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【資源】掃描探針顯微鏡在納米技術(shù)的應(yīng)用進(jìn)展：美麗的納米技術(shù)圖片
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這篇帖子“掃描探針顯微鏡在納米技術(shù)的應(yīng)用進(jìn)展：美麗的納米技術(shù)圖片”特為答謝dongfang1629超版與popsheng區(qū)長： 歡迎蟲子們繼續(xù)補(bǔ)充。 Beautiful nanotechnology images from the SPMage competition These images recognize the continuing contributions that Scanning Probe Microscopes have made to advances in Nanotechnology. Nano Rings  Beautiful nanotechnology images from the SPMage competition These images recognize the continuing contributions that Scanning Probe Microscopes have made to advances in Nanotechnology. The image shows a four-terminal quantum ring structure defined in a two-dimensional electron gas (2DEG) with local anodic oxidation using an atomic force microscope tip. The elevated white lines represent the oxide on the surface of the GaAlAs heterosstructure containing the 2DEG. These oxide lines are on average 15nm high and penetrate just as deep into the sample surface, forming barriers in the electron gas below. The ring has an average diameter of 1 micron and the four outer rectangular areas enclosed by oxide lines are used as in-plane gates to tune the electron density of the four arms of the ring. Measuring Aharonov-Bohm oscillations in the ring conductance this device is used to interferometrically detect the relative phaseshift of Coulomb blockade resonances in two quantum dots induced in the arms of the ring. (Dr Andreas Fuhrer, Nanophysics Group of Prof. Ensslin at ETH Zürich/Switzerland) The surface of human red blood cells after treatment with an antibiotic peptide  Phyllomelittin is a novel antibiotic peptide isolated from the skin of the monkey frog Phyllomedusa hypochondrialis. It has been demonstrated that antibiotic peptides exert their activities by disrupting cell membranes. Therefore, the study of the effects of such peptides on cell membranes has been the focus of intense research efforts using the atomic force microscopy (AFM). The aim of this study was to investigate the surface of human red blood cells (RBCs) after treatment with phyllomelittin. The cells were deposited onto a glass slide (blue) and fixed with methanol for 5 minutes. The image shows the intermittent contact mode topography (14.5 μm x 14.5 μm x 819 nm) of three RBCs after 25 minutes of incubation with phyllomelittin at 32 μM. A large number of elevations of few nanometers (yellow) were found to be distributed heterogeneously on the RBCs surface (red), presumably reflecting the regions of the cell membrane disrupted by and/or interacting with phyllomelittin molecules. (Dr Luciano Paulino Silva, EMBRAPA Recursos Genéticos e biotecnología Brasilia/Brazil) Root  The ability to control the size of conductive nanostructures and to manipulate them on a nanometer scale are priority subjects in the field of nanotechnology. One of the promising way for miniaturization is a template direct method. Polyelectrolytes molecules (PE) offers a range of interesting properties, such as, unique recognition, association and ability to assemble conductive polymers and metals. That is why PE are one of the most attractive templates. The ability to reproducibly create and align well-stretched PE molecules very important for realizing nanoscale electronics. We developed a simple method creating highly aligned PE molecules, which enabled us to straighten and fix PE molecules on the surface without any surface modification or special equipment. Some times, during our AFM measurement, we found unusual structures. One of them have been chosen for SPMAGE07. This image represent part of PE network absorbed on hydrophobic surface. (Mr. Konstantin Demidenok, Leibniz-Institut fur Polymer Forshung Dresden/Germay) Escherichia coli (E. coli) with Pili and Flagella  An Escherichia coli cell is imaged using tapping mode AFM under dry condition. Well preserved pili and flagella structures can be seen clearly. The size of the cell is about 1.9um long and 1um wide. The width of pili is about 20nm and flagella is about 30nm. (Mr Ang Li, National University of Singapore) Nano Clover  AFM microscopy has emerged as an efficient tool to observe molecules deposited on a surface, specially the changes suffered after induction of external factors. The image shows fibres after treatment with ultrasounds of a bismuth cluster (2 nm high). It is interesting to observe the singular arrangement of the fibres on the surface at the first moments after deposition. (Mrs Lorena Welte Hidalgo, Universidad Autonoma de Madrid/Spain) Fantasy  MMX polymers are a particular type of coordination polymer assembled by dimetallic subunits bridged by halides (Cl, Br or I). This kind of compounds is very attractive because of their chemical-physical properties, such as magnetism, electrical conduction, etc… In order to study MMX properties by AFM, the polymers have to be deposited on a surface. The resulting deposition depends on the surface and on the concentration of the sample. In our case, the samples were deposited on a HOPG surface. At low concentrations, the AFM image shows a single MMX polymer, whereas at higher concentrations, superposition of MMXs builds a layer with a peculiar topography, shown in the image. (Dr Rodrigo Gonzalez Prieto, Universidad Autonoma de Madrid/Spain) Climatic change on carbon nanotubes  Carbon nanotubes have many characteristics that promise to revolutionize the world of structural materials. There are different ways to grow carbon nanotubes, especially the CVD technique, which allows obtaining SWCNT’s on a silicon surface. These SWCNT can be carried from the silicon surface to another surface, as HOPG, without suffering changes on their properties. That means nanomanipulation of carbon nanotubes. (Mr Miguel ?ngel Fernández Vindel, Universidad Autonoma de Madrid/Spain) Quantum Forest  GeSi quantum dots on Si, average diameter approx. 70 nm, typical height approx. 15 nm. (Mr Thorsten Dziomba. Physikalisch-Technische Bundesanstalt, Germany) Other images of interest Nature knows  The gecko can walk up glass and even hang upside down. The hairs (spatulae) on its feet are so small they can exploit forces that pull molecules together, sticking the gecko to the ceiling. Nanotech can make sticky tape lined with gecko-like synthetic hairs that do the same job. Same feel  Nanotech should not be confused with miniaturisation – although it will lead to smaller components in chips, for example. Nanotech exploits the novel properties seen in materials when their atoms and molecules are very carefully arranged. These properties are not generally seen in large-scale solids of the same chemical composition. Tiny world  "Nano" comes from the Greek "dwarf". It is used in the metric system to refer to "billionth" - a nanometre (nm) is a billionth of a metre. Put another way, this is about 1/50,000th the width of a human hair. Normal office paper is about 100,000nm thick. Nanotechnologists will typically work in the range 1-100nm. Big future  Nanotechnology concerns materials and working devices that are engineered at the scale of atoms and molecules. Advances in nanotech will affect electronics and computing, medicine, cosmetics, foods, the military, energy all walks of life. By 2020, $1 trillion worth of products could be nano-engineered in some way Little bits  The cosmetics industry already puts nano-particles in lotions, creams and shampoos. Nano-sized zinc oxide particles are used in suncreams. The particles are particularly good at absorbing ultra-violet rays, but make the lotion transparent and smooth instead of sticky and white. Easy clean  Pilkington coats the surface of its Activ glass with titanium oxide nano-particles. Sunshine on these special windows triggers a chemical reaction which breaks down dirt. When water hits the glass, it spreads evenly over the surface, instead of forming droplets, and runs off rapidly taking the dirt with it. Tuning tubes  Carbon nanotubes are sheets of graphite (carbon) that are rolled up on themselves. Just a few nanometres across, these ultra-strong cylinders can make composite coatings for car bumpers that better hold their shape in a crash. The tubes can also absorb hydrogen, which should enable more efficient storage of future fuels. No spots  The clothing industry uses nanotech to make stain-repellent fabrics. A chemical process during manufacture forces liquids to bead up when spilled on a garment for easy wiping away. Socks that are made with nano-silver particles give anti-microbial protection, preventing bacteria and fungus that cause itchiness and smells. Science fiction  Nuclear subs that course through the blood to shoot cancerous tumours with a laser; self-replicating nanobots that escape from a lab to devour the Earth in a "grey goo" – this is all the stuff of airport novels. The physics at this scale tells us that tiny propellers, for example, simply would not work in the way envisaged. |
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