目的：建立微波消解电感耦合等离子体质谱测定人血白蛋白中痕量元素的方法。方法：人血白蛋白经过微波消解,并对电感耦合等离子体质谱仪器工作参数进行优化,采用标准模式和动能歧视模式同时对Cr、Mn、Fe、Co、Ni、Cu、Zn、Ag、Cd、Sb、C...目的：建立微波消解电感耦合等离子体质谱测定人血白蛋白中痕量元素的方法。方法：人血白蛋白经过微波消解,并对电感耦合等离子体质谱仪器工作参数进行优化,采用标准模式和动能歧视模式同时对Cr、Mn、Fe、Co、Ni、Cu、Zn、Ag、Cd、Sb、Cs、Ba、Tl、Pb 14种元素进行检测,RF功率1.4 k W,载气流速1.07 m L·min-1,辅助气流速1.20 m L·min-1,同心雾化器,蠕动泵转速40 r·min-1。采用混合内标（74Ge、103Rh、115In、175Lu、209Bi）进行校正。结果：痕量元素的检测限为0.01-0.21μg·L-1,方法精密度为0.1%-5.5%,准确度为81.9%-116.8%,回收率为96.0%-113.0%。用该方法对国家标准物质头发成分GBW07601（GSH-1）进行分析测定,各微量元素测定值在标准值的范围内。结论：本方法适用于人血白蛋白中痕量元素的测定。展开更多
A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder （CoWO4/WO3） wa...A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder （CoWO4/WO3） was first formed by a spray-pyrolysis technique, which was then mixed with carbon black and converted to WC-Co composite powder at 950℃ for 4 h in N2 atmosphere. The resulting powder has a particle size of 100-300 nm.展开更多
An efficient method was proposed to prepare high-performance conductive AramidCarbon Blend Fabrics(ACBF)with cobalt-nickel(Co-Ni)alloy coatings,which is conducive to industrial production.The grid-like substrate compo...An efficient method was proposed to prepare high-performance conductive AramidCarbon Blend Fabrics(ACBF)with cobalt-nickel(Co-Ni)alloy coatings,which is conducive to industrial production.The grid-like substrate composed of aramid and carbon fibers was innovatively used in flexible Electromagnetic Interference(EMI)shielding materials.The natural network structure is advantageous to the uniform deposition of metal particles to the establishment of conductive pathways subsequently in order to improve conductivity.The induction of a synergistic effect from Electromagnetic(EM)wave-reflection and EM wave-absorption through the whole carbonCo-Ni-ternary system notably enhanced the EMI Shielding Effectiveness(SE)value to an average of 42.57 d B in the range of 30-6000 MHz.On the other hand,together with the inherent toughness of the alloy coatings,the tensile strength of the aramid fibers used for bulletproof made a significant contribution to the desired mechanical properties.The light weight of the resultant composite made it applicable to aerospace vehicles simultaneously.X-ray Photoelectron Spectroscopy(XPS)was conducted to investigate the variations of elements and groups on the sample surface in pretreating process.The elemental components and surface morphologies of fabric samples during different stages of the process were investigated by Scanning Electron Microscope(SEM)and Energy Dispersive spectrometer(EDX)measurements.X-Ray Diffraction(XRD)results indicated that the obtained Co-Ni alloy coating had a combined Hexagonal Closed-Packed(HCP)and FacedCentered Cubic(FCC)crystalline phase.The relatively high corrosion resistance demonstrated in different acid and alkaline conditions was instrumental in more complex environments as well.展开更多
文摘目的：建立微波消解电感耦合等离子体质谱测定人血白蛋白中痕量元素的方法。方法：人血白蛋白经过微波消解,并对电感耦合等离子体质谱仪器工作参数进行优化,采用标准模式和动能歧视模式同时对Cr、Mn、Fe、Co、Ni、Cu、Zn、Ag、Cd、Sb、Cs、Ba、Tl、Pb 14种元素进行检测,RF功率1.4 k W,载气流速1.07 m L·min-1,辅助气流速1.20 m L·min-1,同心雾化器,蠕动泵转速40 r·min-1。采用混合内标（74Ge、103Rh、115In、175Lu、209Bi）进行校正。结果：痕量元素的检测限为0.01-0.21μg·L-1,方法精密度为0.1%-5.5%,准确度为81.9%-116.8%,回收率为96.0%-113.0%。用该方法对国家标准物质头发成分GBW07601（GSH-1）进行分析测定,各微量元素测定值在标准值的范围内。结论：本方法适用于人血白蛋白中痕量元素的测定。
基金This work is sponsored by the National High—Tech Research and Development Pr0gram of China(863 Pr0gram)(special subject for nano—materials)(Grant No．2O02AA3O25O4，2002—2005)the Key Project for the Sci．＆ Tlech．Development Program of Wuhan．Hubei，China(Grant No．20041 003068一O4，2004—2006)+1 种基金the NationaI NaturaI Science Foundation of China(Key Pr0gram)(Grant No．50220160657，2003—2005) Key Project of Ministry of Education of China(2005—2006)．
文摘A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder （CoWO4/WO3） was first formed by a spray-pyrolysis technique, which was then mixed with carbon black and converted to WC-Co composite powder at 950℃ for 4 h in N2 atmosphere. The resulting powder has a particle size of 100-300 nm.
基金supported by the National Natural Science Foundation of China(No.U1830108)the Shanghai Natural Science Foundation,China(No.20ZR1405000)+1 种基金the Innovation Foundation of Shanghai Aerospace Science and Technology,China(No.SAST2018-061)the Exploratory Research Project of“Yanchang Petroleum(Group)-Fudan University”,China。
文摘An efficient method was proposed to prepare high-performance conductive AramidCarbon Blend Fabrics(ACBF)with cobalt-nickel(Co-Ni)alloy coatings,which is conducive to industrial production.The grid-like substrate composed of aramid and carbon fibers was innovatively used in flexible Electromagnetic Interference(EMI)shielding materials.The natural network structure is advantageous to the uniform deposition of metal particles to the establishment of conductive pathways subsequently in order to improve conductivity.The induction of a synergistic effect from Electromagnetic(EM)wave-reflection and EM wave-absorption through the whole carbonCo-Ni-ternary system notably enhanced the EMI Shielding Effectiveness(SE)value to an average of 42.57 d B in the range of 30-6000 MHz.On the other hand,together with the inherent toughness of the alloy coatings,the tensile strength of the aramid fibers used for bulletproof made a significant contribution to the desired mechanical properties.The light weight of the resultant composite made it applicable to aerospace vehicles simultaneously.X-ray Photoelectron Spectroscopy(XPS)was conducted to investigate the variations of elements and groups on the sample surface in pretreating process.The elemental components and surface morphologies of fabric samples during different stages of the process were investigated by Scanning Electron Microscope(SEM)and Energy Dispersive spectrometer(EDX)measurements.X-Ray Diffraction(XRD)results indicated that the obtained Co-Ni alloy coating had a combined Hexagonal Closed-Packed(HCP)and FacedCentered Cubic(FCC)crystalline phase.The relatively high corrosion resistance demonstrated in different acid and alkaline conditions was instrumental in more complex environments as well.
