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Micro & Nano Letters, IET

Issue 3 • Date March 2012

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Displaying Results 1 - 25 of 26
  • Functionalisation of nylon with carbon nanotubes to make thermally stable fabric and wearable capacitor

    Page(s): 193 - 195
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (237 KB)  

    Single-walled carbon nanotubes (SWCNT) are dispersed in water and attached to nylon fabric by a simple immersing-drying procedure, which is evidenced by data obtained using Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. Thermalgravimetric analysis reveals the temperature at which the functionalised nylon fabric reaches its maximum weight loss rate increases about 10oC with respect to the pristine nylon. This improvement in thermal oxidation stability can be ascribed to the strong free-radical accepting capacity of nanotubes and their high thermal conductivity. The SWCNT functionalised nylon is then used to make a capacitor structure, which possesses the merits of being lightweight, little hysteresis and low power dissipation. View full abstract»

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  • Preparation and characterisation of hyaluronan microspheres by electrostatic field system and ultrasound atomisation system

    Page(s): 196 - 199
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (305 KB)  

    Two simple in situ methods, involving the injection of a hyaluronan (HA) solution through a pair of hollow-centred parallel disc electrodes of an electrostatic field system and a micronozzle transducer of an ultrasound atomisation system, were developed and used to prepare HA microspheres in watery phase. The HA microspheres were treated by FeCl3 and 1-ethyl-3-(3-dimethyl aminopropyl) carbodimide (EDC) to secure the spherical structure shape. Depending on certain treatment conditions, the resulting series of HA microspheres exhibited good sphericity in the range of 317±22 to 579±49±±m in diameter by the electrostatic field system. Stricter conditions were needed to produce HA microspheres by the ultrasound atomisation system because of a viscosity restriction of micronozzle transducer. However, the HA microspheres could be produced and exhibited good sphericity in a smaller size under certain HA concentrations conditions. These prepared HA microspheres had various mechanical durability and could maintain their particulate shape after intra-articular administration of HA microspheres into a rabbit articular cavity for an 11-day period. View full abstract»

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  • Facile fabrication of UV photodetector based on spatial network of tetrapod ZnO nanostructures

    Page(s): 200 - 203
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (256 KB)  

    A highly sensitive UV photodetector based on a spatial network of tetrapod ZnO nanostructures was fabricated by a new simple and cost-effective method. The device showed a drastic and fast response to UV illumination in atmosphere at room temperature, but no response to visible light. The photocurrent and dark current contrast ratio is up to approximately six orders of magnitude at an applied bias of 1 V. The photoresponse mechanism is also analysed and discussed. The proposed approach provides a facile and effective way to fabricate high- performance photodetector or other nanodevices. View full abstract»

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  • Fabrication of superhydrophobic surfaces with hierarchical rough structures on Mg alloy substrates via chemical corrosion method

    Page(s): 204 - 207
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (394 KB)  

    Superhydrophobic surfaces are commonly fabricated by a combination of hierarchical rough structures and low surface energy materials. The hierarchical rough structures of micrometre-scale lump-like structures and sub-micrometre-scale concave-convex structures were firstly and directly fabricated on the surfaces of magnesium (Mg) alloy plates by a simple chemical corrosion. Then, chemical modification with fluoroalkylsilane (FAS) and stearic acid was employed to decrease surface energy. Effect of the composition of chemical corrosive solution on the surface morphology was also studied. Results show that a good superhydrophobic surface on Mg alloy substrates with a 163.4° static water contact angle and 8- rolling angle was obtained via chemical corrosion and FAS modification. The chemicals NiSO4 and NaH2PO2 are both essential to fabricate the hierarchical rough structures needed by the superhydrophobic surfaces. View full abstract»

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  • Comparison between the experimental and theoretical electrochemical impedance for microcrystalline and nanocrystalline copper immersed in near neutral chloride solution

    Page(s): 208 - 211
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (226 KB)  

    The electrochemical impedance of an electrode is one of the important characteristics of materials surface. This work aims to study the corrosion resistance of microcrystalline and nanocrystalline copper using electrochemical impedance spectroscopy (EIS); plus, a mathematical model was developed to investigate the diffusion process in the chloride solution. The obtained impedances by the mathematical model were in agreement with the experimental data trend. Furthermore, the electrochemical impedance ratio between theoretical and experimental impedance for microcrystalline and nanocrystalline copper was 0.8 and 0.76, respectively. Assuming only diffusion term in the theoretical model, appropriate solution of electrochemical behaviour in the corrosive solution was obtained. In addition, electrochemical impedance obtained for the nanocrystalline copper was higher than its microcrystalline counterpart. It was related to the higher adsorption of grain boundaries in the nanocrystalline state. Adsorption of ions could hinder the charge transfer mechanism and therefore the corrosion rate becomes lower than the microcrystalline state. View full abstract»

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  • Rapid route for synthesis of nano-TiO2 termed graded calcination

    Page(s): 212 - 214
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (245 KB)  

    To work out the problem of having excessive gelatinising time in the sol-gel method, nano-TiO2 was prepared through an original approach termed as graded calcination method. The results indicated that the gelatinising time has been shortened from 14-20-days to 6-h as the preparation method changed from the conventional sol-gel way to the new process. Analyses of X-ray diffraction indicate that the TiO2 sample from graded calcination method shows as a complete anatase. The grain size is much smaller and uniformer, and the lattice distortion and specific surface area are both promoted by the new method. TiO2 prepared by graded calcination has better absorption capacity in both UV and visible region, and its photocatalytic activity is better than TiO2 sample made from sol-gel method. View full abstract»

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  • Stabilisation and encapsulation of protein into biodegradable microspheres with zinc ion and protein in polyethylene glycol solution formed nanoparticles by freeze-drying

    Page(s): 215 - 218
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (169 KB)  

    The sustained-release formulation of protein has several unsolved problems, including the burst release and/or incomplete release of protein and the instability of protein during the preparation process. This study was conducted to find a way out in decreasing the burst release and incomplete release of protein as well as stabilising the protein. The method was to apply the solid-in-oil-in-water (S/O/W) encapsulation process. The different stabilising effects achieved by varying the proportion of zinc ion (Zn2+), protein and polyethylene glycol (PEG) during the preparation of Zn2+-bovine serum albumin (BSA) nanoparticles in PEG solution were investigated followed by the investigation of freeze-drying and subsequently encapsulating the nanoparticles mentioned above into polylactide-co-glycolide (PLGA) microspheres using the S-O-W method. The size-exclusion high-performance liquid chromatography results showed that the aggregation of protein released from the PLGA microspheres did not change significantly compared with that of the original BSA solution. The in vitro release results showed that burst release and incomplete release might be controlled through changing the proportion of zinc ion, protein and PEG in PLGA. View full abstract»

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  • Optical and magnetic properties of γ-Fe2O3 nanoparticles encapsulated in SBA-15 fabricated by double solvent technique

    Page(s): 219 - 222
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    The double solvent method was employed to prepare γ-Fe2O3 nanoparticles encapsulated in mesoporous silica (γ-Fe2O3/SBA-15). The as-synthesised γ-Fe2O3/SBA-15 samples were studied by means of X-ray diffraction, Fourier transform infrared, transmission electron microscopy, N2 adsorption porosimetry, UV-vis absorption spectra and vibrating sample magnetometer (VSM). The γ-Fe2O3/SBA-15 nanocomposite keeps the ordered hexagonal mesoporous structure of SBA-15. With the iron concentration decreasing, the particle size of samples decreased, and the optical absorption edges showed a blue shift. VSM results indicate that the as-obtained nanocomposites exhibit superparamagnetic behaviour. View full abstract»

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  • Experimental analysis of turbulent convective heat transfer and pressure drop of AI2o3/water nanofluid in horizontal tube

    Page(s): 223 - 227
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (365 KB)  

    Turbulent flow convective heat transfer and friction factor characteristics of Al2O3/water nanofluid flowing inside a uniformly heated horizontal circular tube are conducted in this Letter. To do this, Al2O3 nanoparticles of 40 nm size were characterised and dispersed in distilled water to form stable suspension containing 0.1, 0.5, 1.0, 1.5 and 2.0 volume concentrations of nanofluids. Results indicate that heat transfer coefficients increase with nanofluid volume concentration and do not change with Reynolds number. The enhancement of the Nusselt number is about 22 at Re 13 500 using 2 alumina nanoparticles compared to distilled water. Experimental results are also compared with the existing correlations of convective heat transfer coefficient and pressure drop in turbulent regime. The measured pressure loss when using nanofluids is almost equal to that of the base fluid. View full abstract»

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  • Synthesis and properties study of new rare earth sodium borates Eu3+-doped Na3Y(BO3)2

    Page(s): 228 - 231
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (279 KB)  

    The samples of ultraviolet (UV)-excited Eu3+-doped Na3Y(BO3)2 phosphor with different reaction temperatures and various concentrations of Eu3+ ions content are synthesised and their photoluminescence (PL) properties are investigated. It is found that the optimal reaction temperature and Eu3+-doped concentration are 800°C and 12.5°, respectively. The phosphor not only has stronger UV PL intensity but also shows excellent chromaticity and broader range of characteristic emission wavelength. Furthermore, a new phenomenon is observed. By altering the reaction temperatures, the peak positions of the highest intensity are divided into two types, which is due to the competition between two kinds of emission, resulting from the split of 5D0 level. View full abstract»

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  • Breakdown voltage curves in direct current discharges in molecular gases at microgaps

    Page(s): 232 - 234
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (335 KB)  

    This Letter reports on experimental studies of the direct current breakdown voltage curves in oxygen, dry air, nitrogen and hydrogen discharges with parallel-plane electrodes separated from 1 to 100 μm. For the gaps sizes greater than 5 μm, the obtained breakdown voltage curves exhibit U-shaped form and follows the Paschen law. For the gaps less than 5 μm, however, in the left-hand side the curves show departure from the standard scaling law. To the author s knowledge, there is no data for the breakdown voltage in microgaps for some of the considered molecular gases. Owing to the lack of experimental data in microgaps, measured data represent basic design data of high voltage equipment. View full abstract»

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  • Formation of porous and dense Pt/C catalyst films using electrohydrodynamic atomisation deposition

    Page(s): 235 - 239
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (374 KB)  

    In this Letter, electrohydrodynamic atomisation (EHDA) was used to spray deposit Pt/C catalyst films using a Pt/C nanosuspension. In stable cone-jet atomisation mode, the influence of flow rate on the characteristics of relics and films was analysed. At a lower flow rate smaller size and lower number density of relics were predominant, which led to the formation of porous films; conversely, higher flow rate generated dense films. The size of the relics in experimental results and theoretically predicted size were compared and analysed. The dispersive X-ray analysis confirms that the EHDA deposited films are Pt/C. View full abstract»

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  • Analyses of reinforcing effects of in situ grown CNTs on carbon fibre fabric/epoxy composites at micro- and macroscale

    Page(s): 240 - 243
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (300 KB)  

    Carbon nanotubes (CNTs) have been in situ grown on the surface of carbon fibre fabric (CFF) by electrochemical oxidation, urea hydrolysis and chemical vapour deposition process. The reinforcing efficiency of the in situ grown CNTs (I-CNTs) was analysed at micro- and macroscale by atomic force microscopy (AFM), single fibre pull out tests and mechanical properties of I-CNTs reinforced CFF/epoxy composites. AFM analyses indicated that the bonding strength between a single piece of I-CNTs and carbon fibre (CF) was ~50~700~nN, which was much higher than that between CF and CNTs on the surface of CF adsorbed in CNTs suspension. Further investigation of single fibre pull out tests showed that the interfacial bonding strength between CF with I-CNTs and epoxy resin was 39~ higher than that between pristine CF and epoxy resin. Correspondingly, the bending strength and interlaminar shear strength of I-CNTs/CFF/epoxy were 26 and 52~ higher than those without reinforcement of I-CNTs. The significant improvement could be ascribed to the high strength of uniformly dispersed I-CNTs themselves, high bonding force between I-CNTs and CF, and improved interfacial bonding strength between the reinforcers and matrix. View full abstract»

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  • Using UV roll-to-plate imprint lithography to fabricate light guide plates with microdot patterns

    Page(s): 244 - 247
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (477 KB)  

    Conventional methods used to fabricate the light guide plates (LGPs), such as injection molding and hot embossing, are difficult and unsuitable. In this study, the authors propose a new manufacturing process for the roll-to-plate UV imprint lithography (RPIL) technique that fabricates LGPs with dot patterns. A flexible and transparent sheet mold with microstructures required by the RPIL machine replicated from an LGP made from injection molding used in the RPIL process will be described. The study describes the RPIL machine equipped with an automatic release mechanism, roller, UV light source and loading system. With the RPIL process, a replica LGP was successfully fabricated and experimental results demonstrate the excellent optical properties of proposed device. These results demonstrate the potential of this process for the fabrication of thin LGPs with microstructures. View full abstract»

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  • Preparation and characterisation of nano-ATO colloid suspension

    Page(s): 248 - 251
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (371 KB)  

    Colloidal processing has been proved to be an ideal technology for nanopowder dispersion and to be an effective way to disperse nanopowders such as TiO2, ZnO, CaCO3, Cu, TiN, and so on. Few reports that are focused on the dispersion of nano-scaled ATO powder in aqueous media. In this Letter, the nano-ATO colloid suspension was prepared with colloidal processing. Nano-ATO powders were treated in aqueous media with ultrasonic wave and γ-methacryloxypropyl trimethoxy silane (MTS) was added as the coupling agent. The plausible modified mechanism of the silane coupling agent involves the hydrolysis of MTS, condensation of hydrolysis product and formation of a covalent bond, which is confirmed by Fourier transform infrared. Factors that affect the stability of nano-ATO colloid suspension were investigated in detail. Results show that the well-dispersed nano-ATO colloid suspension can be obtained under the following optimum conditions: the ultrasonication time is 30 min; pH of the colloid suspension is controlled at 7.0; the amount of MTS is 5.0%; the reaction temperature is 60°C. The particle size of nano-ATO colloid suspension is 65.2 nm and its distribution is unimodal distribution, which is further confirmed with transmission electron microscopy. View full abstract»

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  • Optical characteristics of an Al/nano-SiO2/n-type Si MOS photodetector by using spin-coating deposited oxide

    Page(s): 252 - 255
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (386 KB)  

    Nano-silicon dioxide (SiO2) has been deposited on an n-type silicon substrate using the spin-coating method and Al/nano-SiO2/n-Si MOS photodetectors have been fabricated to characterise their optical properties using current-voltage (I-V) measurements. Field emission scanning electron microscope (FESEM) shows the spin oxide with grain size ranging from 25 to 30 nm, demonstrating the sol gel method to be homogeneous in grain size. The ratio of photo to dark current was 25.3 and 9.1 for the wavelength of 632 and 850 nm, respectively, for the MOS detector under negative gate with six voltages. The quantum efficiency was obtained as 76.1 and 74.8 for the wavelength 632 and 850 nm, respectively. These results suggest that a suitable spin-coating technology for the fabrication of the MOS tunnelling diode can be achieved. View full abstract»

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  • Characterisation and evaluation of self-microemulsifying drug delivery system of brucea javanica oil

    Page(s): 256 - 261
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (240 KB)  

    A self-microemulsifying drug delivery system (SMEDDS) of Brucea javanica oil (BJO) was developed and evaluated for its oral absorption and bioavailability. Based on a solubility study and pseudo-ternary phase diagrams, the self-microemulsifying formulation composed of BJO, Cremorphor RH40, Plurol Oleique CC 497 and glycerol (30/42/20/8, % w/w) was prepared and characterised, including particle size, morphology, in vitro cytotoxicity and in vivo anti-tumour effects. The mean diameter of the final formulation was 41.5±3.5±nm. The BJO-loaded SMEDDS (BJOS) and the control preparation of BJO were administered orally to beagle dogs for pharmacokinetics and bioavailability studies. Oleic acid, which was considered as the main active and indicative component in BJO, was determined by gas chromatography. The cytotoxicity and anti-tumour effects of BJOS were evaluated in SMMC-7721 and BGC-823 cancer cell lines and sarcoma 180-bearing mice. The data showed that the oral relative bioavailability of commercial emulsion of BJO (BJOE) was 2.3-fold higher than that of BJO. Moreover, the IC50 value of BJOS group was nearly one-fourth compared to that of commercial BJOE. BJOS could significantly inhibit tumour growth via intra-gastric administration. The Letter illustrates that the developed SMEDDS formulation possessed great potential to be an alternative for traditional oral formulations of BJO. View full abstract»

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  • Electrode deterioration processes in lithium ion capacitors monitored by in situ X-ray radiography on micrometre scale

    Page(s): 262 - 264
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (278 KB)  

    Gas bubble formation and the related mechanical and chemical deterioration of electrodes are processes limiting performance and lifetime of lithium ion capacitors and batteries. Moreover, the increase of internal pressure caused by gas formation constitutes a severe safety problem. The authors were able to monitor the degradation process of capacitor cells for the first time by in situ synchrotron and laboratory X-ray radiography in through-plane and in-plane geometry with high optical resolution of 1-5--m. The decomposition is found to be dependent only on the electrolyte system but not on the applied voltage, current or the state of charge. The standard electrolyte system for lithium ion batteries is a solution of LiPF6 in a mixture of ethylene carbonate and dimethyl carbonate (EC/DMC) and leads to bubble formation because of decarboxylation, increase of internal pressure, material ablation and particle migration on the cathode layer, as could be shown by radiography studies on working capacitor cells. As an alternative, the scarcely studied electrolyte system LiBF4 in N,N-dimethylformamide (DMF) shows a good performance and high chemical stability even at high charge voltages. View full abstract»

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  • Fabrication of carbons dendritic hierarchical structure via easy copper substrateinduced solvothermal process at low temperature

    Page(s): 265 - 267
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (190 KB)  

    Three-dimensional hierarchical dendritic carbon structures with high densities of secondary carbon nanosheets have been fabricated using a solvothermal growth via reacting metal Na with tetrachloromethane in 200°C on Cu ribbon. Field-emission scanning electron microscopy and transmission electron microscopy images of the as-prepared sample shows that 3D hierarchical dendritic carbon structures are composed of carbon nanosheets with the thickness of about 20°nm. The powder X-ray diffraction and Raman spectra reveal the low graphitisation degree of the as-prepared sample. A possible formation mechanism has been proposed. View full abstract»

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  • Luminescence properties of micro Ca3Al2O6:Dy3+ phosphor

    Page(s): 268 - 270
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    This Letter reports the synthesis of Dy3+ ions-doped Ca3Al2O6 phosphor by combustion method. The prepared Ca3Al2O6:Dy3+ phosphors were characterised by X-ray diffraction, CIE colour coordinates, scanning electron microscope and photoluminescence spectroscopy. The characteristic intra-configurational 4f emissions of Dy3+ were observed in the emission spectra. The combination of the 485 nm blue emission corresponding to the 4F9/26H15/2 transition and the 577 nm yellow emission corresponding to the 4F9/26H13/2 transition yielded white light emission. The concentration quenching effect for Dy3+ was found at the optimum doping concentration of 0.5 mole . An average crystallite size is in the micrometer range. The CIE colour co-ordinates of Ca3Al2O6:Dy3+ are suitable as white light-emitting phosphors. The obtained results show that the phosphors have the potential for application in solid state lighting. View full abstract»

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  • Fe- and Fe3C-filled carbon nanotube-aligned arrays and flower-like carbon nanostructured clusters with a high coercivity

    Page(s): 271 - 274
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (362 KB)  

    Fe- and Fe3C-filled carbon nanostructures were synthesised by simply catalytically pyrolysing ferrocene and acetonitrile. The novel hybrid structures fabricated were thoroughly characterised by X-ray diffraction, scanning and transmission electron microscopy, electron energy loss spectroscopy, Raman spectroscopy and magnetic measurement. Aligned arrays of Fe- and Fe3C-filled carbon nanotubes (CNTs) and flower-like Fe3C-filled N-doped multi-branched CNTs clusters were revealed. High coercivity of 670 Oe for the flower-like nanostructures was observed, and the possible mechanism for coercivity enhancement was discussed. View full abstract»

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  • Effect of interface roughness and polarisation on the optical losses of porous silicon-based waveguides

    Page(s): 275 - 278
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    Optical losses measurements were performed at 1550 nm on both porous silicon (PSi) and oxidised PSi (OPSi) planar waveguides as a function of interface roughness. The PSi waveguides were produced at different anodisation temperatures to reduce the interface roughness. The authors noticed a decrease in optical losses with the diminution of roughness. The lowest value of optical losses was equal to 0.5 dB/cm and obtained for OPSi waveguide with a 10 nm interface roughness and anodisation temperature equal to 20 C. The surface scattering losses were modelled. There is a good agreement between the theoretical and experimental values. The optical losses were also carried out in transverse electric (TE) and transverse magnetic (TM) polarisations for both PSi and oxidised OPSi waveguides. View full abstract»

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  • Amplitude response of a unilaterally constrained nonlinear micromechanical resonator

    Page(s): 279 - 282
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (246 KB)  

    Dynamical systems that involve impacts frequently arise in engineering. This Letter reports a study of such a system at microscale that consists of a nonlinear resonator operating with an unilateral impact. The microresonators were fabricated on silicon-on-insulator wafers by using a one-mask process and then characterised by using the capacitively driving and sensing method. Numerical results concerning the dynamics of this vibro-impact system were verified by the experiments. Bifurcation analysis was used to provide a qualitative scenario of the system steady-state solutions as a function of both the amplitude and the frequency of the external driving sinusoidal voltage. The results show that the amplitude of resonant peak is levelled off owing to the impact effect and that the bandwidth of impacting is dependent upon the nonlinearity and the operating conditions. View full abstract»

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  • Simple and facile synthesis of Ag2CrO4 and Ag2Cr2O7 micro/nanostructures using a silver precursor

    Page(s): 283 - 286
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    In this work, Ag2CrO4 and Ag2Cr2O7 micro/nanostructures have been successfully produced via a simple precipitation route using silver salicylate, [Ag(HSal)], as a new synthesis technique. Besides, the effect of silver precursor and surfactant concentration on the morphology of products was studied by scanning electron microscopy (SEM) images. SEM images showed that particle-like powders with particle size of 500-700-nm and capsule-like nanostructures of Ag2CrO4 have been produced using AgNO3 and [Ag(HSal)], respectively. In several experiments to decrease the particle size of products, sodium dodecyl sulphate (SDS) was applied as a surfactant. The products were characterised using various methods. The presented method is a simple and facile route to fabricate Ag2CrO4 and Ag2Cr2O7 micro/nanostructures because there are many advantages, such as saving time and energy, free organic solvent, using cheap available chemicals and high yield. View full abstract»

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  • Hollow YPO4:Eu3+ microspheres: synthesis, characterisation and luminescent properties

    Page(s): 287 - 291
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (292 KB)  

    YPO4:Eu3+ hollow microspheres were synthesised by using the spheres of PS/Y(OH)CO3:Eu3+ as a precursor. The whole process mainly consists of the hydrothermal reaction and calcination. The YPO4:Eu3+ hollow spheres were characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence. The formation mechanism was also investigated. The obtained YPO4:Eu3+ hollow spheres may have potential applications in cell biology, drug release and diagnosis, because of high chemical stability and luminescence functionality. 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.

Full Aims & Scope

Meet Our Editors

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

Professor Peter Dobson
University of Oxford, UK