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[求助]
高分子材料論文翻譯求助
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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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| 用溶膠——凝膠方法制備納米復(fù)合材料多層膜。首先分別合成TiO2和陶鐵磁體溶膠。加入鈦酸四丁酯、diethanolanine和少量的watertotheabsolutealcohol并攪拌2小時(shí)后得到TiO2溶膠。分別根據(jù)BaFe10.5Al1.5O19, BaFe10.1Al1.9O19和BaFe11.4Cr0.6O19的復(fù)合物，化學(xué)計(jì)量的硝酸鋇、硝酸鐵、硝酸鋁或硝酸鉻溶于60℃乙烯乙二醇的檸檬酸溶液中。用乙二胺調(diào)節(jié)PH至7.0后，鐵酸鹽的前提溶膠形成。根據(jù)鐵酸鹽與二氧化鈦的重量比為3:5，制備三分混合溶膠。BaFe10.1Al1.9O19與 TiO2的混合溶膠首先旋轉(zhuǎn)涂于事先被去離子水和無(wú)水乙醇清洗的石英玻璃盤子上。旋轉(zhuǎn)速度為3000 rpm/s，算轉(zhuǎn)時(shí)間為15s。復(fù)合膜60℃干燥30min。其他兩種含有BaFe10.5Al1.5O19和BaFe11.4Cr0.6O19的混和溶膠采用上述相同的旋轉(zhuǎn)過(guò)程連續(xù)涂于其上。最后這三層復(fù)合膜于850℃焙烤1小時(shí)。使用原子力顯微鏡分析該多層膜的表面形態(tài)，掃描范圍是2*2 lm。用X-射線衍射儀測(cè)定多層膜的晶體結(jié)構(gòu)，（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?——這些是X-射線衍射儀的測(cè)定條件與關(guān)鍵設(shè)備部件的型號(hào)）。用微波損失率表達(dá)微波吸收性能。將復(fù)合膜從石英玻璃上刮下來(lái)，并收集，將這些粉末至于30*30*3 mm聚四氟乙烯盒子內(nèi)，壓實(shí)。用頻率范圍為5-15 GHz 的8722ES矢量網(wǎng)絡(luò)分析儀中的微波傳送帶傳遞線測(cè)定傳遞和反射系數(shù)。根據(jù)Eq. 1計(jì)算微波損失AdBwas，PTis是傳遞波能；PIis是入射波能；PR是反射波能。減去聚四氟乙烯盒子的微波損失。 |
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