Controllable Synthesis Of Bismuth Tungstate Nanocrystal And Its γ-ray Shielding Properties Of NR Composites

γ-ray has been widespread in nuclear facilities, aerospace, radiation medicine and other fields, had a large energy, threated the health of humans. Traditional protective materials, such as lead-plates, glass, etc. had a higher mobility, bulky, and the shielding rate was low, could not satisfied the human’s needs, and therefore urgently needed a lightweight and efficient research and development with low toxicity γ-ray protective materials. Bismuth and tungsten were low toxicity, easy processing of heavy metals in radiation protection had a wide range of applications. Based on a single ray absorption of heavy elements had a weak area, This paper studied the nano-oxides and salts with natural rubber compound containing bismuth and tungsten two elements, prepared by excellent mechanical properties and γ-ray of the rubber matrix composites.Bi2O3 and WO3 nanoparticles were filled the into natural rubber(NR) with total mass fraction of 30% but with different ratios, then the NR/WO3/Bi2O3 composites were obtained. Bi2O3 and WO3 particles size attained to nanoscale, and the surface of particles was successfully grafted the organic active agent. The tensile strength of composites was more than double natural rubber without nanoparticles of 10.2MPa. The composites with the 15:15 mass ratio of Bi2O3 and WO3 had an outstanding γ-ray shielding property at 241 Am point source of 59.5ke V, which was enhanced from 8.3% of the 30:0 and 9.2% of 0:30 to 12%. Quantum effect and surface effects as well as a good dispersity for the nanoparticles in the NR were the key to synergistically improve the γ-ray shielding properties and the tensile strength of NR/WO3/Bi2O3 composites.Bi2WO6 nanoparticles were synthesized by hydrothermal method, Bi2O3 and WO3 nanoparticles with same size were prepared by mechanical milling, and filled into natural rubber(NR) with total mass fraction of 30%. Finally the NR/nanoparticles composites were obtained. The tensile strength of composites was more than double natural rubber without nanoparticles. The NR/Bi2WO6 had an outstanding γ-ray shielding property at 241 Am point source of 59.5ke V, which was 13.6%, surpass 7.4% of NR/WO3 and 9.2% of NR/Bi2O3 largely. Interlayer bond of Bi2WO6 nanoparticles and boundary complementary effect were the key to improve the γ-ray shielding properties and the tensile strength of NR /Bi2WO6 composites, compared with WO3 and Bi2O3.Four kinds of morphologies of Bi2WO6 flaky nanocrystals were synthesized by hydrothermal with different surfactants(citric acid, STAB, thiourea, and ethlendiamine). Futhermore, the rel ations between the morphologies and photoluminescence of Bi2WO6 flaky nanocrystals were also explored. The results indicated that the cationic surfactants(thiourea and ethlendiamine) were conducive to obtain the inerratic Bi2WO6 flaky nanocrystals, with large BET for the intensity increases in the photoluminescence. Conversely, the inerratic Bi2WO6 flaky nanocrystals were obtained with anionic surfactants(citric acid and STAB), which restrains the intensity of photoluminescence.Bi2WO6 nanosheets with different morphologies were synthesized by adjusting the ratios of CH3CH2 OH and H2 O under solvothermal method. Meanwhile, the effects of morphology on photoluminescence for Bi2WO6 nanosheets have been explored. The crystalline, edges, and interlayer spacings of Bi2WO6 nanosheets were first enhanced and then reduced with the increase in proportion of CH3CH2 OH in the solvent. When the ratio of CH3CH2 OH and H2 O was 1:1, the values of edges, interlayer spacings and specific surface areas for the Bi2WO6 nanosheets were attained maximum, which contributed to the excellent photoluminescence. However, when the ratio was more than 1:1, the values of edges, interlayer spacings and specific surface areas for Bi2WO6 nanosheets were reduced, which went against the improveme nt of photoluminescence. The results indicated that there was a synergistic effect of CH3CH2 OH and H2 O on the formation of morphology and the improvement of photoluminescence for Bi2WO6 nanosheets.With the deeply use in nuclear facilities of γ-ray, aerospace, radiation medicine and other fields, offer society convenience, and threated the health of humans. Traditional protective materials, such as lead-plates, glass, etc. had a higher mobility, bulky, and the shielding rate was low, could not satisfied the human’s needs, and therefore urgently needed a lightweight and efficient research and development with low toxicity γ-ray protective materials. Bismuth and tungsten were low toxicity, easy processing of heavy metals in radiation protection had a wide ran ge of applications. Based on a single ray absorption of heavy elements had a weak area, This paper studied the nano-oxides and salts with natural rubber compound containing bismuth and tungsten two elements, prepared by excellent mechanical properties and γ-ray of the rubber matrix composites.Uniform sheet-like BWO blocky form with excellent PL property were synthesized via a gel-flux route at a low temperature. With increasing fluxing temperature, the BWO crystal particle transformed from pure orthorhombi c Bi2WO6 to tetragonal Bi0.875W0.125O1.6875, and the crystallinity and BET values for BWO were first enhanced and then reduced. The pure tetragonal Bi0.875W0.125O1.6875 attained a maximum BET value and intensity crystallinity which was contributed to widen ed the emission peak, and enhanced the PL intensity. Nr/ BWO composite had an excellent γ-ray shielding, which was attained to 55.19%.