CN115971470A - Method for preparing liquid metal nanoparticles by ultrasonic stirring method - Google Patents
Method for preparing liquid metal nanoparticles by ultrasonic stirring method Download PDFInfo
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- CN115971470A CN115971470A CN202211598059.6A CN202211598059A CN115971470A CN 115971470 A CN115971470 A CN 115971470A CN 202211598059 A CN202211598059 A CN 202211598059A CN 115971470 A CN115971470 A CN 115971470A
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- 229910001338 liquidmetal Inorganic materials 0.000 title claims abstract description 115
- 239000002082 metal nanoparticle Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000003756 stirring Methods 0.000 title claims abstract description 39
- 239000004094 surface-active agent Substances 0.000 claims abstract description 39
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000006185 dispersion Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 21
- 229910052733 gallium Inorganic materials 0.000 claims description 21
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- 238000010438 heat treatment Methods 0.000 claims description 12
- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
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- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 2
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- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
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Abstract
The invention discloses a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, wherein the method comprises the following steps: a simple ultrasonic stirrer is manufactured by a user; providing a room temperature liquid metal and an ethanol/surfactant dispersion; and adding the liquid metal into an ethanol/surfactant system, starting an ultrasonic stirrer, and obtaining the liquid metal nanoparticles after a certain time. The invention solves the problems of low efficiency, larger particle size, high energy consumption and poorer stability of the existing ultrasonic method for preparing the liquid metal nano particles.
Description
Technical Field
The invention relates to the technical field of liquid metal nanoparticles, in particular to a method for preparing liquid metal nanoparticles by an ultrasonic stirring method.
Background
Gallium-based liquid metal is an alloy formed by doping gallium metal as a main element into other specific metals, and can be kept in a liquid state at room temperature. The gallium-based liquid metal not only retains the basic properties of the traditional metal, such as high thermal conductivity and high electrical conductivity; meanwhile, the liquid has the characteristics of liquid, such as good fluidity and low viscosity; and compared with other liquid metals such as Hg, naK and the like, the gallium-based liquid metal has the advantages of low toxicity, low volatility, environmental friendliness and the like. Due to its unique properties, gallium-based liquid metals have been used in the fields of soft robots, flexible circuits, catalytic materials, energy storage materials, biomedical and chemical sensors, etc.
However, liquid metal nanocrystallization applications have been limited by their high surface tension, resulting in liquid metal droplets that are easily oxidized in water to aggregate with each other. The physical dispersion method assisted by the ultrasonic is widely applied to the aspects of sample mixing in a laboratory, medical diagnosis and the like. The liquid metal is also suitable for preparing nano particles by an ultrasonic dispersion method due to the liquid characteristic of the liquid metal.
The literature "preparation and application of liquid metal nano droplets" discloses a method for preparing liquid metal nano droplets by using an ultrasonic method, and researches the effects of different surfactants on the preparation of liquid metal nano droplets. The result shows that the size and the shape of the liquid metal nano liquid drop prepared by the ultrasonic system added with the surfactant are more uniform compared with those of the liquid metal nano liquid drop prepared by the deionized water system, the surfactant can stabilize the liquid metal nano liquid drop in the system, regulate and control the size of the liquid drop, and is beneficial to forming stable liquid metal colloid. The literature further studies the influence of the liquid metal content on the stability of liquid metal nano droplets, and with dopamine as a surfactant, the concentration of dopamine is 1mg/mL, and the liquid metal is 0.2g, 0.4g, 0.6g, 0.8g, 1.0g and 3.0g, and the self-assembly of droplets with different liquid metal contents is obviously different. When the liquid metal is 1.0g, the film on the surface of the liquid drop is thinnest; when the amount of the liquid metal is 0.2g, the liquid drops are coated by the polydopamine and are agglomerated together; from 0.4 to 0.8g, the thinning of the polydopamine film can be obviously seen; when the liquid metal is 3.0g, the surface of the liquid drop is also coated by thicker polydopamine. Therefore, when the concentration of the dopamine is 1.0mg/mL and the concentration of the liquid metal is 1.0g, the liquid metal can be rapidly split into nanometer droplets by ultrasonic waves, and the dopamine serves as a stabilizer to stabilize the suspension, so that the system stability is the best.
The document "preparation of ultrasonic drive liquid metal nano motor and motion control research" also discloses a method for preparing liquid metal nanospheres by ultrasonic crushing, and researches the influence of ultrasonic power, time and surface stabilizer on the preparation of the liquid metal nanospheres. The results show that the particle size of the nano particles can be reduced by prolonging the ultrasonic time or increasing the ultrasonic power; the liquid metal nano-particles with the surfaces modified by the mercapto compounds have better stability effect.
The existing ultrasonic method for preparing the liquid metal nano-particles can obtain the liquid metal nano-particles with different particle sizes and uniform particle sizes by regulating and controlling factors such as ultrasonic power, ultrasonic time, types and contents of surfactants and the like. However, the existing method still has the problems of low efficiency, small yield, need of using a large amount of surfactant, poor stability and the like in the preparation of liquid metal nanoparticles, and particularly has the problem that the nanoparticles are easy to agglomerate after being placed for a long time.
In view of the above, there is a need in the art to develop a new method for preparing liquid metal nanoparticles to solve the above problems in the prior art.
Disclosure of Invention
The invention provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method aiming at solving the problems of low efficiency, low yield, large amount of surfactant, non-uniform particle size and poor stability in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for preparing liquid metal nanoparticles by an ultrasonic stirring method comprises the following steps:
(1) A self-made simple ultrasonic stirrer;
(2) Providing a room temperature liquid metal and an ethanol/surfactant dispersion;
(3) And adding the liquid metal into an ethanol/surfactant system, putting a magnetic stirrer, starting an ultrasonic stirrer, and obtaining the liquid metal nanoparticles after a certain time.
In the invention, the self-made ultrasonic stirrer is utilized to realize two functions of ultrasonic vibration and stirring and shearing at the same time, and liquid metal can be effectively dispersed into liquid drops with the grain diameter of dozens to hundreds of nanometers in a certain time under the coordination of an ethanol/surfactant dispersion system; meanwhile, the surfactant is used for wrapping the tiny liquid metal nano liquid drops to prevent the liquid metal nano liquid drops from being re-fused into a large block of liquid metal; the method can obtain the liquid metal nano-particles with uniform particle size and high stability by only using a small amount of surfactant; the obtained liquid metal nanoparticles can not be agglomerated after being placed for 48 hours at room temperature.
Further, in the step (1), the simple ultrasonic mixer comprises a stainless steel container, a heating wire, magnetic steel driven by a micro motor and an ultrasonic transducer. The heating wire provides the heating function, micro motor driven magnet steel provides the stirring function, ultrasonic transducer provides the ultrasonic vibration function.
Further, in the step (1), an electric heating wire for providing a heating function and magnetic steel driven by a micro motor for providing a stirring function are assembled at the bottom of a stainless steel container of the simple ultrasonic stirrer; preferably, the heating wire and the micro motor are respectively provided with a slide rheostat; particularly preferably, the heating wire and the micro motor are equipped with a temperature sensor and a rotation speed sensor, respectively.
Further, in the step (1), an ultrasonic transducer for providing an ultrasonic vibration function is assembled at the side part of the stainless steel container of the simple ultrasonic stirrer; preferably, the number of the ultrasonic transducers to be mounted is two or more; it is particularly preferred that all ultrasonic transducers are mounted on the same side of the stainless steel vessel with the centres of the transducers on the same horizontal line.
Further, in the step (2), the room-temperature liquid metal is one or more of metal gallium, gallium-indium alloy and gallium-indium-tin alloy; the metal gallium, the gallium indium alloy and the gallium indium tin alloy can be commercial products, and can also be prepared according to the existing preparation method.
Further, in the step (2), the concentration of the surfactant in the ethanol/surfactant dispersion system is 0.1-15 mmol/L; preferably 0.5-2 mmol/L; most preferably 1mmol/L.
Further, in the step (2), in the ethanol/surfactant dispersion system, the surfactant is one or more of a thiol surfactant, an amine surfactant and a carboxyl surfactant; preferred thiol surfactants are n-octadecanethiol, lauryl mercaptan or n-octyl mercaptan; the preferable amine surfactant is n-octylamine; a preferred carboxylic surfactant is stearic acid.
Further, in the step (3), the mass-to-volume ratio of the liquid metal to the ethanol/surfactant dispersion system is 1; preferably 1; most preferably 1.
Further, in the step (3), the water level of the clear water poured into the ultrasonic mixer container is higher than the upper edge of the side ultrasonic transducer; preferably with the water level at two thirds of the volume in the container.
Further, in the step (3), the ultrasonic power is 10-500W, preferably 60-100W, and the ultrasonic stirring time is 1-12 hours, preferably 4-5 hours; the water temperature in the container is kept between 10 and 45 ℃; the stirring speed is 100-1000 r/min; preferably 400 to 800 revolutions per minute.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which utilizes a self-made simple ultrasonic stirrer to simultaneously carry out ultrasonic and stirring treatment on liquid metal, and then is matched with a surfactant to wrap tiny nanoparticles, thereby obviously improving the preparation efficiency of the liquid metal nanoparticles, reducing the particle size and enhancing the stability of the nanoparticles; the method relates to simple self-made ultrasonic stirring equipment, is low in cost and practical, can be used for dispersing liquid metal nanoparticles, can also be applied to dispersing other various materials, and has wide practical application.
Drawings
FIG. 1 is a schematic view of a simple ultrasonic mixer.
In the upper diagram, 1: a sample bottle; 2: a stainless steel container; 3: an ultrasonic frequency knob; 4: a stirring rate knob; 5: an ultrasonic transducer; 6: a magnetic stirring device.
FIG. 2 is an SEM image of the particle size distribution map and surface topography of example 2.
FIG. 3 is a graph showing the results of particle settling at different times in example 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the starting materials of the present invention are all common commercial products unless otherwise specified.
Example 1
The embodiment provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which comprises the following steps:
(1) As shown in fig. 1, a stainless steel rectangular container with a moderate size is taken, two ultrasonic transducers are firmly adhered to proper positions on the side of the stainless steel rectangular container by using strong glue, then a driving plate is correspondingly welded with contacts of the transducers, then an electric heating disc and a micro motor with magnetic steel are welded at the bottom of the stainless steel rectangular container, then a slide rheostat switch is respectively connected into a circuit of the stainless steel rectangular container to adjust the heating temperature and the stirring speed, finally a stainless steel shell is additionally arranged outside the whole device, the ultrasonic driving plate and the slide rheostat switch are fixed on the shell, and after the wires are simply arranged, the simple ultrasonic stirrer is manufactured by a self-made simple ultrasonic stirrer.
(2) 0.5g of gallium indium tin liquid metal (Ga) was sucked up by a syringe 67 In 20.5 Sn 12.5 ) Injecting into a sample bottle, adding 20ml of n-octadecanethiol ethanol solution with the concentration of 0.1mmol/L, adding a polytetrafluoroethylene magnetic stirrer with proper size, and screwing a sample bottle cap.
(3) Adding 2/3 of clear water into a container of a self-made ultrasonic stirrer, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, keeping the power at 100W, performing ultrasonic treatment for 1 hour, and stirring at the rotating speed of 200 rpm to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the embodiment is 412nm, the particle size distribution is 325-530nm, and the obtained liquid metal nanoparticles do not agglomerate after being placed for 48 hours at room temperature.
Other examples step (1) the simple ultrasonic stirrer was fabricated according to step (1) of example 1, and thus the description is given.
Example 2
The embodiment provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which comprises the following steps:
(1) The procedure was the same as in example 1;
(2) 0.5g of gallium indium tin liquid metal (Ga) was sucked up by a syringe 67 In 20.5 Sn 12.5 ) Injecting into a sample bottle, adding 20ml of n-octadecanethiol ethanol solution with the concentration of 1mmol/L, then putting a polytetrafluoroethylene magnetic stirrer with proper size, and screwing a sample bottle cap;
(3) Adding 2/3 of clear water into a container of a self-made ultrasonic stirrer, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, keeping the power at 100W, performing ultrasonic treatment for 8 hours, and stirring at the rotating speed of 800 rpm to obtain the liquid metal nanoparticles.
Fig. 2 and fig. 3 are a particle size distribution diagram, an SEM diagram of a surface morphology, and a result diagram of particle sedimentation at different times of the liquid metal nanoparticles prepared in this embodiment, respectively, where the average particle size of the liquid metal nanoparticles obtained in this embodiment is 162nm, the particle size distribution is 125-210nm, and the obtained liquid metal nanoparticles do not agglomerate after being placed at room temperature for 48 hours.
Example 3
The embodiment provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which comprises the following steps:
(1) The procedure was the same as in example 1;
(2) 0.5g of gallium indium tin liquid metal (Ga) was sucked up by a syringe 67 In 20.5 Sn 12.5 ) Injecting into a sample bottle, adding 20ml of n-octadecanethiol ethanol solution with the concentration of 5mmol/L, then putting a polytetrafluoroethylene magnetic stirrer with proper size, and screwing a sample bottle cap;
(3) Adding 2/3 of clear water into a container of a self-made ultrasonic stirrer, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, keeping the power at 100W, performing ultrasonic treatment for 4 hours, and stirring at the rotating speed of 400 rpm to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the embodiment is 184nm, the particle size distribution is 135-240nm, and the obtained liquid metal nanoparticles do not agglomerate after being placed for 48 hours at room temperature.
Example 4
The embodiment provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which comprises the following steps:
(1) The procedure was the same as in example 1;
(2) 0.5g of gallium indium liquid metal (Ga) was sucked up by a syringe 75 In 25 ) Injecting into a sample bottle, adding 20ml of 0.1mmol/L cetyl trimethyl ammonium bromide ethanol solution, adding a polytetrafluoroethylene magnetic stirrer with a proper size, and screwing a sample bottle cap;
(3) Adding 2/3 of clear water into a container of a self-made ultrasonic stirrer, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, keeping the power at 80W, performing ultrasonic treatment for 4 hours, and stirring at the rotating speed of 400 rpm to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the embodiment is 314nm, the particle size distribution is 256-367nm, and the obtained liquid metal nanoparticles can not be agglomerated after being placed for 48 hours at room temperature.
Example 5
The embodiment provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which comprises the following steps:
(1) The procedure was the same as in example 1;
(2) 0.5g of gallium indium liquid metal (Ga) was sucked up by a syringe 75 In 25 ) Injecting into a sample bottle, adding 20ml of 1mmol/L hexadecyl trimethyl ammonium bromide ethanol solution, adding a polytetrafluoroethylene magnetic stirrer with proper size, and screwing a sample bottle cap;
(3) Adding 2/3 of clean water into a container of a self-made ultrasonic stirrer, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, the power at 60W, carrying out ultrasonic treatment for 4 hours, and stirring at the rotating speed of 400 revolutions per minute to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the embodiment is 282nm, the particle size distribution is 236-514nm, and the obtained liquid metal nanoparticles do not agglomerate after being placed for 48 hours at room temperature.
Example 6
The embodiment provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which comprises the following steps:
(1) The procedure was the same as in example 1;
(2) 0.5g of gallium indium liquid metal (Ga) was sucked up by a syringe 75 In 25 ) Injecting into a sample bottle, adding 35ml of 1mmol/L hexadecyl trimethyl ammonium bromide ethanol solution, adding a polytetrafluoroethylene magnetic stirrer with proper size, and screwing a sample bottle cap;
(3) Adding 2/3 of clear water into a container of a self-made ultrasonic stirrer, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, keeping the power at 60W, performing ultrasonic treatment for 4 hours, and stirring at the rotating speed of 400 rpm to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the embodiment is 293nm, the particle size distribution is 223-524nm, and the obtained liquid metal nanoparticles do not agglomerate after being placed for 48 hours at room temperature.
Example 7
The present example is different from example 6 in that the liquid metal nanoparticles can be obtained by maintaining the water temperature in step (2) of example 6 at 40 ℃, the ultrasonic time at 8 hours, and the stirring speed at 800 rpm.
The average particle size of the liquid metal nanoparticles obtained in the embodiment is 153nm, the particle size distribution is 114-212nm, and the obtained liquid metal nanoparticles can not be agglomerated after being placed for 48 hours at room temperature.
Comparative example 1
In this comparative example, a commercially available ultrasonic apparatus (KQ-100E) was used instead of the home-made ultrasonic stirrer of the present invention.
(1) 0.5g of gallium indium tin liquid metal (Ga) was sucked up by a syringe 67 In 20.5 Sn 12.5 ) Injecting the mixture into a sample bottle, adding 20ml of n-octadecanethiol ethanol solution with the concentration of 1mmol/L, and screwing down the bottle cap of the sample;
(2) Adding 2/3 of clear water into a container of an ultrasonic instrument, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, keeping the power at 100W, and carrying out ultrasonic treatment for 4 hours to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the comparative example is 650nm, the particle size distribution is 600-700nm, and the obtained liquid metal nanoparticles are placed at room temperature for 6 hours to generate an agglomeration phenomenon.
Comparative example 2
This comparative example was prepared without using the home-made ultrasonic agitator of the present invention, using a commercially available ordinary ultrasonic apparatus (KQ-100E), and a mechanical agitator.
(1) 0.5g of gallium indium tin liquid metal (Ga) was sucked up by a syringe 67 In 20.5 Sn 12.5 ) Injecting into a sample bottle, then adding 20ml of n-octadecanethiol ethanol solution with the concentration of 1mmol/L, and placing the sample bottle open;
(2) Adding 2/3 of clear water into a container of an ultrasonic instrument, then placing the sample bottle in the previous step into the center of the container, putting a stirring rod of a mechanical stirrer into the sample bottle, keeping the water temperature at 25 ℃, keeping the power at 100W, carrying out ultrasonic treatment for 4 hours, and stirring at the rotating speed of 400 r/min to obtain the liquid metal nano-particles.
The average particle size of the liquid metal nanoparticles obtained in the comparative example is 550nm, the particle size distribution is 500-600nm, and the obtained liquid metal nanoparticles are placed at room temperature for 12h to generate an agglomeration phenomenon.
Comparative example 3
This comparative example was prepared without using the home-made ultrasonic agitator of the present invention, using a commercially available ordinary ultrasonic apparatus (KQ-100E), and a magnetic agitator.
(1) 0.5g of gallium indium tin liquid metal (Ga) was sucked up by a syringe 67 In 20.5 Sn 12.5 ) Injecting into a sample bottle, adding 20ml of n-octadecanethiol ethanol solution with the concentration of 1mmol/L, then putting into a polytetrafluoroethylene magnetic stirrer with proper size, screwing a sample bottle cap, and stirring for 1 hour on the magnetic stirrer;
(2) Adding 2/3 of clean water into a container of an ultrasonic instrument, then placing the sample bottle in the previous step into the center of the container, keeping the water temperature at 25 ℃, and performing ultrasonic treatment at 100W for 4 hours to obtain the liquid metal nanoparticles.
The average particle size of the liquid metal nanoparticles obtained in the comparative example is 450nm, the particle size distribution is 400-500nm, and the liquid metal nanoparticles are placed at room temperature for 12 hours to generate an agglomeration phenomenon.
In summary, the invention provides a method for preparing liquid metal nanoparticles by an ultrasonic stirring method, which utilizes a self-made simple ultrasonic stirrer to simultaneously carry out ultrasonic oscillation and stirring shearing on liquid metal, and can effectively disperse the liquid metal into liquid drops with the particle size of tens to hundreds of nanometers within a certain time under the coordination of an ethanol/surfactant dispersion system; the method relates to ultrasonic stirring equipment, is low in cost and practical, can be used for dispersing liquid metal nanoparticles, can also be applied to dispersing and preparing other various materials, and has wide practical application.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A method for preparing liquid metal nanoparticles by an ultrasonic stirring method comprises the following steps:
(1) A self-made simple ultrasonic stirrer;
(2) Providing a room temperature liquid metal and an ethanol/surfactant dispersion;
(3) Adding the liquid metal into an ethanol/surfactant system, putting a magnetic stirrer, starting an ultrasonic stirrer, and obtaining liquid metal nanoparticles after a certain time;
the simple ultrasonic stirrer comprises a stainless steel container, an electric heating wire, magnetic steel driven by a micro motor and an ultrasonic transducer.
2. The method of claim 1, wherein the stainless steel container bottom of the simple ultrasonic mixer is equipped with a heating wire and a micro-motor driven magnetic steel, wherein the heating wire provides a heating function, and the micro-motor driven magnetic steel provides a stirring function; preferably, the heating wire and the micro motor are respectively equipped with a slide rheostat; particularly preferably, the heating wire and the micro motor are equipped with a temperature sensor and a rotation speed sensor, respectively.
3. The method according to claim 1 or 2, wherein the stainless steel container side of the simple ultrasonic mixer is equipped with an ultrasonic transducer, and the ultrasonic transducer provides an ultrasonic vibration function; preferably, the number of the ultrasonic transducers to be mounted is two or more; it is particularly preferred that all ultrasonic transducers are mounted on the same side of the stainless steel vessel with the centres of the transducers on the same horizontal line.
4. The method according to claim 3, wherein the room temperature liquid metal is one or more of metal gallium, gallium indium alloy and gallium indium tin alloy.
5. The method according to claim 3, wherein the ethanol/surfactant dispersion has a surfactant concentration in ethanol of 0.1 to 15mmol/L; preferably 0.5-2 mmol/L; most preferably 1mmol/L.
6. The method according to claim 3, wherein the ethanol/surfactant dispersion system comprises one or more of a thiol surfactant, an amine surfactant and a carboxyl surfactant.
7. The method according to claim 6, wherein the thiol-based surfactant is n-octadecanethiol, lauryl mercaptan or n-octyl mercaptan; the amine surfactant is n-octylamine; the carboxyl surfactant is stearic acid.
8. The method according to claim 3, wherein the mass to volume ratio of the liquid metal to the ethanol/surfactant dispersion is from 1; preferably 1; most preferably 1.
9. The method according to claim 3, wherein the ultrasonic power is 10-500W, preferably 60-100W; the ultrasonic stirring time is 1 to 12 hours, preferably 4 to 5 hours.
10. The method as claimed in claim 3, wherein the water level of the clean water poured into the stainless steel container of the ultrasonic stirrer is higher than the upper edge of the ultrasonic transducer at the side part, and the water temperature in the container is kept between 10 and 45 ℃; the stirring speed is 100-1000 r/min; preferably 400 to 800 revolutions per minute.
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| CN108480650A (en) * | 2018-05-30 | 2018-09-04 | 深圳大学 | A kind of liquid metal nano particle and preparation method thereof |
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