Suspended micro resonator fabrication: atomic layer deposition

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The recent decision by ITER to move from a Be to a W first wall has significant implications for material transport and deposition, and can be expected to lead to increased W layer growth rate in deposition regions, which may flake leading to plasma disruption. In this work a novel sputtering set-up was implemented in the Magnum-PSI linear plasma device to create W layers under ITER relevant conditions. A W plate was inserted into the plasma edge and biased to cause sputtering of W in an Ar plasma. This spu

Mercury is a persistent environmental pollutant with strong impacts in polar regions, where atmospheric oxidation and subsequent deposition drive ecosystem loading and human exposure via methylmercury bioaccumulation. However, atmospheric mercury chemistry remains poorly constrained because gaseous oxidized mercury (Hg(II)) has rarely been resolved at the molecular level under ambient conditions. Most field observations rely on hours-to-days preconcentration techniques that provide limited speciation and ar

Neglecting the case of cable-stayed bridges, bridge steel girders are mainly subject to bending and shear, not so much to axial forces. What is more, these girders are usually built-up cross-sections with a very large web slenderness ratio, often exceeding 100. In this case, one major aspect of structural safety is the local buckling resistance under shear loading of the web. Moreover, it has been shown that the primary enemy to sustainability of steel structures is corrosion which arises from the material’

We might be at the turning point where research in microfluidics undertaken in academia and industrial research laboratories, and substantially sponsored by public grants, may provide a range of portable and networked diagnostic devices. In this Progress Report, an overview on microfluidic devices that may become the next generation of point-of-care (POC) diagnostics is provided. First, we describe gaps and opportunities in medical diagnostics and how microfluidics can address these gaps using the example o

The cost-effective production of high-performance and durable steel reinforced thermoplastic composites requires improvement of the adhesion encountered at the interface between metallic substrates (galvanized steel) and a thermoplastic elastomer (TPU). Combined requirements of processing speed, adhesion and durability were assessed by using cationic photo-polymerized coatings at the TPU-metal interface. The adhesion was studied by pull-out tests on co-molded TPU matrix - galvanized steel wires samples befo

In this paper we report work on a modified potassium sodium niobate composition that has the potential to replace PZT for piezoelectric thin film applications. Pulsed laser depositions were undertaken on platinised Si substrates. The resultant films were found to be well-oriented in the [100] direction and almost phase-pure. TEM analysis of film cross-sections revealed the grain structure to be highly columnar. Values for P-s = 3.8 mu C/cm(2) and E-c = 20 kV/cm were derived from polarisation hysteresis meas

For self-consistent ICRF heating simulations, four codes have been coupled: VMEC[1] provides a fully shaped, anisotropic 3D MHD equilibrium (bi- Maxwellian distribution function), transferred to Boozer coordinates by TERPSICHORE[2]. The full-wave code LEMan[3,4] provides the IC wave field, power deposition and wave numbers (new anisotropic dielectric tensor and upshifted k). Finally, VENUS[5,6] computes the evolution of the distribution function due to ICRF heating and Coulomb collisions on the background t

Piezoresistive sensors based on steel and other metallic substrates provide higher strain response than on standard ceramic substrates and are more easily packaged. But exposing high-strength steels to the standard high- temperature 850°C thick-film firing cycle affects their mechanical properties. In previous studies, we have developed a range of low-firing thick-film materials based on lead borosilicate glass, which allows processing at low temperatures. However, it is desirable to develop alternatives to

Four of the 16 ITER upper port plugs will be devoted to electron cyclotron resonance heating (ECRH) in order to control the magneto-hydrodynamic (MHD) instabilities. In order to achieve the stabilisation of the neoclassical tearing modes (NTM) and sawtooth oscillation, a deposition of a very localized and peaked current density profile over a broad poloidal steering range is required. In the present optical configuration eight 2MW mm-wave beams enter each of the four upper launchers (UL) through waveguides

Light Induced Chemical Vapour Deposition (LICVD) of titanium dioxide thin films is studied in this work. It is shown that this technique enables to deposit locally and selectively a chosen crystalline phase with a precise controlled thickness at low substrate temperature, allowing even the use of polymer substrates. A home made LICVD reactor was set up, consisting of a main chamber in which the substrate was placed on a temperature controlled plate and could be irradiated perpendicularly through a window by

Two methods were used for the deposition of Pt particles on synthetic B-doped diamond (BDD) surfaces: chem. deposition and electrodeposition under potentiostatic conditions. However, electrodeposition leads much higher Pt dispersion than chem. deposition. The mechanism of nucleation and growing of the electrodeposited Pt was studied by chronoamperometric studies in acid medium. The electrodeposition on diamond surfaces shows a mechanism of progressive nucleation as deduced from the chronoamperometric studie

Designing plasma-enhanced chemical vapour deposition (PECVD) reactors to coat large-area glass plates (similar to1 m(2)) for flat panel display or solar cell manufacturing raises challenging issues in physics and chemistry as well as mechanical, thermal, and electrical engineering, and material science. In such reactive glow discharge plasma slabs, excited at RF frequency (from 13.56 MHz up to similar to 100 MHz), the thin-film deposition uniformity is determined by the gas flow distribution, as well as the

We introduce two new low temperature bonding technologies for the assembly of microstructured glass substrates for the realisation of microchannels for miniaturised chemical analysis applications. A first method consists of a proper cleaning of the two glass surfaces, followed by a simple epoxy gluing process at 90°C. In a second method, direct bonding is obtained just by exposing the glass stack to a high pressure (up to 50 MPa) in the 100-200°C temperature range. We obtain bonding strengths as high as 10

Intrinsic stress measurements were carried out on hydrogenated amorphous silicon (a-Si:H) films deposited with different excitation frequencies (13.56-70 MHz), by plasma-enhanced chemical vapor deposition. It was observed that films deposited at 70 MHz have one order of magnitude smaller intrinsic stress than those deposited at 13.56 MHz. These results have been linked to the estimated variation of the ion impact energy as a function of excitation frequency, deduced from the measured variation of the peak-t

Suspended micro resonator fabrication: atomic layer deposition

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Growth, Characterization and Adhesion of Thick Deposited Tungsten Layers Under Transient Loading in Magnum-PSI

Direct in-situ molecular speciation of atmospheric oxidized mercury in polar regions

Development of models for assessing corroded steel girder web panels in bridges

Microfluidic Chips for Point-of-Care Immunodiagnostics

Fast-curing coatings for adhesion promotion between metallic oxides and thermoplastic polyurethane

Pulsed laser deposition of KNN-based ferroelectric thin films on platinised Si substrates

Self-consistent ICRF simulations in fully shaped anisotropic plasmas

Development of low-firing lead-free thick-film materials on steel alloys for piezoresistive sensor applications

Design and manufacturing of the ITER ECRH Upper launcher mirrors

Selective light induced chemical vapour deposition of titanium dioxide thin films

Platinum particles deposited on synthetic boron-doped diamond surfaces. Application to methanol oxidation

The physics of plasma-enhanced chemical vapour deposition for large-area coating: industrial application to flat panel displays and solar cells

Development of novel low temperature bonding technologies for microchip chemical analysis applications

Dependence of Intrinsic Stress in Hydrogenated Amorphous-Silicon on Excitation-Frequency in a Plasma-Enhanced Chemical Vapor-Deposition Process