Modulating the Electronic Structures of Single-walled Carbon Nanotubes by Filling with Electron Acceptors and the Effect on Their Reactivity with Aryl Diazonium Salts

The electronic structures of single-walled carbon nanotubes （SWCNTs） were modulated by filling with tetracyanoquinodimethane （TCNQ）, a strong electron acceptor. The structures of TCNQ-filled SWCNTs were checked by X-ray diffraction analysis, high-resolution transmission electron microscopy and Raman spectroscopy. Optical absorption spectroscopy demonstrated an enhanced reactivity between aryl diazonium and semiconducting SWCNTs.     

缩酮席夫碱类阴离子识别的量子化学研究

缩酮席夫碱是良好的阴离子识别剂,利用量子化学密度泛函理论研究了3种缩酮席夫碱阴离子受体与阴离子客体相结合的空间结构、电荷分布、结合能等方面的变化,计算结果表明,阴离子受体分子的阴离子结合位点位于亚氨基-NH-部,受体分子和阴离子间通过氢键相互作用,阴离子有一部分负电荷转移到受体分子中,且转移的电荷量为R3-3 R3-2 R3-1,在考察的阴离子中,F~-与受体分子的结合能最大,而在3种受体分子中,R3-3对阴离子结合能最大.计算模拟结果,与实验情况相吻合.     

An Improved Model of the Jovian Magnetosphere

The Jovian magnetosphere is modulated by the solar wind and centrifugal force. The configuration of the magnetic field in the previous model of the magnetosphere including the centrifugal force is consistent with the observations at low magnetic latitude （Λ〈50°）, while there is a substantial difference between the results of the model and the observations at high magnetic latitude （Λ≥50°）, especially in the distant magnetotail. Based on the previous model, a new configuration of the Jovian magnetosphere in the night side is suggested by a three-step transformation in this study. The new magnetosphere obtained by the transformation method is flattened in the z-direction and stretched in the x-direction in distant magnetotail, which agree with general knowledge.     

Plasma Resources of Jupiter＇s Main Auroral Oval

Jupiter＇s aurora exhibits three distinct regions： the satellite footprint emissions, the main oval emissions and all polar emissions. As the case of the Earth, the auroral morphology contains both qualitative and quantitative clues about magnetospheric structure and dynamics. We map along the magnetic field lines to the equatorial plane to track the plasma resources of the main oval in an equilibrium model of Jupiter＇s magnetosphere. The footprints of the satellites are good references to help us to check the mapping. We find out that the plasma of oval emissions originates from the equatorial plane with a distance of～22.0RJ, which is closer to the Jupiter than 30RJ given by the VIP4 model. However the difference does not deny the conclusion that the upward Birkeland currents produce the oval emissions.     

Model for Formation of Dunes at the North Martian Pole

The Mars Global Surveyor Mars Orbiter Camera （MOC） took images of a series of strange horseshoe-shaped dunes at the North Martian pole in 2004. These dunes would be formed due to the strong Martian winds whose pattern is different from that on the Earth. We study the cause of the formation of these dunes and make a model for them. In this model, wind speed near the north Martian pole can be evaluated based on the shape of the dunes. We also estimate the surpassing speed of dunes of different sizes.     

Bio-inspired nanoenzyme for metabolic reprogramming and anti-inflammatory treatment of hyperuricemia and gout

Gout,a common type of inflammatory arthritis resulting from chronic elevation of uric acid(UA)level,is usually accompanied with hyperuricemia.The current clinical drugs for the treatment of gout and hyperuricemia are greatly restricted by their limited therapeutic efficacy,off-target toxicity and severe side effects.Here,a neutrophil membrane(NM)-coated and cascade catalytic nanoenzyme was devised with excellent inflammation targeting,inflammatory cytokines neutralizing and UA degrading characteristics for the treatment of gout and hyperuricemia with high efficacy and safety.This nanoenzyme was fabricated by encapsulating uricase(UOx)and catalase(CAT)into zeolitic imidazolate framework-8(ZIF-8)and further coating it with NM.The NM-coated nanoenzyme inherits the antigenic exterior and cell membrane functions of neutrophils for inflammation targeting and cytokine neutralization.UOx and CAT encapsulated in ZIF-8 could efficiently degrade UA and eliminate hydrogen peroxide(H₂O₂)via a biocatalytic cascade,thus successfully blocking the inflammation amplification during gout development.Both in vitro and in vivo experiments demonstrated the preferable potentials of the nanoenzyme for gout targeting,inflammation elimination and UA degradation,exhibiting great promise for the treatment of gout and hyperuricemia in an effective and safe manner.     

基于3，4-乙撑二氧基噻吩环配体的铜/锌配合物的合成、晶体结构及性质

利用3,4-乙撑二氧基噻吩-2,5-二羧酸(H_2L_1)为主配体,2,2′-联吡啶(L_2)、4,4′-联吡啶(L_3)为辅配体,分别与二水合氯化铜、氯化锌通过溶剂热反应得到配合物{[Cu_2(L_1)_2(L_2)(H_2O)_2(DMF)]·3H_2O}n (1)(DMF=N,N-二甲基甲酰胺)和配合物{[Zn(L_1)(L_3)(H_2O)2]·H_2O}n (2)。通过X射线单晶衍射法、红外光谱、元素分析、紫外光谱、荧光光谱、热重分析等测试手段对其结构进行了表征与性质研究。单晶结构分析表明:配合物1是由L_1~(2-)桥联Cu~(2+)形成的二维层状结构,并进一步通过氢键作用形成三维网络结构。配合物2是由L_1~(2-)连接Zn~(2+)形成一维链,并进一步桥联4,4′-联吡啶形成为一维带状结构,通过配位水分子与配体氧原子的氢键作用及带与带之间的π-π堆积形成三维结构。荧光分析和热重分析结果分别表明配合物1和2均有良好的荧光性能和热稳定性。配合物1和2的最大发射波长分别为364和365 nm。     

The Communicating Pipe Model for Icy Plumes on Enceladus

We analyze the communicating pipe model on Enceladus, and predict that Saturn＇s strong tidal force in Enceladus plays a significant role in the plumes. In this model, the scale of the volcanoes can be evaluated based on the history of the craters and plumes. The correspondence of the data and observation make the model valid for the eruption. So it is imaginable that the tidal force is pulling the liquid out through the communicating pipe while reshaping the surface on Enceladus.