Apparatus for anisotropic focusing
View Patent ↗A substantially planar assembly for depositing material. The assembly comprises plates which, when assembled, define at least one aerosol channel, a sheath gas plenum, and a nozzle. These components are preferably anisotropic, and preferably rectangular. The aerosol channel may be divided further to improve uniformity of aerosol flow.
1. A material deposition assembly comprising:
a sheath gas plenum;
at least one aerosol channel comprising a rectangular opening, said channel disposed concentrically within and surrounded by said sheath gas plenum;
a convergence zone wherein a sheath gas forms a combined stream comprising an outer annular sheath flow and an inner aerosol-laden carrier flow by directly surrounding and focusing an aerosol exiting said opening;
a nozzle comprising a rectangular cross section for transporting the combined stream;
a first cover plate and a second cover plate, either or both of said cover plates comprising an inlet for an aerosol comprising a material and one or more sheath gas inlets; and
an insert sealed between said cover plates, said insert comprising said at least one aerosol channel, said at least one aerosol channel in fluid connection with said aerosol inlet and said nozzle;
wherein said one or more sheath gas inlets are in fluid connection with said sheath gas plenum, said sheath gas plenum enclosing an exit of said at least one aerosol channel and an entrance of said nozzle; and
wherein said insert comprises two mirror imaged plates which when assembled together form said at least one aerosol channel and said nozzle.
2. The material deposition assembly of claim 1 wherein dimensions of said sheath gas plenum are anisotropic.
3. The material deposition assembly of claim 1 wherein said at least one aerosol channel is aligned with said nozzle.
4. The material deposition assembly of claim 1 further comprising channels connecting said one or more sheath gas inlets and said sheath gas plenum, said channels configured so that a sheath gas enters said sheath gas plenum travelling in a direction substantially parallel to a flow direction of said aerosol in said at least one aerosol channel.
5. The material deposition assembly of claim 1 wherein said insert comprises a tip shim comprising said at least one aerosol channel.
6. The material deposition assembly of claim 5 wherein said tip shim comprises a deformable material.
7. The material deposition assembly of claim 6 wherein deformation of said tip shim varies a width of a tip of said at least one aerosol channel.
8. The material deposition assembly of claim 1 wherein at least a portion of said at least one aerosol channel is subdivided into a plurality of smaller sub-channels.
9. The material deposition assembly of claim 8 wherein said sub-channels are aligned axially and arranged in two rows, the sub-channels in a first row offset from the sub-channels in a second row.
10. The material deposition assembly of claim 9 wherein the sub-channels in said first row are angled with respect to the sub-channels in said second row.
11. The material deposition assembly of claim 10 wherein the individual aerosol flows in adjacent sub-channels cross when exiting said at least one aerosol channel.
12. The material deposition assembly of claim 1 wherein at least a portion of said at least one aerosol channel comprises alternating offset dividers.