CN110596429A - Characterization method for regulating and controlling oil drop mechanical behavior by block type polymer - Google Patents
Characterization method for regulating and controlling oil drop mechanical behavior by block type polymer Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/24—AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes
Abstract
The invention provides a characterization method for regulating and controlling oil drop mechanical behavior by using a block type polymer. The method comprises the following steps: respectively adhering oil drops with block type polymers adsorbed on the surfaces on a micro-cantilever probe and a substrate by adopting an atomic force microscope, wherein the two oil drops are positioned at the positions of upper and lower right-axis symmetry; the block polymer has a hydrophilic end and a hydrophobic end; oil droplets on the substrate are in a salt solution with a block polymer dissolved therein; setting atomic force microscope parameters to enable two oil drops to generate opposite collision, and measuring acting force between the oil drops; sequentially adopting continuous phases with different salt ion concentrations and different block polymer concentrations to displace the previous continuous phase, and measuring the acting force among oil drops; and (3) obtaining an oil drop acting force curve under the continuous phase, and realizing the representation of the mechanical behavior of the block-type polymer regulated oil drop. The method can characterize the influence of the aggregation and even precipitation of the block polymer in the continuous phase on the interaction between oil drops, and provides reference for the research of the properties of a dispersion system containing the block polymer.
Description
Technical Field
The invention belongs to the technical field of petrochemical engineering for researching physical and chemical properties of emulsion, and particularly relates to a characterization method for regulating and controlling oil drop mechanical behavior by using a block type polymer.
Background
Surfactant-containing oil-and-water emulsions are present in various fields of industrial production, such as the petrochemical, cosmetic, pharmaceutical and food industries.
An oil-water emulsion is a complex mixture of elements present in such a way that one liquid is dispersed into droplets by another liquid. This presence allows for large differences in both the macro-flow characteristics and the micro-properties of the system from a single phase. The oil-water emulsion has many complex behaviors, such as droplet brownian motion, turbulence disturbance, density difference, interface shearing and the like, and under the influence of the actions, the droplets in the dispersed phase can break, flocculate, coalesce and the like, so that the properties of the system are extremely complex.
The adsorption of surface active substances on an oil-water interface can greatly influence the stability of the oil-water interface, thereby changing the property of an oil-water system. In industrial production, surface active substances are often added to oil-water emulsions to change the properties of the oil-water emulsion to achieve desired properties.
In the petroleum industry, for example, certain chemicals added to the process flow can adsorb at the oil-water interface and become surface active. Crude oil directly produced in a stratum often contains a large amount of natural surfactants such as colloid and asphaltene, so that a large amount of emulsion is produced, and the property of the emulsion is obviously influenced.
The stability of an emulsion is determined on a microscopic scale mainly by the ease of flocculation of dispersed phase droplets, interfacial film rupture, droplet coalescence and settling of large droplets. Numerous studies have found that the nature of the oil-water interface in surfactant containing systems can have a large effect on the stability of the emulsion.
Coalescence of droplets depends on the mechanical action of two droplets when they collide with each other. Therefore, the research on the interaction of the two liquid drops is helpful for further deepening the micro understanding of the dispersed phase system and deepening the research on the demulsification mechanism, and has important significance.
Disclosure of Invention
The invention aims to provide a characterization method for regulating and controlling oil drop mechanical behavior by using a block type polymer. The method can effectively regulate and control the interaction force among oil drops in a dispersion system in the presence of a block polymer; the method characterizes the influence of the aggregation and even precipitation of macromolecular substances in a continuous phase on the interaction between oil drops, and provides reference for the research of the properties of a dispersion system containing a block polymer.
The purpose of the invention is realized by the following technical means:
the invention provides a characterization method for regulating and controlling oil drop mechanical behavior by using a block type polymer, which comprises the following steps:
respectively adhering oil drops with block type polymers adsorbed on the surfaces to a micro-cantilever probe and a substrate of an atomic force microscope by adopting the atomic force microscope, wherein the two oil drops are positioned at the positions of upper and lower right-axis symmetry; the block polymer has a hydrophilic end and a hydrophobic end;
the oil droplets on the substrate are in a first continuous phase environment, the first continuous phase being a salt solution in which a block-type polymer is dissolved;
setting the collision speed and the collision force of an atomic force microscope to enable the two oil drops to generate opposite collision, and measuring the acting force between the oil drops;
sequentially adopting continuous phases with different salt ion concentrations and different block polymer concentrations to displace the previous continuous phase, extruding the previous continuous phase, realizing the change and replacement of the continuous phase, and measuring the acting force among oil drops under the same collision condition;
and (3) obtaining oil drop acting force curves under continuous phases with different salt ion concentrations and different block-type polymer concentrations, and realizing the representation of the mechanical behavior of the block-type polymer regulating oil drops.
A block type polymer belongs to a macromolecular surface active substance and consists of a hydrophobic end (oleophilic end) and a hydrophilic end, wherein the hydrophobic end is adsorbed on the surface of oil drops to further change the property of an oil-water interface. The adsorption of the block-type polymer on an oil-water interface can enable the surfaces of oil drops to form a structure similar to a polymer hairbrush, and the coalescence of the oil drops is hindered in the process that two oil drops approach when the repulsion between the oil drops is increased. Meanwhile, the mechanism of dissolving the block polymer in a continuous phase such as a water phase is that hydrophilic groups of the block polymer form a hydrated film in water; at high salt ion concentration, because the binding capacity of salt ions and water molecules is stronger than that of macromolecular surface active substances, a hydration film around an active agent is damaged, and a block polymer tends to form an aggregate with a hydrophilic end outside and a hydrophobic end inside, and even precipitates. In the continuous phase, large aggregates can generate larger obstruction effect on the coalescence of oil drops relative to dispersed single blocky polymer molecules, prevent the oil drops from coalescing and improve the stability of the oil-water dispersion system.
In the invention, the mechanical behavior of the oil drops mainly refers to the acting force of mutual collision among the oil drops and the influence on the stability of the oil-water dispersion system.
In the invention, in an oil-water dispersion system in which the block polymer exists, the adsorption quantity of the block polymer on an interface is changed by adjusting the concentration of the macromolecular block polymer, and the concentration of salt ions in a continuous phase is adjusted (such as increasing the concentration of the salt ions), and the self-assembly behavior of the salt is controlled by utilizing the salt, so that the size of macromolecular surface active substance aggregates in the block polymer is changed, the resistance among oil drops in the dispersion system is increased, the coalescence is prevented, and the stability of the dispersion system is further improved.
In one embodiment of the present invention, it can be seen that, under the condition of low salt ion concentration, the larger the concentration of the block polymer in the continuous phase, the larger the adsorption amount of the block polymer on oil droplets, the larger the obstruction of the interaction between oil droplets, the less tendency for the oil droplets to coalesce, and the more stable the oil-water dispersion system.
In another embodiment of the invention, it can be seen that by changing the concentration of salt ions in the continuous phase, the repulsive force between oil droplets is also significantly increased with the increase of the concentration of salt ions, and the increase of the concentration of salt ions can significantly increase the size of the aggregate of the block-type polymer in the oil-water dispersion system, so that the steric hindrance between two oil droplets is increased, the interaction force between the oil droplets is further increased, the oil droplets are more difficult to coalesce due to the larger resistance, and the stability of the oil-water dispersion system is further improved.
The method can effectively regulate and control the interaction force between oil drops in a dispersion system under the condition of the existence of the block polymer in a micro-nano scale, analyze the adsorption of the block polymer on the surface of oil and water and the influence of the existence and aggregation of the block polymer in a continuous phase on the interaction of the oil drops, represent the influence of the aggregation and even precipitation of macromolecular substances in the continuous phase on the interaction between the oil drops, provide reference for the research on the properties of the dispersion system containing the block polymer, and improve the understanding of the interaction between oil drops in an oil-water dispersion phase in the existence of the block polymer.
In the invention, an Atomic Force Microscope (AFM) is used for controlling two oil drops to generate a positive collision at a constant speed. The atomic force microscope is characterized in that a core component of the atomic force microscope is a micro-cantilever, when a probe of the micro-cantilever is in contact with the surface of a sample, due to the fact that weak repulsive force exists between probe tip atoms and sample surface atoms, the micro-cantilever generates certain linear elastic deformation, the deformation degree is obtained through laser, then acting force is obtained, and a force curve of stress changing along with time in the whole interaction process is measured and recorded through AFM. The AFM measurement of the present invention was performed using a Multimode8 model liquid probe holder MTFML-V2, manufactured by Bruker, USA.
In the above method, preferably, the method of adhering an oil droplet to each of the micro-cantilever probe and the substrate of the atomic force microscope comprises:
spraying a plurality of oil drops on a substrate (preferably a silicon wafer substrate) of an atomic force microscope by using an injector (preferably an ultra-fine injector);
dissolving the block-type polymer in a salt solution and covering the surface of a substrate with oil drops to form a system in which the oil drops are dispersed phases and the salt solution in which the block-type polymer is dissolved is a continuous phase;
standing to enable the oil drops to adsorb the block polymer, selecting two oil drops with proper sizes and adsorbing the block polymer from the substrate, removing other oil drops, and adhering one oil drop to the substrate through a micro-cantilever probe of an atomic force microscope;
wherein the lipophilicity of the microcantilever probe is greater than that of the substrate.
In the above method, the block-type polymer can be adsorbed on the surface of the oil droplets by a standing treatment, and the preferred standing time is 30 min. In addition, since the lipophilicity of the probe is greater than that of the substrate, the adhesion of the probe to the oil droplet is greater than that of the substrate; the oil drops contact with the substrate through the probes, and then the probes move away from the substrate, so that the oil drops are adhered to the probes and separated from the substrate, and the oil drops can be transferred from the substrate to the probes. The oil drops on the probe and the oil drops on the substrate are in the positions of up-down positive axial symmetry by setting the AFM. The distance between the two oil drops needs to meet the requirement that the continuous phase can contact the upper oil drop and the lower oil drop in the continuous phase displacement process; preferably, the distance between two oil droplets is 2 μm.
In the above method, preferably, the salt in the salt solution in which the block copolymer is dissolved includes sodium chloride and/or potassium chloride, but is not limited thereto.
In the above method, preferably, the block polymer includes one of F68 block polymer, F108 block polymer, F88 block polymer, and the like; but is not limited thereto.
In the invention, a block polymer F68(PEO-PPO-PEO) is provided, wherein the middle chain is lipophilic group polyoxypropylene (PPO) and the two sides are hydrophilic group polyoxyethylene (PPO); when F68 is adsorbed in an oil-water interface, the oleophilic groups are immersed in oil drops, and the two hydrophilic groups extend towards a water phase; at higher adsorption concentrations, the F68 molecules are closely arranged and can form a 'polymer brush' on the surface of oil droplets.
In the above method, preferably, the oil droplets include n-tetradecane and/or silicone oil, etc.; but not limited thereto, oil droplets having a relatively high viscosity are suitable for the present invention.
In the above method, preferably, the collision velocity of the two oil droplets is a constant velocity, preferably 4 μm/s; the maximum collision force was 5 nN.
In the above method, preferably, the concentration of salt ions in the salt solution in which the block-type polymer is dissolved is 20mM to 500 mM; the concentration of the block polymer is 100-500. mu.M. In the invention, the block polymer can be dissolved in deionized water to prepare block polymer solutions with different concentrations, and then the block polymer solution can be directly mixed with a salt solution to obtain a salt solution in which the block polymer is dissolved.
In the method, the radius of the oil drop on the substrate and the micro-cantilever probe is preferably 30-100 μm.
In the above method, preferably, before the continuous phase with different salt ion concentrations and different block polymer concentrations is used to displace the previous continuous phase, a low-concentration salt solution without block polymer is used for displacement equilibrium; preferably the salt solution has a concentration of 20 mM. The method can examine the interaction force between oil drops when the block polymer molecules exist only on the surfaces of the oil drops.
In the above method, preferably, the collision and displacement process of the oil droplets is performed in a closed environment; further preferably, a space is enclosed by the O-ring rubber, so that the collision and displacement of oil droplets take place in the enclosed space.
In the invention, the former continuous phase is extruded out through the displacement of the former continuous phase by the latter continuous phase, the change and the replacement of the continuous phase are realized, liquid with the volume equivalent to ten times of that of a liquid groove (an O-shaped rubber ring forms a closed space) is injected in each displacement, the complete replacement of the former liquid is ensured, and the O-shaped rubber ring is provided with a liquid inlet and a liquid outlet for the displacement and is used for executing the corresponding displacement operation without damaging the sealing performance of the system. In addition, the latter continuous phase displaces the former continuous phase, and after the former continuous phase is extruded out, the mixture needs to be kept still for more than 15min to ensure that oil drops on the probe can adsorb the block polymer in the latter continuous phase again.
In the above method, preferably, the micro-cantilever probe is a gold-plated probe, and is soaked in a dodecyl mercaptan solution (preferably for 12 hours), and subjected to alcohol washing and nitrogen drying. By adopting the method, the mercaptan can be ensured to be adsorbed on the surface of the gold probe, and the treated probe has stronger lipophilicity compared with a substrate.
The invention has the beneficial effects that:
the method can effectively regulate and control the interaction force between oil drops in a dispersion system under the condition of the existence of the block polymer in a micro-nano scale, analyze the adsorption of the block polymer on the surface of oil and water and the influence of the existence and aggregation of the block polymer in a continuous phase on the interaction of the oil drops, represent the influence of the aggregation and even precipitation of macromolecular substances in the continuous phase on the interaction between the oil drops, provide reference for the research on the properties of the dispersion system containing the block polymer, and improve the understanding on the interaction between oil and water oil drops in the existence of the block polymer.
Drawings
FIG. 1 is a schematic representation of the interaction of droplets on an atomic force microscope in accordance with the present invention.
Fig. 2 is a schematic diagram of the displacement process of the present invention.
FIG. 3 is a graph comparing the results of the force measurement after displacement with pure NaCl solution after adsorption of F68 molecules by oil droplets in F68 salt solutions of concentrations of 100. mu.M and 500. mu.M, respectively, in example 1 of the present invention.
FIG. 4 is a graph comparing force curves of F68, 20mM NaCl solution and 20mM pure NaCl solution with a continuous phase of 100. mu.M in example 2 of the present invention.
FIG. 5 is a graph comparing force curves of F68, 20mM NaCl solution and 20mM pure NaCl solution in the continuous phase of 500. mu.M in example 2 of the present invention.
FIG. 6 is a graph showing a comparison of force curves at concentrations of 100mM, 300mM and 500mM of NaCl, respectively, at concentrations of 500. mu.M of the continuous phase F68 in example 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
The polymer used in the examples described below was a block polymer F68(PEO-PPO-PEO), the middle chain of which was a lipophilic polyoxypropylene (PPO) group and the two sides of which were hydrophilic polyoxyethylene (PPO). When F68 is adsorbed in the oil-water interface, the lipophilic groups are immersed in the oil drops, and the two hydrophilic groups extend towards the water phase. At higher adsorption concentrations, the F68 molecules are closely arranged and can form a 'polymer brush' on the surface of oil droplets.
The adopted dispersed phase oil drop is n-tetradecane; the continuous phase is a NaCl salt solution in which F68 is dissolved.
By adjusting the concentration of NaCl in the continuous phase, the aggregation state of the F68 molecule in the salt solution can be regulated. The F68 molecules self-assemble at high NaCl salt concentrations. The block polymer of F68 is soluble in water because its hydrophilic groups form a hydrated film in water. The ion binding ability of NaCl solution is stronger than that of F68 block polymer. The solubility of F68 will therefore decrease in solutions of high salt concentration, forming self-assembled aggregates with hydrophilic ends inside the outer hydrophobic ends.
In the examples, the interaction force of oil droplets in a F68 salt solution is directly measured by AFM, and the influence of F68 on the interaction between oil droplets by oil-water interface, namely oil droplet surface adsorption and existence in a bulk phase is characterized by a displacement method. By changing the concentration of NaCl, F68 can form aggregates in the bulk phase by using the salting-out principle, and the interaction between oil drops is further influenced.
AFM measurements were performed using a Multimode8 model liquid probe holder MTFML-V2, Bruker, USA.
The adsorption of the F68 surfactant on the surface of oil droplets in the example can be regarded as an irreversible process, namely, the change of the adsorption amount of the surfactant on the interface before and after displacement and the influence on the acting force between oil droplets can be ignored.
In the examples, a silicon wafer was used as a substrate; cleaning the O-shaped sealing ring and the substrate of the probe holder by using ethanol and water, and then drying by using nitrogen; all measurements were performed at pH 6 in solution.
F68 was dissolved in deionized water and sonicated for 1.5 hours to ensure complete dissolution for formulation into block polymer solutions of varying concentrations. Oil drops (tiny oil drops with the diameter of tens of microns) are sprayed on the substrate by an ultrafine injector. A larger continuous phase drop (NaCl solution dissolved with F68) (several millimeters in diameter) was slowly coated on the surface of a substrate with tiny oil drops to create a system with salt solution as the continuous phase and oil drops as the dispersed phase. After the substrate and the probe holder are installed in the AFM, an environment in which a salt solution is a continuous phase and oil drops are dispersed phases is formed in an O-shaped ring of the probe holder.
After the substrate and probe holder were mounted in the AFM, several oil droplets prepared at this time existed on the substrate, and one of the oil droplets was transferred to the probe to complete the measurement. Two oil drops with appropriate size are selected, the oil drops of the substrate are contacted by the probe, and one of the oil drops can be transferred from the substrate to the probe due to the fact that the lipophilicity of the probe is larger than that of the substrate, as shown in figure 1. The force can be measured by directing the drop on the probe against a selected drop on the substrate so that it is in direct contact with the substrate.
Example 1: the influence of the block polymer F68 on the acting force between oil drops when the block polymer F68 is adsorbed on the surface of the oil drops and exists in the body phase is verified
The collision was performed setting the two droplets to a velocity of 0.4 μm/s, with the radius of the droplets on the cantilever being 30 microns and the radius of the droplets on the substrate being 32 microns.
In this example, when the maximum interaction force is set by using a Multimode8 afm, which is manufactured by bruker, usa, it is necessary to set the maximum interaction force, and after the maximum interaction force is reached, the two oil droplets stop approaching each other and start separating, and the maximum collision force is set to 5 nN.
(1) The force of oil droplets in a 100. mu.M solution of F68 (20mM NaCl) was measured. After 30 minutes of adsorption process, F68 is fully adsorbed on the oil-water interface of oil drops.
(2) The displacement was performed with a pure 20mM NaCl solution (without F68), i.e. the continuous phase was changed to a pure 20mM NaCl solution and equilibrated for 10 minutes before the new force measurement was performed.
(3) The displacement was performed with 500. mu.M F68 solution (20mM NaCl) and the measurement was performed after 30 minutes of equilibration.
(4) The displacement was performed with 20mM NaCl solution and the measurement was performed after 10 minutes of equilibration.
The flow of the entire displacement is shown in fig. 2, and the force curves of the measurement results are shown in fig. 3, 4 and 5.
Fig. 3 shows the measured inter-oil droplet forces after displacement with pure NaCl solution after adsorption of F68 molecules on oil droplets in two different concentrations of F68 solutions of 100 μ M and 500 μ M, respectively. In this case F68 only adsorbed to the oil droplet surface and was not present in the continuous phase. As a result, it can be seen that the larger the concentration of F68 in the bulk phase, the larger the amount of adsorption, the larger the inhibition of the interaction between oil droplets, the less likely the oil droplets coalesce, and the more stable the system.
Figure 4 shows the oil droplet force comparison before and after displacement of 100 μ M F68 saline solution and pure saline solution. Figure 5 shows the oil droplet force comparison before and after displacement of 500 μ M F68 saline solution and pure saline solution.
It can be seen that the repulsion of the two oil droplets is greater when the copolymer is present in the continuous phase solution. After displacement with NaCl pure solution, the repulsive force decreased due to the disappearance of the F68 molecules in the continuous phase. The larger the concentration of F68 molecules in the continuous phase, the stronger the repulsive force. This suggests that the presence of polymer in the continuous phase causes more drag, hindering coalescence of the oil droplets.
Example 2: the influence of the size of F68 aggregates on the interaction between oil droplets at high salt concentration was verified
By increasing the concentration of NaCl in the continuous phase, the size of F68 molecular aggregates in the continuous phase can be increased, so that the property of the whole dispersion system is changed, dispersed oil drops in the dispersion system are not easy to coalesce, and the stability of the dispersion system is improved.
And (3) verifying the influence of the concentration of NaCl in the continuous phase on the action between oil drops by using a displacement experiment.
This effect is weaker at lower salt concentrations. Three solutions with NaCl concentrations of 100mM, 300mM and 500mM were used, respectively, wherein the F68 concentration was 500. mu.M for displacement measurement.
Fig. 6 shows the interaction force between two oil droplets in F68 solutions of different salt concentrations at a collision velocity of V-0.4 μm/s. The oil droplet radii on the substrate and on the cantilever were 30 and 31 microns, respectively. The maximum force setting was still 5 nN.
It can be seen that the repulsive force increases significantly with increasing NaCl concentration. It was demonstrated that an increase in salt concentration can significantly increase the size of F68 aggregates within the system. The steric hindrance between two oil drops is increased, the interaction force between the oil drops is further increased, the oil drops are more difficult to coalesce due to larger resistance, and the stability of the oil-water dispersion system is further improved.
From the above examples it can be seen that the presence of a block polymer in the bulk phase, especially at high salt concentrations, which forms aggregates, hinders coalescence of the oil droplets and increases the stability of the dispersion. The invention provides reference for the research of the properties of a dispersion system containing a block polymer, and improves the understanding of the interaction between oil droplets of an oil-water dispersed phase in the presence of the block polymer.
Claims (10)
1. A characterization method for regulating and controlling oil drop mechanical behavior by using a block type polymer comprises the following steps:
respectively adhering oil drops with block type polymers adsorbed on the surfaces to a micro-cantilever probe and a substrate of an atomic force microscope by adopting the atomic force microscope, wherein the two oil drops are positioned at the positions of upper and lower right-axis symmetry; the block polymer has a hydrophilic end and a hydrophobic end;
the oil droplets on the substrate are in a first continuous phase environment, the first continuous phase being a salt solution in which a block-type polymer is dissolved;
setting the collision speed and the collision force of an atomic force microscope to enable the two oil drops to generate opposite collision, and measuring the acting force between the oil drops;
sequentially adopting continuous phases with different salt ion concentrations and different block polymer concentrations to displace the previous continuous phase, extruding the previous continuous phase, realizing the change and replacement of the continuous phase, and measuring the acting force among oil drops under the same collision condition;
and (3) obtaining oil drop acting force curves under continuous phases with different salt ion concentrations and different block-type polymer concentrations, and realizing the representation of the mechanical behavior of the block-type polymer regulating oil drops.
2. The method of claim 1, wherein attaching an oil droplet to each of the micro-cantilever probe and the substrate of the atomic force microscope comprises:
spraying a plurality of oil drops on a substrate of an atomic force microscope by using an injector;
dissolving the block-type polymer in a salt solution and covering the surface of a substrate with oil drops to form a system in which the oil drops are dispersed phases and the salt solution in which the block-type polymer is dissolved is a continuous phase;
standing to enable the oil drops to adsorb the block polymer, selecting two oil drops adsorbing the block polymer from the substrate, removing other oil drops, and adhering one oil drop to the substrate through a micro-cantilever probe of an atomic force microscope;
wherein the lipophilicity of the microcantilever probe is greater than that of the substrate.
3. The method of claim 1 or 2, wherein the salt in the salt solution in which the block polymer is dissolved comprises sodium chloride and/or potassium chloride.
4. The method of any of claims 1-3, wherein the block polymer comprises one of an F68 block polymer, an F108 block polymer, and an F88 block polymer.
5. A method according to claim 1 or 2, wherein the oil droplets comprise n-tetradecane and/or silicone oil.
6. The method according to claim 1, wherein the collision velocity of two oil droplets is a constant velocity, preferably 0.1-1 μm/s; the maximum collision force was 5 nN.
7. The method according to claim 1, wherein the salt solution in which the block polymer is dissolved has a salt ion concentration of 20mM to 500 mM; the concentration of the block polymer is 100-500 mu M;
preferably, the radius of oil drops on the substrate and the micro-cantilever probe is 30-100 μm.
8. The method of claim 1, wherein prior to sequentially displacing the previous continuous phase with continuous phases of different salt ion concentrations and different blockwise polymer concentrations, a displacement equilibrium is performed with a low-concentration salt solution without blockwise polymer; preferably the salt solution has a concentration of 20 mM.
9. A method according to claim 1, wherein the collision and displacement of oil droplets is performed in a closed environment, preferably enclosed by an O-ring rubber, such that the collision and displacement of oil droplets is performed in the enclosed space.
10. The method of claim 1, wherein the micro-cantilever probe is a gold-plated probe, and is soaked in a dodecyl mercaptan solution and subjected to an alcohol washing and a nitrogen drying process.
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| 王玮: "分散体系中液滴间力学行为", 《科学通报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272612A (en) * | 2020-03-03 | 2020-06-12 | 西南石油大学 | Primary screening method of demulsifier |
| CN111272612B (en) * | 2020-03-03 | 2022-01-28 | 西南石油大学 | Primary screening method of demulsifier |
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