CN111692209A - Magnetic fluid controllable support micro platform based on extreme infiltration interface and manufacturing method - Google Patents
Magnetic fluid controllable support micro platform based on extreme infiltration interface and manufacturing method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0402—Bearings not otherwise provided for using magnetic or electric supporting means combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/041—Passive magnetic bearings with permanent magnets on one part attracting the other part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/0436—Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2201/00—Polymeric substrate or laminate
- B05D2201/02—Polymeric substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2350/00—Pretreatment of the substrate
- B05D2350/30—Change of the surface
- B05D2350/33—Roughening
- B05D2350/38—Roughening by mechanical means
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- F16C2202/00—Solid materials defined by their properties
- F16C2202/30—Electric properties; Magnetic properties
- F16C2202/40—Magnetic
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- F16C2202/66—Water repelling
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
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- F16C2208/32—Polytetrafluorethylene [PTFE]
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- F16C2223/00—Surface treatments; Hardening; Coating
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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Abstract
The invention discloses a magnetofluid controllable supporting micro platform based on an extreme infiltration interface and a manufacturing method thereof, wherein the controllable supporting micro platform comprises a PTFE plate, a magnet array, a water-based magnetofluid and a supporting plate; the upper surface of the PTFE plate is a super-hydrophobic extreme infiltration interface, and a plurality of limiting areas with super-hydrophilic extreme infiltration interfaces adopted on the surface are uniformly arranged on the upper surface of the PTFE plate to form hydrophilic and hydrophobic textures; dropwise adding the water-based magnetofluid on the surface of the hydrophilic and hydrophobic texture; the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas; the support plate is arranged on the water-based magnetic fluid. The magnetofluid is stably limited in a design area through an extreme infiltration boundary, and the magnetofluid supporting technology is realized by regulating and controlling the intensity of magnetic field to form liquid balls with different heights and rigidities.
Description
Technical Field
The invention relates to the field of micro electro mechanical systems, in particular to a magnetofluid controllable supporting micro platform based on an extreme infiltration interface and a manufacturing method thereof.
Background
In recent years, with the rapid development of micro-electro-mechanical systems (MEMS), various micro-sensors, micro-actuators, and micro-mechanical structures have been designed, fabricated, and widely used. MEMS devices have the significant advantage that a given function can be realized in a compact structural size (millimeter, micron scale). The magnetic fluid is a novel functional material, and is a stable colloid generally formed by mixing magnetic solid particles with the diameter of nanometer magnitude (less than 10 nanometers), base carrier fluid and surfactant. Compared with common liquid, the magnetic fluid has the liquidity of the liquid and the magnetism of a solid magnetic material; can be adsorbed and fixed at a designated position under the action of an external magnetic field. Its unique properties find application in many areas. The literature [1,2] reports that the direct contact of the surfaces of friction pairs is reduced by using the static magnetic force generated after the magnetic fluid is magnetized in an external magnetic field, and the tribological performance of the friction pairs is obviously improved. Patent [3] reports a magnetic fluid supporting platform, but overall structure size is big, is hardly applicable to the micro-device, and this supporting platform is great to the volume demand of magnetic fluid (long-time use can arouse the nanoparticle reunion, leads to supporting failure), and patent [3] reports a supporting structure based on magnetic fluid bearing, is subject to magnet size and magnetic field intensity, and the magnetic fluid will be extruded the contact zone after pressure increase or the device slope, leads to supporting failure. How to limit the magnetic fluid in a designated area to provide support, and the magnetic fluid cannot escape from a contact area after being pressed is the key for realizing the micro magnetic fluid support technology.
[ REFERENCE ] to
[1]S.G.E. Lampaert, J.W. Spronck, R.A.J. van Ostayen, Load and stiffnessof a planar ferrofluid pocket bearing, Proceedings of the Institution ofMechanical Engineers, Part J: Journal of Engineering Tribology, 2017, 232(1):14-25.
[2]Z. Wang, Z. Hu, W. Huang, X. Wang, Elastic support of magnetic fluidsbearing, Journal of Physics D: Applied Physics, 2017, 50(43): 435004.
[3] Huzhengdong, daling, wangzhuang, hula, huang wei, wangzhe, magnetofluid bearing support structure, publication no: CN 110779865A. .
Disclosure of Invention
The invention aims to solve the technical problem of providing a magnetofluid controllable support micro platform based on an extreme infiltration interface and a manufacturing method aiming at the defects related in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
the magnetofluid controllable support micro platform based on the extreme infiltration interface comprises a PTFE plate, a magnet array, a water-based magnetofluid and a support plate;
the upper surface of the PTFE plate is a super-hydrophobic extreme infiltration interface, and a plurality of limiting areas with super-hydrophilic extreme infiltration interfaces adopted on the surfaces are uniformly arranged on the upper surface of the PTFE plate to form hydrophilic and hydrophobic textures for limiting the positions of the water-based magnetic fluid liquid drops on the PTFE plate;
the water-based magnetofluid is dripped on the surface of the hydrophilic and hydrophobic texture, so that the liquid drops of the water-based magnetofluid are limited in a limiting area;
the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas, and is used for generating a magnetic field to adsorb the water-based magnetic fluid droplets on the corresponding limiting areas so as to be more stable and generate a supporting force;
the support plate is arranged on the water-based magnetic fluid and used for supporting external articles.
The invention also discloses a manufacturing method of the magnetofluid controllable support micro platform based on the extreme infiltration interface, which comprises the following steps:
step 1), adopting a micro-abrasive jet flow processing technology to roughen the upper surface of the PTFE plate, so that the upper surface of the PTFE plate becomes a rough surface with the roughness Ra being a preset roughness threshold value;
step 2), preparing a heptadecafluorodecyltriethoxysilane aqueous solution, soaking the roughened PTFE plate at normal temperature, and drying to enable the upper surface of the PTFE plate to be a super-hydrophobic surface;
step 3), processing the superhydrophobic surface of the PTFE plate by adopting an ultraviolet laser engraving technology, forming a plurality of limit areas which are uniformly distributed and provided with superhydrophilic surfaces on the superhydrophobic surface of the PTFE to form a superhydrophobic/superhydrophilic extreme infiltration interface;
step 4), dropwise adding the water-based magnetic fluid on the surface of the hydrophilic and hydrophobic texture, and arranging magnet groups which correspond to the limiting areas one by one under the PTFE plate, wherein each magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the limiting areas corresponding to the magnets, so that a magnetic field is generated to adsorb the water-based magnetic fluid droplets on the limiting areas, and the water-based magnetic fluid droplets are more stable and generate a supporting force;
and 5) arranging a support plate on the water-based magnetic fluid.
As a further optimization scheme of the manufacturing method of the magnetofluid controllable support micro platform based on the extreme infiltration interface, the specific method for roughening the upper surface of the PTFE plate by adopting the micro abrasive jet processing technology in the step 1) is as follows:
when a micro-abrasive multiphase jet flow aqueous solution is prepared, silicon carbide particles are selected as the solid micro-abrasive, and the mass fraction of the abrasive is 3 wt.%;
the jet parameters were as follows: the spraying distance is 15mm, the spraying angle is 70 degrees, the spraying pressure is 0.2MPa, and the uniform spraying processing is carried out for 3 min.
As a further optimization scheme of the manufacturing method of the magnetofluid controllable support micro platform based on the extreme infiltration interface, the preset roughness threshold value in the step 1) is 1.2 mm.
As a further optimization scheme of the manufacturing method of the magnetofluid controllable support micro platform based on the extreme infiltration interface, the step 1) adopts the following steps for replacement:
and (3) sanding and polishing the upper surface of the PTFE plate by using sand paper, so that the upper surface of the PTFE plate becomes a rough surface with the roughness Ra being a preset roughness threshold value.
As a further optimization scheme of the manufacturing method of the magnetofluid controllable support micro platform based on the extreme infiltration interface, the step 2) comprises the following detailed steps:
preparing a heptadecafluorodecyl triethoxysilane aqueous solution with the mass fraction of 5 wt.%, soaking the roughened PTFE base material for 30min at normal temperature, and drying at 90 ℃ to enable the upper surface of the PTFE plate to be a super-hydrophobic surface.
As a further optimization scheme of the manufacturing method of the magnetofluid controllable support micro platform based on the extreme infiltration interface, the detailed steps of processing the limit area by adopting the ultraviolet laser engraving technology in the step 3) are as follows:
the output power is 3W, the processing speed is 500mm/s, the processing frequency is 40KHz, the pulse width is 0.5ms, and the processing times are 3.
The invention also discloses another magnetofluid controllable supporting micro platform based on the extreme infiltration interface, which comprises a PTFE plate, a magnet array, an oil-based magnetofluid and a supporting plate;
the upper surface of the PTFE plate is a super-oleophobic extreme infiltration interface, and a plurality of limiting areas with super-oleophilic extreme infiltration interfaces adopted on the surface are uniformly arranged on the upper surface of the PTFE plate to form oleophilic and hydrophobic textures which are used for limiting the positions of oil-based magnetic fluid liquid drops on the PTFE plate;
the oil-based magnetic fluid is dripped on the surface of the oleophilic and oleophobic texture, so that the oil-based magnetic fluid liquid drop is limited in a limit area;
the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas, and is used for generating a magnetic field to adsorb the oil-based magnetic fluid droplets on the corresponding limiting areas so as to be more stable and generate a supporting force;
the support plate is arranged on the oil-based magnetic fluid and used for supporting external articles.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the magnetofluid is stably limited in a design area through an extreme infiltration boundary, and the magnetofluid supporting technology is realized by regulating and controlling the intensity of magnetic field to form liquid balls with different heights and rigidities.
Drawings
FIG. 1 (a) is a schematic diagram comparing magnetic fluid on super-hydrophilic, super-hydrophobic/super-hydrophilic gradient surface;
FIG. 1 (b) is a schematic diagram showing the comparison of the shapes of the magnetic fluid under different external magnetic field strengths;
FIG. 1 (c) is a schematic diagram of the shape of the magnetofluid on the super-hydrophobic/super-hydrophilic gradient surface under the action of an external magnetic field;
FIG. 2 is a schematic diagram of the structure of the magnetofluid controllable support micro platform.
In the figure, 1-magnetofluid, 2-magnet, 3-PTFE, 4-base, 5-limiting block and 6-supporting platform.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
The invention discloses a magnetofluid controllable support micro platform based on an extreme infiltration interface, wherein magnetofluid is stably limited in a design area through an extreme infiltration boundary, and liquid balls with different heights and rigidities are formed by regulating and controlling the intensity of magnetic field; the magnetofluid controllable support micro platform based on the extreme infiltration interface comprises a PTFE plate, a magnet array, a water-based magnetofluid and a support plate;
the upper surface of the PTFE plate is a super-hydrophobic extreme infiltration interface, and a plurality of limiting areas with super-hydrophilic extreme infiltration interfaces adopted on the surfaces are uniformly arranged on the upper surface of the PTFE plate to form hydrophilic and hydrophobic textures for limiting the positions of the water-based magnetic fluid liquid drops on the PTFE plate;
the water-based magnetofluid is dripped on the surface of the hydrophilic and hydrophobic texture, so that the liquid drops of the water-based magnetofluid are limited in a limiting area;
the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas, and is used for generating a magnetic field to adsorb the water-based magnetic fluid droplets on the corresponding limiting areas so as to be more stable and generate a supporting force;
the support plate is arranged on the water-based magnetic fluid and used for supporting external articles.
The invention also discloses another magnetofluid controllable supporting micro platform based on the extreme infiltration interface, which comprises a PTFE plate, a magnet array, an oil-based magnetofluid and a supporting plate;
the upper surface of the PTFE plate is a super-oleophobic extreme infiltration interface, and a plurality of limiting areas with super-oleophilic extreme infiltration interfaces adopted on the surface are uniformly arranged on the upper surface of the PTFE plate to form oleophilic and hydrophobic textures which are used for limiting the positions of oil-based magnetic fluid liquid drops on the PTFE plate;
the oil-based magnetic fluid is dripped on the surface of the oleophilic and oleophobic texture, so that the oil-based magnetic fluid liquid drop is limited in a limit area;
the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas, and is used for generating a magnetic field to adsorb the oil-based magnetic fluid droplets on the corresponding limiting areas so as to be more stable and generate a supporting force;
the support plate is arranged on the oil-based magnetic fluid and used for supporting external articles.
Taking a common water-based magnetofluid as an example, the common water-based magnetofluid can be spread into a water film on a super-hydrophilic surface (the contact angle is less than 10 degrees) and cannot be gathered; it can be agglomerated into a ball drop on a super-hydrophobic surface (the contact angle is more than 150 degrees) and is easy to roll on the surface. The two characteristics are combined, and a super-hydrophobic structure is constructed around the magnetic fluid, so that the magnetic fluid can be limited in a super-hydrophilic area without depending on a magnetic field; as shown in fig. 1 a. Meanwhile, by changing the intensity of the external magnetic field, the geometric morphology of the magnetic fluid in the form of spherical drops can be changed to form a stable state, as shown in fig. 1 b.
By combining fig. 1a and 1b, a controllable support of the magnetic fluid in micro-size can be obtained, as shown in fig. 1c below. The support structure combines the advantages of fig. 1a and 1b, and on one hand, the magnetofluid is limited in a hydrophilic area through a surface wetting gradient to provide stable liquid ball support; on the other hand, under the action of the external magnetic field, a strong supporting force is provided for the magnetic fluid.
And preparing an extreme infiltration interface by using polytetrafluoroethylene as a base material. The specific implementation steps are as follows:
step 1) adopting a micro-abrasive jet flow processing technology to carry out texturing treatment on the PTFE base material. Preparing a micro-abrasive multiphase jet flow aqueous solution, wherein solid micro-abrasive is silicon carbide particles (2000 meshes) and the mass fraction of the abrasive is 3 wt.%; the jet parameters were as follows: the spraying distance is 15mm, the spraying angle is 70 degrees, the spraying pressure is 0.2MPa, and the uniform spraying processing is carried out for 3 min; obtaining a rough surface with a roughness Ra of about 1.2 mm; the rough surface can likewise be obtained by sanding.
Step 2) preparing a heptadecafluorodecyltriethoxysilane (FAS 17) aqueous solution with the mass fraction of 5 wt.%, soaking the roughened PTFE substrate at normal temperature for 30min, and drying at 90 ℃ to obtain a superhydrophobic surface, a red region in the figure 1.
Step 3) designing a corresponding pattern according to the diameter range of the micro magnet of 0.5-10 mm, and performing localized processing on the super-hydrophobic surface prepared in the step 2 by adopting an ultraviolet laser engraving technology, wherein the specific processing parameters are as follows: the output power is 3W, the processing speed is 500mm/s, the processing frequency is 40KHz, the pulse width is 0.5ms, and the processing times are 3 times; thereby obtaining a hydrophilic surface (blue area in fig. 1 c) on the designated area of the surface of the super-hydrophobic PTFE substrate, and forming a super-hydrophobic/super-hydrophilic extremely wetting interface.
Step 4) the designed controllable magnetic fluid supporting structure is shown in fig. 2, wherein a single size of a magnet (N35 NdFeB) is a cylinder with the diameter of 2mm and the thickness of 1mm, a magnet array is installed in a base, and a small hole is reserved below the magnet array for facilitating disassembly; the PTFE plate is arranged above the magnet, and the surface of the PTFE substrate is of hydrophilic and hydrophobic texture; the proper amount of the magnetofluid is dripped on the surface of the texture, the magnetofluid liquid drops are limited in a super-hydrophilic area, the magnetic field enables the liquid drops to be adsorbed more stably and generate supporting force, and the shape and the supporting force of the liquid drops can be changed by changing the size of the magnetic field;
and 5), placing the supporting platform on the magnetic fluid liquid drop, and limiting the horizontal displacement of the supporting platform through a limiting block, wherein the limiting block is connected with the base through a screw.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The magnetofluid controllable support micro platform based on the extreme infiltration interface is characterized by comprising a PTFE plate, a magnet array, a water-based magnetofluid and a support plate;
the upper surface of the PTFE plate is a super-hydrophobic extreme infiltration interface, and a plurality of limiting areas with super-hydrophilic extreme infiltration interfaces adopted on the surfaces are uniformly arranged on the upper surface of the PTFE plate to form hydrophilic and hydrophobic textures for limiting the positions of the water-based magnetic fluid liquid drops on the PTFE plate;
the water-based magnetofluid is dripped on the surface of the hydrophilic and hydrophobic texture, so that the liquid drops of the water-based magnetofluid are limited in a limiting area;
the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas, and is used for generating a magnetic field to adsorb the water-based magnetic fluid droplets on the corresponding limiting areas so as to be more stable and generate a supporting force;
the support plate is arranged on the water-based magnetic fluid and used for supporting external articles.
2. The manufacturing method of the magnetofluid controllable supporting micro platform based on the extreme wetting interface as claimed in claim 1, characterized by comprising the following steps:
step 1), adopting a micro-abrasive jet flow processing technology to roughen the upper surface of the PTFE plate, so that the upper surface of the PTFE plate becomes a rough surface with the roughness Ra being a preset roughness threshold value;
step 2), preparing a heptadecafluorodecyltriethoxysilane aqueous solution, soaking the roughened PTFE plate at normal temperature, and drying to enable the upper surface of the PTFE plate to be a super-hydrophobic surface;
step 3), processing the superhydrophobic surface of the PTFE plate by adopting an ultraviolet laser engraving technology, forming a plurality of limit areas which are uniformly distributed and provided with superhydrophilic surfaces on the superhydrophobic surface of the PTFE to form a superhydrophobic/superhydrophilic extreme infiltration interface;
step 4), dropwise adding the water-based magnetic fluid on the surface of the hydrophilic and hydrophobic texture, and arranging magnet groups which correspond to the limiting areas one by one under the PTFE plate, wherein each magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the limiting areas corresponding to the magnets, so that a magnetic field is generated to adsorb the water-based magnetic fluid droplets on the limiting areas, and the water-based magnetic fluid droplets are more stable and generate a supporting force;
and 5) arranging a support plate on the water-based magnetic fluid.
3. The manufacturing method of the magnetic fluid controllable support micro platform based on the extreme infiltration interface according to claim 2, wherein the specific method for roughening the upper surface of the PTFE plate by adopting the micro abrasive jet machining technology in the step 1) is as follows:
when a micro-abrasive multiphase jet flow aqueous solution is prepared, silicon carbide particles are selected as the solid micro-abrasive, and the mass fraction of the abrasive is 3 wt.%;
the jet parameters were as follows: the spraying distance is 15mm, the spraying angle is 70 degrees, the spraying pressure is 0.2MPa, and the uniform spraying processing is carried out for 3 min.
4. The manufacturing method of the magnetic fluid controllable support micro platform based on the extreme wetting interface according to claim 2, wherein the preset roughness threshold in the step 1) is 1.2 mm.
5. The manufacturing method of the magnetic fluid controllable support micro platform based on the extreme wetting interface as claimed in claim 2, wherein the step 1) is replaced by the following steps:
and (3) sanding and polishing the upper surface of the PTFE plate by using sand paper, so that the upper surface of the PTFE plate becomes a rough surface with the roughness Ra being a preset roughness threshold value.
6. The manufacturing method of the magnetofluid controllable support micro platform based on the extreme wetting interface as claimed in claim 2, wherein the detailed steps of the step 2) are as follows:
preparing a heptadecafluorodecyl triethoxysilane aqueous solution with the mass fraction of 5 wt.%, soaking the roughened PTFE base material for 30min at normal temperature, and drying at 90 ℃ to enable the upper surface of the PTFE plate to be a super-hydrophobic surface.
7. The manufacturing method of the magnetic fluid controllable support micro platform based on the extreme infiltration interface as claimed in claim 2, wherein the detailed steps of processing the limit area by adopting the ultraviolet laser engraving technology in the step 3) are as follows:
the output power is 3W, the processing speed is 500mm/s, the processing frequency is 40KHz, the pulse width is 0.5ms, and the processing times are 3.
8. The magnetofluid controllable supporting micro platform based on the extreme infiltration interface is characterized by comprising a PTFE plate, a magnet array, an oil-based magnetofluid and a supporting plate;
the upper surface of the PTFE plate is a super-oleophobic extreme infiltration interface, and a plurality of limiting areas with super-oleophilic extreme infiltration interfaces adopted on the surface are uniformly arranged on the upper surface of the PTFE plate to form oleophilic and hydrophobic textures which are used for limiting the positions of oil-based magnetic fluid liquid drops on the PTFE plate;
the oil-based magnetic fluid is dripped on the surface of the oleophilic and oleophobic texture, so that the oil-based magnetic fluid liquid drop is limited in a limit area;
the magnet array comprises a plurality of magnet groups which are arranged below the PTFE plate and correspond to the limiting areas one by one; the magnet group comprises a plurality of magnets which are sequentially stacked and have the same shape as the corresponding limiting areas, and is used for generating a magnetic field to adsorb the oil-based magnetic fluid droplets on the corresponding limiting areas so as to be more stable and generate a supporting force;
the support plate is arranged on the oil-based magnetic fluid and used for supporting external articles.
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