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Different morphologies of β-FeOOH were prepared by hydrothermal synthesis using NaH2PO4 as structural modifier. The rod-shaped, straw-like and flower-like products could be controllably obtained. The as-obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Ultraviolet-visible (UV-Vis) absorption spectroscopy. The experimental results show that the morphology manipulation could be achieved by adding different amounts of NaH2PO4. XRD pattern indicates that the as-prepared sample is the pure tetragonal phase of β-FeOOH. UV-Vis absorption spectra of the products are affected by their morphologies, which shows that both the rod-shaped and straw-like β-FeOOH have outstanding absorption ability on the whole UV area (200-400 nm), which will have vast application prospects in UV protection. 相似文献
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Ca-Fe-Ce基硝酸盐阻燃抑烟型阻燃剂的制备与性能表征 总被引:1,自引:0,他引:1
以CaO, Fe(NO3)3×9H2O和Ce(NO3)3×6H2O为原料,采用机械化学法制备了钙铁层状金属氢氧化物和钙铁铈层状金属氢氧化物. 以XRD和热重分析表征了产物的结晶结构及热分解行为,结合ICP光谱测定,推测产物的化学组成分别为Ca0.51Fe0.49(OH)2(NO3)0.49×0.69H2O和Ca0.51Fe 0.37Ce 0.12(OH)2(NO3)0.49×0.59H2O. 将上述产物作为功能填料加入室温硫化硅橡胶,其添加量为0.7 g/g时,复合材料的拉伸强度达到4.5 MPa,氧指数约为34.5%,具有良好的阻燃性能和力学性能,优于常规的Mg(OH)2和镁铝层状金属氢氧化物. 含有0.2 g/g钙铁铈层状金属氢氧化物的室温硫化硅橡胶复合材料最大烟密度为8.46,抑烟性能优异. 相似文献
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采用磷酸二氢钠作为形貌调控剂通过水热合成制备了β-纳米羟基氧化铁并对其进行了分析表证。紫外吸收可见光谱表明β-纳米羟基氧化铁可以吸收98%的紫外光在整个紫外区域(200~400 nm),具有潜在的紫外防护应用前景。β-纳米羟基氧化铁/室温硫化硅橡胶纳米复合材料通过原位聚合的方式制得,紫外光谱表明随β-纳米羟基氧化铁的加入,复合材料的紫外吸收能力显著提高,当加入0.05 wt%的β-纳米羟基氧化铁时,复合材料在240~400 nm紫外区域的吸收值由62%提高到了98%,表明复合材料有望应用于高效紫外屏蔽。 相似文献
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