CN115744910A - Silene nanosheet for lubricant and preparation method and application thereof - Google Patents
Silene nanosheet for lubricant and preparation method and application thereof Download PDFInfo
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- 239000002135 nanosheet Substances 0.000 title claims abstract description 60
- 239000000314 lubricant Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 241000219289 Silene Species 0.000 title description 2
- 229910052918 calcium silicate Inorganic materials 0.000 title description 2
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000002244 precipitate Substances 0.000 claims abstract description 34
- 239000006228 supernatant Substances 0.000 claims abstract description 16
- 229910004706 CaSi2 Inorganic materials 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 239000000138 intercalating agent Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 64
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 239000002064 nanoplatelet Substances 0.000 claims description 11
- -1 silicon olefin Chemical class 0.000 claims description 11
- 238000001291 vacuum drying Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000009830 intercalation Methods 0.000 claims description 7
- 230000002687 intercalation Effects 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000000464 low-speed centrifugation Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000703 high-speed centrifugation Methods 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052754 neon Inorganic materials 0.000 claims description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000000523 sample Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims 3
- 229910004709 CaSi Inorganic materials 0.000 claims 1
- 239000002055 nanoplate Substances 0.000 claims 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 abstract description 8
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract 4
- 239000007788 liquid Substances 0.000 description 12
- 239000006185 dispersion Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 239000005457 ice water Substances 0.000 description 8
- 238000005461 lubrication Methods 0.000 description 6
- 238000009210 therapy by ultrasound Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
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- 239000007787 solid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000000089 atomic force micrograph Methods 0.000 description 3
- 229910021389 graphene Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000002604 ultrasonography Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101100460147 Sarcophaga bullata NEMS gene Proteins 0.000 description 1
- 229910008045 Si-Si Inorganic materials 0.000 description 1
- 229910006411 Si—Si Inorganic materials 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001451 molecular beam epitaxy Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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Abstract
The invention provides a silylene nanosheet for a lubricant, and a preparation method and application thereof. The preparation method of the silylene nanosheet comprises the following steps: mixing CaSi 2 And I 2 Adding the mixture into acetonitrile, stirring and reacting the mixture in a dark place under the atmosphere of inert gas, and centrifuging and washing the mixture to obtain a precipitate; placing the obtained precipitate in an intercalating agent for ultrasonic stripping; and then centrifuging at low speed, taking supernatant, centrifuging the supernatant at high speed, taking precipitate, and drying to obtain the silylene nanosheet for the lubricant. The invention adopts a chemical oxidation stripping method to effectively strip silylene to obtain nanosheets, and the nanosheets obtained are controllable in size and have good lubricating and antifriction properties.
Description
Technical Field
The invention relates to a lubricating agent-use silylene nanosheet and a preparation method and application thereof, and belongs to the field of wear reduction and lubrication of novel nanomaterials.
Background
Friction and wear are common in our daily lives and are the main causes of energy loss, mechanical failure and inefficiency, and the control and reduction of wear from friction is a long sought goal. The reduction of friction and wear is currently achieved mainly by the use of lubricants in liquid and solid form. With the gradual rise of novel micro-nano electromechanical devices (MEMS/NEMS) and sensing devices, friction and abrasion become important factors restricting the development of the micro-nano electromechanical devices, so that higher requirements are put forward on small-scale lubrication. Compared with a solid lubricant, the liquid lubricant is not environment-friendly, does not have good stability under extreme conditions of high load, high temperature, ultrahigh vacuum and the like, and cannot be used for novel micro-nano electromechanical devices. The two-dimensional layered material has the characteristics of small size, large specific surface area, good stability and the like, has excellent wear resistance and wear reduction performance, and is considered to be an excellent candidate material in the lubrication field. The method provides possibility for solving the problems of friction and abrasion of the micro-nano scale in the micro-nano device, and arouses wide attention of scientific researchers. Therefore, the continuous search for two-dimensional layered materials which can be used as novel solid lubricants is of great significance for the development of the lubrication field.
The silicon alkene is a layered silicon material with a honeycomb lattice structure similar to graphene, has many excellent properties of graphene, and therefore has great potential in the field of lubrication. At present, the research on the silylene is still in the beginning stage, researchers mainly carry out a great deal of research on the electrical characteristics of the silylene, the research on the tribological characteristics of the silylene is only reported, so far, the application of the silicon rare nanosheet in the field of antifriction lubrication is still not solved, and the preparation of the silylene is still the difficulty and the key of the research in the present stage. Different from the preparation of graphene, the interlayer Si-Si bonds in bulk silicon are covalent and strong in acting force, so that the silicon alkene cannot be effectively prepared by a mechanical stripping method. At present, the silylene is effectively prepared mainly by a molecular beam epitaxy deposition method, the synthesized silylene is limited by the nanometer size and is difficult to release from a matrix, and the research and the application of the silylene are seriously hindered. Therefore, a method for preparing the silylene nanosheets for the lubricant on a large scale is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a silylene nanosheet for a lubricant, and a preparation method and application thereof. The invention adopts a chemical oxidation stripping method to effectively strip silylene to obtain nanosheets, and the nanosheets obtained are controllable in size and have good lubricating and antifriction properties.
The technical scheme of the invention is as follows:
a lubricant is made of silylene nanosheets, the silylene nanosheets having a thickness of 1.2-50nm and a lateral dimension of 0.1-25 μm.
Preferably, according to the invention, the thickness of the silylene nanosheets is 6-30nm and the lateral dimension is 0.5-10 μm.
The preparation method of the silicon alkene nano-sheet for the lubricant comprises the following steps:
mixing CaSi 2 And I 2 Adding the mixture into acetonitrile, stirring and reacting the mixture in a dark place under the atmosphere of inert gas, and centrifuging and washing the mixture to obtain a precipitate; placing the obtained precipitate in an intercalation agent for ultrasonic stripping; and then centrifuging at a low speed, taking supernatant, centrifuging the supernatant at a high speed, taking precipitate, and drying to obtain the silylene nanosheet for the lubricant.
According to the invention, preferably, the CaSi 2 And I 2 In a molar ratio of 0.1 to 1:0.5 to 1; caSi 2 The ratio of the mass of (3) to the volume of acetonitrile is 3-4mg/mL.
According to a preferred embodiment of the invention, the inert gas is nitrogen, helium, neon or argon.
According to the invention, the stirring reaction temperature is 20-30 ℃, and the stirring reaction time is 18-25 days.
According to the invention, the intercalation agent is preferably one or a combination of more than two of acetone, N-methylpyrrolidone, N-dimethylformamide or dimethyl sulfoxide.
According to the invention, preferably, the CaSi 2 The mass of the intercalation agent is 5-10mg/mL.
According to the invention, the temperature of the ultrasonic stripping is 0-10 ℃; the power of the ultrasonic stripping is 200-600W, preferably 350-570W; the frequency of the ultrasonic stripping is 10-70KHz, preferably 15-60KHz; the ultrasonic stripping time is 5-14h, preferably 9-12h.
According to the invention, the ultrasound mode is preferably water bath ultrasound or probe ultrasound.
Preferably, the rotation speed of the low-speed centrifugation is 300-4500rpm, and the time of the low-speed centrifugation is 25-35min; the high-speed centrifugation is carried out at the rotating speed of 6000-12000rpm for 25-35min.
According to the invention, the drying is preferably vacuum drying, the temperature of the vacuum drying is 25-60 ℃, and the time of the vacuum drying is 1-48h.
The lubricant is applied to the lubricant to reduce friction and abrasion.
The invention has the following technical characteristics and beneficial effects:
1、CaSi 2 middle (Ca) 2+ ) n Ion layer and (Si) 2n ) 2n- The ionic layers are stacked alternately, and the electrostatic interaction between the two layers is strong. In acetonitrile I 2 In the presence of the original CaSi 2 Can be slightly oxidized without destroying the original Si skeleton; the CaSi 2 The slight oxidation of (2) is beneficial to the effective stripping of the subsequent silylene nanosheets. The invention selects specific I 2 As the oxidizing agent, it is suitable for oxidizing at room temperature; if the oxidizing power of the selected oxidizing agent is too strong, the structure of the silylene is changed, and if the oxidizing power of the selected oxidizing agent is too weak, the silylene cannot be effectively oxidized. In the oxidation process, acetonitrile is selected as a solvent, so that byproducts can be effectively removed, and the purity is improved.
2. In the preparation method, the selection of the intercalating agent, the ultrasonic frequency, the ultrasonic power, the ultrasonic time, the ultrasonic temperature and the like is more critical to obtaining the silylene nanosheets with different sizes and layers, and the appropriate intercalating agent, the higher ultrasonic frequency, the lower ultrasonic power, the appropriate ultrasonic time and the lower ultrasonic temperature are preferably selected, so that the layering effect of ultrasonic treatment is good under the condition, and the stripping efficiency can be effectively improved. The silicon alkene nanometer sheet with undamaged original structure can be successfully prepared in large quantity.
3. The various conditions and steps of the process of the invention as a whole act together to achieve the effects of the invention. In the experimental process, the selection of ultrasonic frequency, power, time, temperature, intercalation agent and the like in ultrasonic stripping is found, so that the preparation of the silylene nanosheets with different sizes and thicknesses becomes possible, and the size controllability of the silylene nanosheets is realized. The thickness of the silylene nanosheet obtained by the method relates to multilayer, thin layer and single layer, and the silylene nanosheet has good lubricating property, can be used as a potential solid lubricant, makes up the blank of silylene in the friction field, and enlarges the selection range of the solid lubricant.
Drawings
Fig. 1 is an atomic force microscope image of a silylene nanoplatelet prepared in example 1;
FIG. 2 is a linear relationship of load and friction for the silylene nanoplatelets prepared in example 1;
fig. 3 is an atomic force microscope image of the silylene nanoplatelets prepared in comparative example 2.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the following examples.
The methods described in the examples are conventional methods unless otherwise specified; the reagents used are commercially available without further indication.
Example 1
A preparation method of a silylene nanosheet for a lubricant comprises the following steps:
57mg of CaSi 2 Powder and 152mg I 2 Adding the powder into 16ml of anhydrous acetonitrile, and stirring for 21 days at 25 ℃ in a dark place under the protection of nitrogen; then, the obtained liquid is centrifuged for 30min at the rotating speed of 12000rpm, and precipitates are collected; adding a proper amount of anhydrous acetonitrile into the collected precipitate, centrifuging the mixture for 30min at the rotating speed of 12000rpm again, and collecting the precipitate; adding 8mL of N-methyl pyrrolidone into the obtained precipitate to form a dispersion, and ultrasonically stripping for 12h in an ice-water bath under the conditions that the temperature is 0 ℃, the power is 500W and the frequency is 20 kHZ; after the ultrasonic treatment is finished, centrifuging the obtained dispersion liquid for 30min at the rotating speed of 1000rpm, and collecting supernatant; and centrifuging the collected supernatant for 30min at the rotating speed of 12000rpm, taking a precipitate, and performing vacuum drying at 30 ℃ for 24h to obtain the silylene nanosheet.
An atomic force microscope picture of the silylene nanosheet for the lubricant prepared in the embodiment is shown in FIG. 1, and as can be seen from FIG. 1, the nanosheet with the transverse dimension of 1.5 μm and the thickness of 10-20nm can be prepared by the method.
The relationship between the force applied by the needle tip and the friction force of the surface of the silylene nanosheet is shown in fig. 2, wherein the slope represents a friction factor, the silylene nanosheet is obtained by linear fitting, the friction factor is about 0.2, and the silylene nanosheet has excellent lubricating performance.
Example 2
A preparation method of a silylene nanosheet for a lubricant comprises the following steps:
57mg of CaSi 2 Powder and 152mg I 2 Adding the powder into 16ml of anhydrous acetonitrile, and stirring for 21 days at 25 ℃ in a dark place under the protection of nitrogen; then, the obtained liquid is centrifuged for 30min at the rotating speed of 12000rpm, and precipitates are collected; adding a proper amount of anhydrous acetonitrile into the collected precipitate, centrifuging the mixture for 30min at the rotating speed of 12000rpm again, and collecting the precipitate; adding 8mL of N-methyl pyrrolidone into the obtained precipitate to form a dispersion, and ultrasonically stripping for 12h in an ice-water bath under the conditions that the temperature is 2 ℃, the power is 400W and the frequency is 20 kHZ; after the ultrasonic treatment is finished, centrifuging the obtained dispersion liquid for 30min at the rotating speed of 1000rpm, and collecting supernatant; and centrifuging the collected supernatant at 12000rpm for 30min, taking the precipitate, and drying in vacuum at 50 ℃ for 24h to obtain the silylene nanosheets.
Example 3
A preparation method of a silylene nanosheet for a lubricant comprises the following steps:
115mg of CaSi 2 Powder and 305mg I 2 Adding the powder into 32ml of anhydrous acetonitrile, and stirring for 21 days at 25 ℃ in a dark place under the protection of nitrogen; then, centrifuging the obtained liquid for 30min at the rotating speed of 10000rpm, and collecting precipitates; adding a proper amount of anhydrous acetonitrile into the collected precipitate, centrifuging for 30min at the rotating speed of 10000rpm again, and collecting the precipitate; adding 1695 ml of N, N-dimethyl formamide into the obtained precipitate to form a dispersion, and ultrasonically stripping in an ice-water bath for 12h under the conditions that the temperature is 0 ℃, the power is 500W and the frequency is 20 kHZ; after the ultrasonic treatment is finished, centrifuging the obtained dispersion liquid for 30min at the rotating speed of 1000rpm, and collecting supernatant; and centrifuging the collected supernatant for 30min at the rotation speed of 10000rpm, taking a precipitate, and performing vacuum drying for 12h at 50 ℃ to obtain the silylene nanosheet.
Example 4
A preparation method of silylene nanosheets for lubricants comprises the following steps:
287mg of CaSi 2 Powder and 762mg I 2 Adding the powder into 80ml of anhydrous acetonitrile, and stirring for 21 days at 25 ℃ in a dark place under the protection of nitrogen; centrifuging the obtained liquid at 12000rpm for 30min, and collecting precipitate; adding a proper amount of anhydrous acetonitrile into the collected precipitate, centrifuging for 30min at the rotating speed of 12000rpm again, and collecting the precipitate; adding 40mL of dimethyl sulfoxide into the obtained precipitate to form a dispersion, and carrying out ultrasonic stripping in an ice-water bath for 12h under the conditions of 0 ℃ temperature, 500W power and 20kHZ frequency; after the ultrasonic treatment is finished, centrifuging the obtained dispersion liquid at the rotating speed of 3000rpm for 30min, and collecting supernatant; and centrifuging the collected supernatant at 12000rpm for 30min, taking the precipitate, and drying in vacuum at 40 ℃ for 12h to obtain the silylene nanosheets.
Example 5
A preparation method of silylene nanosheets for lubricants comprises the following steps:
575mg of CaSi 2 Powder and 1524mg I 2 Adding the powder into 160ml of anhydrous acetonitrile, and stirring for 21 days at 25 ℃ in a dark place under the protection of nitrogen; then, the obtained liquid is centrifuged for 30min at the rotating speed of 12000rpm, and precipitates are collected; adding a proper amount of anhydrous acetonitrile into the collected precipitate, centrifuging for 30min at the rotating speed of 12000rpm again, and collecting the precipitate; adding 80mL of N-methyl pyrrolidone into the obtained precipitate to form a dispersion, and ultrasonically stripping for 9h in an ice-water bath under the conditions that the temperature is 0 ℃, the power is 500W and the frequency is 20 kHZ; centrifuging the obtained dispersion liquid for 30min at the rotating speed of 1000rpm after the ultrasonic treatment is finished, and collecting supernatant; and centrifuging the collected supernatant for 30min at the rotating speed of 12000rpm, taking a precipitate, and performing vacuum drying at 40 ℃ for 12h to obtain the silylene nanosheet.
Comparative example 1
A method of making a lubricant using silylene nanoplatelets, as in example 1, except that: the intercalation agent is ethanol; the other steps and conditions were identical to those of example 1.
The silicon alkene nanometer sheet dispersion liquid obtained by the comparative example after ultrasonic stripping has light color and poor dispersity and stability. The method has poor stripping effect, and finally the obtained silylene is a bulk material with micron-sized thickness, and a few multilayer and thin nanosheets are obtained.
Comparative example 2
A method of making a lubricant using silylene nanoplatelets, as in example 1, except that: ultrasonically stripping for 3 hours in ice water bath; the other steps and conditions were identical to those of example 1.
The preparation process adopts shorter ultrasonic time, so that bulk silylene is not fully stripped. The test shows that the uniform thin-layer nanosheet is less, and the atomic force microscope image of the silylene nanosheet obtained in the comparative example is shown in FIG. 3. As can be seen from FIG. 3, the layered structure of the silylene nanosheet is obvious, and the height of the thicker part can reach 100nm.
Comparative example 3
A method of making a lubricant using silylene nanoplatelets, as in example 1, except that: ultrasonically stripping for 16h in ice-water bath; the other steps and conditions were identical to those of example 1.
The preparation process adopts longer ultrasonic time, so that the silicon alkene nano-sheets have higher crushing degree, can not keep good lamellar structure, the surface of the silicon alkene nano-sheets is slightly oxidized to influence the test of the lubricating property of the silicon alkene nano-sheets, and the lubricating property of the surfaces of the silicon alkene nano-sheets is poor (the friction coefficient is more than 0.5).
Comparative example 4
A method of making a lubricant using silylene nanoplatelets, as in example 1, except that: ultrasonic stripping for 12 hours in an ice-water bath under the conditions that the ultrasonic stripping power is 90W and the frequency is 80 kHZ; the other steps and conditions were identical to those of example 1.
The thickness of the silylene nano sheet obtained by the comparative example is measured to be up to micron level, and the multilayer and thin-layer nano sheets are almost not available. Due to strong acting force between the silicon-alkene layers, the stripping effect is poor, the surface defects are more and the lubricating property is poor due to lower ultrasonic power.
Comparative example 5
A method of making silylene nanoplatelets for a lubricant, as in example 1, except that: the ultrasonic temperature is room temperature; the other steps and conditions were identical to those of example 1.
The silylene nanosheets obtained in the present comparative example were aggregated, and the thickness thereof was measured up to micron level, with few multilayer and thin layer nanosheets. This is because silylene is easily aggregated at room temperature, and is difficult to disperse uniformly, and thin sheets or a single layer of silylene cannot be obtained.
This summary merely illustrates some embodiments which are claimed, wherein one or more of the features recited in the claims can be combined with any one or more of the embodiments, and such combined embodiments are also within the scope of the present disclosure as if they were specifically recited in the disclosure.
Claims (10)
1. The silylene nanosheet for the lubricant is characterized in that the silylene nanosheet is 1.2-50nm in thickness and 0.1-25 microns in transverse dimension.
2. Silicone nanosheets for use in a lubricant according to claim 1, wherein the silicone nanosheets have a thickness of 6 to 30nm and a lateral dimension of 0.5 to 10 μm.
3. A process for the preparation of silylene nanoplatelets for use in a lubricant according to any of claims 1 or 2, comprising the steps of:
mixing CaSi 2 And I 2 Adding the mixture into acetonitrile, carrying out light-resistant stirring reaction under the atmosphere of inert gas, and centrifuging and washing to obtain a precipitate; placing the obtained precipitate in an intercalating agent for ultrasonic stripping; and then centrifuging at low speed, taking supernatant, centrifuging the supernatant at high speed, taking precipitate, and drying to obtain the silylene nanosheet for the lubricant.
4. Preparation method of silylene nanoplatelets for lubricants according to claim 3 characterized in that it comprises one or more of the following conditions:
i. the CaSi 2 And I 2 In a molar ratio of 0.1 to 1:0.5 to 1; caSi 2 The volume ratio of the mass of the acetonitrile to the acetonitrile is 3-4mg/mL;
ii. The inert gas is nitrogen, helium, neon or argon;
and iii, the stirring reaction temperature is 20-30 ℃, and the stirring reaction time is 18-25 days.
5. The preparation method of the lubricant silicon nanosheet, as set forth in claim 3, wherein the intercalating agent is one or a combination of two or more of acetone, N-methylpyrrolidone, N-dimethylformamide or dimethyl sulfoxide.
6. Method for preparing silylene nanoplatelets for lubricants according to claim 3, characterized in that the CaSi is 2 The ratio of the mass of the intercalation agent to the volume of the intercalation agent is 5-10mg/mL.
7. The preparation method of the silicon olefin nano-sheets for the lubricant according to claim 3, wherein the temperature of the ultrasonic stripping is 0-10 ℃; the power of the ultrasonic stripping is 200-600W, preferably 350-570W; the frequency of the ultrasonic stripping is 10-70KHz, preferably 15-60KHz; the ultrasonic stripping time is 5-14h, preferably 9-12h.
8. The preparation method of the silicon alkene nano-sheets for the lubricant according to claim 3, wherein the ultrasonic mode is water bath ultrasonic or probe ultrasonic.
9. The preparation method of the silylene nanosheets for the lubricant according to claim 3, wherein the rotation speed of the low-speed centrifugation is 300-4500rpm, and the time of the low-speed centrifugation is 25-35min; the rotating speed of the high-speed centrifugation is 6000-12000rpm, and the time of the high-speed centrifugation is 25-35min;
preferably, the drying is vacuum drying, the temperature of the vacuum drying is 25-60 ℃, and the time of the vacuum drying is 1-48h.
10. Use of a lubricant as defined in any one of claims 1 or 2, with silicone nanoplates for application to lubricants to reduce friction and wear.
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| US20200384422A1 (en) * | 2017-11-28 | 2020-12-10 | G2O Water Technologies Limited | Graphene or Graphene Derivative Membrane |
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| CN106554016A (en) * | 2016-10-21 | 2017-04-05 | 成都新柯力化工科技有限公司 | A kind of mechanical stripping prepares the application of the method and silylene film of silylene film |
| US20200384422A1 (en) * | 2017-11-28 | 2020-12-10 | G2O Water Technologies Limited | Graphene or Graphene Derivative Membrane |
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