CN111720280B - Method for driving graphene in liquid by using laser beam - Google Patents
Method for driving graphene in liquid by using laser beam Download PDFInfo
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- CN111720280B CN111720280B CN202010406139.1A CN202010406139A CN111720280B CN 111720280 B CN111720280 B CN 111720280B CN 202010406139 A CN202010406139 A CN 202010406139A CN 111720280 B CN111720280 B CN 111720280B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0093—Electro-thermal plasma thrusters, i.e. thrusters heating the particles in a plasma
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Abstract
The invention belongs to the technical field of laser, and relates to a method for driving graphene in liquid by utilizing laser beams, which comprises the steps of immersing a graphene material in the liquid, and irradiating the graphene material in the liquid by using the laser beams to realize the direct laser driving of the graphene material in the liquid; the method of irradiating the graphene by the laser is adopted to realize the direct driving of the laser beam on the bulk graphene material in the liquid, and the graphene is used as a carrier to realize the direct driving of other materials and objects in the liquid, so that the non-contact underwater driving of the graphene or other related objects can be realized without any fuel, the driving force is far greater than the driving force of light pressure (radiation pressure), and the whole process is simple and efficient, green and environment-friendly and has wide application prospect.
Description
Technical field:
the invention belongs to the technical field of laser, and relates to a method for driving graphene in liquid by using laser beams.
The background technology is as follows:
since the concept of solar sails, light radiation driving has attracted great interest in the scientific community and the public, and the greatest advantage of radiation pressure (light pressure) driving is that no additional fuel or energy is required to be carried, so long as illumination is available; however, the biggest disadvantage is that the radiation pressure is extremely small, and the strong radiation thrust is difficult to generate, which limits the practicability. While the development of light driving technology based on radiation pressure is currently limited, the search for light driving has never stopped. The laser ablation advancing technology has received attention at the end of the 20 th century, and the basic principle is that an ablation substance (target material) is heated under laser irradiation to generate high-temperature plasma, and the high-temperature plasma is ejected along the direction opposite to the incidence direction of a light beam to generate driving force, and although the technology avoids carrying chemical fuel with huge volume and mass, the generation of the driving force still needs to carry specific ablation substance (target material) such as metal. However, so far, the laser driving technique has been much little studied for a gas or vacuum environment, and a laser long distance driving technique applicable in a liquid environment, such as CN02128212.9, has provided a method and apparatus for constantly establishing an energy distribution of laser beams on an irradiation surface and uniformly irradiating the laser beams to the entire irradiation surface, forming the shape of the plurality of laser beams on the irradiation surface into an elliptical shape or a rectangular shape with an optical system, and emitting the plurality of laser beams while the irradiation surface is moving in a first direction, and the irradiation surface is moving in a second direction, and emitting the plurality of laser beams while the irradiation surface is moving in a direction opposite to the first direction; the plurality of laser beams may be emitted while the irradiation surface is moved in the first direction, and the plurality of laser beams may be emitted while the irradiation surface is moved in a direction opposite to the first direction, and the irradiation surface may also be moved in the second direction.
The invention comprises the following steps:
the invention aims to overcome the defects in the prior art, and designs and provides a method for driving graphene in liquid by using laser beams, wherein the graphene in the liquid is irradiated by the laser beams, so that the movement of the graphene in the liquid is realized.
In order to achieve the above object, the specific process of driving graphene in liquid by using laser beam of the present invention is: immersing the graphene material in the liquid, and irradiating the graphene material in the liquid by using a laser beam to realize the laser direct driving of the graphene material in the liquid.
The size of the graphene material is nano-scale, micron-scale, millimeter-scale, centimeter-scale or meter-scale, and the graphene material is a graphene micro-nano sheet or a three-dimensional network structure formed by more than 1 layer of graphene.
The size of the graphene which can be driven by the invention is determined according to the size of the laser beam light spot and the laser power density, wherein the size of the laser beam light spot is close to or larger than the size of the graphene, and the laser power density is larger than 250mW/cm 2 。
The laser beam is continuous laser or pulse laser, preferably continuous laser; the wavelength is in the ultraviolet to infrared band, preferably the visible band.
The liquid according to the invention should have a high laser light transmittance (transparency), including but not limited to ordinary tap water, deionized water, seawater, oil, etc., and is equally applicable to other non-enumerated liquids, preferably a liquid having a high laser light transmittance.
The direct laser driving distance of the graphene material in the liquid can reach centimeter level to meter level, and in principle, the driving distance is not limited as long as the laser power density meets the requirement.
The graphene material can also be used as a carrier of other objects to realize laser driving in liquid, such as embedding other materials (such as metal powder) in graphene or connecting the graphene with other materials (such as magnesium aluminum alloy), but the other materials are not limited to the listed materials, and other unrecited materials or objects are applicable.
Compared with the prior art, the method overcomes the defect that the bulk material is difficult to drive obviously due to small light radiation pressure in the prior art, adopts the method of irradiating graphene by laser to realize the direct driving of the laser beam on the bulk graphene material in the liquid, adopts the graphene as a carrier to realize the direct driving of other materials and objects in the liquid, can realize the non-contact underwater driving of the graphene or other related objects without any fuel, has the driving force far greater than the light pressure (radiation pressure) driving, and has the advantages of simple and efficient whole process, green and environment-friendly performance and wide application prospect.
Description of the drawings:
fig. 1 is a flow chart of the working principle of driving graphene in liquid by using laser beams according to the invention.
Fig. 2 is a photograph of an experimental apparatus for laser driving graphene in a liquid in example 1 of the present invention, wherein a 1-laser, a 2-laser beam, a 3-plane mirror, a 4-graphene material, and 5-deionized water.
Fig. 3 is a photograph showing the initial position of graphene in deionized water before laser irradiation in example 1 of the present invention.
Fig. 4 is a photograph showing the position of graphene in deionized water during laser irradiation according to example 1 of the present invention.
Fig. 5 is a photograph showing the final position of graphene in deionized water after laser irradiation for 13 seconds in example 1 of the present invention.
Fig. 6 is a photograph showing the initial position of graphene in deionized water at a certain time in embodiment 2 of the present invention.
Fig. 7 is a photograph of the final position of graphene in deionized water after it has fallen freely for 15 seconds in the absence of laser irradiation in example 2 of the present invention.
In fig. 3-7, circles indicate the location of graphene in the liquid.
The specific embodiment is as follows:
for a better description of the present invention, it is convenient to understand the technical solutions, and the present invention will be further described in detail below by way of examples with reference to the accompanying drawings.
Example 1:
the specific process of driving graphene in deionized water by using a laser beam in the embodiment comprises the following steps:
(1) Immersing the graphene material 4 in deionized water 5;
(2) The laser beam 2 emitted by the laser 1 is emitted into the deionized water in the step (1) from bottom to top along the vertical direction after passing through the plane reflector 3, the graphene immersed in the laser beam is irradiated, the spot diameter of the laser beam is about 2mm, the power is 75mW, the laser beam is continuous laser with the wavelength of 488nm, and the graphene material 4 is positioned in the position shown in fig. 3 before laser irradiation; as can be seen from fig. 4, the laser irradiation can have a significant upward driving effect on graphene in deionized water; after 13 seconds of laser irradiation, the graphene reaches the position shown in fig. 5, and efficient driving of the graphene in deionized water is realized.
Example 2:
in this embodiment, experiments were performed on the movement situation of graphene in deionized water when no laser irradiation is performed, and at a certain moment, the graphene is in the position shown in fig. 6, and as can be seen from fig. 7, the graphene moves downwards under the action of gravity when no laser irradiation is performed, and this embodiment again proves that the laser irradiation does have an additional obvious driving effect on the graphene.
Example 3:
in this embodiment, a glass substrate is placed on the propagation path of the light beam passing through deionized water in embodiment 1 so as to deposit graphene, and the transfer of the laser beam to a large number of micro-nano-scale graphene materials is realized in the liquid phase by using the technology in embodiment 1, so that the laser printing of the graphene materials on the substrate is realized.
As can be seen from embodiments 1,2 and 3, the method for driving graphene in liquid by using a laser beam in the embodiment realizes rapid driving of graphene in liquid by irradiating graphene in liquid by using the laser beam, and has the advantages of high driving speed and obvious effect; the method is simple, efficient, green and environment-friendly, and has wide application prospect.
Claims (4)
1. A method for driving graphene in liquid by using laser beams is characterized by comprising the following specific steps: immersing a graphene material in a liquid, enabling a laser beam emitted by a laser to pass through a plane reflector and then to be emitted into the liquid from bottom to top along a vertical direction, and irradiating the graphene material in the liquid to realize laser direct driving of the graphene material in the liquid, wherein the laser direct driving distance of the graphene material in the liquid reaches a centimeter level to a meter level; wherein the liquid comprises common tap water, deionized water, seawater and oil.
2. The method for driving graphene in a liquid by using a laser beam according to claim 1, wherein the size of the graphene material is nano-scale, micro-scale, millimeter-scale, centimeter-scale or meter-scale, and the graphene material is a graphene micro-nano sheet or a three-dimensional network structure composed of more than 1 layer of graphene.
3. The method of driving graphene in a liquid using a laser beam according to claim 1, wherein the size of the graphene material is determined according to the size of the laser beam spot and the laser power density, wherein the size of the laser beam spot is close to or larger than the size of the graphene, and the laser power density is greater than 250mW/cm 2 。
4. Method for driving graphene in a liquid with a laser beam according to claim 1, characterized in that the laser beam is a continuous laser or a pulsed laser; the wavelength is in the ultraviolet to infrared band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010406139.1A CN111720280B (en) | 2020-05-14 | 2020-05-14 | Method for driving graphene in liquid by using laser beam |
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| CN111720280B true CN111720280B (en) | 2023-07-21 |
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