An electrospray printing device with magnetic field confined jet

Abstract

The present invention belongs to the field of advanced manufacturing technology, and relates to an electrojet printing device for magnetic field-constrained jets. By adjusting the length of the telescopic rod, the position of the five magnets from the bottom of the needle and the surrounding radius of the jet are controlled, the strength of the central magnetic field is changed, and the degree of constraint of the magnetic field on the jet is adjusted to focus or diverge the jet, thereby playing a role in assisting the electric field constraint and adjusting the three-dimensional micro-nano structure deposited on the substrate. The purpose of precise control of the jet can be achieved by using a magnetic field, thereby reducing the impact of environmental changes on the accuracy of electrofluidic printing. The device strengthens the control of the jet, has the characteristics of high printing resolution and high control accuracy, and can realize high-precision, low-cost electrojet printing manufacturing.

Description

Technical Field

[0001] The invention belongs to the field of advanced manufacturing technology and relates to an electrospray printing device for magnetic field-constrained jets. Background Art

[0002] Based on electrohydrodynamic jet forming deposition technology, unlike the "push" method used in traditional printing technologies such as thermal printing and piezoelectric printing, printing uses electric field drive to "pull" from the top of the liquid cone to generate a very fine jet. A high voltage power supply is applied between the conductive nozzle and the conductive substrate, and the strong electric field force formed between the nozzle and the substrate is used to pull the liquid out of the nozzle to form a Taylor cone. Since the nozzle has a high electric potential, the liquid at the nozzle will be affected by electro-shear stress. When the local charge force exceeds the surface tension of the liquid, the charged liquid is ejected from the nozzle to form an extremely fine jet, which is sprayed and deposited on the substrate. Combined with the movement of the wafer stage and the nozzle workbench, the manufacture of complex three-dimensional micro-nano structures can be achieved.

[0003] Electrojet printing can form a "Taylor cone" at the nozzle, and the printing resolution is not limited by the nozzle diameter, and can achieve micron and submicron scale printing. However, before the traditional electrofluidic printing jet reaches the substrate, it is easily affected by air disturbances and electric field changes, which interfere with the jet path and may cause jet splashing, poor jet size consistency, and low jet position accuracy, affecting the printing accuracy and limiting the use of electrofluidic printing technology. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technology and provide an electrojet printing device with a magnetic field constrained jet. During the electrojet printing process, after the ink is ejected from the nozzle under the action of an external force, the position of the five magnets from the bottom of the needle and the surrounding radius of the printed jet are controlled by adjusting the length of the telescopic rod, the strength of the central magnetic field is changed, and the degree of constraint of the magnetic field on the printed jet is adjusted to make the jet focus or diverge, thereby playing a role in assisting the electric field constraint and adjusting the three-dimensional micro-nano structure deposited on the substrate by the jet. Therefore, the purpose of accurately controlling the jet can be achieved by adopting a magnetic field, thereby reducing the influence of environmental changes on the accuracy of electrofluid printing. Compared with the printing technology controlled by a single electric field, this method strengthens the control of the printed jet, has the characteristics of high printing resolution and high control accuracy, and can realize high-precision and low-cost electrojet printing manufacturing.

[0005] The technical solution of the present invention:

[0006] An electrospray printing device with a magnetic field constraining a jet, in which ink is ejected from a nozzle under the action of an external force. By adjusting the length of a telescopic rod, the position of a magnet from the bottom of a spray needle and the radius of the surrounding of the printing jet are controlled, the strength of the central magnetic field is changed, and the degree of constraint of the magnetic field on the printing jet is adjusted. The jet ejected from the spray needle is constrained to focus or diverge, thereby playing a role in assisting electric field constraint and adjusting the three-dimensional micro-nano structure deposited on the substrate by the spray.

[0007] An electrospray printing device for magnetic field-constrained jet, characterized in that: it includes an electrospray module, a detachable support module, a magnet support control module and a magnet; the electrospray module includes a precision injection pump 1, a syringe 2, ink 3, a catheter 4, a spray needle 5 and a high-voltage power supply 8; the syringe 2 is fixed above the precision injection pump 1, filled with ink 3, and connected to the spray needle 5 through the catheter 4; the high-voltage end of the high-voltage power supply 8 is connected to the spray needle 5, so that the spray needle 5 is at a high potential; the ground end of the high-voltage power supply 8 is connected to the substrate 20, so that the substrate 20 is at a low potential;

[0008] The detachable support module includes a left annular sleeve 9, a lower telescopic rod base 10, an upper telescopic rod base 11, a round head bolt 12, a connecting lock 13, a right annular sleeve 14, a nut 15, a lower telescopic rod 16, and an upper telescopic rod 17; the upper and lower parts of the left annular sleeve 9 each have three pairs of evenly distributed upper telescopic rod bases 11 and lower telescopic rod bases 10; the left annular sleeve 9 and the right annular sleeve 14 form a revolving pair through the round head bolts 12 and the nuts 15, and can rotate freely around the axis; the connecting lock 13 is connected by bolts, so that the left annular sleeve 9 and the right annular sleeve 14 are sleeved on the periphery of the spray needle 5; the bottom of the upper telescopic rod 17 is hinged in the upper telescopic rod base 11, which can rotate around the axis, and the telescopic end is freely hinged at the vertical corner of the lower telescopic rod 16; the bottom of the lower telescopic rod 16 is freely hinged to the lower telescopic rod base 10 through a pin, and the lower telescopic rod 16 can be driven to rotate around the axis by controlling the telescopic length of the upper telescopic rod 17;

[0009] The magnet 18 is fixed to the telescopic end of the lower telescopic rod 16. By controlling the telescopic length of the lower telescopic rod 16, the magnet 18 can be moved up and down. There are five magnets 18, which are evenly surrounded by the jet 19.

[0010] The magnet support control module includes a support device controller 6 and a signal processor 7; the signal processor 7 can monitor and process printing parameters and transmit control signals to the support device controller 6; the support device controller 6 can control the position of the magnet 18 and adjust the jet 19 by controlling the telescopic length of the lower telescopic rod 16 and the upper telescopic rod 17;

[0011] The above device is used to perform electrospray printing of a magnetic field-confined jet, which is characterized by the following steps:

[0012] The first step is jet formation

[0013] The syringe 2 extracts a certain volume of ink 3, and the precision syringe pump 1 accurately controls the pressure to pump the ink 3 in the syringe 2 into the spray needle 5 through the conduit 4; the high-voltage power supply 8 can control the voltage between the spray needle 5 and the substrate 20, and the ink 3 forms a jet 19 at the nozzle of the spray needle 5 under the combined action of electric field force, pressure, and gravity;

[0014] Step 2: Magnetic field confines the jet

[0015] The jet 19 leaves the nozzle 5 under the combined force. At the same time, the signal processor 7 monitors and processes the printing parameters, transmits the control signal to the support device controller 6, and controls and adjusts the telescopic length of the lower telescopic rod 16 and the upper telescopic rod 17 in real time, controls the position of the magnet 18 from the bottom of the nozzle 5 and the surrounding radius of the jet 19, changes the strength of the central magnetic field, adjusts the degree of constraint of the magnetic field on the jet 19, and controls the path and dispersion of the jet 19; when the upper telescopic rod 17 is shortened, the lower telescopic rod 16 rotates upward, and the magnet 18 moves to As the periphery moves, the circling radius becomes larger, the density of the central magnetic flux lines decreases, and the jet 19 will diverge; conversely, when the upper telescopic rod 17 is extended, the density of the central magnetic flux lines increases, and the jet 19 will be more concentrated under the action of the magnetic field force; the lower telescopic rod 16 can adjust the position of the magnet 18 from the bottom of the spray needle 5; when the lower telescopic rod 16 is shortened, the magnet 18 moves upward, the magnetic field at the substrate 20 will weaken, and the jet 19 will diverge; when the lower telescopic rod 16 is extended, the magnet 18 moves downward, the magnetic field at the substrate 20 will increase, and the jet 19 will be more concentrated.

[0016] Furthermore, the electrospray printing device for magnetic field-constrained jet is characterized in that the ink 3 is added with metal nano-conductive particles such as iron that can be controlled by a magnetic field.

[0017] Furthermore, the magnetic field constrained jet electrospray printing device is characterized in that the left annular sleeve 9 and the right annular sleeve 14 are detachable, and the inner diameter can be adjusted by adjusting the tightness of the connecting lock 13, so as to be suitable for different electrofluidic devices.

[0018] Furthermore, the electrospray printing device with a magnetic field constrained jet is characterized in that the maximum telescopic length of the upper telescopic rod base 11 is 8 cm, and the maximum inner diameter of the five magnets 18 can vary by 10 cm; the maximum telescopic length of the lower telescopic rod 16 is 12 cm, which can drive the magnet 18 to move up and down 9 cm.

[0019] Furthermore, the electrospray printing device with a magnetic field constrained jet is characterized in that the magnet 18 is made of permanent ferrite, which has excellent anti-demagnetization performance, no oxidation problem and high heating temperature.

[0020] The invention has the beneficial effects of: using an electrojet printing device with a magnetic field to constrain the jet, adjusting the degree of constraint of the magnetic field on the jet, focusing or diverging the jet, thereby playing an auxiliary role in electric field constraint, and adjusting the three-dimensional micro-nano structure deposited on the substrate by the jet. Compared with the printing technology controlled by a single electric field, the control of the jet is strengthened, the influence of environmental changes is reduced, and the printing resolution is high, the control accuracy is high, and the electrojet printing manufacturing with high accuracy and low cost can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a simplified diagram of an electrospray printing device for a magnetic field-confined jet;

[0022] Figure 2 It is a simplified diagram of an annular sleeve;

[0023] Figure 3 is a schematic diagram of a detachable support device;

[0024] Figure 4 It is a schematic diagram of a magnet;

[0025] In the figure: 1 precision injection pump, 2 syringe, 3 ink, 4 catheter, 5 needle, 6 support device controller, 7 signal processor, 8 high voltage power supply, 9 left annular sleeve, 10 lower telescopic rod base, 11 upper telescopic rod base, 12 round head bolt, 13 connecting lock, 14 right annular sleeve, 15 nut, 16 lower telescopic rod, 17 upper telescopic rod, 18 magnet, 19 jet, 20 substrate.

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It is obvious that the embodiments described below are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. DETAILED DESCRIPTION

[0027] During the electrojet printing process, after the ink is ejected, the length of the telescopic rod is adjusted to control the position of the magnet from the bottom of the needle and the radius of the jet surrounding the printing fluid, thereby changing the strength of the central magnetic field, adjusting the degree of constraint of the magnetic field on the printing fluid, controlling the concentration and divergence of the jet, and adjusting the shape of the jet on the substrate.

[0028] The invention discloses an electrojet printing device for magnetic field-constrained jet, comprising an electrojet module, a detachable support module, a magnet support control module and a magnet.

[0029] The injection pump 1 adopts the PHD ULTRA series injection pump, which can achieve a high stable and high precision flow rate, with a flow rate range of 1.56pl / min-215.8ml / min. The stepper motor inside the injection pump adopts advanced micro-step technology, and drives the screw and push rod forward or backward under the control of the microprocessor, with a stable accuracy of 0.25%-0.4% and a reproducible accuracy of 0.05%-0.15%. The syringe 2 is installed above the precision injection pump 1 and contains ink 3. The ink 3 is a nano-metal ink with magnetic conductivity such as iron powder, and is connected to the spray needle 5 through a conduit 4. The conduit 4 adopts a quartz capillary wrapped by polyimide with a diameter of 365μm. The high-voltage power supply 8 adopts a voltage of 1500-10000V, and the output end is connected to the spray needle 5, so that the spray needle 5 is at a high potential, and the ground end of the high-voltage power supply 8 is connected to the substrate 20, so that the substrate 20 is at a low potential.

[0030] The left annular sleeve 9 has three pairs of evenly distributed upper telescopic rod bases 11 and lower telescopic rod bases 10 in the upper and lower parts, and the sleeve is detachable. The inner diameter can be adjusted by adjusting the tightness of the connecting lock 13, which is suitable for different electrofluid spray needles. The left annular sleeve 9 and the right annular sleeve 14 form a revolving pair through round head M3 bolts 12 and nuts 15, and can rotate freely around the axis. The connecting lock 13 is connected by bolts so that the sleeve is sleeved on the periphery of the spray needle 5. The bottom of the upper telescopic rod 17 is hinged in the upper telescopic rod base 11 and can rotate around the axis. The telescopic end is freely hinged at the vertical corner of the lower telescopic rod 16. The bottom of the lower telescopic rod 16 is freely hinged to the lower telescopic rod base 10 through a pin. By controlling the telescopic length of the upper telescopic rod 17, the lower telescopic rod 16 can be driven to rotate around the axis. The telescopic rod adopts a micro electric push rod DC 12V-17V to achieve precise transmission. The maximum telescopic length of the upper telescopic rod base 11 is 8 cm, and the maximum inner diameter of the magnet 18 can be changed by 10 cm. The maximum telescopic length of the lower telescopic rod 16 is 12 cm, which can drive the magnet 18 to move up and down by 9 cm.

[0031] The magnet 18 is fixed to the telescopic end of the lower telescopic rod 16. The magnet 18 can be moved up and down by controlling the telescopic length of the lower telescopic rod 16. There are five magnets 18, which are evenly surrounded by the jet 19. The magnet 18 is made of permanent ferrite, which has excellent anti-demagnetization performance, no oxidation problem and high heating temperature.

[0032] The support device controller 6 adopts a single-chip microcomputer system to realize motion control. After receiving the sensor signal, the signal processor 7 obtains the control voltage of the starter rod through model calculation, and uses the monitoring software to feedback the 3D printing parameters. The support device controller 6 controls the telescopic length of the lower telescopic rod 16 and the upper telescopic rod 17, controls the position of the magnet 18, and adjusts the jet 19.

[0033] The above device is used to perform electrospray printing of a magnetic field-confined jet, and the steps are as follows:

[0034] The first step is to form an electrojet

[0035] The precision syringe pump 1 accurately controls the pressure at 30KPa-40KPa, and pumps the ink 3 in the syringe 2 into the nozzle 5 through the conduit 4. The high-voltage power supply 8 controls the voltage between the nozzle 5 and the printing substrate to be 2000V. The ink 3 forms a 100μm-level stable jet 19 at the nozzle of the nozzle 5 under the combined action of electric field force, pressure and gravity.

[0036] Step 2: Magnetic field confines the jet

[0037] The support device controller 6 adjusts the telescopic length of the lower telescopic rod 16 and the upper telescopic rod 17 in real time, controls the position of the magnet 18 from the bottom of the spray needle 5 and the surrounding radius of the printing jet 19, thereby changing the strength of the central magnetic field and adjusting the degree of constraint of the magnetic field on the jet 19. When the upper telescopic rod 17 is shortened, the lower telescopic rod 16 rotates upward, the magnet 18 moves toward the periphery, the surrounding radius becomes larger, the central magnetic flux density decreases, and the jet 19 diverges. When the upper telescopic rod 17 is extended, the central magnetic flux density increases, and the jet 19 will be more concentrated under the action of the magnetic field force. The lower telescopic rod 16 can adjust the position of the magnet 18 from the bottom of the spray needle 5. When the lower telescopic rod 16 is shortened, the magnet 18 moves upward, the magnetic field at the substrate 20 will weaken, and the jet 19 will diverge. When the lower telescopic rod 16 is extended, the magnet 18 moves downward, the magnetic field at the substrate 20 will increase, and the jet 19 will be more concentrated.

[0038] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An electrospray printing device with a magnetic field-constrained jet, characterized in that: The invention comprises an electrospray module, a detachable support module, a magnet support control module and a magnet; the electrospray module comprises a precision injection pump (1), a syringe (2), ink (3), a catheter (4), a spray needle (5) and a high-voltage power supply (8); the syringe (2) is fixed above the precision injection pump (1), contains ink (3) and is connected to the spray needle (5) through the catheter (4); the high-voltage end of the high-voltage power supply (8) is connected to the spray needle (5), so that the spray needle (5) is at a high potential; the ground end of the high-voltage power supply (8) is connected to the substrate (20), so that the substrate (20) is at a low potential; The detachable support module comprises a left annular sleeve (9), a lower telescopic rod base (10), an upper telescopic rod base (11), a round head bolt (12), a connecting lock (13), a right annular sleeve (14), a nut (15), a lower telescopic rod (16), and an upper telescopic rod (17); the upper and lower parts of the left annular sleeve (9) each have three pairs of evenly distributed upper telescopic rod bases (11) and lower telescopic rod bases (10); the left annular sleeve (9) and the right annular sleeve (14) are connected by the round head bolt (12) and the nut (15) to form a The rotating pair can rotate freely around the axis; the connecting lock buckle (13) is connected by bolts, so that the left annular sleeve (9) and the right annular sleeve (14) are sleeved on the periphery of the spray needle (5); the bottom of the upper telescopic rod (17) is hinged in the upper telescopic rod base (11), rotates around the axis, and the telescopic end is freely hinged at the vertical corner of the lower telescopic rod (16); the bottom of the lower telescopic rod (16) is freely hinged in the lower telescopic rod base (10) through a pin, and the lower telescopic rod (16) is driven to rotate around the axis by controlling the telescopic length of the upper telescopic rod (17); The magnet (18) is fixed to the telescopic end of the lower telescopic rod (16), and the magnet (18) is moved up and down by controlling the telescopic length of the lower telescopic rod (16); there are five magnets (18) uniformly surrounding the periphery of the jet (19); The magnet support control module comprises a support device controller (6) and a signal processor (7); the signal processor (7) uses monitoring software to identify and process printing parameters, and transmits control signals to the support device controller (6); the support device controller (6) controls the position of the magnet (18) and adjusts the jet (19) by controlling the telescopic length of the lower telescopic rod (16) and the upper telescopic rod (17); The above device is used to perform electrospray printing of a magnetic field-confined jet, and the steps are as follows: The first step is jet formation The syringe (2) extracts a certain volume of ink (3), and the precision syringe pump (1) accurately controls the pressure to pump the ink (3) in the syringe (2) into the spray needle (5) through the catheter (4); the high-voltage power supply (8) controls the voltage between the spray needle (5) and the substrate (20), and the ink (3) forms a jet (19) at the nozzle of the spray needle (5) under the combined action of electric field force, pressure, and gravity; Step 2: Magnetic field confines the jet The jet (19) leaves the nozzle (5) under the combined force, and at the same time, the signal processor (7) monitors and processes the printing parameters, transmits the control signal to the support device controller (6), and controls and adjusts the telescopic length of the lower telescopic rod (16) and the upper telescopic rod (17) in real time, controls the position of the magnet (18) from the bottom of the nozzle (5) and the surrounding radius of the jet (19), changes the strength of the central magnetic field, adjusts the degree of constraint of the magnetic field on the jet (19), and controls the path and dispersion of the jet (19); when the upper telescopic rod (17) is shortened, the lower telescopic rod (16) rotates upward, and the magnet (18) moves to the nozzle (5). When the outer part moves, the surrounding radius increases, the density of the central magnetic flux lines decreases, and the jet (19) will diverge; conversely, when the upper telescopic rod (17) is extended, the density of the central magnetic flux lines increases, and the jet (19) will be more concentrated under the action of the magnetic field force; the lower telescopic rod (16) can adjust the position of the magnet (18) from the bottom of the spray needle (5); when the lower telescopic rod (16) is shortened, the magnet (18) moves upward, the magnetic field at the substrate (20) will weaken, and the jet (19) will diverge; when the lower telescopic rod (16) is extended, the magnet (18) moves downward, the magnetic field at the substrate (20) will increase, and the jet (19) will be more concentrated.

2. The electrospray printing device for magnetic field-confined jet according to claim 1, characterized in that The ink (3) is metal nano-conductive particles added with iron and can be controlled by a magnetic field.

3. The electrospray printing device for magnetic field-confined jet according to claim 1, characterized in that The left annular sleeve (9) and the right annular sleeve (14) are detachable, and the inner diameter can be adjusted by adjusting the tightness of the connecting lock buckle (13), so they are suitable for different electrofluidic devices.

4. The electrospray printing device for magnetic field-confined jet according to claim 1, characterized in that The maximum telescopic length of the upper telescopic rod base (11) is 8 cm, and the maximum inner diameter of the five magnets (18) can be changed by 10 cm; the maximum telescopic length of the lower telescopic rod (16) is 12 cm, and the magnet (18) can be driven to move up and down by 9 cm.

5. The electrospray printing device for magnetic field-confined jet according to claim 1, characterized in that The magnet (18) is made of permanent ferrite, has excellent anti-demagnetization performance, has no oxidation problem and has a high heating temperature.

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