초록 ▼

A droplet generator comprises a fluid reservoir having a side wall made of glass or quartz, and an end cap made from a silicon plate. The end cap contains a micromachined aperture through which the fluid is ejected. The side wall is thermally fused to the end cap, and no adhesive is necessary. This

A droplet generator comprises a fluid reservoir having a side wall made of glass or quartz, and an end cap made from a silicon plate. The end cap contains a micromachined aperture through which the fluid is ejected. The side wall is thermally fused to the end cap, and no adhesive is necessary. This means that the fluid only comes into contact with the side wall and the end cap, both of which are chemically inert. Amplitudes of drive pulses received by reservoir determine the horizontal displacements of droplets relative to the ejection aperture. The drive pulses are varied such that the dropper generates a two-dimensional array of vertically-falling droplets. Vertical and horizontal interdroplet spacings may be varied in real time. Applications include droplet analysis experiments such as Millikan fractional charge searches and aerosol characterization, as well as material deposition applications.

대표청구항 ▼

[ We claim:] [9.] A chemically unreactive fluid dropper comprising:a) a fluid;b) a fluid reservoir for holding said fluid, said reservoir comprising:(i) a side wall of a silicon-comprising compound having a surface layer comprising silicon dioxide, and(ii) an end cap comprising a silicon plate havin

[ We claim:] [9.] A chemically unreactive fluid dropper comprising:a) a fluid;b) a fluid reservoir for holding said fluid, said reservoir comprising:(i) a side wall of a silicon-comprising compound having a surface layer comprising silicon dioxide, and(ii) an end cap comprising a silicon plate having a micromachined aperture,said end cap being thermally welded to said side wall across said surface layer;c) an ejection means for producing pressure pulses in said fluid; andd) a control means in electrical communication with said ejection means, for sending drive pulses to said ejection means;whereby said fluid is ejected from said reservoir through said aperture by the pressure pulses produced by said ejection means.