吡啶-水体系中快速合成纳米Pt的新方法

在吡啶-水体系中用KBH4还原H2PtCl4首次制得了贵金属Pt纳米粒子且纳米Pt体系不受空气的影响可以较长时间的存在，并通过透射电镜(TEM)、低能电子衍射和紫外漫反射(UV-Vis)对其进行了表征．Pt纳米粒子的平均粒径在2．0～3．0nm，该体系同时也可以制备Ru、Pd等纳米粒子．     

Advanced glycation end-products inhibitors isolated from Schisandra grandiflora

Free radicals scavenging and advanced glycation end-products (AGEs) inhibitory potentials in crude chloroform extract of Schisandra grandiflora were evaluated. Bioassay-guided isolation of the chloroform extract led to the identification of 24 compounds. Among the isolates, ( ± ) gomisin M₁, arisantetralone C and D, macelignan, saurulignan B and SZ-MO displayed potent-free radical scavenging as well as AGEs inhibitory potentials. This is the first report identifying the presence of AGEs inhibitory activity and assigning AGEs inhibitory activity to these compounds. Therefore, our research finds new application of traditional medicinal plant S. grandiflora having capacity to reduce formation and accumulation of AGEs in diabetes.     

Tunneling Electron Induced Fluorescence from Single Porphyrin Molecules Decoupled by Striped-Phase Octanethiol Self-assembled Monolayer

We investigate tunneling electron induced luminescence from isolated single porphyrin molecules that are decoupled by striped-phase self-assembled monolayer of octanethiol from the underneath Au(111) substrate. Intrinsic single-molecule electroluminescence has been realized by such decoupling at both bias polarities. The photon emission intensity acquired from the molecular lobe is found stronger than that from the molecular center. These re-sults provide useful information on the understanding of electroluminescent behavior and mechanism in molecular tunnel junctions.     

改革教学方法,提高扫描电镜实验教学效果

针对目前本科生扫描电镜实验教学中存在以理论讲解和教师操作为主,学生主动参与性差,教学效果不理想等情况,建立以提高实验教学效果为目标的教学改革方法。通过精心设计实验教学内容、改进教学方法,以实例教学法加深学生对二次电子和背散射电子像、分辨率及景深等抽象概念的理解,增加学生自制样品观察,突出能谱测试的应用场合。授课方式既有理论讲解,又有实例图示及相关计算,使实验教学更具趣味性,激发学生的求知欲望,体现学生的主体作用,培养学生分析问题、解决问题的能力,切实提高材料专业扫描电镜实验的教学效果。     

Compact Scanning Tunneling Microscope with Large Scale Searching Capability for Mmultidisciplinary Applications

We present the design and performance of a home-built scanning tunneling microscope (STM), which is compact (66 mm tall and 25 mm in diameter), yet equipped with a 3D atomic precision piezoelectric motor in which the Z coarse approach relies on a high simplic-ity friction-type walker (of our own invention) driven by an axially cut piezoelectric tube. The walker is vertically inserted in a piezoelectric scanner tube (PST) with its brim laying at on the PST end as the inertial slider (driven by the PST) for the XZ (sample plane) motion. The STM is designed to be capable of searching rare microscopic targets (defects, dopants, boundaries, nano-devices, etc.) in a macroscopic sample area (square millimeters) under extreme conditions (low temperatures, strong magnetic elds, etc.) in which it ts. It gives good atomic resolution images after scanning a highly oriented pyrolytic graphite sample in air at room temperature.     

多学科应用可大范围搜索的紧凑型扫描隧道显微镜

本文展示了结构紧凑的（高度为66 mm,直径为25 mm）扫描隧道显微镜,配备了一套拥有原子级分辨精度的三维压电马达。其中Z方向定位依靠的是自行发明的由轴向切割的压电扫描管驱动的摩擦型步进器。X-Y方向（即样品面方向）的移动是将Z向步进器作为一个惯性滑块垂直嵌入压电扫描管内同时一端平放在压电扫描管的顶部。其设计具有在极端条件下（低温、强磁场等）从宏观尺度样品区域（平方毫米级别）搜索微观靶向（缺陷位、掺杂位、边界及纳米器件等）的能力。在室温大气下对高定向热解石墨进行测量,得到了高分辨率的原子图像.     

SHG Materials Based on the AlPO4-5 Single Crystals

Large AlPO4-5 molecular sieve single crystals with high optical quality were synthesized hydrothermally by using TPA as template. As-synthesized crystals were calcined under O2 atmosphere to remove the organic templates in the channels. Disperse-Red-1 (DR1) and p-nitroaniline (pNA) molecules have been successfully incorporated into the one-dimensional channels of AlPO4-5 single crystals respectively by means of vapor phase diffusion. XRD patterns reveal that the loading of organic molecules has not destroyed the structures of AlPO4-5 crystals. Polarizing microscope and SHG results indicate that the DR1 and pNA molecules are well aligned in a preferred direction along the crystal channels. The different polarization-dependence SH intensity shows that different SHG processes occur in the DR1- and pNA-loaded AlPO4-5 crystals.     

电响应聚合物薄膜的表面图案化

由于图案化的功能表面在制备微流体器件和生物芯片等方面具有巨大应用潜力而备受关注,表面图案化的方法很多，如微接触印刷、光刻蚀和电子束刻蚀等等,聚2-丙烯酰胺基-2-甲基丙基磺酸（PAMPS）是一种电响应聚合物，在电场的作用下其体积能发生大幅度的变化，我们曾经报道通过带偏压的原子力针尖对PAMPS薄膜的微观浸润性进行调控,本文采用预先结构化的电极对薄膜施加电场，实现了其表面性质的图案化控制，对制备新型聚合物微器件具有重要意义。     

用TEM分析溅射法制备Ag超微粒的空间分布

用透射电镜对在氩气中电离溅射沉积于碳膜上的Ag超微粒进行了直接研究。通过明场象和电子衍射观察分析发现,在溅射入射角为60°时,经不同的出射角收集,形成的超微粒的粒径、粒径分布、形态和物相结构各有不同。