A new type of photocatalytic La^(3+)–Zn^(2+)–Al^(3+)–MoO_4^(2-) layered double hydroxide(LDH) material(molar ratio, La/Zn/Al = 1:7:2) was prepared by a complexing agent-assisted homogeneous precipitation technique....A new type of photocatalytic La^(3+)–Zn^(2+)–Al^(3+)–MoO_4^(2-) layered double hydroxide(LDH) material(molar ratio, La/Zn/Al = 1:7:2) was prepared by a complexing agent-assisted homogeneous precipitation technique. The structure of the prepared LDH material was systematically studied. Under UV irradiation, the desulfurization efficiency of the LDH material was 87% in 2 h. For La^(3+)–Zn^(2+)–Al^(3+)–MoO_4^(2-) LDH material, the introduction of MoO_4^(2-) increased the interlayer space for promoting the adsorption of benzothiophene(BT), and MoO_4^(2-) might provide active sites for the oxidation of BT, resulting in the high desulfurization efficiency.展开更多
Since the discovery of the first drum-like CoB16- complex, metal-doped drum-like boron nanotubular structures have been investigated with various metal dopants and different tubular size, forming a new class of novel ...Since the discovery of the first drum-like CoB16- complex, metal-doped drum-like boron nanotubular structures have been investigated with various metal dopants and different tubular size, forming a new class of novel nanostructures. The CoB16- cluster was found to be composed of a central Co atom coordinated by two fused B8 rings in a tubular structure, representing the potential embryo of metal-filled boron nanotubes and providing opportunities to design one-dimensional metal-boron nanostructures. Here we report improved photoelectron spectroscopy and a more in-depth electronic structure analysis of CoB16-, providing further insight into the chemical bonding and stability of the drum-like doped boron tubular structures. Most interestingly, we find that the central Co atom has an unusually low oxidation state of ?1 and neutral CoB16 can be viewed as a charge transfer complex (Co-@BB16+), suggesting both covalent and electrostatic interactions between the dopant and the boron drum.展开更多
Miniaturization of Frequency Selective Surface's ( FSS's) size is significant for its application in the limited space. In this paper, a novel methodology for designing low-profile FSS is discussed, and a corr...Miniaturization of Frequency Selective Surface's ( FSS's) size is significant for its application in the limited space. In this paper, a novel methodology for designing low-profile FSS is discussed, and a corresponding multi-layer structure with lumped elements for band-pass response is presented. Based on the equivalent circuit theory,the inductive designed center layer is firstly discussed. Then different numbers of additional capacitive designed layers are added and their performances are presented. Finally,the lumped elements are added both between adjacent layers and between adjacent cells of the additional layers so that the miniaturization performance can be further improved. The simulations for each structure in waves of different polarizations and incident angles are conducted,and the results are presented,which demonstrate the claimed characteristics of the proposed structure.展开更多
文摘A new type of photocatalytic La^(3+)–Zn^(2+)–Al^(3+)–MoO_4^(2-) layered double hydroxide(LDH) material(molar ratio, La/Zn/Al = 1:7:2) was prepared by a complexing agent-assisted homogeneous precipitation technique. The structure of the prepared LDH material was systematically studied. Under UV irradiation, the desulfurization efficiency of the LDH material was 87% in 2 h. For La^(3+)–Zn^(2+)–Al^(3+)–MoO_4^(2-) LDH material, the introduction of MoO_4^(2-) increased the interlayer space for promoting the adsorption of benzothiophene(BT), and MoO_4^(2-) might provide active sites for the oxidation of BT, resulting in the high desulfurization efficiency.
基金supported by the National Natural Science Foundation of China (No.21590792, No.91426302, and No.21433005)supported by the U.S. National Science Foundation (CHE-1763380)
文摘Since the discovery of the first drum-like CoB16- complex, metal-doped drum-like boron nanotubular structures have been investigated with various metal dopants and different tubular size, forming a new class of novel nanostructures. The CoB16- cluster was found to be composed of a central Co atom coordinated by two fused B8 rings in a tubular structure, representing the potential embryo of metal-filled boron nanotubes and providing opportunities to design one-dimensional metal-boron nanostructures. Here we report improved photoelectron spectroscopy and a more in-depth electronic structure analysis of CoB16-, providing further insight into the chemical bonding and stability of the drum-like doped boron tubular structures. Most interestingly, we find that the central Co atom has an unusually low oxidation state of ?1 and neutral CoB16 can be viewed as a charge transfer complex (Co-@BB16+), suggesting both covalent and electrostatic interactions between the dopant and the boron drum.
基金Sponsored by the National Natural Science Foundation of China(Grant No.60801015 and 61001036)the Special Funds Projects for Technological and Innovative Talent of Harbin City(Grant No.2010RFXXG010)+2 种基金the Fundamental Research Funds for the Central Universities(No.HIT.IBRSEM.2009 and HIT.NSRIF.201153)China Postdoctoral Science Foundation(Grant No.LBH-Z10126)Heilongjiang Province Postdoctoral Foundation(Grant No.20110491093)
文摘Miniaturization of Frequency Selective Surface's ( FSS's) size is significant for its application in the limited space. In this paper, a novel methodology for designing low-profile FSS is discussed, and a corresponding multi-layer structure with lumped elements for band-pass response is presented. Based on the equivalent circuit theory,the inductive designed center layer is firstly discussed. Then different numbers of additional capacitive designed layers are added and their performances are presented. Finally,the lumped elements are added both between adjacent layers and between adjacent cells of the additional layers so that the miniaturization performance can be further improved. The simulations for each structure in waves of different polarizations and incident angles are conducted,and the results are presented,which demonstrate the claimed characteristics of the proposed structure.
