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高分子材料论文翻译求助
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The nanocomposite multilayer film was prepared using sol–gel method. The TiO2and ferrite sols were synthe-sized respectively first. The TiO2sol was obtained after adding tetrabutyl titanate, diethanolanine and a little of watertotheabsolutealcohol,withstirringfortwohours. According to the composition of BaFe10.5Al1.5O19, BaFe10.1Al1.9O19 and BaFe11.4Cr0.6O19 respectively, stoichiometric amount of barium nitrate, ferric nitrate, aluminum nitrate or chromium nitrate were dissolved in 60?C ethylene glycol with the addition of citric acid. After the ethylene diamine was added to adjust the pH value to 7.0, the ferrites precursor sols were formed. Depending on the weight ratio of ferrite to titanium dioxide for 3:5, three mixed sols were prepared. The mixed sol of BaFe10.1Al1.9O19and TiO2 was first spin coated onto a quartz glass plate, which had been previously cleaned by deionized water and alcohol. The spin speed was 3,000 rpm and the spin time was 15 s. The composite film was dried at 60 ?C for 30 min. Then the above spin process was repeated successively with the other two mixed sols containing BaFe10.5Al1.5O19and BaFe11.4Cr0.6O19. Finally, three layer composite films were calcined at 850 ?C for one hour. Surface morphology of the multilayer film was analyzed with atomic force microscopy (AFM), which was performed on the UHV-SPM. The scanning area was 2 ·2 lm. The crystalline structures of multilayer film were determined with X-ray diffraction (XRD) carried out on a Bruker-AXS D8 Advanced diffrac-tometer with Cu Karadiation in the 2h range from 10? to 90?, by steps of 0.02?. The microwave absorption property was expressed in microwave loss efficiency. The composite film was scraped off the quartz glass and collected together. The powders were filled into a 30 · 30 · 3 mm polytetrafluoroethylene box and pressed tightly. The transmission and reflection coef-ficients were measured with microstrip transmission line in 8722ES vector network analyzer in the fre-quency range from 5 GHz to 15 GHz. The microwave loss AdBwas calculated according to Eq. 1 where PTis the transmission wave power; PIis the incident wave power and PR is the reflection wave power. The microwave loss of the polytetrafluoroeth- ylene box was subtracted. |
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| 用溶胶——凝胶方法制备纳米复合材料多层膜。首先分别合成TiO2和陶铁磁体溶胶。加入钛酸四丁酯、diethanolanine和少量的watertotheabsolutealcohol并搅拌2小时后得到TiO2溶胶。分别根据BaFe10.5Al1.5O19, BaFe10.1Al1.9O19和BaFe11.4Cr0.6O19的复合物，化学计量的硝酸钡、硝酸铁、硝酸铝或硝酸铬溶于60℃乙烯乙二醇的柠檬酸溶液中。用乙二胺调节PH至7.0后，铁酸盐的前提溶胶形成。根据铁酸盐与二氧化钛的重量比为3:5，制备三分混合溶胶。BaFe10.1Al1.9O19与 TiO2的混合溶胶首先旋转涂于事先被去离子水和无水乙醇清洗的石英玻璃盘子上。旋转速度为3000 rpm/s，算转时间为15s。复合膜60℃干燥30min。其他两种含有BaFe10.5Al1.5O19和BaFe11.4Cr0.6O19的混和溶胶采用上述相同的旋转过程连续涂于其上。最后这三层复合膜于850℃焙烤1小时。使用原子力显微镜分析该多层膜的表面形态，扫描范围是2*2 lm。用X-射线衍射仪测定多层膜的晶体结构，（carried out on a Bruker-AXS D8 Advanced diffractometer with Cu Karadiation in the 2h range from 10? to 90?, by steps of 0.02?——这些是X-射线衍射仪的测定条件与关键设备部件的型号）。用微波损失率表达微波吸收性能。将复合膜从石英玻璃上刮下来，并收集，将这些粉末至于30*30*3 mm聚四氟乙烯盒子内，压实。用频率范围为5-15 GHz 的8722ES矢量网络分析仪中的微波传送带传递线测定传递和反射系数。根据Eq. 1计算微波损失AdBwas，PTis是传递波能；PIis是入射波能；PR是反射波能。减去聚四氟乙烯盒子的微波损失。 |
2楼2014-04-09 16:03:52