Creating defined electrospun fiber geometries
View Patent ↗An object is built by depositing a mat on a build surface and utilizing a manufacturing process to position a structure over at least a portion of the mat to define an object. The object is removed from the build surface such that a first portion of the mat removed with the object is bonded to the structure, and a second portion of the mat removed with the object is unsupported by the structure. Alternatively, an object can be built by printing a conductive material over a surface to define a structure and utilizing the conductive material as a collector to control an electric field deposition over the structure to define an object where a first portion of the deposition is bonded to the structure and a second portion of the deposition is unsupported by the structure.
1. A collector array system, comprising:
a build plate comprising:
a non-conductive surface; and
conductive pins disposed within the non-conductive surface;
an electric deposition device orientable in operative arrangement with the build plate, wherein the electric deposition device comprises an electrically conductive gel-polymer-electrolyte (GPE) solution printer for printing the electrically conductive GPE solution onto the non-conductive surface; and
a controller coupled to the build plate, wherein the controller is operatively programmed to:
control individual ones of the conductive pins to be in a selected state, the state of at least one conductive pin affecting control of a deposition from the electric deposition device during operation thereof;
wherein the build plate includes at least one actuator that is controlled to move a corresponding insulated conductive pin to make contact with GPE printed by the GPE solution printer.
2. The collector array system of claim 1 , wherein:
each state comprises at least one of:
positive voltage, negative voltage, ground, or floating.
3. The collector array system of claim 1 , wherein:
the electric deposition device comprises an electrospinning device; and
the controller is operatively programmed to alternate the electrical state of multiple conductive pins in concert so that an electric field is dynamically changed to align electrospun fibers in a specific geometry induced by a specific pattern of conductive pin activation and frequency of the changing of the pattern.
4. The collector array system of claim 1 , wherein:
the controller dynamically modulates an output state of each conductive pin by varying at least one of voltage, frequency, pulse duration, and phase shift.
5. The collector array system of claim 1 , wherein:
the electric deposition device comprises an electrospinning device that outputs electrospun fibers; and
the controller controls electric state switching for each conductive pin by tuning the electric state switching to match a resonant frequency dependent on the properties of electrospun fibers to align fibers with each other in a preferred direction, and to constrain patterning of fibers to a specific area according to a desired fiber geometry.
6. The collector array system of claim 1 , wherein the conductive pins are selectively enabled in response to the controller controlling the selected states of the conductive pins.
7. The collector array system of claim 1 , wherein the conductive pins are selectively grounded in response to the controller controlling the selected states of the conductive pins.
8. The collector array system of claim 1 , further comprising a voltage source, wherein the conductive pins are selectively activated by the voltage source in response to the controller controlling the selected states of the conductive pins.
9. The collector array system of claim 1 , wherein the controller further controls a mixture of the electrically conductive GPE solution.
10. The collector array system of claim 1 , wherein the controller further controls a flow of the electrically conductive GPE solution.
11. The collector array system of claim 1 , wherein the controller further controls a delivery of the electrically conductive GPE solution.
12. The collector array system of claim 1 , wherein the controller further controls a patterning of the electrically conductive GPE solution.
13. The collector array system of claim 1 , wherein the electric deposition device comprises an ultraviolet (UV) curable silicone elastomer extruder for extruding a UV curable silicone elastomer onto the non-conductive surface.
14. The collector array system of claim 1 , wherein the controller further controls a flow of the UV curable silicone elastomer.
15. The collector array system of claim 1 , wherein the controller further controls a delivery of the UV curable silicone elastomer.
16. The collector array system of claim 1 , wherein the controller further controls a patterning of the UV curable silicone elastomer.
17. The collector array system of claim 1 , wherein the controller is used to dynamically modulate an output state of the insulated conductive pin contacting the printed GPE by varying at least one of voltage, frequency, pulse duration, and phase shift.
18. The collector array system of claim 1 wherein a GPE collecting electrode printed on the build plate is brought into contact with a stationary insulated conductive lead to change a state of the GPE collecting electrode.