The main problem in preparing stable and printable inks containing nanoparticles for inkjet printing is to overcome the strong agglomeration of the particles in dispersion medium. In this study, the silver particles with diameter around 50 nm were produced by a simple wet chemistry method. Stable aqueous printable inks were formulated by using the combination of a triblock copolymer and high intensity focused ultrasound (HIFU). Various factors that affect the ink stability, such as, copolymer content and time of HIFU treatment, were investigated. The ink containing 5 wt% silver has a viscosity of about 2 mPas and surface tension 30 mN/m at 25 • C, which meet inkjet printer requirements. Such inks have been successfully printed on Al 2 O 3 ceramics and low-temperature co-fired ceramics (LTCC) and the printed films show low resistivity.
Using a model tokamak equilibrium, the influence of a magnetic separatrix on the stability of the plasma against ideal MHD ballooning modes is investigated. It is found that there is no significant stabilizing effect from the strong global shear near the separatrix, but rather that marginal stability is controlled mainly by the poloidal position of the X-point. A physical interpretation of these results is given.
This paper presents the findings of a design, modeling, and fabrication study of ZnO and PbZr 0 3 Ti 0 7 O 3 thin-film bulk acoustic resonators and filters. Measurements of the high-frequency responses of ZnO resonators having different area are used to develop an acoustic model that accurately represents resonator impedance data. The models are also used to interpret-parameter measurements on thin-film PbZr 0 3 Ti 0 7 O 3-based resonators and a value for the effective coupling coefficient deduced. ZnO and PbZr 0 3 Ti 0 7 O 3 ladder filters were designed based on measured impedance data from single resonators. Ladder filters based on PbZr 0 3 Ti 0 7 O 3 have been fabricated for the first time. It is shown that the high coupling coefficient in PbZr 0 3 Ti 0 7 O 3 leads to bandwidths in the range 100 120 MHz at a center frequency of 1.6 GHz, larger than the bandwidths of ZnO-based filters.
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