With the copper/iron cinder as the starting material,ferrous ions were obtained through maturing,acid leaching,reducing and purifying processes,and then iron nanoparticles were prepared by reacting with sodium borohyd...With the copper/iron cinder as the starting material,ferrous ions were obtained through maturing,acid leaching,reducing and purifying processes,and then iron nanoparticles were prepared by reacting with sodium borohydride in the system of ethanol-water.The nano Fe/SiO2 core-shell composite particles were synthesized by the hydrolysis of tetraethyl orthosilicate (TEOS).The products were characterized by X-ray diffraction (XRD),transmission electron microscope (TEM) and reflectance absorption infrared spectroscopy (RA-IR).The particles were randomly dispersed in paraffin at a mass ratio of 5.5∶4.5 for microwave electromagnetic parameters detection in the frequency range of 2.0—18.0 GHz by vector network analyzer.The results showed that there were two characteristic absorption peaks of Si—O and Si—O—Fe bond appearing at 1389 cm-1 and 878 cm-1,which indicated that the nano iron was successfully coated by SiO2.Through measuring and calculation,the minimal reflection loss was-39.0 dB at 17.2 GHz when the sample thickness was 4.5 mm.So nano Fe/SiO2 core-shell composite particles can be prepared from copper/iron cider to be used as an effective microwave absorbing material.展开更多
Nanofluids because of their surface characteristics improve the oil production from reservoirs by enabling different enhanced recovery mechanisms such as wettability alteration,interfacial tension(IFT)reduction,oil vi...Nanofluids because of their surface characteristics improve the oil production from reservoirs by enabling different enhanced recovery mechanisms such as wettability alteration,interfacial tension(IFT)reduction,oil viscosity reduction,formation and stabilization of colloidal systems and the decrease in the asphaltene precipitation.To the best of the authors’ knowledge,the synthesis of a new nanocomposite has been studied in this paper for the first time.It consists of nanoparticles of both SiO2 and Fe3O4.Each nanoparticle has its individual surface property and has its distinct effect on the oil production of reservoirs.According to the previous studies,Fe3O4 has been used in the prevention or reduction of asphaltene precipitation and SiO2 has been considered for wettability alteration and/or reducing IFTs in enhanced oil recovery.According to the experimental results,the novel synthesized nanoparticles have increased the oil recovery by the synergistic effects of the formed particles markedly by activating the various mechanisms relative to the use of each of the nanoparticles in the micromodel individually.According to the results obtained for the use of this nanocomposite,understanding reservoir conditions plays an important role in the ultimate goal of enhancing oil recovery and the formation of stable emulsions plays an important role in oil recovery using this method.展开更多
摘要With the copper/iron cinder as the starting material,ferrous ions were obtained through maturing,acid leaching,reducing and purifying processes,and then iron nanoparticles were prepared by reacting with sodium borohydride in the system of ethanol-water.The nano Fe/SiO2 core-shell composite particles were synthesized by the hydrolysis of tetraethyl orthosilicate (TEOS).The products were characterized by X-ray diffraction (XRD),transmission electron microscope (TEM) and reflectance absorption infrared spectroscopy (RA-IR).The particles were randomly dispersed in paraffin at a mass ratio of 5.5∶4.5 for microwave electromagnetic parameters detection in the frequency range of 2.0—18.0 GHz by vector network analyzer.The results showed that there were two characteristic absorption peaks of Si—O and Si—O—Fe bond appearing at 1389 cm-1 and 878 cm-1,which indicated that the nano iron was successfully coated by SiO2.Through measuring and calculation,the minimal reflection loss was-39.0 dB at 17.2 GHz when the sample thickness was 4.5 mm.So nano Fe/SiO2 core-shell composite particles can be prepared from copper/iron cider to be used as an effective microwave absorbing material.
摘要Nanofluids because of their surface characteristics improve the oil production from reservoirs by enabling different enhanced recovery mechanisms such as wettability alteration,interfacial tension(IFT)reduction,oil viscosity reduction,formation and stabilization of colloidal systems and the decrease in the asphaltene precipitation.To the best of the authors’ knowledge,the synthesis of a new nanocomposite has been studied in this paper for the first time.It consists of nanoparticles of both SiO2 and Fe3O4.Each nanoparticle has its individual surface property and has its distinct effect on the oil production of reservoirs.According to the previous studies,Fe3O4 has been used in the prevention or reduction of asphaltene precipitation and SiO2 has been considered for wettability alteration and/or reducing IFTs in enhanced oil recovery.According to the experimental results,the novel synthesized nanoparticles have increased the oil recovery by the synergistic effects of the formed particles markedly by activating the various mechanisms relative to the use of each of the nanoparticles in the micromodel individually.According to the results obtained for the use of this nanocomposite,understanding reservoir conditions plays an important role in the ultimate goal of enhancing oil recovery and the formation of stable emulsions plays an important role in oil recovery using this method.