Quantization of Droplets

A liquid jet is naturally unstable and wiU break up into droplets (3). The mode of disintegration is strongly related to the jet geometry and to the difference of the velocity hv of the liquid Vi and the surrounding gas Vg. 

In a large number of applications, the ability to accurately and repeatedly deposit nanogram quantities of a given substance is critical (4). This is largely driven by the usage of micro- and nanoscale products that require extremely accurate processing steps. Many 

This is particularly true in the manufacturing of many medical devices, where the amount and location of drug loading must be controlled to very precise specifications. In such cases, drop-on-de-mand inkjet technology is an attractive choice, as it addresses the needs for both accurate targeting and repeatable droplet ejection. 

Particularly for these kinds of highly-controlled applications, the quantity of substance being ejected from the inkjet devices must be known with an extreme accuracy. 

Various methods have been described to determine the quantity of substance, including (4)  

---