阅读说明：本技术 一种利用激光束在液体中驱动石墨烯的方法 (Method for driving graphene in liquid by using laser beam ) 是由 王雷 赵秋玲 王霞 于 2020-05-14 设计创作，主要内容包括：本发明属于激光技术领域,涉及一种利用激光束在液体中驱动石墨烯的方法,将石墨烯材料浸入液体中,用激光束辐照液体中的石墨烯材料,实现其在液体中的激光直接驱动；采用激光辐照石墨烯的方法实现激光束对块体石墨烯材料在液体中的直接驱动,并以石墨烯为载具还能实现对其它材料和物体在液体中的直接驱动,不需要任何燃料即可实现石墨烯或者其它关联物体的非接触式水下驱动,驱动力远远大于光压(辐射压)驱动,整个过程简单高效,绿色环保,应用前景广阔。(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 for irradiating the graphene by the laser is adopted to realize the direct drive of the laser beam to the bulk graphene material in the liquid, the graphene is used as a carrier, the direct drive of other materials and objects in the liquid can also be realized, the non-contact underwater drive of the graphene or other related objects can be realized without any fuel, the driving force is far greater than the light pressure (radiation pressure) drive, the whole process is simple and efficient, the method is green and environment-friendly, and the application prospect is wide.)

1. A method for driving graphene in liquid by utilizing laser beams is characterized by comprising the following specific steps: the graphene material is immersed in liquid, and laser beams are used for irradiating the graphene material in the liquid, so that the graphene material is directly driven by the lasers in the liquid.

2. The method for driving graphene in liquid by using laser beam according to claim 1, wherein the graphene material has a size of nanometer, micrometer, millimeter, centimeter or meter, and is a graphene nanosheet or three-dimensional network structure composed of more than 1 layer of graphene.

3. The method for driving graphene in liquid by using laser beam as claimed in claim 1, wherein the size of the graphene material is determined according to the size of laser beam spot and laser power density, wherein the size of the laser beam spot is close to or larger than that of the graphene, and the laser power density is determined according to the size of the laser beam spot and the size of the grapheneGreater than 250mW/cm²。

4. The method for driving graphene in liquid by using laser beam according to claim 1, wherein the laser beam is continuous laser or pulse laser; the wavelength is in the ultraviolet to infrared band.

5. The method for driving graphene in liquid by using laser beam as claimed in claim 1, wherein the liquid 5 comprises normal tap water, deionized water, seawater and oil.

6. The method according to claim 1, wherein the laser direct driving distance of the graphene material in the liquid is up to centimeter to meter.

The technical field is as follows:

the invention belongs to the technical field of laser, and relates to a method for driving graphene in liquid by using laser beams.

Background art:

since the concept of solar sail is proposed, the light radiation driving has attracted great interest to the scientific community and the public, and the maximum advantage of the radiation pressure (light pressure) driving is that no additional fuel and energy are needed to be carried, only the light is irradiated; but the biggest disadvantage is that the radiation pressure is extremely small, and strong radiation thrust is difficult to generate, thereby limiting the practicability. Although the development of optical drive technology based on radiation pressure is currently subject to some limitations, the search for optical drive has never been stopped. Until now, the laser ablation propulsion technology has been concerned at the end of the 20 th century, and the basic principle is that an ablative substance (target) is heated under laser irradiation to generate high-temperature plasma, and the jet along the direction opposite to the incident direction of a light beam generates a 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 ablative substance (target) such as metal. However, most of laser driving techniques have been directed to a gas or vacuum environment so far, and little research has been made on a laser long distance driving technique applicable to a liquid environment, for example, CN02128212.9 provides a method and apparatus for constantly establishing an energy distribution of a laser beam on an irradiation surface and uniformly irradiating the laser beam to the entire irradiation surface, forming a plurality of laser beams in an elliptical or rectangular shape on the irradiation surface with an optical system, and emitting the plurality of laser beams while the irradiation surface is moved in a first direction, and the irradiation surface is moved in a second direction, and emitting the plurality of laser beams while the irradiation surface is moved 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 content is as follows:

the invention aims to overcome the defects in the prior art, and provides a method for driving graphene in liquid by using laser beams, which adopts the laser beams to irradiate the graphene in the liquid to realize the movement of the graphene in the liquid.

In order to achieve the above purpose, the specific process of driving graphene in liquid by using laser beam in the invention is as follows: the graphene material is immersed in liquid, and laser beams are used for irradiating the graphene material in the liquid, so that the graphene material is directly driven by the lasers in the liquid.

The graphene material is in a nano-scale, micron-scale, millimeter-scale, centimeter-scale or meter-scale size, and is a graphene micro-nano sheet or three-dimensional network structure formed by more than 1 layer of graphene.

The size of the graphene capable of being driven by the method is determined according to the size of a laser beam spot and the laser power densityDetermining that the laser power density should be greater than 250mW/cm, wherein the size of the laser beam spot is close to or greater than the size of the graphene²。

The laser beam is continuous laser or pulse laser, preferably continuous laser; the wavelength is in the ultraviolet to infrared range, preferably the visible range.

The liquid of the present invention should have high laser transmittance (transparency), including common tap water, deionized water, seawater, oil, etc., but not limited to the listed liquids, and the liquid is also applicable to other liquids not listed, and preferably the liquid has high laser transmittance.

The direct laser driving distance of the graphene material in liquid can reach centimeter to meter, and the driving distance is not limited as long as the laser power density meets the requirement in principle.

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 graphene and other materials (such as magnesium aluminum alloy), but the other materials are not limited to the listed materials, and other materials or objects not listed are also applicable.

Compared with the prior art, the method overcomes the defect that the block material is difficult to obviously drive due to small optical radiation pressure in the prior art, realizes the direct drive of the block graphene material in liquid by adopting a laser irradiation graphene method, can also realize the direct drive of other materials and objects in the liquid by taking the graphene as a carrier, can realize the non-contact underwater drive of the graphene or other related objects without any fuel, has the driving force far greater than the optical pressure (radiation pressure) drive, and has the advantages of simple and efficient whole process, environmental protection and wide application prospect.

Description of the drawings:

fig. 1 is a flow chart illustrating the working principle of driving graphene in liquid by using laser beams according to the present invention.

Fig. 2 is a photograph of an experimental apparatus for driving graphene in liquid by laser in embodiment 1 of the present invention, in which a laser 1, a laser beam 2, a plane mirror 3, a graphene material 4, and deionized water 5 are used.

Fig. 3 is a photograph of the initial position of graphene in deionized water before laser irradiation in example 1 of the present invention.

Fig. 4 is a photograph of the position of graphene in deionized water during laser irradiation in example 1 of the present invention.

Fig. 5 is a photograph of 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 of the initial position of graphene in deionized water at a certain moment in example 2 of the present invention.

Fig. 7 is a photograph of the final position of graphene after free-falling in deionized water for 15 seconds in the absence of laser irradiation in example 2 of the present invention.

In fig. 3-7, the circles mark the position of graphene in the liquid.

The specific implementation mode is as follows:

in order to better explain the present invention and to facilitate understanding of the technical solutions, the present invention is further described in detail by way of examples with reference to the accompanying drawings.