CN113731208B - Method for regulating and controlling rapid emulsion breaking and re-stabilizing of emulsion without using surfactant - Google Patents
Method for regulating and controlling rapid emulsion breaking and re-stabilizing of emulsion without using surfactant Download PDFInfo
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Abstract
The invention discloses a method for regulating and controlling rapid emulsion breaking and re-stabilization of an emulsion without using a surfactant, belonging to the field of colloid and interfacial chemistry. The invention uses the composite emulsifier composed of inorganic nano-particles and organic amine compound, and does not contain any surfactant component to prepare O/W type emulsion; the emulsion is then broken by adding an acid to the emulsion and then neutralizing the previously added acid by adding a base to form a stable emulsion. The process can be circulated for many times and can be realized in aqueous solution. After demulsification, all components of the composite emulsifier enter the water phase, so that the water phase can be used as a carrier of the emulsifier for repeated use. The invention provides a method for efficiently regulating and controlling the emulsion with low cost, and has important application in the aspects of emulsion polymerization, oil product transportation, catalysis and the like.
Description
Technical Field
The invention relates to a method for regulating and controlling rapid emulsion breaking and re-stabilization of an emulsion without using a surfactant, belonging to the technical field of colloid and interface chemistry.
Background
An emulsion is a liquid-liquid dispersion of two liquids which are immiscible with each other, the phase present in the form of droplets being the dispersed phase and the other the continuous phase. The emulsions are usually oil-water dispersions, and O/W emulsions and W/O emulsions are common. Emulsions are widely used in many different technical fields, such as cosmetics, food, pharmaceuticals, crude oil transportation, emulsion polymerization, etc. At the same time, the application of demulsification and restabilization of emulsions in the fields of daily life and industrial technology is of great importance. On the one hand, some emulsions, such as food products, cosmetics, etc., require good stability during application. On the other hand, in some applications it is desirable that the emulsion be able to break and phase separate quickly, such as in crude oil transportation, emulsion polymerization, and the like. Therefore, emulsions with fast emulsion breaking and stimulus response characteristics are in urgent need in many fields.
Conventional emulsions, which typically use surfactants or amphiphilic polymers as emulsifiers, are thermodynamically unstable systems and require large amounts of surfactant. Pickering emulsion is an emulsion stabilized by surface active particles, generally has small dosage of emulsifier and good emulsion stability, and has wide application in many fields. However, the problem with high stability is the difficulty of breaking the emulsion. In recent years, surfactant particles prepared by in-situ hydrophobization of surfactants have been better controllable. The stability of the emulsion can be smoothly adjusted by adding ions with opposite charges or introducing nitrogen/carbon dioxide, light, electricity, magnetism and other response mechanisms. However, these methods also have certain problems. For example, when the emulsion is controlled by ion pair method, the formed surfactant ion pair with weaker polarity is easy to enter the oil phase, and the oil phase is polluted. This is unacceptable for some industrial processes where the oil phase is the final product. The organic substances used in the regulation processes of nitrogen/carbon dioxide, light, electricity, magnetism, etc. also involve the problems of contamination of the oil phase and difficulty in recovery from the emulsion system. In addition, these control measures generally have the problems of difficulty in recycling the emulsifier and high equipment cost. Therefore, it is a goal pursued in the field of emulsion regulation to develop a method for regulating and controlling an emulsion, which does not cause pollution to an oil phase, can smoothly recover an emulsifier, and is low in cost.
Disclosure of Invention
Technical problem
Conventional stimulus-responsive surfactants de-emulsify emulsions by deactivating themselves by manipulating hydrophilic groups. However, this method often causes the deactivated surfactant to enter the oil phase, which affects the quality of the oil phase and makes the surfactant difficult to recycle. In addition, the emulsion stabilized by a surfactant alone needs to cover an entire interfacial film, which causes problems such as a large amount of the surfactant to be used and high cost. The Pickering emulsion stabilized by the surfactant and the inorganic nano-particles has poor controllability although the dosage of the surfactant is reduced to a certain extent. And generally, the preparation of the controllable particles needs to introduce a stimulus response functional group, so that the preparation cost is increased in a phase-changing manner, and the application range of the controllable particles is limited. The invention provides a composite emulsifier formed by organic amine compounds and hydrophilic inorganic nano particles, and a novel stimulus response type emulsion is prepared to solve the problems.
Technical scheme
The invention provides a method for quickly demulsifying and re-stabilizing an adjustable emulsion without surfactant components. The inorganic nano particles and the organic amine compound form a composite emulsifier which is cooperated to stabilize the emulsion, amino groups can be converted into amine salts to be ionized by adding inorganic acid or organic acid, the amine salts are desorbed from a solid interface, the composite emulsifier is disintegrated and loses the emulsifying capacity, and the emulsion is rapidly demulsified. After the addition of the base, the previously added acid component is neutralized, the amine compound is reduced, the complex emulsifier is formed again, and the emulsion can be re-stabilized. This demulsification-restabilization process may be cycled many times.
The first purpose of the invention is to provide a method for regulating and controlling O/W emulsion to rapidly break emulsion and then stabilize, wherein the method is to form O/W emulsion by using a composite emulsifier formed by inorganic nano particles and an organic amine compound; then adding an acid component with the molar quantity equal to that of amino contained in the organic amine compound into the emulsion to carry out emulsion breaking by a emulsion breaking method; and neutralizing the acid component by adding alkali to form stable emulsion again.
In some embodiments, the organic amine compound has an alkane chain length of 4 to 12, and may contain one or more amino groups at any position of the alkane chain.
In some embodiments, the amount ratio of the organic amine compound to the inorganic nanoparticles in the composite emulsifier is (0.0001 to 100) mmol: (0.0001-0.5) g.
In some embodiments, the effective concentration of the organic amine compound is from 0.0001 to 100mmol/L (relative to the aqueous phase).
In some embodiments, the effective concentration of the inorganic nanoparticles is 0.001wt.% to 5wt.% of its mass fraction in the aqueous phase.
In some embodiments, the nanoparticles may be any one or more of the following nanoparticles having a particle diameter of 1nm to 1 μm, in any ratio: nano silica particles, nano alumina particles, nano calcium carbonate particles, nano titanium dioxide particles, nano iron oxide particles, nano zinc oxide particles, nano hectorite and the like.
In some embodiments, the acid component includes an organic acid and an inorganic acid. Wherein the inorganic acid is HCI, H 2 SO 4 、H 2 CO 3 Any one or more of the above in combination in any proportion; the organic acid is any one or combination of more of formic acid, acetic acid, propionic acid and the like in any proportion.
In some embodiments, the base is any one or combination of sodium hydroxide, potassium hydroxide, and the like, in any ratio.
In some embodiments, the oil phase of the emulsion may be any one or more of: alkanes, aromatics, triglycerides, fatty acid esters.
In some embodiments, the time for rapid demulsification is within 10 seconds.
The invention also provides the application of the method for regulating and controlling the O/W emulsion to rapidly demulsify and re-stabilize in the fields of oil product transportation, emulsion polymerization, nano material synthesis, catalysis and the like.
Has the advantages that:
the emulsion of the invention is stabilized by the composite emulsifier composed of inorganic nano-particles and organic amine compound, and has good stability. The system does not contain surfactant components, has low cost, wide material sources and a plurality of combinations, is suitable for the fields of food, cosmetics, medicines, crude oil and the like, and has wide application. When inorganic acid or organic acid is added, the emulsion can be rapidly broken within 10s, the emulsifier components completely enter the water phase, and the water phase can be recycled and used in a new emulsification process again. After the alkali is added, homogenization can form stable emulsion again, and the emulsion breaking-re-stabilizing process can be repeated for hundreds of times. The characteristic plays an important role in the fields of oil product transportation, emulsion polymerization, material synthesis, catalysis and the like, and can greatly reduce the use cost.
Drawings
Fig. 1 is a photograph of the appearance of a 0.3wt.% nano-silica particle stabilized with different concentrations of n-octylamine n-decane/water (3 mL/3 mL) emulsion. Shoot (B) after preparation for 24h (A) and 7 d. The n-octylamine concentration is 0.5,1,1.5,2,3 and 6mmol/L from the 3 rd to the right respectively.
Photomicrographs of n-decane/water (3 mL/3 mL) emulsions stabilized with 0.3wt.% nanosilica particles together with different concentrations of n-octylamine. The n-octylamine concentration was 0.5,1,1.5,2,3 and 6mmol/L from left to right, respectively. Preparation of 7d post-shot (C).
FIG. 2 is a photograph of the appearance of a 0.3wt.% nano-alumina particle stabilized with different concentrations of n-octylamine in a n-decane/water (3 mL/3 mL) emulsion. Shoot (B) after preparation for 24h (A) and 7 d. The n-octylamine concentration is 0.001,0.003,0.006,0.01,0.03,0.06,0.1,0.3,0.6,1,3 and 6mmol/L from the 3 rd to the right respectively.
Photomicrographs of n-decane/water (3 mL/3 mL) emulsions stabilized with 0.3wt.% nano-alumina particles together with different concentrations of n-octylamine. The n-octylamine concentration is 0.01,0.03,0.06,0.1,0.3,0.6,1,3 and 6mmol/L from left to right respectively. Shoot (C) after preparation of 7 d.
FIG. 3 is a photograph of the appearance of N-decane/water (3 mL/3 mL) emulsions stabilized with 0.3wt.% nano-silica particles and varying concentrations of N, N-dimethylhexadecylamine. Shoot (B) after preparation for 24h (A) and 7 d. The N, N-dimethylhexadecylamine concentrations from left to right were 0.001,0.01,0.1,1 and 10mmol/L, respectively.
Photomicrographs of N-decane/water (3 mL/3 mL) emulsions stabilized with 0.3wt.% nanosilica particles together with different concentrations of N, N dimethylhexadecylamine. The N, N dimethylhexadecylamine concentrations were 0.01,0.1,1 and 10mmol/L, respectively, from left to right. Shoot (C) after preparation of 7 d.
FIG. 4 is a photograph of the appearance of n-decane/water (3 mL/3 mL) emulsions stabilized with 0.3wt.% nano-silica particles in combination with varying concentrations of decamethylene diamine. Shoot (B) after preparation for 24h (A) and 7 d. Decamethylenediamine concentrations from left to right were 0.01,0.03,0.06,0.1,0.3,0.6,1,2,3 and 6mmol/L, respectively.
Photomicrographs of n-decane/water (3 mL/3 mL) emulsion stabilized with 0.3wt.% nano silica particles together with varying concentrations of decamethylene diamine. Decamethylenediamine concentrations from left to right were 0.6,1,2,3 and 6mmol/L, respectively. Shoot (C) after preparation of 7 d.
FIG. 5 is an appearance and photomicrograph of a demulsification-reemulsification cycle process in which nano silica particles and n-octylamine stabilized n-decane/water emulsion did not change oil phase, taken 24h after emulsification/0.5 h after demulsification. The initial emulsion was synergistically stabilized with 0.3wt.% nanosilica particles and 1mmol/L n-octylamine, then broken by alternate addition of 1mol/L HCl, broken by addition of 1mol/L NaOH and homogenized and re-emulsified.
FIG. 6 is an appearance and photomicrograph of a demulsification-reemulsification cycle process in which nano silica particles and decamethylene diamine stabilized n-decane/water emulsion did not change oil phase, taken 24h after emulsification/0.5 h after demulsification. The initial emulsion was synergistically stabilized with 0.3wt.% nanosilica particles and 3mmol/L decamethylenediamine, then broken by alternating addition of 1mol/L HCl, homogenized with 1mol/L NaOH and re-emulsified.
FIG. 7 is an appearance and photomicrograph of a demulsification-reemulsification cycle process in which nano silica particles and decamethylene diamine stabilized n-decane/water emulsion replaced the oil phase, taken 24h after emulsification/0.5 h after demulsification. The initial emulsion was synergistically stabilized with 0.3wt.% nanosilica particles and 3mmol/L decamethylenediamine, then broken by alternating addition of 1mol/L HCl, homogenized with 1mol/L NaOH and re-emulsified.
FIG. 8 is a nuclear magnetic hydrogen spectrum of decamethylenediamine directly dissolved in toluene.
FIG. 9 is the nuclear magnetic hydrogen spectrum of toluene in the oil phase after emulsion breaking.
FIG. 10 is an appearance and photomicrograph of a demulsification-reemulsification cycle of a nanosilica particle and 1,12-diaminododecane stabilized n-decane/water emulsion replacing the oil phase taken 24h after emulsification/0.5 h after demulsification. The initial emulsion was synergistically stabilized with 0.3wt.% nanosilica particles and 1 mmol/L1,12-diaminododecane, then broken by alternating addition of 1mol/L HCl, addition of 1mol/L NaOH and homogenization and re-emulsification.
FIG. 11 is a photograph of the appearance of a n-decane/water emulsion stabilized with nanosilica particles and tetradecylamine.
Detailed Description
Example 1: nano silicon dioxide particle and n-octylamine composite emulsifier stabilized n-decane/water emulsion.
0.021g of nano silica particles (0.3 wt.%) are dispersed in n-octylamine solutions with concentrations of 0.5,1,1.5,2,3 and 6mmol/L, respectively, and the volume ratio of oil to water is 1:1, 3mL of n-decane was added, and the mixture was homogenized for 2min at 11000rpm using a homogenizer to obtain a stable emulsion.
As shown in fig. 1, the presence of nano silica particles alone does not stabilize the emulsion, nor does it form a stable emulsion in the presence of n-octylamine alone. Dispersing the nano silicon dioxide particles into n-octylamine solution to form a composite emulsifier, and obtaining stable O/W type emulsion when the concentration of n-octylamine is more than 0.5 mmol/L. And the particle size of the dispersed phase in the emulsion becomes smaller with the increase of the n-octylamine concentration. After standing for six months, the appearance of the emulsion was essentially unchanged, indicating that the resulting emulsion had good stability.
Example 2: the n-decane/water emulsion is stabilized by nano alumina particles and n-octylamine composite emulsifier.
0.021g of nano alumina particles (0.3 wt.%) were dispersed in n-octylamine solutions at concentrations of 0.001,0.003,0.006,0.01,0.03,0.06,0.1,0.3,0.6,1,3 and 6mmol/L, respectively, in a volume ratio of oil to water of 1:1, 3mL of n-decane was added, and the mixture was homogenized for 2min at 11000rpm using a homogenizer to obtain a stable emulsion.
As shown in fig. 2, the presence of nano-alumina particles alone did not stabilize the emulsion, nor did it form a stable emulsion in the presence of n-octylamine alone. Dispersing the nano alumina particles into n-octylamine solution to form a composite emulsifier, and obtaining stable O/W type emulsion when the concentration of n-octylamine is more than 0.03 mmol/L. And the particle size of the dispersed phase in the emulsion becomes smaller with the increase of the n-octylamine concentration. After standing for six months, the appearance of the emulsion was substantially unchanged, indicating that the resulting emulsion had good stability.
Example 3: n-decane/water emulsion stabilised with nanosilica particles and N, N-dimethylhexadecylamine
Preparing 0.3wt.% nanometer silicon dioxide particles and a N-decane/water system of N, N dimethyl hexadecylamine with the concentration of 0.001,0.01,0.1,1 and 10mmol/L respectively, and homogenizing for 2min at 11000rpm by using a homogenizer to obtain a stable emulsion.
As shown in fig. 3, the presence of nano silica particles alone did not stabilize the emulsion, nor did the presence of N, N dimethylhexadecylamine alone form a stable emulsion. The emulsifier formed by the two after being compounded can prepare stable O/W type emulsion when the concentration of N, N dimethyl hexadecylamine is more than 1 mmol/L. And the particle size of the dispersed phase in the emulsion becomes smaller with the increase of the concentration of the N, N-dimethylhexadecylamine. After standing for six months, the appearance of the emulsion was essentially unchanged, indicating that the resulting emulsion had good stability.
Example 4: n-decane/water emulsion stabilized by nano silicon dioxide particles and decamethylene diamine
0.021g of nano silica particles (0.3 wt.%) were dispersed in a solution of 0.1,0.3,0.6,1,2,3 and 6mmol/L decamethylenediamine, respectively, in a volume ratio of oil to water of 1:1, 3mL of n-decane was added, and the mixture was homogenized for 2min at 11000rpm using a homogenizer to obtain a stable emulsion.
As shown in fig. 4, the presence of nano silica particles alone does not stabilize the emulsion, nor does decamethylene diamine alone form a stable emulsion. The silicon dioxide particles are dispersed into decamethylene diamine solution to form the composite emulsifier, and when the decamethylene diamine concentration is more than 0.6mmol/L, stable O/W type emulsion can be obtained. And the particle size of the emulsion droplets becomes smaller as the concentration of decamethylene diamine increases. After standing for six months, the appearance of the emulsion was essentially unchanged, indicating that the resulting emulsion had good stability.
Example 5: rapid demulsification and restabilization circulation of nano silicon dioxide particle and n-octylamine compound stabilized n-decane/water emulsion without changing oil phase
Weighing a certain mass of nano silicon dioxide particles, and ultrasonically dispersing the nano silicon dioxide particles in a 1mmol/L n-octylamine solution, wherein the concentration of the nano silicon dioxide particles in the solution is 0.3wt.%. Adding 7mL of the mixture into a 25mL sample bottle, taking n-decane as an oil phase, and mixing the oil phase with the oil phase in a ratio of 1:1 (7mL. Homogenizing for 2min at 11000rpm using a homogenizer to obtain a stable emulsion. The emulsion was stored in an incubator at 25 ℃ and after 24 hours, appearance photographs and micrographs of the emulsion were taken, as shown in the initial emulsion in FIG. 5. Then adding a certain amount of 1mol/L HCl into the emulsion at room temperature, uniformly mixing, observing emulsion breaking of the emulsion, and taking an appearance picture after 30 min. Then adding equal amount of 1mol/L NaOH solution at room temperature, mixing uniformly, homogenizing and emulsifying with a homogenizer to obtain stable emulsion again, and taking appearance and photomicrograph after 24 h. The above experiment was repeated to break and re-stabilize the emulsion a second time. As shown in fig. 5, this cycle may be repeated multiple times.
Example 6: rapid demulsification and re-stabilization circulation of oil phase-unchanged n-decane/water emulsion stabilized by nano silicon dioxide particles and decamethylene diamine compound
Weighing a certain mass of nano silicon dioxide particles, and ultrasonically dispersing the nano silicon dioxide particles in a 3mmol/L decamethylenediamine solution, wherein the concentration of the nano silicon dioxide particles in the solution is 0.3wt.%. Adding 7mL of the mixture into a 25mL sample bottle, taking n-decane as an oil phase, and mixing the oil phase with the water phase in a ratio of 1:1 (7mL. Homogenizing for 2min at 11000rpm using a homogenizer to obtain a stable emulsion. Storing in 25 deg.C incubator, and taking appearance photograph and micrographs of the emulsion after 24 hr. As shown in the initial emulsion in fig. 6. Then adding a certain amount of 1mol/L HCl into the emulsion at room temperature, uniformly mixing, and observing that the emulsion breaks within about 10 s. Appearance photographs were taken after 30 min. Then adding equal amount of 1mol/L NaOH solution at room temperature, mixing uniformly, homogenizing and emulsifying by a homogenizer to obtain stable emulsion again, and taking appearance and photomicrograph after 24 h. The above experiment was repeated to break the emulsion a second time and re-stabilize it. As shown in fig. 6, the cycling process can be repeated multiple times with the dispersed phase droplet size remaining substantially unchanged after cycling.
Example 7: rapid demulsification and re-stabilization circulation of oil phase replacement for n-decane/water emulsion stabilized by nano silicon dioxide particles and decamethylene diamine compound
Weighing a certain mass of nano silicon dioxide particles, and ultrasonically dispersing the nano silicon dioxide particles in a 3mmol/L decamethylenediamine solution, wherein the concentration of the nano silicon dioxide particles in the solution is 0.3wt.%. Adding 7mL of the mixture into a 25mL sample bottle, taking n-decane as an oil phase, and mixing the oil phase with the oil phase in a ratio of 1:1 (7mL. Homogenizing for 2min at 11000rpm using a homogenizer to obtain a stable emulsion. Storing in an incubator at 25 ℃, and taking appearance pictures and micrographs of the emulsion after 24 h. As shown in the initial emulsion in fig. 7. Then adding a certain amount of 1mol/L HCl into the emulsion at room temperature, uniformly mixing, observing that the emulsion breaks within about 10s, and taking an appearance picture after 30 min. Taking out the demulsified oil phase, replacing with fresh n-decane, adding an equal amount of 1mol/L NaOH solution at room temperature, mixing uniformly, homogenizing and emulsifying by a homogenizer to obtain stable emulsion again, and taking appearance and photomicrographs after 24 h. The above experiment was repeated to break and re-stabilize the emulsion a second time. As shown in fig. 7, the state of the n-decane-replaced emulsion was substantially identical to that of the non-oil-replaced emulsion.
Example 8: detection of emulsifier composition in oil phase
The oil phase after emulsion breaking in example 6 was subjected to nmr hydrogen spectroscopy. Because decamethylenediamine has poor solubility in n-decane, toluene with higher solubility was used as the oil phase for the detection. Firstly, directly dissolving decamethylene diamine in toluene to form a toluene solution of decamethylene diamine, wherein the molar ratio of decamethylene diamine to toluene is 1:78.5. then, a certain volume of the solution is dissolved in deuterated reagent methanol, so that the decamethylene diamine accounts for 0.09wt% of the solution. It can be seen from FIG. 8 that although the concentration of decamethylenediamine is less than one thousandth at this time, a hydrogen nuclear magnetic resonance peak attributed to decamethylenediamine is clearly seen at 2.63,1.48,1.34. Fig. 9 is a nuclear magnetic spectrum of oil phase toluene after demulsification, wherein the concentration of the oil phase toluene in the deuterated reagent is the same as that in the experiment. However, no corresponding peak was found for decamethylenediamine in this figure. This demonstrates that after the emulsion is broken, the decamethylenediamine concentration in the oil phase is very low or absent and passes completely into the water phase.
Example 9: rapid demulsification and re-stabilization circulation of oil phase replacement for n-decane/water emulsion stabilized by nano silica particles and 1,12-diaminododecane composite
Weighing a certain mass of nano silicon dioxide particles, and ultrasonically dispersing the nano silicon dioxide particles in a 1 mmol/L1,12-diaminododecane solution, wherein the concentration of the nano silicon dioxide particles in the solution is 0.3wt.%. Adding 7mL of the mixture into a 25mL sample bottle, taking n-decane as an oil phase, and mixing the oil phase with the oil phase in a ratio of 1:1 (7mL. Homogenizing for 2min at 11000rpm using a homogenizer to obtain a stable emulsion. The emulsion was stored in an incubator at 25 ℃ and after 24 hours appearance and micrographs of the emulsion were taken as shown in the initial emulsion in FIG. 10. Then adding a certain amount of 1mol/L HCl into the emulsion at room temperature, uniformly mixing, observing that the emulsion breaks within about 10s, and taking an appearance picture after 30 min. Taking out the demulsified oil phase, replacing with fresh n-decane, adding an equal amount of 1mol/L NaOH solution at room temperature, mixing uniformly, homogenizing and emulsifying by a homogenizer to obtain stable emulsion again, and taking appearance and photomicrographs after 24 h. The above experiment was repeated to break and re-stabilize the emulsion a second time. As shown in fig. 10, this cycling process can be repeated multiple times with the dispersed phase droplet size remaining substantially unchanged after cycling.
Comparative example 1 n-decane/water emulsion stabilised by nanosilica particles and tetradecylamine complex
Preparing a n-decane/water system with 0.3wt.% of nano silicon dioxide particles and 0.05mmol/L of tetradecylamine, and homogenizing for 2min at 11000rpm by using a homogenizer to obtain a stable emulsion. Then, a certain amount of 1mol/L HCl was added to the emulsion at room temperature, and the mixture was mixed uniformly, as shown in FIG. 11, and after standing for 1 hour, the emulsion was not broken.
Claims (9)
1. A method for regulating and controlling O/W type emulsion to carry out rapid emulsion breaking and re-stabilizing without using a surfactant is characterized by comprising the following steps: preparing an emulsion by using a composite emulsifier consisting of inorganic nanoparticles and an organic amine compound; then demulsifying by adding an acid component with the molar quantity equal to that of amino contained in the organic amine; then, adding alkali to neutralize acid components to realize re-stabilization;
the organic amine compound is any one of n-octylamine, decamethylene diamine and 1,12-diaminododecane.
2. The method according to claim 1, wherein the composite amount ratio of the organic amine compound to the inorganic nanoparticles in the composite emulsifier is (0.0001-100) mmol: (0.0001-0.5) g.
3. The method according to claim 1, wherein the organic amine compound is used in an amount of 0.0001 to 100mmol/L relative to the aqueous phase.
4. The method of claim 1, wherein the inorganic nanoparticles are present in an amount of from 0.001wt to 5 wt% relative to the aqueous phase.
5. The method of claim 1, wherein the inorganic nanoparticles have a particle diameter of 1nm to 1 μ ι η; the inorganic nanoparticles are selected from any one or more of the following: nano silicon dioxide particles, nano aluminum oxide particles, nano calcium carbonate particles, nano titanium dioxide particles, nano iron oxide particles, nano zinc oxide particles and nano hectorite.
6. The method according to claim 1, wherein the oil phase of the emulsion is selected from any one or more of the following mixtures in any ratio: alkanes, aromatics, triglycerides, fatty acid esters.
7. Use of the process according to any one of claims 1 to 6 in the field of oil transportation.
8. Use of the method according to any one of claims 1 to 6 in the field of emulsion polymerization, nanomaterial synthesis.
9. Use of the process according to any one of claims 1 to 6 in the field of catalysis.
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| CN113731208A (en) | 2021-12-03 |
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