest ban‎d gap energy of 2.53 eV, with a PL emission peak observed at 603 nm. The mANF an‎d Ni:W-containing composite nanofibers exhibited a continuous, bead-free morphology. The incorporation of Ni:W nanostructures increased the average fiber diameter, with the highest value of 250 ± 53 nm observed for the mANF/Ni:W-24 sample. The incorporation of Ni:W nanostructures enhanced the mechanical performance of the composite nanofibers, as the tensile strength increased from 17.45 ± 0.98 MPa to 36.52 ± 4.05 MPa. Among the prepared samples, mANF/Ni:W-15 showed the best X-ray shielding performance at 30 keV, achieving 92.88% attenuation an‎d a linear attenuation coefficient of 13.21 cm⁻¹. The MCNP simulation results were in good agreement with the experimental data. These findings indicate that Ni:W containing composite nanofibers represent an effective, lightweight, an‎d lead-free material for X-ray shielding applications.

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حسين توانايي , حسين فشندي