CN111847897B - Simple preparation method of magnetic-responsive super-hydrophobic surface - Google Patents
Simple preparation method of magnetic-responsive super-hydrophobic surface Download PDFInfo
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- C03C17/008—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character comprising a mixture of materials covered by two or more of the groups C03C17/02, C03C17/06, C03C17/22 and C03C17/28
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Abstract
The invention relates to a preparation method of a super-hydrophobic surface, in particular to a simple preparation method of a magnetic-responsive super-hydrophobic surface. The method comprises the following steps: step one, respectively measuring a PDMS prepolymer and a curing agent by using a balance, mixing according to a mass ratio of 10:1, measuring organic solvent silicone oil by using a measuring cylinder, pouring into a beaker, mixing, and uniformly stirring by using a glass rod; step two, weighing Fe powder with the particle diameter of 1-10 mu m by using a balance, pouring the Fe powder into a beaker, and continuously and violently stirring the Fe powder for more than 5min by using a glass rod until the Fe powder is stirred into a uniform black mixed solution; step three, placing the glass sheet substrate on a neodymium magnet, and uniformly spraying the mixed solution prepared in the step two onto the glass substrate by using a spray gun; and step four, putting the neodymium magnet and the glass substrate on the neodymium magnet in the step three into a drying oven for heating and curing, wherein the heating temperature is 60 ℃, and the heating time is 12 hours, so that the organic solvent silicone oil is volatilized, and the PDMS is cured to form a PDMS/iron particle composite columnar array microstructure, and finally the magnetic-responsiveness super-hydrophobic surface is obtained.
Description
Technical Field
The invention relates to a preparation method of a super-hydrophobic surface, in particular to a simple preparation method of a magnetic-responsive super-hydrophobic surface.
Background
In recent years, the super-hydrophobic property of lotus leaves with the most representativeness gradually enters the visual field of researchers, people have conducted extensive research on the characteristic of the lotus leaves that the lotus leaves are 'stained but not sludged', and researches have shown that the lotus leaves have the self-cleaning effect mainly because the micro-nano composite structure on the surface of the lotus leaves reduces the contact area between liquid drops and the surface, so that the liquid drops are prevented from infiltrating the surface, and the surface shows the super-hydrophobic property.
With the continuous development of bionics, more and more materials with super-hydrophobic properties have wide application in production and life. For example, the superhydrophobic material can be applied to the anti-icing aspect, and the surface is enabled to be 'non-water' due to the hydrophobic property of the surface, so that the surface is not frozen; in the field of microfluidics, the transportation of liquid drops can be carried out through the conversion of the hydrophilic and hydrophobic properties of materials; in the aspect of medical materials, the adhesion of cells and blood proteins can be controlled through the conversion of the hydrophilic and hydrophobic properties of the materials.
The traditional method for preparing the surface of the superhydrophobic material generally reduces the surface energy by processing and constructing surface microstructures on different materials and chemical treatment, and with the gradual maturity of precision manufacturing technology, electrochemical technology and photoetching technology, the method for processing the microstructures on the traditional materials to form the superhydrophobic surface is widely developed and applied, but the process methods not only need to consider the size, the shape and the like of the surface microstructures, but also need to select a proper chemical treatment method to reduce the surface energy of the material, and need a plurality of special expensive processing equipment and processes, so that the manufacturing cost is high.
Compared with the traditional process method, the combination of the polymer material and the micro-nano particles shows new excellent performance at present, the material with the physical property changing along with the change of the magnetic field belongs to a class of special intelligent responsive materials, and the material receives more and more attention due to the convenience, robustness, instantaneous responsiveness and remote controllability of a magnetic response switch. The magnetic field controllable soft material comprises ferrofluid, magnetorheological fluid and magnetic gel elastomer. The ferrofluid and the magnetorheological fluid belong to the category of fluid and are easy to flow, so the applicability in the aspect of hydrophilic-hydrophobic property conversion application of the super-hydrophobic surface is low; the magnetic gel elastomer is a novel composite material, consists of a high-elasticity polymer matrix and micro-nano magnetic particles dispersed in the high-elasticity polymer matrix, can quickly change physical properties through a magnetic field switch, is a trend and hot spot of future technical development on the surface of a super-hydrophobic material, and is provided in view of the above.
Disclosure of Invention
Aiming at the defects of high preparation cost, low applicability and the like in the prior art, the invention aims to provide the preparation method of the magnetic-responsiveness super-hydrophobic surface, which has low cost, simple process, strong applicability and good output performance.
In order to achieve the above object, the present invention provides a simple method for preparing a magnetically responsive superhydrophobic surface, comprising the steps of:
step one, respectively measuring a PDMS prepolymer and a curing agent by using a balance, mixing according to a mass ratio of 10:1, measuring organic solvent silicone oil by using a measuring cylinder, pouring into a beaker, mixing, and uniformly stirring by using a glass rod;
step two, weighing Fe powder with the particle diameter of 1-10 microns by using a balance, pouring the Fe powder into a beaker, and continuously and violently stirring the Fe powder for more than 5min by using a glass rod until the Fe powder is stirred into a uniform black mixed solution, so that the Fe particles are uniformly distributed in the mixed solution;
and step three, placing the glass sheet substrate on a neodymium magnet, and uniformly spraying the mixed solution prepared in the step two onto the glass substrate by using a spray gun. Under the action of a magnetic field, the Fe particles are arranged in the uncured PDMS mixture along the magnetic field spontaneously to form a micron-scale columnar array microstructure on the substrate;
and step four, putting the neodymium magnet and the glass substrate on the neodymium magnet in the step three into a drying oven for heating and curing, wherein the heating temperature is 60 ℃, and the heating time is 12 hours, so that the organic solvent silicone oil is volatilized, and the PDMS is cured to form a PDMS/iron particle composite columnar array microstructure, and finally the magnetic-responsiveness super-hydrophobic surface is obtained.
Preferably, in the first step, the amount of the PDMS prepolymer is 5-25 g.
Preferably, in the step one, the preparation amount of the silicone oil is 10-50 mL.
Preferably, in the second step, the preparation amount of the Fe particles is 5-25 g.
Furthermore, according to the simple preparation method of the magnetic-responsiveness super-hydrophobic surface, the proportion of the PDMS prepolymer, the silicone oil and the Fe particles in the first step and the second step is changed, so that the super-hydrophobic surfaces with different surface appearances are obtained.
Preferably, in the third step, the spraying distance is 5-15 cm.
Preferably, in the third step, the spraying amount is 0.5-2.5 mL.
Furthermore, the simple preparation method of the magnetic-responsiveness super-hydrophobic surface of the invention obtains the super-hydrophobic surfaces with different surface morphologies by changing the spraying amount and the spraying distance of the mixed solution sprayed in the third step.
The invention has the following beneficial effects:
(1) the magnetic-responsiveness super-hydrophobic surface disclosed by the invention not only has reliable wettability and adhesive force conversion capability, but also has instant responsiveness and remote control capability, and the regulation and control process can be completed only by using a magnet.
(2) The preparation method of the magnetic-responsiveness super-hydrophobic surface is simple in process, can be prepared only by simple manual operation and cheap equipment, avoids using high equipment, consumables and technologies, and greatly reduces the cost.
(3) According to the preparation method of the magnetic-response super-hydrophobic surface, the adopted preparation materials are all non-toxic and harmless materials, and are easy to purchase, high in applicability and strong in operability.
(4) The magnetic-responsiveness super-hydrophobic surface with the unnecessary morphology and properties can be obtained by changing one or more variables of the spraying amount, the spraying distance, the PDMS prepolymer, the silicone oil and the Fe particles.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1: the invention relates to a process flow chart of the preparation of a magnetic-responsiveness super-hydrophobic surface;
FIG. 2: the invention reversibly switches the principle diagram of the performance of the magnetic-responsiveness super-hydrophobic surface through the on/off switching of a magnetic field;
FIG. 3: a top view of a magnetically responsive superhydrophobic surface of the invention;
FIG. 4: a side view of a magnetically responsive superhydrophobic surface of the invention;
FIG. 5: a Contact Angle (CA) diagram of the magnetically responsive superhydrophobic surface of the present invention in a magnetic field on/off state;
FIG. 6: a rolling angle (SA) diagram of the magnetically responsive superhydrophobic surface of the present invention in a magnetic field on/off state;
FIG. 7: the invention changes the spray amount parameters to obtain the micro-topography change images of different surfaces.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A simple method for preparing a magnetically responsive superhydrophobic surface according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7.
Example 1:
a simple preparation method of a magnetic-responsive super-hydrophobic surface comprises the following steps:
step one, respectively measuring 5g of PDMS prepolymer and 5g of curing agent by using a balance, mixing the PDMS prepolymer and the curing agent according to a mass ratio of 10:1, measuring 10mL of organic solvent silicone oil by using a measuring cylinder, pouring the silicone oil into a beaker for mixing, and uniformly stirring by using a glass rod.
And step two, measuring 5g of Fe powder with the particle diameter of 1-10 mu m by using a balance, pouring the Fe powder into a beaker, and continuously and violently stirring the Fe powder for more than 5min by using a glass rod until the Fe powder is stirred into a uniform black mixed solution, so that the Fe particles are uniformly distributed in the mixed solution.
And step three, placing the glass sheet substrate on a neodymium magnet, and uniformly spraying the mixed solution prepared in the step two onto the glass substrate by using a spray gun. Under the action of a magnetic field, the Fe particles are arranged in the uncured PDMS mixture along the magnetic field spontaneously, and a micron-scale columnar array microstructure is formed on the substrate. Wherein, the glass sheet substrate adopts a circular glass sheet substrate with the diameter of 20mm, and the neodymium magnet adopts a cylindrical neodymium magnet with the diameter of 20mm and the height of 30 mm; the spraying distance of the spray gun was 5cm, and the spraying amount was 0.5 mL.
And step four, putting the neodymium magnet and the glass substrate on the neodymium magnet in the step three into a drying oven for heating and curing, wherein the heating temperature is 60 ℃, and the heating time is 12 hours, so that the organic solvent Dow Corning OS-20 silicone oil is volatilized, PDMS is cured, a PDMS/iron particle composite columnar array microstructure is formed, and finally the magnetic-responsiveness super-hydrophobic surface is obtained.
Example 2:
a simple preparation method of a magnetic-responsive super-hydrophobic surface comprises the following steps:
step one, respectively measuring 25g of PDMS prepolymer and 25g of curing agent by using a balance, mixing the PDMS prepolymer and the curing agent according to a mass ratio of 10:1, measuring 50mL of organic solvent silicone oil by using a measuring cylinder, pouring the silicone oil into a beaker for mixing, and uniformly stirring by using a glass rod.
And step two, measuring 25g of Fe powder with the particle diameter of 1-10 mu m by using a balance, pouring the Fe powder into a beaker, and continuously and violently stirring the Fe powder for more than 5min by using a glass rod until the Fe powder is stirred into a uniform black mixed solution, so that the Fe particles are uniformly distributed in the mixed solution.
And step three, placing the glass sheet substrate on a neodymium magnet, and uniformly spraying the mixed solution prepared in the step two onto the glass substrate by using a spray gun. Under the action of a magnetic field, the Fe particles are spontaneously arranged in the uncured PDMS mixture along the magnetic field to form a micro-scale columnar array microstructure on the substrate. Wherein, the glass sheet substrate adopts a circular glass sheet substrate with the diameter of 20mm, and the neodymium magnet adopts a cylindrical neodymium magnet with the diameter of 20mm and the height of 30 mm; the spraying distance of the spray gun was 15cm, and the spraying amount was 2.5 mL.
And step four, putting the neodymium magnet and the glass substrate on the neodymium magnet in the step three into a drying oven for heating and curing, wherein the heating temperature is 60 ℃, and the heating time is 12 hours, so that the organic solvent Dow Corning OS-20 silicone oil is volatilized, PDMS is cured, a PDMS/iron particle composite columnar array microstructure is formed, and finally the magnetic-responsiveness super-hydrophobic surface is obtained.
Example 3:
a simple preparation method of a magnetic-responsive super-hydrophobic surface comprises the following steps:
step one, respectively measuring 10g of PDMS prepolymer and 10g of curing agent by using a balance, mixing the PDMS prepolymer and the curing agent according to a mass ratio of 10:1, measuring organic solvent silicone oil by using a measuring cylinder, selecting 30mL of silicone oil as Dow Corning OS-20 silicone oil, pouring the silicone oil into a beaker, mixing, and uniformly stirring by using a glass rod.
And step two, measuring 15g of Fe powder with the particle diameter of 1-10 mu m by using a balance, pouring the Fe powder into a beaker, and continuously and violently stirring the Fe powder for more than 5min by using a glass rod until the Fe powder is stirred into a uniform black mixed solution, so that the Fe particles are uniformly distributed in the mixed solution.
And step three, placing the glass sheet substrate on a neodymium magnet, and uniformly spraying the mixed solution prepared in the step two onto the glass substrate by using a spray gun. Under the action of a magnetic field, the Fe particles are spontaneously arranged in the uncured PDMS mixture along the magnetic field to form a micro-scale columnar array microstructure on the substrate. Wherein, the glass sheet substrate adopts a circular glass sheet substrate with the diameter of 20mm, and the neodymium magnet adopts a cylindrical neodymium magnet with the diameter of 20mm and the height of 30 mm; the spray distance of the spray gun was 10cm, and the spray amount was 1.5 mL.
And step four, putting the neodymium magnet and the glass substrate on the neodymium magnet in the step three into a drying oven for heating and curing, wherein the heating temperature is 60 ℃, and the heating time is 12 hours, so that the organic solvent Dow Corning OS-20 silicone oil is volatilized, PDMS is cured, a PDMS/iron particle composite columnar array microstructure is formed, and finally the magnetic-responsiveness super-hydrophobic surface is obtained.
Example 4:
a simple preparation method of a magnetic-response super-hydrophobic surface is provided, and the difference between the example 4 and the example 3 is that the spraying amount in the step three is 0.5 mL.
Example 5:
a simple preparation method of a magnetic-response super-hydrophobic surface is provided, wherein the difference between the example 5 and the example 3 is that the spraying amount in the step three is 1.0 mL.
Example 6:
a simple preparation method of a magnetic-response super-hydrophobic surface is provided, wherein the difference between the embodiment 6 and the embodiment 3 is that the spraying amount in the third step is 2 mL.
Example 7:
a simple preparation method of a magnetic-response super-hydrophobic surface is provided, wherein the difference between the example 7 and the example 3 is that the spraying amount in the step three is 2.5 mL.
In conclusion, the present invention can obtain a magnetically responsive superhydrophobic surface with unused topography and properties by varying a single variable, for example, the above-mentioned example 3 to example 7, i.e., by adjusting the spraying amount in the third step, a magnetically responsive superhydrophobic surface with unused topography and properties is obtained, and the change of the microscopic topography thereof is shown in fig. 7. Similarly, the magnetically-responsive superhydrophobic surface with the unused shape and property can be obtained by changing the spraying distance, the PDMS prepolymer, the silicone oil and the Fe particles in a single variable, and the magnetically-responsive superhydrophobic surface with the unused shape and property can be obtained by changing a plurality of variables in the spraying amount, the spraying distance, the PDMS prepolymer, the silicone oil and the Fe particles.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (3)
1. A simple preparation method of a magnetic-responsive super-hydrophobic surface is characterized by comprising the following steps:
step one, respectively measuring a PDMS prepolymer and a curing agent by using a balance, and mixing according to a mass ratio of 10:1, wherein the preparation amount of the PDMS prepolymer is 5-25 g; measuring organic solvent silicone oil by using a measuring cylinder, wherein the preparation amount of the silicone oil is 10-50 mL; then pouring the mixture into a beaker for mixing, and stirring the mixture evenly by using a glass rod;
step two, weighing Fe powder with the particle diameter of 1-10 mu m by using a balance, wherein the preparation amount of Fe particles is 5-25 g; pouring into a beaker, and continuously stirring for more than 5min by using a glass rod until the mixture is stirred into a uniform black mixed solution, so that the Fe particles are uniformly distributed in the mixed solution;
step three, placing the glass sheet substrate on a neodymium magnet, and uniformly spraying the mixed solution prepared in the step two onto the glass substrate by using a spray gun, wherein the spraying distance is 5-15 cm, and the spraying amount is 0.5-2.5 mL; under the action of a magnetic field, the Fe particles are arranged in the uncured PDMS mixture along the magnetic field spontaneously to form a micron-scale columnar array microstructure on the substrate;
and step four, putting the neodymium magnet and the glass substrate on the neodymium magnet in the step three into a drying oven for heating and curing, wherein the heating temperature is 60 ℃, and the heating time is 12 hours, so that the organic solvent silicone oil is volatilized, and the PDMS is cured to form a PDMS/iron particle composite columnar array microstructure, thereby obtaining the magnetic-responsiveness super-hydrophobic surface.
2. The simple preparation method of a magnetically responsive superhydrophobic surface according to claim 1, wherein the superhydrophobic surfaces with different surface morphologies are obtained by changing the ratio of the PDMS prepolymer, the silicone oil and the Fe particles in the first step and the second step.
3. The simplified method of preparing a magnetically responsive superhydrophobic surface according to claim 1, wherein the superhydrophobic surfaces having different surface morphologies are obtained by varying the spraying amount and the spraying distance of the mixed solution sprayed in the third step.
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| CN112346232B (en) * | 2020-11-02 | 2021-08-24 | 山东大学 | Portable microscope and working method thereof |
| CN113071038A (en) * | 2021-03-08 | 2021-07-06 | 常州大学 | Simple preparation method of transparent flexible super-hydrophobic film |
| CN113025051B (en) * | 2021-04-16 | 2022-06-17 | 中国石油大学(华东) | Preparation method of flexible magnetic control mushroom head surface and nonmagnetic preparation device |
| CN114226198A (en) * | 2021-11-25 | 2022-03-25 | 电子科技大学 | Preparation method of magnetic control refractive index optical film |
| CN115028873B (en) * | 2022-07-06 | 2023-01-06 | 哈尔滨工业大学 | Preparation method of degummed magnetic response super-hydrophobic microplate |
| CN116376430B (en) * | 2023-03-27 | 2024-01-30 | 清华大学 | Anti-icing coating based on oil-based magnetized microneedles, and preparation method and application thereof |
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