The LB films of two amphiphilic complexes, DODA/PW 9Mo 3O 40 and DODA/PW 6Mo 6O 40 , were prepared from 12 tungstomolybdophosphheteropolyacid with dimethyldioctadecylammonium and their properties and the structure wer...The LB films of two amphiphilic complexes, DODA/PW 9Mo 3O 40 and DODA/PW 6Mo 6O 40 , were prepared from 12 tungstomolybdophosphheteropolyacid with dimethyldioctadecylammonium and their properties and the structure were characterized by UV Vis absorption spectra, fluorescence spectra, low angle X ray diffraction(LAXD) and π A isotherms curves. The results showed that the molecular areas for each comlex are 0.56 nm 2, and all of them could form an idealized structure with a stability of the Langmuir Blodgetl films.展开更多
以十八叔胺与1,6-二溴正己烷为原料合成了双子表面活性剂N,N'-双(十八烷基二甲基)-1,2-二溴化己二铵盐(C18-6-C18·2Br-)。产物经红外光谱(IR)、核磁共振氢谱(1HNMR)和元素分析进行了确证。通过表面张力法测定了C18-6-C18·...以十八叔胺与1,6-二溴正己烷为原料合成了双子表面活性剂N,N'-双(十八烷基二甲基)-1,2-二溴化己二铵盐(C18-6-C18·2Br-)。产物经红外光谱(IR)、核磁共振氢谱(1HNMR)和元素分析进行了确证。通过表面张力法测定了C18-6-C18·2Br-和十八烷基三甲基氯化铵(1831)的临界胶束浓度,测试结果表明:C18-6-C18·2Br-具有较高的表面活性,其临界胶束浓度为2.13×10-5mol/L,γCMC为39.1 m N/m,C18-6-C18·2Br-的临界胶束浓度较1831低一个数量级。对C18-6-C18·2Br-和水杨酸钠、氯化钾组成的清洁压裂液体系进行了性能研究。结果表明:双子表面活性剂在较低浓度时可形成稳定耐高温的胶束,具有良好的耐剪切能力,在110℃、170 s-1下连续剪切60min,表观黏度依然保持在60 m Pa·s左右;破胶性能良好,压裂液遇到煤油和盐水后可迅速破胶,残渣几乎为零,可较大程度地减小对地层的伤害;岩心伤害实验说明该压裂液体系对地层的伤害较小。说明该压裂液是一种耐温性能良好、黏弹性较好的低伤害压裂液。展开更多
A multicomposite P 2Mo 18 /DODA self assembled multilayer film was fabricated by casting the chloroform solutions of ionic complex between a dimethyldidecylammomium and a phosphomolybdate anion onto the borosilicate g...A multicomposite P 2Mo 18 /DODA self assembled multilayer film was fabricated by casting the chloroform solutions of ionic complex between a dimethyldidecylammomium and a phosphomolybdate anion onto the borosilicate glass and calcium fluoride substrates. Infrared spectra revealed that the Dawson strcucture characteristic of the P 2Mo 18 O 6- 62 anion was presented in the composite film. A well ordered superlattice structure, d spacing 3.59 nm, was identified by X ray diffraction. The composite film shows good photochromic properties. Under the irradiation with UV light, the transparent film changed from yellow to blue. Then, bleaching occurred when the film was in contact with ambient air or O 2 in the dark. If the UV irradiated films were stored in nitrogen, helium, argon or vacuum conditions, it could retain blue coloration for a long time. It suggests that oxygen plays an important role during the bleaching process. The photochromic mechanism of the composite film was studied by UV Vis spectra, FTIR spectra and ESR. The appearance of IVCT bands shows that electron transfer occurs between the organic substrate and heteropolyanion, converting heteropolyanions to heteropolyblues with simultaneous oxidation of the organic substrate. Observation of UV induced ESR signal suggests that electron transfer takes place in the lattice and P 2Mo 18 O 6- 62 acting as an acceptor gets electrons during UV irradiation. The changes of IR spectra for the composite film after UV irradiation are another powerful proof to identify the DODA was oxidized and P 2Mo 18 O 6- 62 was reduced in the photochronic process.展开更多
文摘The LB films of two amphiphilic complexes, DODA/PW 9Mo 3O 40 and DODA/PW 6Mo 6O 40 , were prepared from 12 tungstomolybdophosphheteropolyacid with dimethyldioctadecylammonium and their properties and the structure were characterized by UV Vis absorption spectra, fluorescence spectra, low angle X ray diffraction(LAXD) and π A isotherms curves. The results showed that the molecular areas for each comlex are 0.56 nm 2, and all of them could form an idealized structure with a stability of the Langmuir Blodgetl films.
文摘以十八叔胺与1,6-二溴正己烷为原料合成了双子表面活性剂N,N'-双(十八烷基二甲基)-1,2-二溴化己二铵盐(C18-6-C18·2Br-)。产物经红外光谱(IR)、核磁共振氢谱(1HNMR)和元素分析进行了确证。通过表面张力法测定了C18-6-C18·2Br-和十八烷基三甲基氯化铵(1831)的临界胶束浓度,测试结果表明:C18-6-C18·2Br-具有较高的表面活性,其临界胶束浓度为2.13×10-5mol/L,γCMC为39.1 m N/m,C18-6-C18·2Br-的临界胶束浓度较1831低一个数量级。对C18-6-C18·2Br-和水杨酸钠、氯化钾组成的清洁压裂液体系进行了性能研究。结果表明:双子表面活性剂在较低浓度时可形成稳定耐高温的胶束,具有良好的耐剪切能力,在110℃、170 s-1下连续剪切60min,表观黏度依然保持在60 m Pa·s左右;破胶性能良好,压裂液遇到煤油和盐水后可迅速破胶,残渣几乎为零,可较大程度地减小对地层的伤害;岩心伤害实验说明该压裂液体系对地层的伤害较小。说明该压裂液是一种耐温性能良好、黏弹性较好的低伤害压裂液。
文摘A multicomposite P 2Mo 18 /DODA self assembled multilayer film was fabricated by casting the chloroform solutions of ionic complex between a dimethyldidecylammomium and a phosphomolybdate anion onto the borosilicate glass and calcium fluoride substrates. Infrared spectra revealed that the Dawson strcucture characteristic of the P 2Mo 18 O 6- 62 anion was presented in the composite film. A well ordered superlattice structure, d spacing 3.59 nm, was identified by X ray diffraction. The composite film shows good photochromic properties. Under the irradiation with UV light, the transparent film changed from yellow to blue. Then, bleaching occurred when the film was in contact with ambient air or O 2 in the dark. If the UV irradiated films were stored in nitrogen, helium, argon or vacuum conditions, it could retain blue coloration for a long time. It suggests that oxygen plays an important role during the bleaching process. The photochromic mechanism of the composite film was studied by UV Vis spectra, FTIR spectra and ESR. The appearance of IVCT bands shows that electron transfer occurs between the organic substrate and heteropolyanion, converting heteropolyanions to heteropolyblues with simultaneous oxidation of the organic substrate. Observation of UV induced ESR signal suggests that electron transfer takes place in the lattice and P 2Mo 18 O 6- 62 acting as an acceptor gets electrons during UV irradiation. The changes of IR spectra for the composite film after UV irradiation are another powerful proof to identify the DODA was oxidized and P 2Mo 18 O 6- 62 was reduced in the photochronic process.
