CN115260993B - MXene stable ionic liquid-based phase-change emulsion and preparation method thereof - Google Patents
MXene stable ionic liquid-based phase-change emulsion and preparation method thereof Download PDFInfo
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- 239000002608 ionic liquid Substances 0.000 title claims abstract description 82
- 239000000839 emulsion Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000004945 emulsification Methods 0.000 title description 4
- 239000012782 phase change material Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000004781 supercooling Methods 0.000 claims abstract description 9
- 230000001804 emulsifying effect Effects 0.000 claims abstract description 5
- 235000021355 Stearic acid Nutrition 0.000 claims description 65
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 65
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 65
- 239000008117 stearic acid Substances 0.000 claims description 65
- 230000008018 melting Effects 0.000 claims description 35
- 238000002844 melting Methods 0.000 claims description 35
- 230000008859 change Effects 0.000 claims description 15
- IQQRAVYLUAZUGX-UHFFFAOYSA-N 1-butyl-3-methylimidazolium Chemical compound CCCCN1C=C[N+](C)=C1 IQQRAVYLUAZUGX-UHFFFAOYSA-N 0.000 claims description 13
- -1 1-butyl-3-methylimidazolium tetrafluoroborate Chemical compound 0.000 claims description 8
- RVEJOWGVUQQIIZ-UHFFFAOYSA-N 1-hexyl-3-methylimidazolium Chemical compound CCCCCCN1C=C[N+](C)=C1 RVEJOWGVUQQIIZ-UHFFFAOYSA-N 0.000 claims description 4
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- NJMWOUFKYKNWDW-UHFFFAOYSA-N 1-ethyl-3-methylimidazolium Chemical compound CCN1C=C[N+](C)=C1 NJMWOUFKYKNWDW-UHFFFAOYSA-N 0.000 claims description 2
- 229910019762 Nb4C3 Inorganic materials 0.000 claims description 2
- INDFXCHYORWHLQ-UHFFFAOYSA-N bis(trifluoromethylsulfonyl)azanide;1-butyl-3-methylimidazol-3-ium Chemical class CCCCN1C=C[N+](C)=C1.FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F INDFXCHYORWHLQ-UHFFFAOYSA-N 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 150000004665 fatty acids Chemical class 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 17
- 239000003995 emulsifying agent Substances 0.000 abstract description 7
- 239000013529 heat transfer fluid Substances 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract description 2
- 239000002667 nucleating agent Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 27
- 239000002245 particle Substances 0.000 description 11
- 238000009210 therapy by ultrasound Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- YNCRBFODOPHHAO-YUELXQCFSA-N Phaseic acid Natural products CC(=CC(=O)O)C=C[C@@H]1[C@@]2(C)CO[C@@]1(C)CC(=O)C2 YNCRBFODOPHHAO-YUELXQCFSA-N 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 238000000089 atomic force micrograph Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- IZGYIFFQBZWOLJ-UHFFFAOYSA-N neophaseic acid Natural products C1C(=O)CC2(C)OCC1(C)C2(O)C=CC(C)=CC(O)=O IZGYIFFQBZWOLJ-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- IZGYIFFQBZWOLJ-CKAACLRMSA-N phaseic acid Chemical compound C1C(=O)C[C@@]2(C)OC[C@]1(C)[C@@]2(O)C=CC(/C)=C\C(O)=O IZGYIFFQBZWOLJ-CKAACLRMSA-N 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention relates to an ionic liquid-based phase-change emulsion with stable MXene and a preparation method thereof, belonging to the field of new materials. The preparation method of the MXene stable ionic liquid-based phase-change emulsion comprises the steps of adding 3-30% of phase-change material and 0.01-0.5% of two-dimensional layered material MXene into the balance of ionic liquid according to mass percentage, heating until the phase-change material is completely melted, and then emulsifying to obtain the MXene stable ionic liquid-based phase-change emulsion. The invention adopts MXene as an emulsifying agent and a nucleating agent, and self-assembles at the two-phase interface of the ionic liquid and the phase-change material, thereby achieving the dual purposes of improving the stability of the ionic liquid-based phase-change emulsion and reducing the supercooling degree of the ionic liquid-based phase-change emulsion; the ionic liquid-based phase-change emulsion has the advantages of constant phase-change temperature, large phase-change latent heat and the like in the phase-change process of the phase-change material, and the specific heat capacity of the heat transfer fluid is remarkably improved; the ionic liquid has wide liquid temperature range and good thermal stability, and widens the working temperature range of the ionic liquid-based phase-change emulsion.
Description
Technical Field
The invention relates to an ionic liquid-based phase-change emulsion with stable MXene and a preparation method thereof, belonging to the field of new materials.
Background
The latent heat type functional thermal fluid obtained by introducing the phase change material into the heat transfer fluid can utilize the phase change material to store or release a large amount of heat when the phase change material changes phase to improve the apparent specific heat capacity and the energy storage density of the heat transfer fluid, thereby realizing the enhanced heat transfer. Latent heat functional hot fluids are generally classified into ice slurries, hydrate slurries, phase-change microcapsule slurries, and phase-change emulsions. The phase-change emulsion has the advantages of high energy storage density, simple preparation method, low cost, negligible thermal resistance of the emulsifier protection layer and the like, and the phase-change emulsion is used as a novel heat collecting fluid to help to improve the heat transfer performance and the heat storage performance of the heat collecting fluid. The phase-change emulsion is a thermodynamically unstable system, liquid drops have the tendency of automatic coalescence, and the phase-change emulsion has larger supercooling degree under the condition of limiting the domain, so that the heat storage capacity of the phase-change emulsion in the working temperature range is reduced. In addition, the reported phase-change emulsions all use water as a continuous phase, limiting their application in medium and high temperature fields. Therefore, the preparation of the phase-change emulsion with good stability, low supercooling degree, high specific heat capacity and high temperature resistance still faces great challenges.
MXene is a novel two-dimensional transition metal carbide, nitride or carbonitride, the surface of the MXene contains rich functional groups (-OH, -O, -F and the like), and the MXene has good hydrophilicity, thermal conductivity, light absorptivity and emulsifier characteristics and has attracted extensive attention of researchers in recent years. The interfacial tension of the MXene is reduced by interfacial modification of the MXene with a cationic emulsifier or cationic polymer, and the resulting modified MXene can self-assemble directionally at the oil-water interface to form a stable oil-in-water Pickering emulsion [1,2]. Although MXene has been studied as a solid emulsifier for preparing oil-in-water Pickering emulsions, the construction of high performance ionic liquid-based phase change emulsions with ionic liquids as the continuous phase that have a wide range of liquid temperatures and good thermal stability still faces many challenges.
Reference to the literature
[1]BIAN R,LIN R,WANG G,et al.3D assembly of Ti3C2-MXene directed by water/oil interfaces[J].Nanoscale,2018,10(8):3621-5.
[2]Self-Assembly of MXene-Surfactants at Liquid–Liquid Interfaces:From Structured Liquids to 3D Aerogels[J].Angewandte Chemie International Edition,2019,58(50):18171-6.
Disclosure of Invention
Aiming at one or more problems of the technology, the invention aims to provide an ionic liquid-based phase-change emulsion with stable two-dimensional lamellar material MXene and a preparation method thereof. The invention takes MXene as a solid emulsifier, ionic liquid as a continuous phase and stearic acid phase-change material as a disperse phase, and prepares the two-dimensional layered material MXene stable ionic liquid-based phase-change emulsion which has good stability, low supercooling degree, large specific heat capacity and high temperature resistance through design.
The preparation method of the MXene stable ionic liquid-based phase-change emulsion comprises the following steps: according to the mass percentage, 3-30% of phase-change material and 0.01-0.5% of two-dimensional layered material MXene are added into the balance of ionic liquid, heated until the phase-change material is completely melted, and then emulsified, thus obtaining the ionic liquid-based phase-change emulsion with stable MXene.
In the technical scheme, the sum of the mass percentages of the phase change material, the two-dimensional layered material MXene and the ionic liquid is 100%.
Preferably, 10-20% of the phase change material and 0.05% of the two-dimensional layered material MXene are added to the balance of the ionic liquid.
In the above technical solution, the heating is preferably performed by using an oil bath.
In the above-described embodiments, the emulsification is preferably performed in a cell pulverizer.
Further, 100-800W ultrasonic power is used for emulsification for 3-20 min, and thus the ionic liquid-based phase-change emulsion with stable MXene is obtained.
Further preferably, the ultrasonic power is 300-600W, and the emulsifying time is 5-15 min.
In the above technical scheme, preferably, the phase change material is fatty acid or aliphatic hydrocarbon with a phase change melting temperature of 50-90 ℃ and a phase change latent heat of 150-260J/g.
Further, the phase change material is preferably stearic acid having a phase change melting temperature of 70 ℃.
Further, the phase change material is preferably an aliphatic hydrocarbon having a phase change melting temperature of 50 to 90 ℃.
Most preferably, the phase change material is RT82 produced by RUBITHERM or paraffin wax with a melting point of 62 ℃.
In the above technical solution, preferably, the two-dimensional layered material MXene is one of Ti 3C2、Ti2C、Mo3C2、Nb4C3、Nb2 C.
In the above technical scheme, preferably the ionic liquid is one of 1-butyl-3-methylimidazolium tetrafluoroborate [ BMIM ] BF 4, 1-ethyl-3-methylimidazolium tetrafluoroborate [ EMim ] [ BF 4 ], 1-hexyl-3-methylimidazolium tetrafluoroborate [ HMIm ] [ BF 4 ], 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide salt [ HMIm ] [ NTf 2 ] or N-butylpyridine tetrafluoroborate [ BPy ] [ BF 4 ].
It is another object of the present invention to provide an MXene stabilized ionic liquid based phase change emulsion made by the above method.
The working temperature of the MXene stable ionic liquid-based phase-change emulsion is-70-300 ℃, the latent heat of phase change is 5-70J/g, the melting temperature is 60-90 ℃, the solidification temperature is 50-90 ℃, and the supercooling degree is less than 4 ℃.
The beneficial effects of the invention are as follows: the invention adopts a novel two-dimensional layered material MXene as an emulsifying agent and a nucleating agent, and self-assembles at the two-phase interface of the ionic liquid and the phase-change material, thereby achieving the dual purposes of improving the stability of the ionic liquid-based phase-change emulsion and reducing the supercooling degree of the ionic liquid-based phase-change emulsion; the ionic liquid-based phase-change emulsion has the advantages of constant phase-change temperature, large phase-change latent heat and the like in the phase-change process of the phase-change material, and the specific heat capacity of the heat transfer fluid is remarkably improved; the ionic liquid has wide liquid temperature range and good thermal stability, and widens the working temperature range of the ionic liquid-based phase-change emulsion; the preparation process is simple and the cost is low.
Drawings
FIG. 1 is an atomic force microscope image of a 20wt% stearic acid/ionic liquid phase-change emulsion prepared according to example 1 of the present invention.
FIG. 2 is a schematic representation of the droplet size distribution of a 15wt% stearic acid/ionic liquid phase-change emulsion prepared in example 2 of the present invention, with an average droplet size of 507.0nm. The inset is a sample real-time plot: a is a freshly prepared sample, and B is a sample after standing at room temperature for 7 days. The samples did not delaminate significantly, indicating good dispersion stability.
FIG. 3 is a DSC curve of a 15wt% stearic acid/ionic liquid phase change emulsion prepared in example 2 of the present invention. Wherein the mass fraction of stearic acid is 15wt%, and the phase change melting enthalpy is 23.3J/g; the melting temperature was 69.6 ℃, the solidification temperature was 67.3 ℃, and the supercooling degree was small (69.6-67.3=2.3 ℃).
FIG. 4 is a graph of apparent specific heat capacity for a 15wt% stearic acid/ionic liquid phase change emulsion and ionic liquid prepared in example 2 of the present invention. Wherein, the highest apparent specific heat capacity of 15wt% of stearic acid/ionic liquid phase-change emulsion is 6.36J/(g.K), which is 4.24 times of the highest apparent specific heat capacity of the ionic liquid.
Detailed Description
The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.
The test methods described in the following examples, unless otherwise specified, are all conventional; the reagents and materials, unless otherwise specified, are commercially available.
Example 1
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 20wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 5min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 20wt%, wherein the melting enthalpy is 31.4J/g, and the average particle size of liquid drops is 529.1nm.
Example 2
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fraction of Ti 3C2 and the mass fraction of stearic acid are respectively 0.05wt% and 15wt%, and the balance is ionic liquid, heating the mixture at 90 ℃ until the stearic acid is completely melted, carrying out ultrasonic treatment for 10min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the average particle size of liquid drops is 507.0nm, and a sample is not obviously layered after standing for 7 days, so that the phase-change emulsion has good dispersion stability; 15wt% of stearic acid/ionic liquid phase-change emulsion has a melting temperature of 69.6 ℃, a solidification temperature of 67.3 ℃ and a small supercooling degree (69.6-67.3=2.3 ℃); the melting enthalpy is 23.3J/g, and the highest apparent specific heat capacity is 6.36J/(g.K) which is 4.24 times of the highest apparent specific heat capacity of the ionic liquid.
Example 3
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.03wt% and 15wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 10min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 17.5J/g, and the average particle size of liquid drops is 711.2nm.
Example 4
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.07wt% and 15wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 10min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 21.9J/g, and the average particle size of liquid drops is 482.3nm.
Example 5
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 15wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 10min by using a cell pulverizer under the ultrasonic power of 300W to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 22.0J/g, and the average particle size of liquid drops is 580.2nm.
Example 6
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 15wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 5min by using a cell pulverizer at 500W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 22.4J/g, and the average particle size of liquid drops is 493.8nm.
Example 7
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 15wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 5min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 20.9J/g, and the average particle size of liquid drops is 532.1nm.
Example 8
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 15wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 15min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 22.7J/g, and the average particle size of liquid drops is 487.7nm.
Example 9
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 15wt%, and the balance is ionic liquid, heating at 85 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 5min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 15wt%, wherein the melting enthalpy is 22.3J/g, and the average particle size of liquid drops is 498.5nm.
Example 10
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 5wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 5min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 5wt%, wherein the melting enthalpy is 7.3J/g, and the average particle size of liquid drops is 433.0nm.
Example 11
Adding Ti 3C2 phase MXene and stearic acid with the melting temperature of 70.0 ℃ into [ BMIM ] BF 4 ionic liquid, wherein the mass fractions of Ti 3C2 and stearic acid are respectively 0.05wt% and 10wt%, and the balance is ionic liquid, heating at 90 ℃ until the stearic acid is completely melted, and carrying out ultrasonic treatment for 5min by using a cell pulverizer at 400W ultrasonic power to prepare stearic acid/ionic liquid phase-change emulsion with the stearic acid content of 10wt%, wherein the melting enthalpy is 13.2J/g, and the average particle size of liquid drops is 449.4nm.
The foregoing examples, which are only helpful in understanding the method and core principles of the present invention, illustrate the products and methods of the present invention and are provided herein to illustrate the general steps and embodiments of the present invention. In view of the foregoing, it will be appreciated by those skilled in the art that in light of the overall principles of the invention, various conditions and parameters may be varied as desired in practice and, therefore, this description should not be construed to limit the invention.
Claims (9)
1. A preparation method of MXene stable ionic liquid-based phase-change emulsion is characterized in that,
Adding 3-30% of phase-change material and 0.01-0.07% of two-dimensional layered material MXene into the balance of ionic liquid according to mass percentage, heating until the phase-change material is completely melted, then emulsifying to obtain the ionic liquid-based phase-change emulsion with stable MXene,
Wherein the ionic liquid is one of 1-butyl-3-methylimidazolium tetrafluoroborate [ BMIM ] BF 4, 1-ethyl-3-methylimidazolium tetrafluoroborate [ EMim ] [ BF 4 ], 1-hexyl-3-methylimidazolium tetrafluoroborate [ HMIm ] [ BF 4 ], 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide salt [ HMIm ] [ NTf 2 ] or N-butylpyridine tetrafluoroborate [ BPy ] [ BF 4 ].
2. The method according to claim 1, wherein the phase change material is a fatty acid or an aliphatic hydrocarbon having a phase change melting temperature of 50 to 90 ℃ and a latent heat of phase change of 150 to 260J/g.
3. The method of claim 2, wherein the phase change material is stearic acid having a phase change melting temperature of 70 ℃.
4. The method of claim 2, wherein the phase change material is an aliphatic hydrocarbon having a phase change melting temperature of 50-90 ℃.
5. The method of claim 1, wherein the phase change material is RT82 produced by RUBITHERM or paraffin wax having a melting point of 62 ℃.
6. The method of claim 1, wherein the two-dimensional layered material MXene is one of Ti 3C2、Ti2C、Mo3C2、Nb4C3、Nb2 C.
7. The method of claim 1, wherein the MXene-stabilized ionic liquid-based phase-change emulsion is obtained by emulsifying for 3-20 min with 100-800W ultrasonic power.
8. The method of claim 7, wherein the ultrasonic power is 300-600W and the emulsifying time is 5-15 min.
9. The MXene stabilized ionic liquid based phase-change emulsion prepared by the method of any one of claims 1 to 8, characterized in that the MXene stabilized ionic liquid based phase-change emulsion has a working temperature of-70 to 300 ℃, a latent heat of phase change of 5 to 70J/g, a melting temperature of 60 to 90 ℃, a solidification temperature of 50 to 90 ℃ and a supercooling degree of less than 4 ℃.
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Patent Citations (4)
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| CN105622959A (en) * | 2016-01-22 | 2016-06-01 | 东莞市天尚太阳能有限公司 | Paraffin phase-change emulsion and preparation process thereof |
| CN105944581A (en) * | 2016-05-16 | 2016-09-21 | 辽宁大学 | Anion responsive Pickering emulsion as well as preparation method and application thereof |
| CN113214795A (en) * | 2021-01-21 | 2021-08-06 | 中国科学院过程工程研究所 | Preparation method of ionic liquid phase-change microcapsule |
| CN113462364A (en) * | 2021-07-01 | 2021-10-01 | 东莞理工学院 | Two-dimensional material MXene stable water-based phase-change emulsion and preparation method thereof |
Non-Patent Citations (1)
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| LCST型温敏性离子液体参与构筑的（类）微乳液体系的结构及性质研究;王瑞;万方学位论文;第1-68页 * |
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