酸碱指示剂的发展方向

介绍了酸碱指示剂的基础知识和选择依据,重点介绍了目前天然植物色素在酸碱指示剂和酸碱滴定中的应用。同时,由于新技术的快速发展,基于纳米技术和DNA结构转变的无污染环保指示剂更加值得关注。     

Mechanism of Enhanced Dielectric Properties of SiC/Ni Nanocomposites

Dielectric properties of SiC/Ni nanocomposites prepared by a simple and facile electroless plating approach at X band are investigated. Compared to the original SiC nanopartieles （SiCp）, the real part of the permittivity, ε＇, and the dielectric loss tangent tang δe of SiC/Ni nanocomposites are clearly enhanced by about 31% and 33%, respectively. The effective equations for complex permittivity of SiC/Ni nanoeomposites are proposed. We also calculate ε＇ and tan δe of SiC/Ni nanoeomposites and the calculated results are well consistent with the measured data.     

The influence of nickel dopant on the microstructure and optical properties of SnO2 nano-powders

The microstructure and optical properties of Ni-doped SnO2 nano-powders are studied in detail. By Ni-doping, not only the grain size reduces, but also the grain shape changes from nano-rods to spherical particles. The crystallization becomes better with annealing temperature increasing. The band gap energy decreases as nickel doping level increases. The sp-d hybridization and alloying effect due to amorphous SnO2-x phase should be responsible for the band gap narrowing effect. Nickel dopant does not change the photoluminescence （PL） peak positions.     

Ultra-large Scale Molecular Dynamics Simulation for Nano-engineering

In light of the special need of nano-engineering, an ultra-large scale and high-performance molecular dynamics（MD） simulation program was implemented. In many nano-engineering processes, the free boundary condition should be adopted. To meet this particular requirement, a pointer link and dynamic array data structures were employed so that both reliability and accuracy of simulation could be ensured. Using this method, one could realize the MD simulation of the nano-engineering system consisting of several million atoms per single CPU.     

ICAS-2006——分析科学国际大会 (Ⅱ)

传感器组的报告有:(K1)K Suzuki,以新颖化学传感探针为基础的化学传感器;(K2)Yu G Vla-sov,分析化学中的传感阵列(电子鼻与电子舌)——历史与现状;(K3)S Dong,供传感器与传感技术用的生物材料与纳米结构集成体的整合;(K4)N El Murr,易适应还原氧化反应的氧化酶生物传感器——生     

科学家利用纳米技术“光测”癌细胞

日前,南开大学多位科学家经过跨学科合作研究,利用全内反射下石墨烯对介质折射率异常敏感的光学现象,实现了超灵敏单细胞实时流动传感。这一科技成果可以使癌细胞在形成之初即被精确＂光测＂出来,精度可达细胞数的千分之一。石墨烯是一种呈蜂巢状排列的单层碳原子结构,也是目前已知的最薄、最坚硬的纳米材料,具有优良的物理化学性能。     

Blue Luminescence of CdS Nanowires Synthesized by Sulfurization

Polycrystalline CdS nanowires have been synthesized by sulfurizing metal Cd nanowires deposited electrochemically within the nanochannels of porous anodic alumina (PAA ) templates. Photoluminescence (PL) investigation shows that the CdS nanowires have an intensive and broad PL emission band peaked around 435 nm. The investigation results suggest that localized defects and excess S atoms existing in the CdS nanowires are responsible for this blue luminescence.     

打造我们的纳米时代

 “毫无疑问,当我们得以对细微尺度的事物加以操纵的话,将大大扩充我们可能获得物性的范围。”1959年,理查德·费恩曼最早地提出了纳米尺度上的科学和技术问题。40年后的今天,“纳米热”遍及全球,声势夺人。科学家和各国政府将纳米科技和信息技术、生物技术同列为引导21世纪工业革命的主流和关键技术。1.何为纳米科技纳米科技是指在纳米尺度上研究物质的特性和相互作用,以及利用这些特性开发新产品的一门多学科交叉融合的科学和技术。纳米尺度指显微结构小于100ｎｍ,包括微粒尺寸、晶粒尺寸、晶界带宽、第二相分布、气孔尺寸、缺陷尺寸等均达到纳米水平。     

纳米科技课程资源的开发与实施

纳米科学技术(Nano-ST)是20世纪80年代初迅速崛起的新科技,在"信息科学技术"、"生命科学技术"、"新能源与可再生能源科学技术"、"新材料科学技术"、"有益于环境的高新技术"、"空间科学技术"[1]等高科技领域有着广泛地应用.正如著名科学家钱学森所预言:"纳米和纳米以下的结构是下一阶段科技发展的重点,会是一次技术革命,从而将是21世纪又一次产业革命."纳米新科技将成为21世纪科学的前沿和主导科学[2].     

纳米药物分析

介绍了纳米药物的定义,简明叙述了纳米药物的特点,探讨了新纳米药物目前研究重点,包括新纳米材料的药用功效研究、新药物载体和药物新剂型的开发及其涉及到的分析技术。展望了纳米药物对分析化学所提出的机遇和挑战。