The governing differential equation of micro/nanbeams with atom/molecule adsorption is derived in the presence of surface effects using the nonlocal elasticity. The effects of the nonlocal parameter, the adsorption de...The governing differential equation of micro/nanbeams with atom/molecule adsorption is derived in the presence of surface effects using the nonlocal elasticity. The effects of the nonlocal parameter, the adsorption density, and the surface parameter on the resonant frequency of the micro/nanobeams are investigated. It is found that, in ad- dition to the nonlocal parameter and the surface parameter, the bending rigidity and the adsorption-induced mass exhibit different behaviors with the increase in the adsorption density depending on the adatom category and the substrate material.展开更多
采用密度泛函理论计算了碲纳米线和碲纳米带的电荷分布,并且研究了碲纳米带上的氢原子(H)、氟原子(F)和水分子(H2O)吸附。研究发现,六边形纳米线的价带顶(Valence band maximum)和导带底(Conduction band minimum)分布具有三重轴对称性...采用密度泛函理论计算了碲纳米线和碲纳米带的电荷分布,并且研究了碲纳米带上的氢原子(H)、氟原子(F)和水分子(H2O)吸附。研究发现,六边形纳米线的价带顶(Valence band maximum)和导带底(Conduction band minimum)分布具有三重轴对称性,而碲纳米带的VBM和CBM对应的电荷分布和自身的结构对称性相符。由于碲纳米带结构自身的非对称性,导致内部电荷发生转移,使VBM和CBM分别分布在纳米带的两端。碲纳米带上吸附H和F原子时,碲纳米带呈现p型特性;吸附H2O分子时,碲纳米带与H2O分子呈弱相互作用,不改变碲纳米带的电子性质。展开更多
Anticoagulation factor I (ACF I) from the venom of Agki^strodon acutus is a binding protein to activated coagulation factor X (FXa) and possesses marked anticoagulant activity. Single ACF I molecule has been succe...Anticoagulation factor I (ACF I) from the venom of Agki^strodon acutus is a binding protein to activated coagulation factor X (FXa) and possesses marked anticoagulant activity. Single ACF I molecule has been successfully imaged in air by tapping mode atomic force microscopy (AFM) with high resolution using glutaraldehyde as a coupling agent. The physical adsorption and covalent binding of ACF I onto the mica show very different surface topographies. The former exhibits the characteristic strand like structure with much less reproducibility, the latter displays a elliptic granular structure with better reproducibility, which suggests that the stability of ACF I molecules on the mica is enhanced by covalent bonding in the presence of glutaraldehyde. A small scale AFM amplitude mode image clearly shows that the covalently bonded ACF I molecule by glutaraldehyde has olive shape structure with an average size of 7 4 nm×3 6 nm×3 1 nm, which is very similar to the size determined from the crystal structure of ACF I.展开更多
Interactions between Nitric oxide (NO) and DDPA Langmuir-Blodgett (LB) film are investigated with second harmonic generation (SHG) and atomic force microscopy (AIM). It has been found mat the adsorption of NO molecule...Interactions between Nitric oxide (NO) and DDPA Langmuir-Blodgett (LB) film are investigated with second harmonic generation (SHG) and atomic force microscopy (AIM). It has been found mat the adsorption of NO molecules on DDPA LB film only changes the value of the second-order susceptibility of the DDPA molecule on film but not its orientation.展开更多
基金Project supported by the National Basic Research Program of China(No.2011CB610300)the 111 Project of China(No.B07050)+3 种基金the National Natural Science Foundation of China(Nos.10972182, 11172239,and 10902089)the Doctoral Program Foundation of Education Ministry of China (No.20106102110019)the Open Foundation of State Key Laboratory of Structural Analysis of Industrial Equipment of China(No.GZ0802)the Doctorate Foundation of Northwestern Polytechnical University of China(No.CX201111)
文摘The governing differential equation of micro/nanbeams with atom/molecule adsorption is derived in the presence of surface effects using the nonlocal elasticity. The effects of the nonlocal parameter, the adsorption density, and the surface parameter on the resonant frequency of the micro/nanobeams are investigated. It is found that, in ad- dition to the nonlocal parameter and the surface parameter, the bending rigidity and the adsorption-induced mass exhibit different behaviors with the increase in the adsorption density depending on the adatom category and the substrate material.
文摘采用密度泛函理论计算了碲纳米线和碲纳米带的电荷分布,并且研究了碲纳米带上的氢原子(H)、氟原子(F)和水分子(H2O)吸附。研究发现,六边形纳米线的价带顶(Valence band maximum)和导带底(Conduction band minimum)分布具有三重轴对称性,而碲纳米带的VBM和CBM对应的电荷分布和自身的结构对称性相符。由于碲纳米带结构自身的非对称性,导致内部电荷发生转移,使VBM和CBM分别分布在纳米带的两端。碲纳米带上吸附H和F原子时,碲纳米带呈现p型特性;吸附H2O分子时,碲纳米带与H2O分子呈弱相互作用,不改变碲纳米带的电子性质。
文摘Anticoagulation factor I (ACF I) from the venom of Agki^strodon acutus is a binding protein to activated coagulation factor X (FXa) and possesses marked anticoagulant activity. Single ACF I molecule has been successfully imaged in air by tapping mode atomic force microscopy (AFM) with high resolution using glutaraldehyde as a coupling agent. The physical adsorption and covalent binding of ACF I onto the mica show very different surface topographies. The former exhibits the characteristic strand like structure with much less reproducibility, the latter displays a elliptic granular structure with better reproducibility, which suggests that the stability of ACF I molecules on the mica is enhanced by covalent bonding in the presence of glutaraldehyde. A small scale AFM amplitude mode image clearly shows that the covalently bonded ACF I molecule by glutaraldehyde has olive shape structure with an average size of 7 4 nm×3 6 nm×3 1 nm, which is very similar to the size determined from the crystal structure of ACF I.
基金Project (No. 19434012) supported by the National Natural Science Foundation of China and by the Climbing Proect.
文摘Interactions between Nitric oxide (NO) and DDPA Langmuir-Blodgett (LB) film are investigated with second harmonic generation (SHG) and atomic force microscopy (AIM). It has been found mat the adsorption of NO molecules on DDPA LB film only changes the value of the second-order susceptibility of the DDPA molecule on film but not its orientation.
