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Micro & Nano Letters, IET

Issue 2 • Date February 2011

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Displaying Results 1 - 10 of 10
  • Mass-loading effect on quality factor of floppy silicon microcantilever in free air space

    Publication Year: 2011 , Page(s): 62 - 65
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (232 KB)  

    The floppy microcantilever usually exhibits a low quality factor in free air space, because of air damping. Here, the authors present an approach to enhance the quality factor through adding a mass at the free end of the microcantilever. The mass loading effect is theoretically investigated and experimentally validated. Based on the theory, the quality factor of the mass-loaded microcantilever is proportional to (mcan+m)1/2, where mcan is the effective mass of the microcantilever and Δm is the added concentrated mass. In the experiments, the silicone grease is added as the mass on a 465 × 10 × 0.85 × μm3 microcantilever by a micropositioner. Typically, the quality factor is demonstrated increasing from 7.25 to 19.07, when the added mass is 22.82 ng. The mass loading size effect on the quality factor in the experiments has also been discussed. The discipline investigated here is meaningful for the contour design of the microcantilever used in air. View full abstract»

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  • Kinetic resistance of carbon nanotubes in aqueous solution

    Publication Year: 2011 , Page(s): 66 - 69
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (321 KB)  

    By using the molecular dynamics (MD) method, the deceleration of (5,5), (7,7), (10,10) and (5,5)/(10,10) carbon nanotubes is first simulated in aqueous solution; their curves of resistance/velocity and resistance/Reynolds (Re) number are also obtained; then the MD results are compared with the macroscopic fluid dynamics (FD) ones of circular cylinder in aqueous solution for low Re numbers. It is shown that, in aqueous solution, the kinetic resistance of the carbon tubes only rests with their Re number, that, under the low Re numbers, the resistance of the carbon tubes in aqueous solution is higher than the macroscopic FD results by several ten times, and that the kinetic resistance of carbon tubes can be estimated through the macroscopic FD results multiplied by (17.17/0.19 Re). View full abstract»

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  • Sustained-release polylactide-co-glycolide microspheres loaded with pre-formulated protein polysaccharide nanoparticles

    Publication Year: 2011 , Page(s): 70 - 74
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (398 KB)  

    Protein-loaded dextran nanoparticles were prepared by the method of freezing-induced phase separation. The average diameter of protein-loaded dextran nanoparticles prepared using this method was between 100 and 300 nm. The protein-loaded dextran nanoparticles were then microencapsulated into polylactide-co-glycolide acid (PLGA) microspheres by the solid-in-oil-in-water (S O W) multiple emulsion technique. The release behaviour of the microspheres showed that the method might improve the release profile and bioactivity in vitro, and also reduce initial burst and aggregation. The method will be potentially developed to solve protein-controlled release problems. View full abstract»

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  • Single electron fault modelling in quantum binary wire

    Publication Year: 2011 , Page(s): 75 - 77
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (148 KB)  

    Quantum cellular automata (QCA) represents an emerging technology at the nanotechnology level. There are various faults that may occur in QCA cells. One of these faults is the single electron fault that can happen during manufacturing or the operation of QCA circuits. The behaviour of the single electron fault in QCA devices is not similar to either previously investigated faults or conventional CMOS logic. A detailed simulation-based logic level modelling of the single electron fault for QCA binary wire is represented in this study. Results show that if a single electron fault occurs in a binary wire, then the logic value of that wire will be inverted. View full abstract»

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  • Titania shells with single crystallites layer thickness and the photocatalysis properties

    Publication Year: 2011 , Page(s): 78 - 81
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (310 KB)  

    TiO2 shells comprised of single-layer nanocrystallites were synthesised using sulphonated polystyrene (SPS) nanospheres as hard templates. The assembling of titania gel-based particles during the hydrolysation process caused the formation of SPS-titania gel core-shell spheres, the dissolution of SPS and the condensation process by calcination resulting in single-layer crystallites-connected TiO2 shells with a rough surface. The prepared TiO2 shells showed considerable photocatalytic activity on the degradation of Rhodamine B. View full abstract»

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  • Facile synthesis of Ag-Fe2O3 core-shell composite nanoparticles by an in situ method

    Publication Year: 2011 , Page(s): 82 - 85
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (321 KB)  

    A new synthetic method of Ag-Fe2O3 core-shell composite nanoparticles is reported. The silver nanoparticles used as the seeds was synthesised by an in situ method in the presence of p-toluenesulfonic acid-doped polyaniline. Then the Fe2O3 was coated on the surface of silver nanoparticles in the dimethylformamide solution. The core-shell structure of Ag-Fe2O3 composite nanoparticles was confirmed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and UV-vis spectroscopy. The result showed that the average size of the Ag core and average thinkness of the Fe2O3 shell are 38.0 and 5.5 nm, respectively. It provides an opportunity to synthesise other core shell (Fe2O3) nanoparticles by one experiment. View full abstract»

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  • Synthesis of aluminium oxide nanoflakes on hollow periphery by hydrothermal coating using electrospun poly(acrylnitrile) nanofibres template

    Publication Year: 2011 , Page(s): 86 - 89
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (426 KB)  

    The authors report on one-dimensional (1D) aluminium oxide (Al2O3) nanoflakes fabrication on hollow periphery by using a simple hydrothermal corrosion method on the aluminium foil. The authors used the electrospun poly(acrylnitrile) (PAN) nanofibres as a template on aluminium foil to obtain 1D Al2O3 nanoflakes structure. Two important experimental parameters were governed in forming the 1D Al2O3 nanoflakes; first the temperature and second the duration of the heating time. Field emission scanning electron microscopy image revealed that the formation of Al2O3 nanoflakes structure coated on the hollow periphery. Based on experimental findings, the authors propose a possible mechanism for the formation of Al2O3 nanoflakes on electrospun PAN nanofibres with and without aluminium foil substrates. View full abstract»

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  • Sodium chloride assisted synthesis of silver nanowires

    Publication Year: 2011 , Page(s): 90 - 93
    Cited by:  Patents (4)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (321 KB)  

    Silver nanowires with diameters of about 100 nm and lengths up to several micrometres have been synthesised by a developed polyol process with the assistance of polyvinyl pyrrolidone (PVP) and sodium chloride (NaCl) on a large scale. Transmission electron microscopy, high-resolution transmission electron microscopy, selected areas electron diffraction and X-ray diffraction have been employed to characterise silver nanowires. The role of NaCl for the formation of silver nanowires has been discussed by taking into account the formation of silver chloride (AgCl) to consume silver ions and reduce the rate of nucleation. View full abstract»

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  • Investigation of a turnstile nanoantenna

    Publication Year: 2011 , Page(s): 94 - 97
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (382 KB)  

    Dipole and bowtie are two downscale versions of electromagnetic antenna studies in the optical frequencies by using plasmonic resonances. The bowtie antennas produce a lower near-field enhancement in their feedgaps compared to the single-mode dipole antenna and besides they exhibit several resonances. However, in both the antennas, field intensity enhancement is sensitive to polarisation of incident field. In this study, the authors report the implementation of a cross nanoantenna (CNA) consisting of two orthogonal dipole nanoantennas (DNAs) with a common feedgap, investigate its directional and polarisation properties, and compare them with those of the DNA. The response of CNA is found to be independent of polarisation. Besides, the authors demonstrate that the CNA could be operated in turnstile mode, which draws useful analogies between classical electromagnetics and nanophotonics. To their knowledge this is the first proposal of a turnstile antenna in optical frequency. They believe, the polarisation-independent omnidirectional behaviour of CNA could open up new possibilities for studying the novel phenomenon of light-matter interaction. View full abstract»

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  • Synthesis, photoluminescence and adsorption of Cu-doped hydrogen titanates nanotubes

    Publication Year: 2011 , Page(s): 98 - 101
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (336 KB)  

    The Cu-doped hydrogen titanates nanotubes were prepared by hydrothermal process and subsequently ion-exchange reactions. The products were characterised in detail by multiform techniques: X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. These tubes are hollow scrolls with a typical outer diameter of 10-12-nm, inner diameter of about 6-nm and length of several hundreds nanometres. The photoluminescence and the adsorption properties of Cu-doped hydrogen titanates nanotubes have been systematically investigated. View full abstract»

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Aims & Scope

Micro & Nano Letters offers express publication of short research papers presenting research conducted at the forefront of micro- and nanoscale science, engineering and technology, with at least one dimension ranging from a few tens of micrometres to a few nanometres.

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Meet Our Editors

Editors-in-Chief
Professor Gwo-Bin Vincent Lee
National Tsing-Hua University, Taiwan

Professor Peter Dobson
University of Oxford, UK