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Micro & Nano Letters, IET

Issue 4 • Date April 2013

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Displaying Results 1 - 13 of 13
  • Flow-lysometry for cytoplasmic analysis of single cells in large populations

    Publication Year: 2013 , Page(s): 169 - 172
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (331 KB)  

    Presented is a single-cell analyser to measure cytoplasmic components in large cell populations. This technology, flow-lysometry, uses a flow-cell that performs three functions (cell detection, cell lysis and component sensing) in a continuous microfluidic channel. This flow-cell can be coupled and synchronised with classical flowcytometry, thus offering high-throughput measurements of various cytoplasmic compounds in combination with cell-surface markers. The measurement of cytoplasmic markers in the cytosol of red blood cells was shown to verify population analysis of individual cells in mixed-cell populations. This work presents an approach to characterise complex cell populations to extend measurements in cell biology. View full abstract»

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  • Comparative study of structural, mechanical and electrical properties of Ni0.8Co0.1Cu0.05Mn0.05Fe2O4 prepared from different combustion routes

    Publication Year: 2013 , Page(s): 173 - 176
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (319 KB)  

    Comparative studies on the structural, mechanical and electric properties of Ni0.8Co0.1Cu0.05Mn0.05Fe2O4 prepared by solid state combustion and solution combustion routes were studied. The X-ray diffraction patterns reveal the cubic spinel phase formation with an extra Fe2O3 phase for Ni0.8Co0.1Cu0.05Mn0.05Fe2O4 prepared by the solid state combustion method in contrast to the single cubic spinel phase formation for ferrites obtained from other routes. Scanning electron microscopic images show loosely agglomerated grains with comparatively large grain size for Ni0.8Co0.1Cu0.05Mn0.05Fe2O4 prepared by solid state combustion, whereas there are well defined grains with distinct grain boundaries and smaller grain size for solution combustion route ferrite. Micro-strains calculated from XRD show a higher value for ferrite obtained from the solution combustion method route. The Young's modulus also show higher values for ferrite prepared from solution combustion, asserting comparatively high spontaneous magnetostriction in the magnetic domains of these ferrite particles. The fourier transform infrared study reveals the octahedral and tetrahedral bond formation in the authors' ferrites prepared by both methods. Despite comparatively higher values of electric resistivity for solid combustion route ferrite, the authors' combustion route ferrite can serve as a competent phase for application in transducer or sensor devices. View full abstract»

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  • Rapid microwave-assisted synthesis of Bi2O3 tubes and photocatalytic properties for antibiotics

    Publication Year: 2013 , Page(s): 177 - 180
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (261 KB)  

    Bismuth oxide (Bi2O3) nanotubes have been successfully synthesised via a rapid microwave-assisted synthetic method for the first time. A wide range of techniques, such as X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis absorption spectroscopy and photoluminescence were applied to characterise the obtained Bi2O3 tubes. Moreover, the photocatalytic properties of Bi2O3 in the degeneration of antibiotics, especially tetracycline (TC) and ciprofloxacin (CIP), were studied. In addition, it was found that it has better photocatalytic effect in degeneration of TC compared with CIP. Therefore this study is necessary and significant for further study of Bi2O3. View full abstract»

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  • Microfabrication of cooling arm for fusion energy source application

    Publication Year: 2013 , Page(s): 181 - 183
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (262 KB)  

    The cooling arm plays an important role in the production process of fusion energy. The structure is designed with 16 fingers and is simulated by the finite-element method. The (111) crystal orientation silicon is deployed to fabricate a cooling arm, because of its isotropic Young's modulus. It can make the fingers generate a uniform force. The silicon also has a large thermal conductivity of 2400 W/mK measured by a Gifford-McMahon cooler, which contributes to heat transfer. The cooling arm is fabricated by the microfabrication process, and it has a high sidewall vertical degree of 90 ± 0.5° measured by scanning electron microscopy. The mechanical testing result shows that the maximum stress of the clamping arm was 0.209 GPa when it was in gripping state. The maximum stress is far smaller than the yield strength of 7 GPa of silicon material. View full abstract»

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  • Effect of nickel doping on the optical property and photocatalytic activity of titanium dioxide nanoparticles

    Publication Year: 2013 , Page(s): 184 - 187
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    Titanium dioxide (TiO2) nanoparticles doped with various amounts of nickel were synthesised via a sol-gel method using titanium isopropoxide and nickel nitrate hexahydrate as precursors. The structural characterisation of the nanoparticles were performed by X-ray diffraction and transmission electron microscopy. Energy dispersive X-ray and X-ray photoelectron spectroscopy analyses confirmed the incorporation of nickel ions into the TiO2 lattice. A remarkable red shift of the absorption edge was achieved by increasing the nickel content. Photoluminescence spectra indicated the quenching of emission intensity on doping. The feasibility of the photocatalytic degradation of bromophenol blue under visible light illumination was studied. The results showed that the catalytic activity is markedly increased by doping nickel ions. View full abstract»

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  • Large-scale synthesis and characterisation of Ag/Bi2Te3 superlattice nanowires via pulse electrodeposition

    Publication Year: 2013 , Page(s): 188 - 190
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (484 KB)  

    Ag/Bi2Te3 superlattice nanowire arrays have been fabricated by pulse electrodeposition using porous anodic aluminium oxide as the template at large-scale quantity. The nanowire arrays were characterised by X-ray diffraction, a scanning electron microscope, a transmission electron microscope and high-resolution transmission electron microscopy (HRTEM). The results indicate that the nanowires are composed of the Bi2Te3 rhombohedral lattice phase and the Ag cubic lattice phase with alternately ordered multi-segment characters. The feature of dark segments alternated with bright segments can be easily distinguished because of the obvious heterogeneous contrast. The length of each segment varies from 25 to 45 nm. The HRTEM result shows that the composition of one segment is Ag and the neighbouring segment is Bi2Te3. View full abstract»

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  • Development of seed layer deposition and fast copper electroplating into deep microvias for three-dimensional integration

    Publication Year: 2013 , Page(s): 191 - 192
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (159 KB)  

    Increasing demands for electronic devices with superior performance and functionality while reducing their sizes and weight has driven the semiconductor industry to develop towards three-dimensional integration using through a silicon via (TSV) copper interconnect. In this Letter, the key enabling technologies such as barrier and seed layers preparation by electron beam evaporation and copper fast-filling into deep microvias that are void-free are investigated. The deep vertical microvias filled by copper that are void-free are achieved by a multi-step electroplating process. Also, the resistance of single vertical TSVs is tested. Furthermore, the cross-sections and the scanning electron microscopy of vertical microvias are provided and examined. View full abstract»

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  • Effects of milling and subsequent heat treatment on preparation of mullite–zirconia nanocomposites

    Publication Year: 2013 , Page(s): 193 - 196
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (230 KB)  

    Mullite-zirconia composites were fabricated through reaction sintering of mechanically activated alumina and zircon powder mixtures. X-ray diffraction results showed that increasing milling time resulted in gradual weakening and broadening of alumina and zircon peaks. For the sample milled for 70 h in which there are no peaks present from zircon, heating at 1200°C resulted in the reappearance of the zircon peaks. Samples sintered at 1500°C achieved complete formation of mullite and zirconia. These samples exhibited the following physical and mechanical properties: density 3.87 g/cm3, open porosity 3.45%, hardness 11.44 ± 0.3 GPa and fracture toughness 4.7 Mpam1/2. View full abstract»

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  • Synthesis of three-dimensional porous Cu2O microspheres by template-free solvothermal method

    Publication Year: 2013 , Page(s): 197 - 200
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (639 KB)  

    Three-dimensional (3D) porous Cu2O microspheres were successfully synthesised by a simple template-free solvothermal method. Systematic studies showed that solvent, precipitator and temperature reaction parameters played a key role in controlling the morphology and structure of Cu2O. The crystallisation, morphology and composition of the as-prepared Cu2O was characterised by X-ray diffraction, a scanning electron microscope and energy-dispersive spectroscopy, respectively. It revealed that the 3D porous Cu2O microspheres were built from small 2D nanosheets with a thickness of 50-80 nm. Cyclic voltammetry was applied to investigate the electrochemical performance of the products. It was found that the 3D porous Cu2O microspheres possessed high electrocatalytic activity. The growth mechanism of the 3D porous Cu2O microspheres was proposed with a 3D molecule model. View full abstract»

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  • Fine YAG:Ce3+ nanoparticles synthesised by supercritical hydrothermal reaction

    Publication Year: 2013 , Page(s): 201 - 205
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (526 KB)  

    Yttrium aluminium garnet (YAG):Ce3+ nanoparticles have been synthesised by the supercritical hydrothermal method at 390 °C in a series of reaction times of 2, 4, 6, 8, 10 and 12 h, respectively, and characterised by X-ray diffraction, a scanning electron microscope, (high resolution) transmission electron microscopy and several measurements of fluorescence properties. The single-phase YAG:Ce3+ can be obtained at much lower temperature (390 °C) by means of the supercritical hydrothermal method with inexpensive raw materials and simple processing conditions than by the conventional solid-state method and other wet-chemical methods. The YAG:Ce3+ phosphors synthesised by the supercritical hydrothermal method exhibit more uniform size distribution and stronger emission, compared with those synthesised at the 360 °C below the supercritical point of water. The reaction time also influences the luminescent properties, and the related mechanism is discussed. View full abstract»

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  • Errata

    Publication Year: 2013 , Page(s): 206
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (25 KB)  

    Sinha, S., Chatterjee, S.K., Ghosh, J., Meikap, A.K.: 'Comparative study on the freezing temperature synthesised CdSe nanoparticles before and after annealing', Micro & Nano Letters, 8, (1), January 2013, p. 35-38 View full abstract»

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  • Variable contact surface gripping technique for microsized objects

    Publication Year: 2013 , Page(s): 207 - 210
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (271 KB)  

    A special approach is presented regarding an ice-gripping technique for microsized objects, from the initial idea to the test result. This approach uses water vapour under its triple point for ice forming when gripping or releasing the object. These conditions eliminate liquid water and cause deposition and sublimation to occur. The cooling of sharp apex tips is made possible in this way and eliminates great surface tension of liquid water that makes releasing difficult. The experimental setup and its components are described. It has been shown that this principle is capable of gripping, moving and releasing objects of 40 μm in size, requires no external intervention (such as electron beam-induced deposition) for releasing the object, is very simple and cost-effective and is shape and orientation insensitive. View full abstract»

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  • Al-doped ZnS thin films for buffer layers of solar cells prepared by chemical bath deposition

    Publication Year: 2013 , Page(s): 211 - 214
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (383 KB)  

    In this reported study, Al-doped ZnS (ZnS:Al) thin films were fabricated by chemical bath deposition in alkaline condition along with a stable complexing agent of sodium citrate in ammonia/ammonium chloride buffer solution. Al concentrations were varied from 0 to 10 at.%. The structure and composition of the films were confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectra and Raman spectroscopy. The XRD, FTIR and Raman spectra confirmed the existence of ZnS and Al-S bond, which had some effects on the properties of the films. The optical characteristics indicated the changes of the bandgap with the Al-doping concentrations. The resistivity of the ZnS:Al films with different Al-doping concentrations after annealing was analysed and the sample with 6 at.% Al concentration had the lowest resistivity of 9.9 × 104 Ω cm. 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