Chitosan(CTS)was grafted onto the surface of amino‑functionalized silver chloride silicon dioxide(AgCl@SiO_(2)‑NH_(2))cores to obtain AgCl@SiO_(2)/CTS hybrid nanoparticles.The as‑obtained AgCl@SiO_(2)/CTS nanoparticle...Chitosan(CTS)was grafted onto the surface of amino‑functionalized silver chloride silicon dioxide(AgCl@SiO_(2)‑NH_(2))cores to obtain AgCl@SiO_(2)/CTS hybrid nanoparticles.The as‑obtained AgCl@SiO_(2)/CTS nanoparticles were chlorinated by NaClO solution to get AgCl@SiO_(2)/CTS‑based chloramine nano‑hybrid materials,denoted as AgCl@SiO_(2)/CTS‑Cl.A transmission electron microscope was used to observe the morphology of the as‑prepared samples AgCl@SiO_(2)/CTS and AgCl@SiO_(2)/CTS‑Cl.At the same time,an X‑ray diffractometer and an infrared spectroscope were utilized to characterize their crystal and chemical structures.Besides,ζpotentials were measured to elucidate the surface modification of AgCl nanoparticles by—NH_(2),the antibacterial mechanism of AgCl@SiO_(2)/CTS‑Cl was investigated by scanning electron microscopy,and Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)were used as the to‑be‑tested strains to evaluate the antimicrobial activity of samples AgCl@SiO_(2)/CTS and AgCl@SiO_(2)/CTS‑Cl.Findings demonstrate that sample AgCl@SiO_(2)/CTS exhibits a chain‑like structure ascribed to the interaction between—NH_(2),and each AgCl@SiO_(2)/CTS hybrid nanoparticle contains several AgCl cores.In the meantime,sample AgCl@SiO_(2)/CTS‑Cl exhibits excellent antibacterial activity against E.coli and S.aureus,which is attributed to the synergistic antibacterial effect of Ag^(+)and Cl^(-).Sample AgCl@SiO_(2)/CTS‑Cl with a dosage of 640.00μg·mL^(-1) could completely kill the two kinds of tested bacteria in 12 h of incubation;it retains a high antibacterial efficiency even after 10 cycles of antibacterial tests.展开更多
随着武器装备技术的不断进步,装甲结构的轻质化与抗侵彻能力日益成为研究的重点。在等面密度和总厚度不变条件下,对不同厚度配比的铝合金/UHMWPE复合装甲板抗侵彻性能进行了仿真分析,以复合板结构面密度吸能作为抗侵彻性能指标,深入研...随着武器装备技术的不断进步,装甲结构的轻质化与抗侵彻能力日益成为研究的重点。在等面密度和总厚度不变条件下,对不同厚度配比的铝合金/UHMWPE复合装甲板抗侵彻性能进行了仿真分析,以复合板结构面密度吸能作为抗侵彻性能指标,深入研究了复合装甲板结构轻量化与防护性能之间的平衡关系。研究结果表明:在等面密度条件下,复合板的面密度吸能随着UHMWPE层合板厚度的增加呈现先快速提升后逐渐趋于平缓的趋势,通过综合考虑复合板结构总厚度影响,确定6 mm Al/10.8 mm UHMWPE复合结构抗侵彻性最优;对于具有相同厚度的复合板,当铝合金与UHMWPE的厚度配比为1∶4时,其面密度吸能达到最大值,为92.9 J/(kg·m^(2))。研究结果可为复合装甲结构的厚度匹配优化设计提供参考。展开更多
文摘Chitosan(CTS)was grafted onto the surface of amino‑functionalized silver chloride silicon dioxide(AgCl@SiO_(2)‑NH_(2))cores to obtain AgCl@SiO_(2)/CTS hybrid nanoparticles.The as‑obtained AgCl@SiO_(2)/CTS nanoparticles were chlorinated by NaClO solution to get AgCl@SiO_(2)/CTS‑based chloramine nano‑hybrid materials,denoted as AgCl@SiO_(2)/CTS‑Cl.A transmission electron microscope was used to observe the morphology of the as‑prepared samples AgCl@SiO_(2)/CTS and AgCl@SiO_(2)/CTS‑Cl.At the same time,an X‑ray diffractometer and an infrared spectroscope were utilized to characterize their crystal and chemical structures.Besides,ζpotentials were measured to elucidate the surface modification of AgCl nanoparticles by—NH_(2),the antibacterial mechanism of AgCl@SiO_(2)/CTS‑Cl was investigated by scanning electron microscopy,and Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)were used as the to‑be‑tested strains to evaluate the antimicrobial activity of samples AgCl@SiO_(2)/CTS and AgCl@SiO_(2)/CTS‑Cl.Findings demonstrate that sample AgCl@SiO_(2)/CTS exhibits a chain‑like structure ascribed to the interaction between—NH_(2),and each AgCl@SiO_(2)/CTS hybrid nanoparticle contains several AgCl cores.In the meantime,sample AgCl@SiO_(2)/CTS‑Cl exhibits excellent antibacterial activity against E.coli and S.aureus,which is attributed to the synergistic antibacterial effect of Ag^(+)and Cl^(-).Sample AgCl@SiO_(2)/CTS‑Cl with a dosage of 640.00μg·mL^(-1) could completely kill the two kinds of tested bacteria in 12 h of incubation;it retains a high antibacterial efficiency even after 10 cycles of antibacterial tests.
文摘随着武器装备技术的不断进步,装甲结构的轻质化与抗侵彻能力日益成为研究的重点。在等面密度和总厚度不变条件下,对不同厚度配比的铝合金/UHMWPE复合装甲板抗侵彻性能进行了仿真分析,以复合板结构面密度吸能作为抗侵彻性能指标,深入研究了复合装甲板结构轻量化与防护性能之间的平衡关系。研究结果表明:在等面密度条件下,复合板的面密度吸能随着UHMWPE层合板厚度的增加呈现先快速提升后逐渐趋于平缓的趋势,通过综合考虑复合板结构总厚度影响,确定6 mm Al/10.8 mm UHMWPE复合结构抗侵彻性最优;对于具有相同厚度的复合板,当铝合金与UHMWPE的厚度配比为1∶4时,其面密度吸能达到最大值,为92.9 J/(kg·m^(2))。研究结果可为复合装甲结构的厚度匹配优化设计提供参考。
