Electrospraying/electrospinning array utilizing a replacement array of individual tip flow restriction
An electrohydrodynamic spraying or spinning deposition system, which includes a common source of pressurized liquid within a manifold, and an array of 2 or more spraying tips, each tip being fed from the common source of pressurized liquid to create a liquid flow path. An individual flow impedance device is disposed within each tip's individual liquid flow path from the pressurized liquid source into each spraying tip. The individual flow impedance devices are disposed within a replaceable sheet, which can be easily cleaned or changed to accommodate the instance liquid viscosity and composition. A high voltage source is applied to create a high voltage potential applied between the tip array and a deposition surface.
1. An electrohydrodynamic spraying/spinning deposition system comprising:
(a) a common source of pressurized fluent material within a manifold;
(b) an array of 2 or more spraying/spinning tips, each one of the tips being fed from the common source of pressurized fluent material so as to provide a corresponding flow path for the fluent material;
(c) a corresponding individual flow impedance device disposed within the corresponding flow path of each one of the tips between that tip and the pressurized fluent material source, each individual flow impedance device comprising a corresponding set of one or more orifices, wherein the sets of orifices for the tips of the array are formed in a common replaceable liquid-impermeable sheet;
(d) a deposition surface; and
(e) a high voltage source adapted and connected to create a high voltage potential applied between the tip array and the deposition surface.
2. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein the pressurized fluent material is pressurized to between about 0.01 and about 100 psi.
3. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein a portion of the flow path between each spraying/spinning tip and the corresponding set of orifices comprises a corresponding cavity having a larger transverse extent than the spraying/spinning tip and the corresponding set of orifices, and each corresponding cavity is separated from the common source of fluent material by the liquid-impermeable sheet.
4. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein a portion of the flow path between each spraying/spinning tip and the corresponding set of orifices includes a corresponding tube which extends the corresponding tip into an electric field of the high voltage potential.
5. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein a portion of the flow path between each spraying/spinning tip and the corresponding set of orifices includes a tube having an inner diameter greater than about 250 μm.
6. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein each set of orifices comprises (i) one or more orifices between about 10 μm and about 200 μm in diameter or (ii) a cluster of orifices having a total effective area between about 78 μm 2 and about 31000 μm 2 .
7. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein the orifices in the liquid-impermeable sheet are formed by one or more of mechanical drilling, laser drilling, electrochemical etching, electroforming, punching, perforating, or penetration by a heated point.
8. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein the liquid-impermeable sheet is removable from between the array of spraying/spinning tips and the common source of pressurized fluent material source.
9. The electrohydrodynamic spraying/spinning deposition system of claim 8 wherein a portion of the flow path between each spraying/spinning tip and the corresponding set of orifices comprises a corresponding cavity having a larger transverse extent than the spraying/spinning tip and the corresponding set of orifices, and each corresponding cavity is separated from the common source of fluent material by the liquid-impermeable sheet upon insertion of the sheet into the manifold.
10. The electrohydrodynamic spraying/spinning deposition system of claim 1 , wherein the liquid-impermeable sheet is attached to a frame which is indexed to position each set of orifices within the corresponding flow path upon insertion of the sheet into the manifold.
11. The electrohydrodynamic spraying/spinning deposition system of claim 10 wherein a portion of the flow path between each spraying/spinning tip and the corresponding set of orifices comprises a corresponding cavity having a larger transverse extent than the spraying/spinning tip and the corresponding set of orifices, and each corresponding cavity is separated from the common source of fluent material by the liquid-impermeable sheet upon insertion of the sheet into the manifold.
12. The electrohydrodynamic spraying/spinning deposition system of claim 1 , further comprising at least one additional manifold and, for each additional manifold, a corresponding array of spinning tips and set of flow impedance devices.