CN114924098A - A flexible edgeless super-lubricating slider and its preparation method and application - Google Patents

Abstract

The invention discloses a flexible edge-free super-lubricating sliding block and a preparation method and application thereof, wherein the preparation method comprises the following steps: coating a layer of liquid ultraviolet curing glue on the top of the tip of the carrier; adhering the microspheres to the top of the tip of the carrier, and then irradiating the microspheres by using an ultraviolet lamp until the microspheres are cured; the microspheres on the carrier are scratched by sticky flexible polymer liquid drops to prepare flexible non-edge microspheres; and adhering a lubricating layer on the lower surface of the flexible edgeless microsphere to prepare the flexible edgeless super-lubricating slider. The method provided by the invention is simple and convenient, and when the method is applied to the detection of the interface interaction force, the problem of damage under the action of a sudden change load can be avoided due to the buffer action of the flexible macromolecules outside the microspheres. In addition, the microsphere is spherical and has no edge, the boundary friction is small, and the edge-free super-lubrication is in a real sense. The edge-free super-lubrication slider has extremely low abrasion, can effectively prolong the service life of the super-lubrication slider, and has wide adaptability.

Description

A flexible edgeless super-lubricating slider and its preparation method and application

technical field

The invention relates to the field of solid superlubrication, in particular to a flexible edgeless superlubricating slider and a preparation method and application thereof.

Background technique

Since the 1980s, surface detection technology has had important applications in many fields such as physics, chemistry, materials, life, and engineering. And the properties will change with the distance between the needle tip and the sample, so that different information of the sample can be obtained to achieve the purpose of detection. However, the current probe structures used by atomic force microscopy (AFM) have certain defects, and how to prepare ideal probe structures is still a challenge, for example, in the process of preparing graphene-coated probes by direct chemical vapor deposition growth method , the probes are easily damaged by high temperature; when graphene-coated probes are prepared using liquid-phase exfoliation graphene coating, mold-assisted or PMMA-assisted transfer methods, the formed layered heterojunctions inevitably suffer from contamination, resulting in Superlubricity failure; multilayer graphene nanoflakes are transferred to the probe by thermally assisted mechanical exfoliation or friction during the fabrication of graphene-wrapped probes, although contamination can be effectively avoided, after prolonged sliding tests , the multi-layer graphene nanosheets are easily detached from the probes; the process of fabricating graphite islands by photolithography is complicated and is not suitable for the measurement of atomic force microscopy (AFM). The measurement results produce errors, so a super-lubricated flexible slider is needed to avoid these problems.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a kind of flexible edgeless super-lubricating slider and its preparation method and application, so as to solve the problem that the probe graphene coating in the prior art is easy to fail, and the super-lubrication fails under sudden load. And the problem of short service life of ultra-lubrication.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a preparation method of a flexible edgeless super-lubricating slider is provided, comprising the following steps:

S1: Apply a layer of liquid UV-curable glue on the top of the carrier tip;

S2: Adhering the microspheres to the top of the tip of the carrier obtained in step S1, and then irradiating it with an ultraviolet lamp to cure;

S3: Scratch the microspheres on the tip of the carrier obtained in step S2 across the viscous flexible polymer droplets to prepare flexible edgeless microspheres;

S4: Adhering a lubricating layer on the lower surface of the flexible edgeless microspheres to obtain a flexible edgeless superlubricating slider.

The beneficial effects of the present invention are as follows: the present invention wraps viscous, flexible polymer droplets on the microspheres at the tip of the carrier to obtain microspheres with smooth surfaces and no obvious holes, and then utilizes the viscous adhesion of the polymer material to lubricate A flexible edgeless super-lubricating slider is prepared. The preparation method proposed by the invention is simple and convenient. When the prepared flexible edgeless ultra-lubricating slider is applied to the detection sample of an atomic force microscope probe, the needle tip is not in direct contact with the lubricating layer. , to a certain extent, protect the needle tip and prevent the needle tip from wearing. At the same time, the spherical structure makes it have a good dispersion effect on the impact force and stress. Coupled with the flexible polymer material, it can avoid the impact stress of the carrier tip becoming stronger. At the same time, the vibration transmitted from the carrier to the lubricating layer leads to the inaccuracy of the final scan and the problem that the sample is damaged during the back and forth scanning of the carrier. In addition, the overall shape of the slider of the present invention is spherical, which reduces the boundary friction. During the scanning process, the point-to-surface contact form between the slider and the sample realizes super lubrication, and no edge wear can effectively improve the ultra-slippery slider. long service life and wide adaptability.

On the basis of above-mentioned technical scheme, the present invention can also do following improvement:

Further, in step S1, the carrier is tungsten wire, ZnO nanorod, silicon dioxide wire or copper wire.

Further, the diameter of the carrier in step S1 is 0.1-0.5 mm.

Further, in step S1, the carrier tip is prepared by the following method: using electrochemical etching to etch a cone with a curvature radius of 10-40 μm at the end of the carrier to prepare the carrier tip.

Further, the diameter of the microspheres in step S2 is 0.1-500 μm.

Further, the microspheres in step S2 are silica microspheres, polymethyl methacrylate microspheres or polystyrene microspheres.

The beneficial effects of adopting the above-mentioned further technical solutions are: the spherical microspheres are used for the overall shape of the final slider, the spherical structure makes it have a good dispersion effect on the impact force and stress, and the spherical sliders interact with each other between the layers. In the force experiment, the contact area between the slider and the sample can be reduced, thereby reducing the interaction force between the interfaces and realizing the relative superlubrication of the point-to-point surface.

Further, the viscous flexible polymer droplets in step S3 are specifically PPC droplets, PC droplets, PCL droplets, PMMA droplets or PE droplets.

The beneficial effects of the above-mentioned further technical solutions are: the flexible polymer droplets form a polymer film on the surface of the microspheres, and the structure composed of the film and the microspheres can slow down the vibration and stress transmitted through the front end of the carrier, and at the same time the polymer film The interaction force between the film and the lubricating layer is strong, and the lubricating layer can be more firmly adhered to the surface.

Further, in step S3, the lubricating layer is all layered graphene, hexagonal boron nitride or disulfide.

Further, the width of the lubricating layer is 10-20 μm.

Further, the layered graphene is prepared by mechanical exfoliation.

The present invention also provides a flexible edgeless superlubricating slider prepared by the above-mentioned preparation method of the flexible edgeless superlubricating slider.

Further, the diameter of the flexible edgeless superlubricating slider is 15-25 μm.

The present invention also provides the application of the above-mentioned flexible edgeless super-lubricating slider on micro-nano devices.

The model of the above UV curing adhesive is Permabond UV645 or Permabond UV649.

The present invention has the following beneficial effects:

1. The flexible edgeless ultra-lubricating slider prepared by the present invention makes the probe tip not in direct contact with graphene. During the contact scanning process, the tip of the needle tip will not be worn due to contact, nor will the sample be damaged during the scanning process. , effectively improve the service life of the needle tip.

2. The spherical structure introduced by the present invention has a good dispersion effect on impact force and stress to a certain extent.

3. By introducing a flexible substrate, the present invention can reduce the vibration generated by the probe tip during the contact scanning process and the super-lubrication failure caused by the sudden change of the impact load at the front end of the carrier.

4. The flexible slider proposed by the present invention realizes the super-lubrication of the point-to-point surface, and the spherical slider reduces the contact area, weakens the influence of boundary friction, and finally reduces the error caused by external factors.

5. The preparation method of the flexible edgeless super-lubricating slider proposed by the present invention is simple, convenient, easy to operate, and has no fixed lubricating layer, which can be graphene or other nano-layers, and the materials used in the preparation process are also wide, with Broad applicability.

Description of drawings

Figure 1 is a schematic diagram of the preparation process of the flexible edgeless superlubricating slider.

Among them, 1. carrier tip; 2. UV curing glue; 3. microspheres; 4. flexible polymer droplets with viscosity; 5. lubricating layer.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention. If the specific conditions are not indicated in the examples, it is carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used without the manufacturer's indication are conventional products that can be purchased from the market.

The type of UV curing adhesive used below is Permabond UV645 or Permabond UV649.

Example 1:

A flexible edgeless super-lubricating slider, the preparation method of which includes the following steps (see Figure 1 for a schematic diagram of the preparation process):

S1: Wet the test paper with IPA (isopropyl alcohol), then wipe the glass slide, dip a small amount of silica microspheres on the glass slide with a toothpick, and look for silica microspheres with a diameter of 20 μm under the microscope ;

S2: Etch a tungsten wire with a diameter of 0.2 mm into a cone with a radius of curvature of 30 μm at the end of the tungsten wire by electrochemical etching to obtain the tip of the tungsten wire, and coat a layer of liquid UV curing on the top of the tip of the tungsten wire Then install the tungsten wire on the micro-nano mechanical manipulator, confirm the position of a single silica microsphere under the atomic force microscope, align the tip of the tungsten wire with the target microsphere, and slowly descend until the silica microsphere adheres On the top of the tip of the tungsten wire, irradiate it with a UV lamp until the UV curing glue is cured;

S3: Take another glass slide, wet the test paper with IPA, wipe the glass slide, drop a drop of PPC droplet on the surface of the slide glass, and scratch the microspheres on the tungsten wire after curing in step S2 across the PPC droplet to make to obtain flexible edgeless microspheres;

S4: The tungsten wire obtained in step S3 is operated by the micro-nano manipulator, look for a single-layer graphene layered material with a width of 15 μm (made by mechanical exfoliation method) under the microscope, align the tip of the tungsten wire, and slowly adjust the manipulator, Until contact, and then lifted quickly, a layer of graphene lubricating layer is adhered to the lower surface of the flexible edgeless microspheres to obtain a flexible edgeless ultra-lubricating slider.

Example 2:

A flexible edgeless super-lubricating slider, the preparation method of which comprises the following steps:

S1: Wet the test paper with IPA (isopropyl alcohol), then wipe the glass slide, dip a small amount of polymethyl methacrylate microspheres with a diameter of 0.1 μm with a toothpick and thinly coat it on the glass slide;

S2: The copper wire with a diameter of 0.1 mm is etched into a cone with a curvature radius of 10 μm at the end of the tungsten wire by electrochemical etching to obtain a copper wire tip, and a layer of liquid UV curing is applied on the top of the copper wire tip Then install the copper wire on the micro-nano mechanical manipulator, confirm the position of a single polymethyl methacrylate microsphere under an atomic force microscope, align the tip of the copper wire with the target microsphere, and slowly go down until the polymethyl methacrylate The methyl acrylate microspheres are adhered to the top of the tip of the copper wire, and then irradiated with a UV lamp until the UV curing glue is cured;

S3: Take another glass slide, wet the test paper with IPA, wipe the glass slide, drop a PC droplet on the surface of the slide glass, and scratch the microspheres on the tungsten wire after curing in step S2 across the PC droplet to make a to obtain flexible edgeless microspheres;

S4: Use the micro-nano manipulator to operate the copper wire obtained in step S3, look for a single-layer hexagonal boron nitride layered material with a width of 10 μm under the microscope, align the tip of the copper wire, slowly adjust the manipulator until contact, and then quickly Lifting, a layer of hexagonal boron nitride lubricating layer is adhered on the lower surface of the flexible edgeless microspheres to obtain a flexible edgeless super-lubricating slider.

Example 3:

A flexible edgeless super-lubricating slider, the preparation method of which comprises the following steps:

S1: Wet the test paper with IPA (isopropyl alcohol), then wipe the glass slide, dip a small amount of polystyrene microspheres with a diameter of 500 μm with a toothpick and thinly coat it on the glass slide;

S2: The silicon dioxide wire with a diameter of 0.5mm is etched into a cone with a curvature radius of 40 μm at the end of the tungsten wire by electrochemical etching to obtain the tip of the silicon dioxide wire, and the top of the tip of the silicon dioxide wire is coated with a Layer the liquid UV-curable glue, then install the silica wire on the micro-nano mechanical manipulator, confirm the position of a single polystyrene microsphere under the atomic force microscope, align the tip of the silica wire to the target microsphere, and slowly Go down until the polystyrene microspheres adhere to the top of the tip of the silica wire, and then irradiate it with a UV lamp until the UV curing glue is cured;

S3: Take another slide, soak the test paper with IPA, wipe the slide, drop a drop of PE on the surface of the slide, and scratch the microspheres on the silica wire after curing in step S2 across the PE drop , to prepare flexible edgeless microspheres;

S4: Use the micro-nano manipulator to operate the silicon dioxide wire obtained in step S3, look for a single-layer disulfide layered material with a width of 20 μm under the microscope, align the tip of the silicon dioxide wire, and slowly adjust the manipulator until contact , and then lifted quickly, a layer of disulfide lubricating layer was adhered to the lower surface of the flexible edgeless microspheres to obtain a flexible edgeless ultra-lubricating slider.

Comparative Example 1:

A graphene-wrapped tip probe, the preparation method comprising the following steps:

S1: Place the graphene on the silica substrate, in the environmental chamber of the atomic force microscope, lift the needle tip upward by 50 μm, and rapidly heat the graphene from 25 °C to 200 °C at a rate of 1 °C/s;

S2: During the heating process, let the needle tip hit the graphene, causing the needle tip to break near the apex, and after the break, a platform appears on the needle tip.

S3: Under the load of 500N, use the broken tip to scan the same area with the stepped edge, during the contact scanning process, the adhesion between the broken tip and the graphene will be greatly increased, and the graphene will roll up from the edge, The tip is peeled off from the substrate, and then gradually transferred and wrapped around the tip of the needle tip. Heating can drive off the water adsorbed on the tip and graphene surface, and promote the adhesion of the fractured tip to the graphene, resulting in a graphene-wrapped tip probe.

Test example

1. Put the probes prepared in Examples 1-3 and Comparative Example 1 on the AFM scanner for experiment. The specific method is: under the same conditions, the reciprocating friction measurement is carried out on the graphene basal plane, and the probe after the experiment is placed on the AFM scanner. The tip wear was observed under an atomic force microscope.

The results are: the diameter of the tip of the comparative example 1 increases significantly after the scanning is completed. This is due to the lateral force between the tip of the needle tip and the base during the sliding process. Under the action of stress, the lubricating layer on the surface of the tip will quickly adapt to the shearing conditions and be closely bonded to the surface, promoting the formation of a nano-scale friction layer. As the scanning movement progresses, it gradually moves to the edge of the tip, thereby increasing the diameter of the tip; while the flexible edgeless super-smooth sliders prepared in Examples 1-3 have no significant change in the tip diameter after the experiment, and the needle tip Also no wear.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. a preparation method of a flexible edgeless super-lubricating slider, is characterized in that, comprises the following steps: S1: apply a layer of liquid UV-curable glue (2) on top of the carrier tip (1); S2: Adhering the microspheres (3) to the top of the tip of the carrier obtained in step S1, and then irradiating it with an ultraviolet lamp to cure; S3: Scratch the microspheres (3) on the carrier tip (1) obtained in step S2 across the viscous flexible polymer droplets (4) to prepare flexible edgeless microspheres; S4: Adhering the lubricating layer (5) on the lower surface of the flexible edgeless microspheres to obtain a flexible edgeless super-lubricating slider. 2 . The method for preparing a flexible edgeless super-lubricating slider according to claim 1 , wherein in step S1 , the carrier is a tungsten wire, a ZnO nanorod, a silicon dioxide wire or a copper wire. 3 . 3 . The method for preparing a flexible edgeless super-lubricating slider according to claim 1 , wherein the diameter of the carrier in step S1 is 0.1-0.5 mm. 4 . 4. The preparation method of the flexible edgeless super-lubricating slider according to claim 1, characterized in that, in step S1, the carrier tip (1) is obtained by the following method: utilizing electrochemical corrosion to etch a radius of curvature at the carrier end The carrier tip (1) is made into a 10-40 [mu]m cone. 5 . The method for preparing a flexible edgeless super-lubricating slider according to claim 1 , wherein the diameter of the microspheres ( 3 ) in step S2 is 0.1-500 μm. 6 . 6. The preparation method of the flexible edgeless super-lubricating slider according to claim 1 or 5, characterized in that in step S2, the microspheres (3) are silicon dioxide microspheres, polymethyl methacrylate microspheres or polystyrene microspheres. 7. The method for preparing a flexible edgeless super-lubricating slider according to claim 1, wherein the viscous flexible polymer droplets (4) in step S3 are PPC droplets, PC droplets, and PCL droplets , PMMA droplets or PE droplets. 8 . The method for preparing a flexible edgeless super-lubricating slider according to claim 1 , wherein the lubricating layer ( 5 ) in step S3 is layered graphene, hexagonal boron nitride or disulfide. 9 . 9. A flexible edgeless super-lubricating slider prepared by the method for preparing a flexible edgeless super-lubricating slider according to any one of claims 1-8. 10. Application of the flexible edgeless superlubricating slider of claim 9 in micro-nano devices.

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