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Nanojet means that the liquid is forced to pass through the nozzle with the nanosize diameter, we report here that nanojet was formed for the first time in lab by heating the PbO coated Pb clusters. In this experiment, the coated clusters are heated to more than 200 C and it was found that the inner Pb core melted and ran out from the cracked outer shell with a 200-nm-long(as long) trail. The in situ...
A valve-less micropump with isosceles triangle cross-section nozzle-diffuser elements driven by PZT (Pb(Zr,Ti)O3) patch had been successfully fabricated by MEMS (mciro-electromechanical system) technologies. As flow rectifying elements, the nozzle-diffuser is in substitute of active check valve. Although the volume flow rate characteristics of conical, pyramidal, and flat-wall nozzle-diffuser have...
A novel architecture of high-selection-speed 3D data registration for inkjet application is proposed in this paper. As the increasing demand on the requirement of printing speed and simplicity of data management, inkjet printheads have been extended in the nozzle numbers from tens to hundreds in the recent years and further to thousands in the future, while intending to maintain data accessing points...
A novel passive micromixer with rapid mixing and low pressure drop has been successfully demonstrated by simulations and micro-fabrication. The structure of this micro-mixer contains one main channel, two sub-channels for injecting the other specie and some baffles in the main channel to form mixing chambers. Adding baffles to the main channel will produce the recirculation to increase the contact...
A novel micro-jet pump based on the principle of macroscopic jet pump are presented. The micro-jet pump can be used very easily for sampling in micro-fluidic systems under gas actuation. Vacuum suction mode provided by the pump can effectively decreases the formation of air bubbles and overcomes the interface tension between the liquid and solid wall in the micro-fluidic systems. Structurally the...
This paper presents the effect of driving waveform for piezoelectric bend mode inkjet printhead with optimized mechanical design. Experimental and theoretical studies on the applied driving waveform versus jetting characteristics were performed. The inkjet head has been designed to maximize the droplet velocity, minimize voltage response of the actuator and optimize the firing frequency to eject ink...
In this study, commercially available software CFD was adopted for analyzing the performance of straight-walled and curved-walled micro nozzle/diffuser. Such nozzle/diffuser was used in valve-less micro-pumps. This model tested different types of nozzle/diffuser and the results showed that the pressure loss coefficient for nozzle/diffuser decreases with the increase of Reynolds number. At the same...
This paper presents the fabrication of a micro droplet ejector for the application of digital printing system. The ejector makes the ink droplets of approximately 80 squaremum diameter on demand. The ejecting system is the type of face-shooter. The method of actuating membrane is bending mode using d31 of PZT. The size of ejector is 27.6 mm x 27.75 mm x 1.1 mm, and the pitch between nozzles is 2.54...
This paper present a novel electrostatic drop-on-demand micro jetting device featured by a MEMS fabricated nozzle with a conductive pole inside, referred to here as a pole type nozzle. The electric voltage signal applied to the ring shaped upper electrode plate, against the pole as the ground, allows a micro-dripping ejection of droplet to take place: That is, a tiny droplet is taken away from the...
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