CN111073611A - MXene/graphene composite heat-conducting fluid and preparation method and application thereof - Google Patents
MXene/graphene composite heat-conducting fluid and preparation method and application thereof Download PDFInfo
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- CN111073611A CN111073611A CN201911292434.2A CN201911292434A CN111073611A CN 111073611 A CN111073611 A CN 111073611A CN 201911292434 A CN201911292434 A CN 201911292434A CN 111073611 A CN111073611 A CN 111073611A
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Abstract
The invention discloses an MXene/graphene composite heat-conducting fluid and a preparation method and application thereof, wherein the heat-conducting fluid consists of 0.01-1% of MXene/graphene, 0.01-1% of a dispersing agent and 98-99.8% of water, and the mass ratio of MXene to graphene in an MXene/graphene material is 0.1: 1-1: 1. The preparation method of the heat-conducting fluid comprises the following steps: (1) adding MXene, graphene and a dispersing agent into water, and uniformly stirring; (2) and performing ultrasonic dispersion on the uniformly mixed raw materials to obtain the MXene/graphene heat-conducting fluid. The heat-conducting fluid is used as a heat-conducting medium for temperature control and crack prevention of mass concrete. The heat conductivity coefficient of the heat-conducting fluid is as high as 0.754W/m.K, and is increased by 25.9% compared with water.
Description
Technical Field
The invention relates to a heat-conducting fluid, a preparation method and application thereof, and in particular relates to an MXene/graphene composite heat-conducting fluid, a preparation method and application thereof.
Background
The large-volume concrete generates more heat due to cement hydration in the construction period, so that the internal temperature of the concrete is sharply increased, the heat conductivity coefficient of the concrete is lower, the internal and external temperature difference of the concrete structure is larger, the internal and external temperature difference of the concrete is limited due to the constraint condition of the internal and external structures of the concrete, the temperature difference can cause the internal tensile stress of the concrete, when the tensile stress exceeds the tensile strength of the concrete, the concrete structure generates more temperature cracks, and the bearing capacity, the water resistance, the service life and the like of the concrete structure are greatly influenced, so that the large-volume concrete needs to adopt temperature control anti-cracking measures in the construction process. At present bulky concrete control by temperature change crack control measure is through reducing adiabatic temperature rise, reduces the difference in temperature to the production of control temperature crack, main measure is for arranging condenser tube in the concrete, and the heat transfer medium who uses in the traditional concrete condenser tube is water, but the coefficient of heat conductivity of water is lower, and heat transfer efficiency is lower when making water as the coolant liquid, has influenced control by temperature change crack control efficiency.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide MXene/graphene composite heat-conducting fluid with good heat-conducting property; another object of the present invention is to provide a method for preparing the heat transfer fluid; the invention also aims to provide application of the heat-conducting fluid as a heat-conducting medium in the temperature control and crack prevention of mass concrete.
The technical scheme is as follows: the MXene/graphene composite heat-conducting fluid is composed of 0.01-1% of MXene/graphene, 0.01-1% of a dispersing agent and 98-99.8% of water, wherein the mass ratio of MXene to graphene in the MXene/graphene material is 0.1: 1-1: 1.
The MXene/graphene composite heat-conducting fluid is composed of 0.5% -1% of MXene/graphene, 0.5% -1% of dispersing agent and 98% -99% of water, wherein the mass ratio of MXene to graphene in the MXene/graphene material is 0.5: 1-1: 1.
Wherein MXene material is Ti3C2Tx、Ti2CTx、V2CTx、Nb2One of CTx, Tx is-OH functional group, or-F functional group; the dispersant is sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, and hexadecylAt least one of trimethyl ammonium bromide.
The preparation method of the MXene/graphene composite heat-conducting fluid comprises the following steps:
(1) adding MXene, graphene and a dispersing agent into water, and uniformly stirring;
(2) and performing ultrasonic dispersion on the uniformly mixed raw materials to obtain the MXene/graphene heat-conducting fluid.
Wherein, MXene, graphene, a dispersing agent and water are stirred by a magnetic stirrer at the speed of 400-600rpm for 30-60 min in the step 1, and the water is deionized water; the ultrasonic dispersion time in the step 2 is 30-60 min.
The MXene/graphene composite heat-conducting fluid is applied as a heat-conducting medium in the concrete solidification process.
The working principle is as follows: the terminating groups (-F, ═ O, and-OH) on the surface of MXene provide hydrophilicity, so MXene can be dispersed in water relatively easily. MXene and graphene have similar structures, and when MXene and graphene are mixed, MXene particles can enter between graphene sheet layers, so that the agglomeration effect between graphene sheet layers is overcome, and the MXene material can enable graphene in a super heat conduction material to be easily dispersed in water, and the heat conductivity coefficient of water can be greatly improved. The use of the dispersant can enable MXene/graphene to be well and uniformly dispersed in water and to be stably present for a long time.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: 1. the heat conductivity coefficient of the heat-conducting fluid is as high as 0.754W/m.K, and the heat conductivity coefficient is increased by 25.9 percent compared with water; 2. the heat-conducting fluid has good dispersibility and good pumpability, and therefore, can be used as a heat-conducting medium in the temperature control and crack prevention of mass concrete.
Detailed Description
Example 1
Mixing 0.1667g Ti3C2Tx, 0.3333g of graphene and 0.5g of sodium dodecyl benzene sulfonate are added into 49g of water, stirred at the stirring speed of 600rpm for 30min and uniformly mixed, and then subjected to ultrasonic dispersion for 60min to obtain uniformly dispersed and stable MXene/graphene heat-conducting fluid. TheIn the MXene heat-conducting fluid, the content of MXene/graphene is 1%, and the content of MXene: graphene is 0.5:1, sodium dodecyl benzene sulfonate is 1%, and water is 98%. And introducing MXene/graphene heat-conducting fluid serving as a heat-conducting medium into a cooling water pipe in the concrete for heat dissipation.
Example 2
Mixing 0.1667g Ti3C2Tx, 0.3333g of graphene and 0.5g of hexadecyl trimethyl ammonium bromide are added into 49g of water, stirred at the stirring speed of 600rpm for 30min and uniformly mixed, and then subjected to ultrasonic dispersion for 60min to obtain the uniformly dispersed and stable MXene/graphene heat-conducting fluid. In the MXene heat-conducting fluid, the content of MXene/graphene is 1%, and the content of MXene: graphene 0.5:1, cetyltrimethylammonium bromide 1%, water 98%. And introducing MXene/graphene heat-conducting fluid serving as a heat-conducting medium into a cooling water pipe in the concrete for heat dissipation.
Example 3
0.25g of Ti3C2Tx, 0.25g of graphene and 0.5g of sodium dodecyl benzene sulfonate are added into 49g of water, stirred at the stirring speed of 600rpm for 30min and uniformly mixed, and then subjected to ultrasonic dispersion for 60min to obtain uniformly dispersed and stable MXene/graphene heat-conducting fluid. In the MXene heat-conducting fluid, the content of MXene/graphene is 1%, and the content of MXene: graphene 1:1, sodium dodecyl benzene sulfonate 1%, water 98%. And introducing MXene/graphene heat-conducting fluid serving as a heat-conducting medium into a cooling water pipe in the concrete for heat dissipation.
Comparative example
0.1667g of Ti3C2Tx and 0.3333g of graphene are added into 49.5g of water, stirred at a stirring speed of 600rpm for 30min and uniformly mixed, and then ultrasonically dispersed for 60min to obtain the MXene/graphene heat-conducting fluid which is uniformly and stably dispersed. In the MXene heat-conducting fluid, the content of MXene/graphene is 1%, and the content of MXene: graphene 0.5:1, water 99%.
As can be seen from table 1, after standing for 2 hours, the MXene/graphene heat-conducting fluid without the dispersant has a delamination phenomenon, and the MXene/graphene heat-conducting fluid has good dispersibility after the sodium dodecylbenzene sulfonate and the hexadecyl trimethyl ammonium bromide are added. After 120 hours, the MXene/graphene heat-conducting fluid doped with sodium dodecyl benzene sulfonate and hexadecyl trimethyl ammonium bromide can still keep better dispersibility. Therefore, after the dispersing agent is doped, MXene particles are uniformly dispersed in the MXene/graphene heat-conducting fluid, the viscosity of the heat-conducting fluid is low, the fluidity is good, and the pumpability is good, so that the MXene/graphene heat-conducting fluid can be well applied to temperature control and crack prevention of mass concrete.
As can be seen from table 2, MXene/graphene can effectively improve the thermal conductivity of the thermal conductive fluid, and the thermal conductivity of the thermal conductive fluid gradually increases with the increase of the amount of doped graphene. When sodium dodecyl benzene sulfonate is used as a dispersing agent, the mixing amount of MXene/graphene is 1%, wherein the mass ratio of MXene to graphene is 0.5:1 and 1:1, the thermal conductivity coefficients of the MXene/graphene are 0.731W/(m.K) and 0.754W/(m.K), and the thermal conductivity coefficients of the MXene/graphene are increased by 22.0% and 25.9% respectively compared with the thermal conductivity coefficient of pure water of 0.599W/(m.K). Therefore, the heat conductivity coefficient of the heat-conducting fluid can be obviously increased by doping MXene/graphene, and the heat conductivity coefficient of the heat-conducting fluid is further increased along with the increase of the doping amount of the graphene, so that the heat transfer efficiency of the mass concrete can be effectively improved by the MXene heat-conducting fluid.
TABLE 1 Dispersion Effect of MXene/graphene Heat-conducting fluid
TABLE 2 MXene/graphene Heat transfer Properties of Heat transfer fluids
| Composition (I) | Coefficient of thermal conductivity (W/m. K) | Rate of increase |
| Pure water | 0.599 | --- |
| Example 1 | 0.731 | 22.0％ |
| Example 2 | 0.734 | 22.5％ |
| Example 3 | 0.754 | 25.9％ |
Claims (9)
1. The MXene/graphene composite heat-conducting fluid is characterized by consisting of 0.01-1% of MXene/graphene, 0.01-1% of dispersing agent and 98-99.8% of water, wherein the mass ratio of MXene to graphene is 0.1: 1-1: 1.
2. The MXene/graphene composite heat-conducting fluid as claimed in claim 1, wherein the MXene/graphene composite heat-conducting fluid is composed of 0.5-1% of MXene/graphene, 0.5-1% of dispersant and 98-99% of water, and the mass ratio of MXene to graphene in the MXene/graphene material is 0.5: 1-1: 1.
3. The MXene/graphene composite heat-conducting fluid as claimed in claim 1, wherein the MXene material is Ti3C2Tx、Ti2CTx、V2CTx、Nb2CTx, wherein Tx is at least one of-OH functional group and-F functional group.
4. The MXene/graphene composite thermal conductive fluid of claim 1, wherein the dispersant is at least one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, cetyl trimethyl ammonium bromide.
5. The preparation method of the MXene/graphene composite heat-conducting fluid as claimed in claim 1, characterized by comprising the following steps:
(1) adding MXene, graphene and a dispersing agent into water according to a proportion and uniformly stirring;
(2) and performing ultrasonic dispersion on the uniformly mixed raw materials to obtain the MXene/graphene heat-conducting fluid.
6. The method for preparing MXene/graphene composite heat-conducting fluid according to claim 5, wherein MXene, graphene, dispersant and water are stirred by a magnetic stirrer at a speed of 400-600rpm for 30-60 min in the step 1.
7. The preparation method of MXene/graphene composite heat-conducting fluid according to claim 5, wherein the ultrasonic dispersion time in step 2 is 30-60 min.
8. The method for preparing MXene/graphene composite heat-conducting fluid according to claim 5, wherein the water in step 1 is deionized water.
9. The application of the MXene/graphene composite heat-conducting fluid disclosed by claim 1 as a heat-conducting medium in a condensation pipe in large-volume concrete temperature control crack prevention.
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| US20120251521A1 (en) * | 2011-04-02 | 2012-10-04 | Bertha Rostro | Technical field and industrial applicability of the invention |
| CN102942906A (en) * | 2012-11-28 | 2013-02-27 | 上海第二工业大学 | High thermal conductivity and low viscosity water base composite heat conductivity filler nanofluid and preparation method thereof |
| US20140312263A1 (en) * | 2013-04-22 | 2014-10-23 | Uchicago Argonne, Llc | Advanced thermal properties of a suspension with graphene nano-platelets (gnps) and custom functionalized f-gnps |
| CN105860937A (en) * | 2016-05-10 | 2016-08-17 | 高邮久创信息科技有限公司 | Nano-fluid superconduction liquid for heat pipe type vacuum collector tube and preparation method of nano-fluid superconduction liquid |
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