Thein situ low angle X-ray diffraction and transmission electron microscopy were used to monitor the interdiffusion characteristics as well as the microstructure in Ag/Si multilayers with modulated wavelength 7. 64 nm...Thein situ low angle X-ray diffraction and transmission electron microscopy were used to monitor the interdiffusion characteristics as well as the microstructure in Ag/Si multilayers with modulated wavelength 7. 64 nm when annealing from 323 to 573 K. The interdiffusion mechanism of Ag/Si multilayers with immiscibility is different from that of other metal/Si multilayers which are miscible. Phase separation takes place at 323 K, then silicon atoms diffuse into silver sublayers through silver grain boundaries and separate silver sublayers into nanometer sized silver particles gradually at higher temperature. The mean size of silver particles is about 5 nm. The activation energy and frequency factor are determined to be 0.24 eV and 2.02 x?20m2/s, respectively.展开更多
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
The amphiphilic porphyrin, 5, 10, 15, 20-tetra-(4-hexadecylpyridiniumyl) porphyrin bromide (TC 16PyP), has good film-forming property on the air/water interface. The structure of TC 16PyP Langmuir-Blodgett films was c...The amphiphilic porphyrin, 5, 10, 15, 20-tetra-(4-hexadecylpyridiniumyl) porphyrin bromide (TC 16PyP), has good film-forming property on the air/water interface. The structure of TC 16PyP Langmuir-Blodgett films was characterized by UV-Vis absorption spectra, fluorescence spectra and low-angle X-ray diffraction (LAXD). It is indicated that TC 16PyP LB films have good stability and structure homogeneity. The photoelectric behavior of electrochemical cell of TC 16PyP LB films deposited on SnO 2 optically transparent electrodes (SnO 2 OTE) were investigated by using the system of bicell and bielectrode. The experimental results show that the photocell can generate large and stable photocurrent and photovoltage, the photoelectric device made from TC 16PyP LB films has a potential application value.展开更多
The laser surface remelting (LSR) treatment was performed to Al-2.0 wt% Fe alloy with a 2 kW Yb-fiber laser (IPG YLR-2000S). The substrate and laser-treated material characterization were executed using different tech...The laser surface remelting (LSR) treatment was performed to Al-2.0 wt% Fe alloy with a 2 kW Yb-fiber laser (IPG YLR-2000S). The substrate and laser-treated material characterization were executed using different techniques. Among them, the microstructure was analyzed by optical microscope, SEM, low-angle X-ray diffraction (LAXRD) and the corrosion test was made in aerated solution of 0.1 M H2SO4 at a temperature of 25°C ± 0.5°C. As result was shown, the micrograph of LSR-treated material displaying can be a fine cellular structure and the existence of certain nano-porosities and a similar to a nano-dendritic growth was observed too. The characteristic of melted zone was constituted of metastable phases according to the result of x-rays and the behavior corrosion as a result of the LSR-treated sample, which it was shown to be more resistant to corrosion than the untreated sample. A comparative study was carried out of the cyclic polarization of the laser-treated and untreated samples, demonstrating that the reduction and oxidation reverse peaks were not observed and being the cyclic polarization behavior was of irreversible character in both samples, however, the LSR-treated sample propitious the passivity on the surface also reduced the corrosion phenomena. Wherefore, this type of laser-treated alloy can be applied in the aerospace, aeronautic and automobilist industries.展开更多
Amphiphilic complexes of N-octadecyl-8-hydroxy-2-quinoline carboxamide, M (OQ)(2), form stable monolayer on pure water subphase and can be easily fabricated as highly ordered and uniform LB films, which were character...Amphiphilic complexes of N-octadecyl-8-hydroxy-2-quinoline carboxamide, M (OQ)(2), form stable monolayer on pure water subphase and can be easily fabricated as highly ordered and uniform LB films, which were characterized by absorption spectra and low-angle X-ray diffraction measurements.展开更多
Using n [TC 16 PyP(4)]/ n (anthraquinone)(1∶1) mixture as film forming material, the film forming property of TC 16 PyP(4)/AnQ mixture on the air/water interface was studied. The structure of mixed TC 16 PyP(4)/AnQ L...Using n [TC 16 PyP(4)]/ n (anthraquinone)(1∶1) mixture as film forming material, the film forming property of TC 16 PyP(4)/AnQ mixture on the air/water interface was studied. The structure of mixed TC 16 PyP(4)/AnQ LB films was characterized by π A isotherms, UV Vis absorption spectra and low angle X ray diffraction(LAXD). The experimental results indicate that the TC 16 PyP(4)/AnQ mixture can form a stable monolayer on the air/water interface. Most AnQ molecules are incorporated into the cavities between the long alkyl chains of TC 16 PyP(4) molecules in the mixed monolayer and LB films. Mixed TC 16 PyP(4)/AnQ monolayer can be transferred to the substrates. TC 16 PyP(4)/AnQ LB films have a good stability and periodicity. [WT5HZ]展开更多
文摘Thein situ low angle X-ray diffraction and transmission electron microscopy were used to monitor the interdiffusion characteristics as well as the microstructure in Ag/Si multilayers with modulated wavelength 7. 64 nm when annealing from 323 to 573 K. The interdiffusion mechanism of Ag/Si multilayers with immiscibility is different from that of other metal/Si multilayers which are miscible. Phase separation takes place at 323 K, then silicon atoms diffuse into silver sublayers through silver grain boundaries and separate silver sublayers into nanometer sized silver particles gradually at higher temperature. The mean size of silver particles is about 5 nm. The activation energy and frequency factor are determined to be 0.24 eV and 2.02 x?20m2/s, respectively.
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The amphiphilic porphyrin, 5, 10, 15, 20-tetra-(4-hexadecylpyridiniumyl) porphyrin bromide (TC 16PyP), has good film-forming property on the air/water interface. The structure of TC 16PyP Langmuir-Blodgett films was characterized by UV-Vis absorption spectra, fluorescence spectra and low-angle X-ray diffraction (LAXD). It is indicated that TC 16PyP LB films have good stability and structure homogeneity. The photoelectric behavior of electrochemical cell of TC 16PyP LB films deposited on SnO 2 optically transparent electrodes (SnO 2 OTE) were investigated by using the system of bicell and bielectrode. The experimental results show that the photocell can generate large and stable photocurrent and photovoltage, the photoelectric device made from TC 16PyP LB films has a potential application value.
文摘The laser surface remelting (LSR) treatment was performed to Al-2.0 wt% Fe alloy with a 2 kW Yb-fiber laser (IPG YLR-2000S). The substrate and laser-treated material characterization were executed using different techniques. Among them, the microstructure was analyzed by optical microscope, SEM, low-angle X-ray diffraction (LAXRD) and the corrosion test was made in aerated solution of 0.1 M H2SO4 at a temperature of 25°C ± 0.5°C. As result was shown, the micrograph of LSR-treated material displaying can be a fine cellular structure and the existence of certain nano-porosities and a similar to a nano-dendritic growth was observed too. The characteristic of melted zone was constituted of metastable phases according to the result of x-rays and the behavior corrosion as a result of the LSR-treated sample, which it was shown to be more resistant to corrosion than the untreated sample. A comparative study was carried out of the cyclic polarization of the laser-treated and untreated samples, demonstrating that the reduction and oxidation reverse peaks were not observed and being the cyclic polarization behavior was of irreversible character in both samples, however, the LSR-treated sample propitious the passivity on the surface also reduced the corrosion phenomena. Wherefore, this type of laser-treated alloy can be applied in the aerospace, aeronautic and automobilist industries.
文摘Amphiphilic complexes of N-octadecyl-8-hydroxy-2-quinoline carboxamide, M (OQ)(2), form stable monolayer on pure water subphase and can be easily fabricated as highly ordered and uniform LB films, which were characterized by absorption spectra and low-angle X-ray diffraction measurements.
文摘Using n [TC 16 PyP(4)]/ n (anthraquinone)(1∶1) mixture as film forming material, the film forming property of TC 16 PyP(4)/AnQ mixture on the air/water interface was studied. The structure of mixed TC 16 PyP(4)/AnQ LB films was characterized by π A isotherms, UV Vis absorption spectra and low angle X ray diffraction(LAXD). The experimental results indicate that the TC 16 PyP(4)/AnQ mixture can form a stable monolayer on the air/water interface. Most AnQ molecules are incorporated into the cavities between the long alkyl chains of TC 16 PyP(4) molecules in the mixed monolayer and LB films. Mixed TC 16 PyP(4)/AnQ monolayer can be transferred to the substrates. TC 16 PyP(4)/AnQ LB films have a good stability and periodicity. [WT5HZ]
