A new method for the determination of trace non-rare earth elements in high purity rare earth oxides by ICP-AES with preconcentration on an active carbon-silica gel microcolumn in a flow injection system is described ...A new method for the determination of trace non-rare earth elements in high purity rare earth oxides by ICP-AES with preconcentration on an active carbon-silica gel microcolumn in a flow injection system is described in this paper. Experimental parameters such as pH, flow rate,reagent concentration,length of reaction coil,eluent acidity,etc. were optimized. In the buffer solution of NH3. H2O/NH4Cl at pH 4. 6,Al,Cr,Cu,Fe, Pb, V and Zn can be preconcentrated and then eluted with 4. 5 mol/L nitric acid utilizing stop-flow technique. The enrichment factors were in range of 8. 1￣12. 6 with detection limits of μg/m level ,and the RSD with metals at μg/g level were 2. 3￣5. 0% (n= 7). The method proposed can reduce the matrix interference effectively , and has been applied to the determination of non-rare earth metals atμg/g level in high purity Eu2O3 with satisfactory results.展开更多
The VOF method is used to simulate the dynamics of a droplet interacting with a structure consisting of an array of microcolumns mounted on a flat surface.Such a specific configuration is intended to mimic the typical...The VOF method is used to simulate the dynamics of a droplet interacting with a structure consisting of an array of microcolumns mounted on a flat surface.Such a specific configuration is intended to mimic the typical properties of lotus leaves,which typically display regularly arranged micron-scale papillary structures.After setting the initial velocity of the simulated droplet on the basis of practical considerations,an analysis is conducted about the effect of the characteristic size of the microstructure on the apparent contact angle.The pressure variation in the microstructure caves is also examined.The simulation results show that the change of the contact angle of the droplet in the quasi-static state is consistent with theoretical calculations and the contact angle in the dynamic state is smaller than that in the quasi-static state.Moreover,under dynamic conditions,the pressure fluctuation in the microstructure cave depends essentially on the characteristic size of the microstructure.展开更多
Developing efficient and robust oxygen evolution reaction(OER)catalysts in seawater is important for green hydrogen generation but remains a significant challenge.Herein,we report a hierarchical core-shell OER electro...Developing efficient and robust oxygen evolution reaction(OER)catalysts in seawater is important for green hydrogen generation but remains a significant challenge.Herein,we report a hierarchical core-shell OER electrocatalyst consisting of NiFe-layered double hydroxide nanosheets uniformly coated on a NiMoS_(x)microcolumn supported on Ni foam(NiMoS_(x)@NiFe-LDH/NF).展开更多
文摘A new method for the determination of trace non-rare earth elements in high purity rare earth oxides by ICP-AES with preconcentration on an active carbon-silica gel microcolumn in a flow injection system is described in this paper. Experimental parameters such as pH, flow rate,reagent concentration,length of reaction coil,eluent acidity,etc. were optimized. In the buffer solution of NH3. H2O/NH4Cl at pH 4. 6,Al,Cr,Cu,Fe, Pb, V and Zn can be preconcentrated and then eluted with 4. 5 mol/L nitric acid utilizing stop-flow technique. The enrichment factors were in range of 8. 1￣12. 6 with detection limits of μg/m level ,and the RSD with metals at μg/g level were 2. 3￣5. 0% (n= 7). The method proposed can reduce the matrix interference effectively , and has been applied to the determination of non-rare earth metals atμg/g level in high purity Eu2O3 with satisfactory results.
基金funding from the China Scholarship Council(CSC)and Basic Scientific Research Projects of Liaoning Provincial Department of Education:‘Design and manufacture of bionic antifogging surface of optical glass lens based on nanosecond laser’(LJKMZ20220827).Y received the grant.
文摘The VOF method is used to simulate the dynamics of a droplet interacting with a structure consisting of an array of microcolumns mounted on a flat surface.Such a specific configuration is intended to mimic the typical properties of lotus leaves,which typically display regularly arranged micron-scale papillary structures.After setting the initial velocity of the simulated droplet on the basis of practical considerations,an analysis is conducted about the effect of the characteristic size of the microstructure on the apparent contact angle.The pressure variation in the microstructure caves is also examined.The simulation results show that the change of the contact angle of the droplet in the quasi-static state is consistent with theoretical calculations and the contact angle in the dynamic state is smaller than that in the quasi-static state.Moreover,under dynamic conditions,the pressure fluctuation in the microstructure cave depends essentially on the characteristic size of the microstructure.
基金supported by the Free Exploration Project of Frontier Technology for Laoshan Laboratory(No.16-02)the National Natural Science Foundation of China(No.22072015).
文摘Developing efficient and robust oxygen evolution reaction(OER)catalysts in seawater is important for green hydrogen generation but remains a significant challenge.Herein,we report a hierarchical core-shell OER electrocatalyst consisting of NiFe-layered double hydroxide nanosheets uniformly coated on a NiMoS_(x)microcolumn supported on Ni foam(NiMoS_(x)@NiFe-LDH/NF).
