 | Acta Crystallographica Section D Acta Crystallographica Section D BIOLOGICAL CRYSTALLOGRAPHY |
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![[Figure 4]](ba5025fig4mag.jpg)
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Figure 4
Comparison of nanodispensing by piezotechnology (left) and electrospray (right). In piezotechnology, a piezocrystal changes its shape when a voltage is applied. This change in shape creates a pressure difference, either by opening a valve leading out of a pressurized container or (as indicated above) by pushing against the fluid. The pressure wave creates a drop on demand. Because it is a ballistic technique, it is strongly affected by the viscosity of the fluid. Electrospray uses a very different principle: an electric potential difference pulls droplets out of a fluid body. It is hardly affected by viscosity or surface tension (see also Hartman et al., 1999  ). |
![[Figure 4]](ba5025fig4.jpg)
| BIOLOGICAL CRYSTALLOGRAPHY |
ISSN: 1399-0047
