A direct synthesis method is introduced to prepare nano-porous silicon-nickel nanocomposite (nPS/Ni) powder for thermal isolation applications. In this paper, we study the thermal stability of nanocomposites consistin...A direct synthesis method is introduced to prepare nano-porous silicon-nickel nanocomposite (nPS/Ni) powder for thermal isolation applications. In this paper, we study the thermal stability of nanocomposites consisting of nanoparticles metal incorporated into the pores of a porous silicon by a very simple method. The nickel element is chemically deposited whereas the nanoparticles are precipitated on the pore surfaces. The (nPS) and (nPS/Ni) nano-materials are thermally measured under nitrogen at temperatures of 40℃ - 1000℃, noticeable, demonstrating better thermal stability of (nPS/Ni) until 900℃ than in the case of (nPS) at 600℃. Then, the improving of the thermal stability of the nPS powder is facilitated using it in many applications of the thermal insulation process.展开更多
An innovative molecularly imprinted electrochemical sensor was fabricated based on reduced graphene oxide （RGO） and gold nanocomposite （Au） for rapid detection of vincristine （VCR）. The RGO-Au composite membrane...An innovative molecularly imprinted electrochemical sensor was fabricated based on reduced graphene oxide （RGO） and gold nanocomposite （Au） for rapid detection of vincristine （VCR）. The RGO-Au composite membrane was obtained via direct one-step electrodeposition technique of graphene oxide （GO） and chloroauric acid （HAuCl4） on the surface of a glassy carbon electrode （GCE） by means of cyclic voltammetry （CV） in the potential range be- tween -1.5 and 0.6 V in phosphate buffer solution （PBS） of pH 9.18, which is capable of effectively utilizing its superior electrical conductivity, larger specific surface area due to its synergistic effect between RGO and Au. The molecularly imprinted polymers （MIPs） were synthesized on the RGO-Au modified glassy carbon electrode surface with VCR as the template molecular, methyl acrylic acid （MAA） as the functional monomer, and ethylene glycol maleic rosinate acrylate （EGMRA） as a cross-linker. The performance of the sensor was investigated by cyclic voltammetry （CV）, differential pulse voltammetry （DPV） and electrochemical impedance spectroscopy （EIS） in de- tail. Under the optimum conditions, the fabricated sensor exhibited a linear relationship between oxidation peak current and VCR concentration over the range of 5.0×10 8 5.0×10^-6 mol.L l with a correlation coefficient of 0.9952 and a detection limit （S/N=3） of 2.6×10 8 mol.L^-1. The results indicated that the imprinted polymer films exhibited an excellent selectivity for VCR. The imprinted sensor was successfully used to determine VCR in real samples with recoveries of 90%-- 120% by using the standard addition method.展开更多
The efficient removal of phosphorous from water is an important but challenging task. In this study, we validated the applicability of a new commercially available nanocomposite adsorbent, i.e., a polymer-based hydrat...The efficient removal of phosphorous from water is an important but challenging task. In this study, we validated the applicability of a new commercially available nanocomposite adsorbent, i.e., a polymer-based hydrated ferric oxide nanocomposite （HFO-201）, for the further removal of phosphorous from the bioefftuent discharged from a municipal wastewater treatment plant, and the operating parameters such as the flow rate, temperature and composition of the regenerants were optimized. Labora- tory-scale results indicate that phosphorous in real bioeffluent can be effectively removed from 0.92 mg· L^-1 to 〈 0.5 mg· L^-1 （or even 〈 0.1 mg·L^-1 as desired） by the new adsorbent at a flow rate of 50 bed volume （BV） per hour and treatable volume of 3500-4000BV per run. Phosphorous removal is independent of the ambient temperature in the range of 15℃-40℃. Moreover, the exhausted HFO-201 can be regenerated by a 2% NaOH ＋ 5% NaC1 binary solution for repeated use without significant capacity loss. A scaled-up study further indicated that even though the initial total phosphorus （TP） was as high as 2 mg·L^-1, it could be reduced to 〈 0.5 mg·L^-1, with a working capacity of 4.4-4.8 g·L^-1 HFO- 201. In general, HFO-201 adsorption is a choice method for the efficient removal of phosphate from biotreated waste effluent.展开更多
PAA/Fe_(3)O_(4) nanocomposites were prepared by mixing nano-Fe_(3)O_(4) and polyacrylic acid(PAA)ethanol solution and then evaporating the solvent.The materials were characterized by transmission electron microscope(T...PAA/Fe_(3)O_(4) nanocomposites were prepared by mixing nano-Fe_(3)O_(4) and polyacrylic acid(PAA)ethanol solution and then evaporating the solvent.The materials were characterized by transmission electron microscope(TEM),Fourier transform infrared spectroscope(FTIR),thermogra-vimetry analysis(TGA),dynamic ultra-micro hardness tester(DUMHT)and superconducting quantum interference device(SQUID)magnetometer.Results showed that PAA coordi-nated with nano-Fe_(3)O_(4) to form a cross-linking structure.The presence of nano-Fe_(3)O_(4) enhanced the thermal stability of the nanocomposite.The elasticity and hardness of the nanocomposite increased,and the indentation depth reduced with the increase of Fe_(3)O_(4) content in the composites.The nanocomposites showed superparamagnetic properties at 300 K.展开更多
文摘A direct synthesis method is introduced to prepare nano-porous silicon-nickel nanocomposite (nPS/Ni) powder for thermal isolation applications. In this paper, we study the thermal stability of nanocomposites consisting of nanoparticles metal incorporated into the pores of a porous silicon by a very simple method. The nickel element is chemically deposited whereas the nanoparticles are precipitated on the pore surfaces. The (nPS) and (nPS/Ni) nano-materials are thermally measured under nitrogen at temperatures of 40℃ - 1000℃, noticeable, demonstrating better thermal stability of (nPS/Ni) until 900℃ than in the case of (nPS) at 600℃. Then, the improving of the thermal stability of the nPS powder is facilitated using it in many applications of the thermal insulation process.
文摘An innovative molecularly imprinted electrochemical sensor was fabricated based on reduced graphene oxide （RGO） and gold nanocomposite （Au） for rapid detection of vincristine （VCR）. The RGO-Au composite membrane was obtained via direct one-step electrodeposition technique of graphene oxide （GO） and chloroauric acid （HAuCl4） on the surface of a glassy carbon electrode （GCE） by means of cyclic voltammetry （CV） in the potential range be- tween -1.5 and 0.6 V in phosphate buffer solution （PBS） of pH 9.18, which is capable of effectively utilizing its superior electrical conductivity, larger specific surface area due to its synergistic effect between RGO and Au. The molecularly imprinted polymers （MIPs） were synthesized on the RGO-Au modified glassy carbon electrode surface with VCR as the template molecular, methyl acrylic acid （MAA） as the functional monomer, and ethylene glycol maleic rosinate acrylate （EGMRA） as a cross-linker. The performance of the sensor was investigated by cyclic voltammetry （CV）, differential pulse voltammetry （DPV） and electrochemical impedance spectroscopy （EIS） in de- tail. Under the optimum conditions, the fabricated sensor exhibited a linear relationship between oxidation peak current and VCR concentration over the range of 5.0×10 8 5.0×10^-6 mol.L l with a correlation coefficient of 0.9952 and a detection limit （S/N=3） of 2.6×10 8 mol.L^-1. The results indicated that the imprinted polymer films exhibited an excellent selectivity for VCR. The imprinted sensor was successfully used to determine VCR in real samples with recoveries of 90%-- 120% by using the standard addition method.
文摘The efficient removal of phosphorous from water is an important but challenging task. In this study, we validated the applicability of a new commercially available nanocomposite adsorbent, i.e., a polymer-based hydrated ferric oxide nanocomposite （HFO-201）, for the further removal of phosphorous from the bioefftuent discharged from a municipal wastewater treatment plant, and the operating parameters such as the flow rate, temperature and composition of the regenerants were optimized. Labora- tory-scale results indicate that phosphorous in real bioeffluent can be effectively removed from 0.92 mg· L^-1 to 〈 0.5 mg· L^-1 （or even 〈 0.1 mg·L^-1 as desired） by the new adsorbent at a flow rate of 50 bed volume （BV） per hour and treatable volume of 3500-4000BV per run. Phosphorous removal is independent of the ambient temperature in the range of 15℃-40℃. Moreover, the exhausted HFO-201 can be regenerated by a 2% NaOH ＋ 5% NaC1 binary solution for repeated use without significant capacity loss. A scaled-up study further indicated that even though the initial total phosphorus （TP） was as high as 2 mg·L^-1, it could be reduced to 〈 0.5 mg·L^-1, with a working capacity of 4.4-4.8 g·L^-1 HFO- 201. In general, HFO-201 adsorption is a choice method for the efficient removal of phosphate from biotreated waste effluent.
文摘PAA/Fe_(3)O_(4) nanocomposites were prepared by mixing nano-Fe_(3)O_(4) and polyacrylic acid(PAA)ethanol solution and then evaporating the solvent.The materials were characterized by transmission electron microscope(TEM),Fourier transform infrared spectroscope(FTIR),thermogra-vimetry analysis(TGA),dynamic ultra-micro hardness tester(DUMHT)and superconducting quantum interference device(SQUID)magnetometer.Results showed that PAA coordi-nated with nano-Fe_(3)O_(4) to form a cross-linking structure.The presence of nano-Fe_(3)O_(4) enhanced the thermal stability of the nanocomposite.The elasticity and hardness of the nanocomposite increased,and the indentation depth reduced with the increase of Fe_(3)O_(4) content in the composites.The nanocomposites showed superparamagnetic properties at 300 K.
