CN113694848B - Liquid marble surface modification device and method under powder ultrasonic fluidization effect - Google Patents
Liquid marble surface modification device and method under powder ultrasonic fluidization effect Download PDFInfo
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- CN113694848B CN113694848B CN202111081082.3A CN202111081082A CN113694848B CN 113694848 B CN113694848 B CN 113694848B CN 202111081082 A CN202111081082 A CN 202111081082A CN 113694848 B CN113694848 B CN 113694848B
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Abstract
The invention discloses a device and a method for modifying the surface of a liquid marble under the action of ultrasonic powder fluidization, and belongs to the technical field of surface modification of liquid marble coating. The device according to the invention comprises: the device comprises a feeding dropper, a dust cap, a first cavity, a central liquid drop collecting pipe, a second cavity and a microwave reinforced channel; the feeding dropper is clamped by an iron clamp and penetrates through the dust cover to be communicated with the first cavity; an electrode plate is attached to the inner wall of the first cavity, and an electric field is formed between the electrode plate and the central collecting pipe of the liquid drops in the first cavity; the upper end of the liquid drop central collecting pipe is connected to the dustproof cover, and the lower end of the liquid drop central collecting pipe is supported by the bottom end of the second cavity; the second cavity is connected to the microwave strengthening channel through a concave ball valve. The device of the invention utilizes ultrasonic standing waves to suspend the liquid marble in fluidized powder, a layer of powder is attached to the surface of the liquid marble, and microwaves with certain intensity are applied through the microwave emitting device, so that the powder can be uniformly and tightly coated on the surface of the liquid marble, and the size of the liquid marble is regulated and controlled.
Description
Technical Field
The invention relates to a device and a method for modifying the surface of a liquid marble under the ultrasonic fluidization effect of powder, belonging to the technical field of coating and surface modification of the liquid marble.
Background
After the water drops or the liquid drops taking water as the main body contact with the hydrophobic particles with the micron or nanometer scale, the particles can be transferred to the surface of the liquid drops to form liquid marbles. The liquid marbles do not wet the hydrophilic substrate and can even float on the water surface. The liquid marble has great scientific research value because of showing great application potential in the aspects of micro-fluid transmission and microreactors.
The commonly adopted research method of the liquid marble comprises the following steps: uniformly scattering hydrophobic powder on a substrate, dripping liquid drops on the powder by using an injector, shaking the substrate to enable micro/nano particles in the powder to be in contact with the liquid drops and to be transferred to the surface of the liquid drops, and obtaining liquid with special elasticity after the liquid drops are completely wrapped. French scholars Pascale Aussillous and David Quer propose a method for preparing liquid marbles (Nature, 2001,411: 924-. These liquid marbles can not only roll on the glass surface, but also float on the water surface. However, the liquid marble formed by coating the liquid drop with the super-hydrophobic particles has certain defects and poor stability, the volume of the liquid marble is reduced along with the evaporation of the internal liquid, the thickness of the hydrophobic layer is relatively increased, the pressure of the hydrophobic layer on the internal liquid is also increased, and finally the liquid marble is cracked. Therefore, the stability of the liquid marble is poor, and the liquid marble is not easy to store for a long time.
At present, most of the traditional liquid marble preparation methods roll a small amount of liquid drops into solid particles with strong hydrophobicity, and the hydrophobic particles can naturally wrap the liquid drops to form the liquid marbles. The liquid drop can obtain corresponding properties such as heat sensitivity, magnetic properties and the like by attaching a layer of powder with special properties on the surface of the liquid drop. Patent CN105361242A discloses a multifunctional cigarette blasting bead based on liquid marble and a preparation method thereof, the method is a 'solid' perfume based on liquid marble and a preparation method thereof, hydrophobic powder is used as a stabilizer, micro-droplets are dripped above the stabilizer, and the liquid marble, namely the 'solid' perfume, is prepared by a rolling dripping method, but the size of the obtained liquid marble is uncontrollable and is completely influenced by the size of the droplets.
Patent CN106914196A discloses a method for preparing water-carrying microcapsules based on liquid marbles, which comprises wrapping a layer of super-hydrophobic powder on the surface of liquid to form liquid marbles, then freezing the liquid marbles in a low temperature environment, then coating instant adhesive on the surface of the frozen liquid marbles by dipping, carrying out "encapsulation" on the liquid marbles, finally coating a photo-curing coating on the surface of the "encapsulated" liquid marbles by dipping, and curing by ultraviolet radiation to obtain the water-carrying microcapsules. The method has complex preparation process and low efficiency.
In the past, the liquid marble modification process needs to carry out powder adhesion by moving liquid drops to a powder tray, the size of the formed liquid marble is influenced by a discharging device, the problem of uneven powder adhesion on the surfaces of the liquid drops exists, and the liquid marble loses the utilization value due to the fact that the powder falls off easily; in addition, the problem of powder diffusion occurs in the preparation process, and dust pollution is caused, so that the powder has great harm to human bodies and the environment.
Disclosure of Invention
The applicant provides a device and a method for modifying the surface of a liquid marble under the ultrasonic fluidization action of powder, aiming at the defects in the prior art, so that the uniform adhesion of the powder on the surface of the liquid marble can be realized, the surface modification of the liquid marble can be realized, and the size of the modified liquid marble can be regulated and controlled to adapt to the actual production requirements. The invention aims to efficiently finish the surface modification of the liquid marble through the ultrasonic fluidization of the powder, solve the problem of arbitrary diffusion of the powder in space in the surface modification process, reduce the environmental pollution and improve the surface modification efficiency.
The device and the method for modifying the surface of the liquid marble under the ultrasonic fluidization effect of the powder can be used for preparing submicron-grade liquid marbles. According to the technical scheme, the powder is suspended at the central axis of the cavity by using ultrasonic waves, and the liquid drops fall along the central axis and are adhered to the surface of the powder when passing through the powder. The microwave with certain intensity is applied through the microwave emitting device, so that the powder can be uniformly and tightly attached to the surface of the liquid marble, the surface of the liquid marble is modified, and the size of the liquid marble can be regulated and controlled. The whole surface modification process of the liquid marble is clean and pollution-free, and the utilization rate of the powder can be improved.
In the invention, the liquid drop is defined as a tiny liquid drop which is dropped from a feeding dropper, and the liquid marble is defined as spherical particles of which the surface is modified by coating powder and is dried by microwave.
The technical scheme adopted by the invention is as follows:
the invention firstly provides a liquid marble surface modification device under the ultrasonic fluidization effect of powder, which comprises: the device comprises a feeding dropper (1), a dust cap (7), a first cavity (2), a central liquid drop collecting pipe (3), a second cavity (4) and a microwave reinforced channel (6); wherein: the dustproof cover (7) is arranged above the first cavity (2), and a powder inlet (8) and a gas outlet micropore (9) are formed in the dustproof cover (7); the feeding dropper (1) is clamped by an iron clamp (10) and communicated to the central liquid drop collecting pipe (3) through the dustproof cover (7); the central collection pipe (3) for the droplets is located inside the first chamber (2); the upper end of the central liquid drop collecting pipe (3) is connected to the dustproof cover (7), and the lower end of the central liquid drop collecting pipe is supported by the bottom of the second cavity (4); an electrode plate (21) is attached to the inner wall of the first cavity (2), and an electric field can be formed between the electrode plate (21) and the central liquid drop collecting pipe (3) in the first cavity (2); the second cavity (4) is communicated with the first cavity (2), and the second cavity (4) is connected to the microwave intensifying channel (6) through a concave ball valve (5).
According to the device of the invention, in one embodiment, the side wall of the second cavity (4) is provided with an air inlet section (41) and an ultrasonic emission section (42) at intervals, the air inlet section (41) is provided with air inlet micropores (411), the air flow speed is adjusted through an air inlet pipeline (412) and an air inlet valve (413), and the inner side of the air inlet section (41) is provided with an L-shaped electrode plate (43); a first ultrasonic transducer (421), a second ultrasonic transducer (422) and a third ultrasonic transducer (423) are adhered to the outer side of the ultrasonic transmitting section (42); the inner diameter of the air inlet pipeline (412) is 8-12 mm, and the air inlet pipeline is made of PVC material; the diameter of the air inlet micropores (411) is 1-2 mm.
According to the device, in one embodiment, the ultrasonic waves emitted by the first ultrasonic transducer (421), the second ultrasonic transducer (422) and the third ultrasonic transducer (423) form a sound field in the second cavity (4), and the ultrasonic emission section is made of metal.
According to the device, in one embodiment, the dust cover (7) is connected to the upper end of the first cavity (2) through a bolt, and a filter screen with the aperture far smaller than the diameter of the powder is arranged in the air outlet micropore (9) on the dust cover (7); the dustproof cover (7) is made of an insulating material; the upper end of the feeding dropper (1) is connected with the micro-channel injection pump, the inner diameter of the feeding dropper (1) is 0.3-0.8 mm, and the feeding dropper is made of insulating materials.
According to the device, in one embodiment, the central liquid drop collecting pipe (3) is of an inverted cone structure, the pipe wall of the central liquid drop collecting pipe (3) is uniformly provided with expanding-contracting-expanding structural pore passages, the upper end of the central liquid drop collecting pipe (3) is welded with a lead, the lead is connected with a direct current power supply, and the central liquid drop collecting pipe (3) is made of conductive metal.
According to the device of the invention, in one embodiment, the ball valve (5) is structured as follows: the left valve (51) and the right valve (52) are matched, and the right end of the right valve (52) is welded with an adjusting handle (53); the left valve (51) is bonded at the lower end of the second cavity (4) and the upper end of the microwave reinforced channel (6), and the position of the right valve (52) can be adjusted through the adjusting handle (53); the bottommost end of the concave surface of the concave ball valve (5) forms 7-10 degrees with the horizontal plane.
According to the device, in one embodiment, a microwave emitting device (62) is arranged outside the microwave strengthening channel (6), the microwave emitting device is a microwave oscillator or a microwave magnetron, and the microwave strengthening channel (6) is made of PVC.
The invention further provides a method for modifying the surface of the liquid marble under the ultrasonic fluidization action of powder, which is applied to the device provided by the invention and comprises the following steps:
the method comprises the following steps: opening an air inlet valve (413) to form an ascending air flow in the first cavity (2) and the second cavity (4); an electrode plate (21) and a liquid drop central collecting pipe (3) are connected with electricity, and an electric field is formed between the first cavity (2) and the liquid drop central collecting pipe (3); starting a first ultrasonic transducer (421), a second ultrasonic transducer (422) and a third ultrasonic transducer (423) to generate ultrasonic fields in the first cavity (2) and the second cavity (4);
step two: powder enters the first cavity (2) through the powder inlet (8), enters the inner cavity of the central liquid drop collecting pipe (3) under the driving of an electric field, ascending air flow and ultrasonic waves and is orderly suspended on the central axis of the central liquid drop collecting pipe (3); dripping liquid drops into the inner cavity of the liquid drop central collecting pipe (3) through the feeding pipeline (1), wherein the liquid drops contact with the powder in the falling process, the surface of the micro liquid drops is coated and modified by the powder to form liquid marbles, and the liquid marbles stay at the position of the concave ball valve (5);
step three: closing the air inlet valve (413), closing a first ultrasonic transducer (421), a second ultrasonic transducer (422) and a third ultrasonic transducer (423), connecting the electrode plate (21) and the central liquid drop collecting pipe (3) in a potential reversal mode, adjusting the opening degree of the concave ball valve (5) after the L-shaped electrode plate (43) is connected with electricity, controlling the liquid marble to enter the microwave reinforced channel (6), adjusting the frequency, power and action time of the microwave emitted by the microwave emitting device (62) to adjust and control the size of the liquid marble, and collecting the liquid marble by an auxiliary collecting pipeline (61) at the lower part of the microwave reinforced channel (6);
step four: and closing the microwave transmitting device (62), cutting off the voltage of the electrode plate (21), opening the dustproof cover (7) after closing the concave ball valve (5), and collecting the residual powder in the cavity.
According to the method, in one embodiment, the method utilizes an electric field and an airflow field to drive powder to migrate towards the central axis of a central liquid drop collecting pipe (3) and suspend under the action of an ultrasonic field positioned at the central axis; and when the micro-liquid drops falling from the central axis of the liquid drop central collecting pipe (3) pass through the suspended powder, the powder is quickly coated on the surface of the micro-liquid drops, and the micro-liquid drops fall to the concave ball valve (5) to stay after forming liquid marbles.
According to the method, in one embodiment, the method controls the opening degree of the concave ball valve (5) to control the liquid marble to fall into the microwave strengthening channel (6), and controls the microwave intensity and the microwave action time in the microwave strengthening channel (6) through the microwave emitting device, so that the powder coating on the surface of the liquid marble is tighter, and the size of the liquid marble can be controlled.
The invention has the following beneficial effects:
the device of the invention has compact and reasonable structure and convenient operation. Through the superposition of an airflow field, an electric field and a sound field, the powder body diffuses in the first cavity under the action of the sound field, moves towards the axis under the action of the electric field, and can be uniformly suspended in the central axis in the first cavity to migrate and suspend under the action of the sound field. The liquid drops contact with the suspended powder in the falling process, and the powder can be uniformly coated on the surfaces of the micro-liquid drops; meanwhile, the microwave is utilized to reinforce the powder adhesion on the surface of the liquid marble, and the particle size of the liquid marble can be regulated and controlled, so that the diameter of the liquid marble reaches the submicron level.
In addition, the invention also has the following advantages:
(1) the powder is uniformly diffused in the cavity; through set up the micropore of admitting air and set up the micropore of giving vent to anger on the shield at the second cavity, produce updraft in the device, realize the diffusion effect of powder in the cavity.
(2) Accelerating the powder to migrate to the inner cavity of the central collecting pipe of the liquid drops by the electric field; by electrifying the central collecting pipe wall of the liquid drop and forming an electric field between the central collecting pipe wall of the liquid drop and the first cavity, under the action of the electric field force, the powder suspended in the first cavity migrates to the inner cavity of the central collecting pipe of the liquid drop through the expanding-contracting-expanding pore passage on the pipe wall of the central collecting pipe of the liquid drop, and the contact probability between the powder and the surface of the liquid drop is increased.
(3) Ultrasonic strengthening powder is attached to the surface of the liquid drop; through the ultrasonic transducers arranged at intervals on the periphery of the second cavity, a crossed sound field is generated at the central axis position of the liquid drop central collecting pipe, the vibration frequency of powder at the position of the crossed sound field is maximum, and the powder adhesion effect can be enhanced.
(4) The accumulation of a large amount of liquid marbles is avoided; the liquid marble stays at the concave ball valve after falling down, the opening degree of the concave ball valve can be adjusted through the handle, and the frequency of the liquid marble entering the microwave reinforced channel is regulated and controlled; the bottom of the concave ball valve forms an angle of 7-10 degrees with the horizontal plane, and the liquid marble stays at the bottom of the valve along the inclined plane after falling; when the valve is opened, the liquid marble falls along the inclined plane, so that the accumulation of the liquid marble is avoided.
(5) The size of the liquid marble is accurately regulated and controlled; the power and the acting time of the microwave are controlled, and the energy is transferred by the microwave, so that the powder on the surface of the liquid marble is coated more tightly; the liquid marble is heated by microwave, and partial liquid phase in the liquid marble is evaporated, so that the purpose of regulating and controlling the size of the liquid marble is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic overview of the structure of the apparatus according to the invention;
FIG. 2 is an enlarged partial view of portion A of the apparatus of FIG. 1;
FIG. 3 is a schematic view of the structure of a central collection tube for liquid droplets in the apparatus of the present invention.
FIG. 4 is an enlarged view of a portion B of the apparatus of FIG. 1;
in the figure: 1. a feed dropper; 2. a first cavity; 21. an electrode plate; 3. a central collection tube for the droplets; 4. a second cavity; 41. an air intake section; 411. air inlet micropores; 412. an air intake line; 413. an intake valve; 42. an ultrasonic emission section; 421. a first ultrasonic transducer; 422. a second ultrasonic transducer; 423. a third ultrasonic transducer; 43. an L-shaped electrode plate; 5. a concave ball valve; 51. a left valve; 52. a right valve; 53. an adjusting handle; 6. a microwave strengthening channel; 61. an auxiliary collection line; 62. a microwave emitting device; 7. a dust cover; 8. a powder inlet; 9. air outlet micropores; 10. an iron clamp; i, dashed area.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a device for modifying the surface of a liquid marble under the ultrasonic fluidization of powder, comprising: the device comprises a feeding dropper 1, a dust cover 7, a first cavity 2, a liquid drop central collecting pipe 3, a second cavity 4 and a microwave reinforced channel 6; the dustproof cover 7 is arranged above the first cavity 2, and a powder inlet 8 and a gas outlet micropore 9 are formed in the dustproof cover 7;
the feeding dropper 1 is clamped by an iron clamp 10 and communicated to the central liquid drop collecting pipe 3 through the dustproof cover 7; the central collection pipe 3 for the liquid drops is positioned inside the first cavity 2; the upper end of the central liquid drop collecting pipe 3 is connected to the dust cover 7, and the lower end of the central liquid drop collecting pipe is supported by the bottom of the second cavity 4; an electrode plate 21 is attached to the inner wall of the first cavity 2, and an electric field can be formed between the electrode plate 21 and the central liquid drop collecting pipe 3 in the first cavity 2; the second cavity 4 is in communication with the first cavity 2, and the second cavity 4 is connected to the microwave-enhanced channel 6 through a concave ball valve 5.
In one embodiment, the sidewall of the second cavity 4 is provided with an air inlet section 41 and an ultrasonic emission section 42 at intervals, and two sides of the second cavity 4 are of a symmetrical structure; as shown in fig. 2, the air inlet section 41 is provided with air inlet micropores 411, and the air flow speed is adjusted through an air inlet pipeline 412 and an air inlet valve 413, and the inside of the air inlet section 41 is provided with an "L" -shaped electrode plate 43; a first ultrasonic transducer 421, a second ultrasonic transducer 422 and a third ultrasonic transducer 423 are adhered to the outer side of the ultrasonic transmitting section 42; the inner diameter of the air inlet pipeline 412 is 8 mm-12 mm, the diameter of the air inlet micropores 411 is 1 mm-2 mm, and the air inlet pipeline is made of PVC materials.
In one embodiment, the ultrasonic waves emitted by the first ultrasonic transducer 421, the second ultrasonic transducer 422 and the third ultrasonic transducer 423 form a sound field in the second cavity 4, and the ultrasonic emitting section 42 is made of a metal material.
In one embodiment, the dust cover 7 is connected to the upper end of the first cavity 2 through a bolt, and a filter screen with a pore diameter far smaller than the diameter of the powder is arranged in the air outlet micropore 9 on the dust cover 7; the dustproof cover 7 is made of an insulating material; the upper end of the feeding dropper 1 is connected with a micro-channel injection pump, the inner diameter of the feeding dropper 1 is 0.3-0.8 mm, and the feeding dropper is made of insulating materials.
In one embodiment, the central liquid drop collecting pipe 3 is of an inverted cone structure, as shown in fig. 3, the pipe wall is uniformly distributed with "expanding-contracting-expanding" structure pore canals, the upper end of the central liquid drop collecting pipe 3 is welded with a lead, the lead is connected with a direct current power supply, and the central liquid drop collecting pipe 3 is made of conductive metal.
In one embodiment, as shown in fig. 4, the ball-and-socket valve 5 has a structure that: the valve is characterized by comprising a left valve 51 and a right valve 52 which are matched, wherein the right end of the right valve 52 is welded with an adjusting handle 53; the left valve 51 is adhered to the lower end of the second cavity 4 and the upper end of the microwave reinforcing channel 6, and the position of the right valve 52 can be adjusted by the adjusting handle 53; the bottommost end of the concave surface of the concave ball valve 5 is 7-10 degrees with the horizontal plane.
In one embodiment, a microwave emitting device 62 is disposed outside the microwave intensifying channel 6, the microwave emitting device 62 can be a microwave oscillator or a microwave magnetron, and the microwave intensifying channel 6 is made of PVC.
The specific process of the liquid marble surface modification device under the ultrasonic fluidization of powder in this embodiment is as follows:
the air inlet section valve 413 of the second cavity 4 is opened, and the airflow enters the cavity from the air inlet pipe 412 through the air inlet micropores 411, and an ascending airflow is formed in the whole cavity; meanwhile, the electrode plates 21 around the first cavity 2 and the liquid drop central collecting pipe 3 are connected with electricity to form a uniform electric field, and then modified powder particles are slowly added from the powder inlet 8 and are diffused in the whole cavity under the action of ascending airflow; due to the action of the electric field force, the powder migrates towards the central liquid droplet collecting tube 3 and migrates towards the inner side of the central liquid droplet collecting tube 3 through the pore channels of the tube wall of the central liquid droplet collecting tube 3. The ultrasonic transducers 421, 422, 423 are sequentially turned on from bottom to top, a crossed sound field is generated at a dotted line region i as shown in fig. 1, the powder has vibration with high frequency at the dotted line region i, at this time, the micro-droplets begin to drop from the feeding dropper 1, and the micro-droplets pass through the crossed sound field of the dotted line region i in fig. 1 in the falling process, and at this position, a large amount of powder is attached to the surface of the micro-droplets to form liquid marbles. The liquid marble continues to fall to the bottom end of the second chamber 4 and stays at the concave ball valve 5.
Continuing to open the air inlet valve 413 of the second chamber 4, the air flow enters the chamber from the air inlet pipe 412 through the air inlet micropores 411, and an ascending air flow is formed in the whole chamber; at the moment, the electrode plates 21 around the first cavity 2 are reversely connected with the voltage on the liquid drop central collecting pipe 3, meanwhile, the voltage of the L-shaped electrode plate 43 on the second cavity 4 is switched on, and the powder suspended in the cavities is migrated and collected towards the electrode plates under the action of electric field force.
And opening the microwave emitting device 62 around the microwave strengthening channel 6, and controlling the quantity of the liquid marbles entering the microwave strengthening channel 6 by adjusting the opening degree of the concave ball valve 5. The frequency, power and microwave duration of the microwave emitted by the microwave emitting device 62 are adjusted, so that the size of the liquid marble can be regulated and controlled, and the liquid marble is collected by the auxiliary collecting pipeline 61 at the lower part of the microwave reinforcing channel 6.
After all the liquid marbles are collected, the microwave transmitting device 62 is closed, the voltage of the electrode plate is cut off, the concave ball valve 5 is closed, the dustproof cover 7 is opened, and the residual powder in the cavity is collected and recovered.
Example two:
the invention further provides a method for modifying the surface of the liquid marble under the ultrasonic fluidization action of powder, which is applied to the device in the first embodiment and comprises the following steps:
the method comprises the following steps: opening the air inlet valve 413 to form an updraft in the first and second chambers 2 and 4; an electrode plate 21 and a liquid drop central collecting pipe 3 are connected with electricity, and an electric field is formed between the first cavity 2 and the liquid drop central collecting pipe 3; starting a first ultrasonic transducer 421, a second ultrasonic transducer 422 and a third ultrasonic transducer 423 to generate ultrasonic fields in the first cavity 2 and the second cavity 4;
step two: powder enters the first cavity 2 through the powder inlet 8, enters the inner cavity of the central liquid drop collecting pipe 3 under the driving of an airflow field, an electric field and ultrasonic waves, and is orderly suspended on the central axis of the central liquid drop collecting pipe 3; micro liquid drops are dripped into the inner cavity of the liquid drop central collecting pipe 3 through the feeding pipeline 1, the micro liquid drops contact with powder in the falling process, the surface of the micro liquid drops is coated and modified by the powder to form liquid marbles, and the liquid marbles stay at the concave ball valve 5;
step three: closing the air inlet valve 413, closing the first ultrasonic transducer 421, the second ultrasonic transducer 422 and the third ultrasonic transducer 423, connecting the electrode plate 21 and the liquid drop central collecting pipe 3 in a potential reversal manner, adjusting the opening degree of the concave ball valve 5 after the L-shaped electrode plate 43 is connected with electricity, controlling the liquid marbles to enter the microwave reinforced channel 6, adjusting the frequency, the power and the action time of the microwave emitted by the microwave emitting device 62 so as to regulate and control the size of the liquid marbles, and collecting the liquid marbles by the auxiliary collecting pipeline 61 at the lower part of the microwave reinforced channel 6;
step four: and closing the microwave transmitting device 62, cutting off the voltage of the electrode plate 21, opening the dustproof cover 7 after closing the concave ball valve 5, and collecting the powder remained in the cavity.
According to the method, in one embodiment, the method utilizes an airflow field and an electric field to drive the powder to migrate towards the central axis of the central liquid drop collecting pipe 3 and to suspend towards the central axis of the inner cavity of the central liquid drop collecting pipe 3 under the action of an ultrasonic field; and when the micro-droplets falling from the central axis of the droplet central collecting pipe 3 pass through the suspended powder, the powder is quickly coated on the surface of the micro-droplets to form liquid marbles, and finally falls to the concave ball valve 5 to stay.
According to the method, in one embodiment, the method controls the quantity of the liquid marbles falling into the microwave reinforced channel 6 by controlling the opening degree of the concave ball valve 5, and controls the microwave intensity and the microwave action time in the microwave reinforced channel 6, so that the powder coating on the surface of the micro-droplets is tighter, and the size of the liquid marbles can be regulated and controlled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A liquid marble surface modification device under powder ultrasonic fluidization is characterized by comprising a feeding dropper (1), a dust cover (7), a first cavity (2), a liquid drop central collecting pipe (3), a second cavity (4) and a microwave reinforced channel (6); wherein:
the dustproof cover (7) is arranged above the first cavity (2), and a powder inlet (8) and a gas outlet micropore (9) are formed in the dustproof cover (7);
the feeding dropper (1) is clamped by an iron clamp (10) and communicated to the central liquid drop collecting pipe (3) through the dustproof cover (7); the central collection pipe (3) for the droplets is located inside the first chamber (2); the upper end of the central liquid drop collecting pipe (3) is connected to the dustproof cover (7), and the lower end of the central liquid drop collecting pipe is supported by the bottom of the second cavity (4);
an electrode plate (21) is attached to the inner wall of the first cavity (2), and an electric field can be formed between the electrode plate (21) and the central liquid drop collecting pipe (3) in the first cavity (2);
the second cavity (4) is communicated with the first cavity (2), and the second cavity (4) is connected to the microwave enhancement channel (6) through a concave ball valve (5);
an air inlet section (41) and an ultrasonic emission section (42) are arranged on the side wall of the second cavity (4) at intervals, the air inlet section (41) is provided with air inlet micropores (411), the air flow speed is adjusted through an air inlet pipeline (412) and an air inlet valve (413), and an L-shaped electrode plate (43) is arranged on the inner side of the air inlet section (41); a first ultrasonic transducer (421), a second ultrasonic transducer (422) and a third ultrasonic transducer (423) are adhered to the outer side of the ultrasonic transmitting section (42); the inner diameter of the air inlet pipeline (412) is 8-12 mm, and the air inlet pipeline is made of PVC material; the diameter of the air inlet micropores (411) is 1-2 mm;
ultrasonic waves emitted by the first ultrasonic transducer (421), the second ultrasonic transducer (422) and the third ultrasonic transducer (423) form a sound field in the second cavity (4), and the ultrasonic emission section (42) is made of metal;
the central liquid drop collecting pipe (3) is of an inverted cone structure, pore canals of an expanding-contracting-expanding structure are uniformly distributed on the pipe wall of the central liquid drop collecting pipe, and a lead is welded at the upper end of the central liquid drop collecting pipe (3) and is connected with a direct current power supply; and the central collecting pipe (3) of the liquid drops is made of conductive metal.
2. The device for modifying the surface of the liquid marble under the ultrasonic fluidization of powder according to claim 1, wherein the dust cover (7) is connected to the upper end of the first cavity (2) through a bolt, and a filter screen with the aperture far smaller than the diameter of the powder is arranged in the air outlet micropore (9) on the dust cover (7); the dustproof cover (7) is made of an insulating material; the upper end of the feeding dropper (1) is connected with the micro-channel injection pump, the inner diameter of the feeding dropper (1) is 0.3-0.8 mm, and the feeding dropper is made of insulating materials.
3. The device for modifying the surface of a liquid marble under the ultrasonic fluidization of powder as claimed in claim 1, wherein the structure of the concave ball valve (5) is as follows: the left valve (51) and the right valve (52) are matched, and the right end of the right valve (52) is welded with an adjusting handle (53); the left valve (51) is bonded at the lower end of the second cavity (4) and the upper end of the microwave reinforced channel (6), and the position of the right valve (52) can be adjusted through the adjusting handle (53); the bottommost end of the concave surface of the concave ball valve (5) is 7-10 degrees from the horizontal plane.
4. The device for modifying the surface of the liquid marble under the ultrasonic fluidization of powder according to claim 1, wherein a microwave emitting device (62) is arranged outside the microwave strengthening channel (6), and the microwave emitting device (62) is selected from a microwave oscillator or a microwave magnetron; the microwave strengthening channel (6) is made of PVC materials.
5. A method for modifying the surface of a liquid marble under the action of ultrasonic fluidization of powder, which is applied to the device of any one of claims 1 to 4, and is characterized by comprising the following steps:
the method comprises the following steps: opening an air inlet valve (413) to form an ascending air flow in the first cavity (2) and the second cavity (4); an electrode plate (21) and a liquid drop central collecting pipe (3) are connected with electricity, and an electric field is formed between the first cavity (2) and the liquid drop central collecting pipe (3); starting a first ultrasonic transducer (421), a second ultrasonic transducer (422) and a third ultrasonic transducer (423) to generate ultrasonic fields in the first cavity (2) and the second cavity (4);
step two: powder enters the first cavity (2) through the powder inlet (8), enters the inner cavity of the central liquid drop collecting pipe (3) under the common driving of an airflow field, an electric field and a sound field, and is suspended in order on the central axis of the central liquid drop collecting pipe (3); micro liquid drops are dripped into the inner cavity of the liquid drop central collecting pipe (3) through the feeding pipeline (1), the micro liquid drops contact with powder in the falling process, the surface of the micro liquid drops is coated and modified by the powder to form liquid marbles, and the liquid marbles stay at the position of the concave ball valve (5);
step three: closing the air inlet valve (413), closing a first ultrasonic transducer (421), a second ultrasonic transducer (422) and a third ultrasonic transducer (423), connecting the electrode plate (21) and the central liquid droplet collecting pipe (3) in a potential reversal mode, adjusting the opening degree of the concave ball valve (5) after the L-shaped electrode plate (43) is connected with electricity, controlling liquid droplets to enter the microwave reinforced channel (6), adjusting the frequency, power and action time of microwave emitted by the microwave emitting device (62) to regulate and control the size of the liquid marbles, and collecting the liquid marbles by an auxiliary collecting pipeline (61) at the lower part of the microwave reinforced channel (6);
step four: and closing the microwave transmitting device (62), cutting off the voltage of the electrode plate (21), opening the dustproof cover (7) after closing the concave ball valve (5), and collecting the residual powder in the cavity.
6. The method according to claim 5, characterized in that the method utilizes an electric field and an air flow field to drive the modified powder to migrate towards the central axis of the central liquid drop collecting pipe (3) and generate suspension under the action of an ultrasonic field positioned at the central axis;
and when the micro-droplets falling from the central axis of the droplet central collecting pipe (3) pass through the suspended powder, the powder can be quickly coated on the surface of the micro-droplets and then fall to the concave ball valve (5) to stay after forming liquid marbles.
7. The method according to claim 5, wherein the method controls the liquid marble to fall into the microwave-enhanced channel (6) by controlling the opening degree of the concave ball valve (5), and controls the microwave intensity and the microwave action time in the microwave-enhanced channel (6) through a microwave emitting device, so that the powder coating on the surface of the liquid marble is tighter, and the purpose of regulating and controlling the size of the liquid marble is achieved.
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| US6620351B2 (en) * | 2000-05-24 | 2003-09-16 | Auburn University | Method of forming nanoparticles and microparticles of controllable size using supercritical fluids with enhanced mass transfer |
| JP4305729B2 (en) * | 2003-03-28 | 2009-07-29 | セイコーエプソン株式会社 | Liquid ejecting apparatus and microcapsule manufacturing method |
| CN107252665A (en) * | 2017-07-03 | 2017-10-17 | 中国石油大学(华东) | A kind of method for producing transparency liquid hoodle and liquid hoodle and application |
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