In situ Synthesis of Oligonucleotides on Plasma Treated Polypropylene Microporous Membrane

Polypropylene microporous membranes were treated with plasma in a mixture of N2 and H2 (1:2 in volume). Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and ultra-violet (UV) spectra demonstrated the success of grafting amino groups. The density of the polar amino groups on the membrane surface is about 0.59 μmol/cm^2. The as-treated membranes were successively applied to the in situ synthesis of oligonucleotides and an average coupling yield was more than 98%. The surface feature of the treated membrane is suggested to be responsible for its advantage over a glass slide.     

Nanoporous carbons as promising novel methane adsorbents for natural gas technology

Nanoporous carbons were synthesized using furfuryl alcohol and sucrose as precursors and MCM-41 and mordenite as nanoporous templates.The produced nanoporous carbons were used as adsorbent for methane storage.The average pore diameter of the samples varied from 3.9 nm to 5.9 nm and the BET surface area varied from 320m2/g to 824m2/g.The volumetric adsorption experiments revealed that MCM-41 and sucrose had better performance compared with mordenite and furfuryl alcohol,correspondingly.Also,the effect of precursor to template ratio on the structure of nanoporous carbons and their adsorption capacities was investigated.The nanoporous carbon produced from MCM-41 mesoporous molecular sieve partially filled by sucrose shows the best methane adsorption capacity among the tested samples.     

n型金刚石薄膜催化生长碳纳米管

研究了n型金刚石薄膜作为催化剂生长碳纳米管的方法.首先采用丙酮裂解化学气相沉积(CVD)法制备均匀的n型金刚石薄膜,然后采用乙醇为碳源的CVD法,在850、900和950℃下,分别在n型金刚石薄膜上制备了碳球、竹节状碳管和多壁碳纳米管.所得产物用扫描电子显微镜、透射电子显微镜、拉曼光谱和X射线光电子能谱表征.实验结果表明产物的形貌与反应温度有关.我们还提出了与金刚石催化生长碳纳米管结果相符的实验机理.     

吡啶基客体分子对枝状分子表面线状模板的选择性调节

利用扫描隧道显微术(STM)研究了枝状分子BIC3与4,4′-联吡啶(BP),吡啶乙炔撑衍生物(PE3,PE4)等分子在石墨表面的二元共组装结构.BIC3分子能够在端基为吡啶基的客体分子诱导下,形成柔性线状分子模板,并捕捉客体分子形成线状主客体结构.通过选择客体分子结构,可选择性调节BIC3主体模板结构及最终的主客体二元结构.例如,客体分子吡啶端基的间距决定BIC3-吡啶基分子主客体结构中的氢键作用方式,而客体分子侧向宽度及吡啶环的数目影响线状主客体结构的条垄间距和分子比例.研究结果为可控构筑线状主客体纳米结构,实现表面自组装结构的功能性提供了思路.     

Production of single-walled carbon nanotubes from methane over Co-Mo/MgO nanocatalyst:A comparative study of fixed and fluidized bed reactors

In this study,the performances of fixed and fluidized bed reactors in the production of single-walled carbon nanotubes(SWNTs)have been investigated.In both reactors,single-walled carbon nanotubes were grown by catalytic chemical vapor decomposition(CCVD)of methane over Co-Mo/MgO nanocatalyst under two different operating conditions.The synthesized samples were characterized by TEM,TGA and Raman spectroscopy.It is found that the performance of a fluidized bed in the synthesis of carbon nanotubes is much better than that of a fixed bed.The quality of carbon nanotubes obtained from the fluidized bed was significantly higher than that from the fixed bed and the former one with the ID/IG ratio of 0.11 while the latter one with the ID/IG ratio of 0.71.Also,the yield of SWNTs in the fluidized bed was 92 wt%,while it was 78 wt%in the fixed bed.These advantages of fluidized bed reactors for the synthesis of carbon nanotubes can be attributed to more available space for the growth of carbon nanotubes and more uniform temperature and concentration profiles.     

Hetero-nanostructure of silver nanoparticles on MO_x(M=Mo,Ti and Si) and their applications

This paper reviews the recent research progress in the hetero-nanostructure of silver nanoparticles on MOx (M=Mo, Ti and Si). It describes the general synthesis of hetero-nanostructure of silver nanoparticles on MOx, and then outlines the interesting catalytic and sensing properties found in these hetero-nanostructures of silver nanoparticles on MOx.     

Eye location under different eye poses,scales,and illuminations

Robust non-intrusive eye location plays an important role in vision-based man-mechine interaction. A modified Hausdorff distance based measure to localize the eyes is proposed, which could tolerate various changes in eye pose, shape, and scale. To eliminate the effects of the illumination variations, an 8- neighbour-based transformation of the gray images is proposed. The transformed image is less sensitive to illumination changes while preserves the appearance information of eyes. All the localized candidates of eyes are identified by back-propagation neural networks. Experiments demonstrate that the robust method for eye location is able to localize eyes with different eye sizes, shapes, and poses under different illuminations.     

基于核酸适体的丙肝病毒核心蛋白检测新方法

丙型病毒性肝炎是由丙型肝炎病毒(hepatitis C virus,HCV)引起的一种传染性疾病.发展对HCV抗原具有高亲和力高特异性的识别分子和检测方法对丙肝进行早期诊断具有非常重要的意义.我们通过SELEX筛选得到了能特异性识别HCV核心蛋白(core蛋白)的DNA核酸适体,建立了可对HCV core蛋白进行高灵敏检测的核酸适体-酶联免疫新方法,并成功应用于丙肝病人血清中HCV core蛋白的检测,有望发展成为简便、灵敏、低成本的HCV早期诊断和血清筛查新方法.     

高能量密度锂二次电池电极材料研究进展

锂离子电池是目前广泛应用的高能量密度小型二次电池,但随着其应用领域突飞猛进的发展,迫切需要进一步提高其能量密度.本文介绍了近年来高能量密度锂离子电池正、负极材料及新型高能量密度锂二次电池体系方面的研究进展;结合本实验室的研究工作,着重介绍了高容量正、负极材料的选择、微纳结构设计、表面包覆和合成策略;讨论了锂硫电池、锂空气电池等高比能金属锂二次电池的未来发展方向.     

内嵌富勒烯的研究进展

内嵌富勒烯由于其结构新颖以及独特而优异的性质在国际上引起持续而广泛的关注,成为近年来的研究热点之一.目前已经研究发现的内嵌富勒烯多达近百种,从惰性气体到碱土金属再到稀土元素都已被成功地嵌入到不同尺寸的碳笼中.其中金属离子或含金属的离子簇内嵌入富勒烯碳笼形成的内嵌金属富勒烯,以其种类丰富、结构多样成为内嵌富勒烯的主要研究对象.本文就近年来研究报道的种类繁多的内嵌富勒烯按其内嵌物类型进行归纳阐述,为今后开发更多新型的内嵌富勒烯提供一定的参考.