CN112268780B - Preparation method of artificial leaves capable of switching liquid drop movement mode - Google Patents
Preparation method of artificial leaves capable of switching liquid drop movement mode Download PDFInfo
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- CN112268780B CN112268780B CN202011165970.9A CN202011165970A CN112268780B CN 112268780 B CN112268780 B CN 112268780B CN 202011165970 A CN202011165970 A CN 202011165970A CN 112268780 B CN112268780 B CN 112268780B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- A—HUMAN NECESSITIES
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- A41G—ARTIFICIAL FLOWERS; WIGS; MASKS; FEATHERS
- A41G1/00—Artificial flowers, fruit, leaves, or trees; Garlands
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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Abstract
The invention relates to a preparation method of an artificial leaf capable of converting a liquid drop moving mode, which comprises the following steps: firstly, uniformly spraying a super-hydrophilic solution on the surface of the vein after cleaning, removing impurities and drying, standing and drying to obtain the modified vein; then, the modified veins are spread on the surface of a Polycaprolactone (PCL) sheet heated in water bath at the temperature of 80 ℃, and the PCL sheet is placed between two glass plates for hot pressing until the PCL sheet is cooled to room temperature, so that a sample with the veins extruded into the surface of the PCL is obtained; and finally, uniformly spraying the super-hydrophobic solution on the surface of the sample, standing and drying, and removing the leaf veins to obtain the hydrophilic-hydrophobic alternate artificial leaf. The method has simple process and easily obtained raw materials, the obtained hydrophilic and hydrophobic surface can transport liquid drops in one direction and in multiple directions, and the two modes can be freely converted by the positive placement and the negative placement of the blades, so that the water collection efficiency is improved. Is suitable for industrial preparation and application.
Description
Technical Field
The invention relates to the technical field of preparation of materials for collecting water and directionally conveying water, in particular to a preparation method of an artificial leaf capable of converting a liquid drop moving mode.
Background
Inspired by the water collection of arbors, many researchers have focused their attention on the study of the structure of trees or leaves. Many surfaces for manipulating droplets rely on external energy, including magnetic fields, electric fields, chemical reactions, etc., which limits the range of applications of these methods, and methods have emerged to create energy and laplace force gradients by creating patterns on the surface to spontaneously directionally transport droplets. In addition to this, such surfaces are generally used only for unidirectional transport of droplets, and multidirectional transport of droplets is rarely studied, especially for surfaces used for both unidirectional and multidirectional transport of droplets. And surfaces for multidirectional transport are generally complex to prepare.
Disclosure of Invention
The invention aims to solve the technical problem of providing a simple, convenient and easy-to-industrialize preparation method of the artificial tree leaves capable of converting the liquid drop movement mode.
In order to solve the above problems, the invention provides a method for preparing an artificial leaf capable of converting a liquid drop movement mode, which is characterized in that: firstly, the super-hydrophilic solution is added according to the proportion of 0.01 to 0.1g/cm2Uniformly spraying the coating on the surface of the vein after cleaning, removing impurities and drying, and standing and drying for 5-20 min to obtain the modified vein; then, the modified veins are spread on the surface of a Polycaprolactone (PCL) sheet heated in water bath at the temperature of 80 ℃, and the PCL sheet is placed between two glass plates for hot pressing until the PCL sheet is cooled to room temperature, so that a sample with the veins extruded into the surface of the PCL is obtained; finally, the super-hydrophobic solution is added according to the proportion of 0.01-0.1 g/cm2And (3) uniformly spraying the mixture on the surface of the sample, standing and drying for 5-20 min, and removing the leaf veins to obtain the hydrophilic-hydrophobic alternate artificial leaf.
The vein refers to one of rubber tree leaf, magnolia leaf and linden leaf.
The super-hydrophilic solution is prepared by mixing nano silicon dioxide and absolute ethyl alcohol according to the proportion of 1; 20 is prepared by uniformly dispersing.
The load of hot pressing is 8-12 kg.
The super-hydrophobic solution is prepared by adding nano titanium dioxide into absolute ethyl alcohol, uniformly stirring, adding perfluorooctyl trichlorosilane, and stirring for 20 minutes; the mass volume ratio of the nano titanium dioxide to the absolute ethyl alcohol is 1; 20; the volume ratio of the perfluorooctyl trichlorosilane to the absolute ethyl alcohol is 3: 1000.
the spraying pressure is 0.2 MPa.
Compared with the prior art, the invention has the following advantages:
1. the invention uses the Polycaprolactone (PCL) with low price, environmental protection and excellent mechanical property as a substrate, thereby enlarging the application range.
2. According to the invention, through the adhesion of PCL to the super-hydrophilic nanoparticles and the utilization of the lower melting point of PCL, the micro-three-dimensional repeated engraving and selective hydrophilic modification of vein lines on PCL are realized, so that the directional transportation of water drops is realized only through the structural gradient and Laplace force gradient caused by patterns.
3. The preparation method has the advantages of simple preparation process and simple and easily obtained reaction raw materials.
4. The hydrophilic-hydrophobic alternate surface prepared by the spraying method is suitable for industrial preparation and application.
5. The surface of the prepared hydrophilic and hydrophobic artificial leaves enhances the process of mist capture and mist discharge, thereby enhancing the collection efficiency of the mist.
6. The hydrophilic and hydrophobic alternate bionic leaves prepared by the invention not only have the function of one-way water drop transportation, but also can realize the function of water drop pumping when the bionic leaves are placed upside down, namely, the multi-way transportation of the water drops is realized. Meanwhile, the bionic leaves are just placed and inverted by rotating the sample, so that the functions of unidirectional transportation and multidirectional transportation of water drops can be converted.
7. A comparison experiment is carried out on the sample prepared by the method disclosed by the invention, and the performance is good.
The original PCL surface was used as a sample pristine, the PCL surface sprayed with a superhydrophilic solution was used as a superhydrophilic sample, the PCL surface sprayed with a superhydrophobic solution was used as a superhydrophobic sample, the PCL surface imprinted with only vein lines was used as a sample ALWW, the PCL surface imprinted with vein lines and simultaneously modified to be superhydrophobic was used as a sample SHBAL, and the hydrophilic-hydrophobic alternated PCL surface imprinted with vein lines was prepared as a sample AL according to the procedure in example 1 (as shown in fig. 2). Wherein: pristine refers to the original sample, AL refers to artificial foliage, WW refers to no specific wettability, and SHB refers to superhydrophobicity.
[ wettability test ] in an atmosphere at room temperature, 10. mu.L of deionized water was dropped on the surface of the sample, and the contact angles and the rolling angles of the surfaces of the original sample, the superhydrophilic sample, and the superhydrophobic sample were measured, respectively. As shown in fig. 3, in which the contact angle of the original sample is about 79 °, a normal wettability is exhibited; the contact angle of the super-hydrophilic sample is about 19 degrees, and the super-hydrophilic property of the surface is proved; the contact angle of the super-hydrophobic sample is about 150 degrees, the rolling angle is about 6 degrees, and good super-hydrophobic performance is shown.
The melting point test and the tensile stress test show that the melting point of the original PCL is about 64.5 ° and the decomposition temperature is about 338 ° as shown in fig. 4, which indicates that the PCL can be melted without decomposition by heating in a water bath at 80 ℃; the tensile curve of the sample is observed, and the original PCL is elongated to 549% under 20.9MPa to be broken, which shows the good mechanical property of the sample.
[ Directional transportation Water and transportation Rate test ] the rubber, magnolia, linden AL sample prepared in example 1 is inclined by 60 degrees, water drops are dropped on different positions on the surface of the sample, the standing for a period of time finds that the water drops at the original position disappear, the water drops continuously appear and drop at the bottom of the main vein, and the prepared artificial tree leaf is proved to have excellent directional transportation effect
On the surface of the sample of rubber, magnolia, linden AL prepared in example 1, a drop of dyed water was dropped, and the diffusion process and the transport route thereof were observed. The surface of the rubber AL sample having a regular hierarchical structure as shown in fig. 5(a) and (b) is transported mainly from the slight veins to the side veins, and finally diffused to the main veins. However, the water drops on the surfaces of the magnolia and linden AL samples with the network structures are diffused in all directions, and the directional transportation effect is slightly poor.
1 μ L of water droplets were dropped on different positions on the surface of the sample using the rubber prepared in example 1, Yulan and Bodhi AL, and the distance of water droplet diffusion was observed at different positions of the sample. The distance of the pulse is the distance of the pulse spreading to the lateral pulse. As shown in fig. 5(c), the spreading distance of the rubber leaves is longest in combination.
A10. mu.L drop was applied to the surface of a sample prepared in example 1, using the rubber, Yulan and Tilia AL, and the progress and speed of the change in contact angle were observed. As shown in fig. 5(e) and (d), the water droplet on the surface of the rubber AL sample collapsed most rapidly, and the contact angle varied most rapidly.
Thus, the above tests show that: the sample prepared using example 1 had good directional transport properties, with the rubber AL sample being the most effective.
[ Water Collection test ] the pristine, ALWW, SHBAL and the rubber AL prepared in example 1 were cut into rhombuses and placed vertically, so as to avoid the influence of cutting on vein lines and facilitate the calculation of sample area. In addition to measuring the total amount of water collected by the sample, a container was placed under the center of the sample to characterize the directional transport capacity of the different samples by the amount of water collected at the center. In the device, the mist output of the humidifier is 1800 mL/h, and the mist output speed is 0.9 m/s. The test results show that the sample prepared in example 1 has both good water collection efficiency and directional transport effect (as shown in fig. 6).
The rubber, magnolia and linden AL samples prepared in example 1 were inverted and tilted by 60 °, and water droplets were dropped on different positions of the lateral vein on the surface, and it was observed that the original water droplets disappeared, appeared at the bottom of the main vein, and dropped (as shown in fig. 7 a). This phenomenon indicates that the ability to directionally transport the artificial blade upside down is still present.
The rubber, magnolia and linden AL samples prepared in example 1 were placed upside down and tilted 60 °, and the dyed water droplets were dropped onto the side veins on the surface, and the water droplets were found to move up the side veins, reach the junction between the side veins and the main vein, and then flow down the main vein (as shown in fig. 7 b). The result shows that the AL sample can pump the water drops upwards when being placed upside down and finally transport the water drops to the bottom of the main vein, and the path represents the multidirectional transport capacity of the sample.
The rubber, magnolia and linden AL samples prepared in example 1 were placed upside down and inclined at 60 °, 5 μ L of water droplets were dropped with a microsyringe at a side vein 2.8 cm from the main vein, and the time at which the water droplets disappeared was measured to reflect the speed at which the water droplets were pumped. Figure 7(d) shows that the rubber AL sample pumps the water droplets most rapidly.
Thus, the above tests show that: the AL sample prepared using example 1 had good pumping droplet characteristics, with the rubber AL sample being the most effective.
[ dyeing and processing Properties test ] dyes of different colors were added to the water heated in the water bath in example 1, and cut. Samples of different shapes and colors were successfully prepared (see fig. c)1 ~ c3Shown), the good processability and easy colorability of the sample are reflected.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a preparation process of the present invention.
FIG. 2 shows different leaf veins and prepared samples of example 1 of the invention. (a) - (d) leaves of rubberous tree; (e) - (g) linden leaves; (i) - (l) Magnolia leaf
Fig. 3 shows the contact angle (c) and the rolling angle (d) of a water drop in air on the original PCL sample (a), the superhydrophilic sample (b), and the superhydrophobic sample.
FIG. 4 shows the Differential Scanning Calorimetry (DSC) thermograms (a-b), thermogravimetric analysis (TG) spectra (c) and tensile curves (d) of the original PCL, from which the melting point, decomposition temperature and mechanical properties of the PCL can be seen.
FIG. 5 is a trace (a-b) of droplet spread on different artificial blades; the spreading distance (c) of water drops at different positions on different artificial blades; the process and speed (d-e) of collapse of water droplets on the veins of the different artificial leaves.
FIG. 6 is a view of the water collection device (a); water collection efficiency (b) for different samples; water collection efficiency (c) at different locations for different samples; and (d-f) mist water capture and removal process.
FIG. 7 shows the pumping effect (a), the process (b) and the water droplet disappearance time (d) of different samples prepared in example 1 of the present invention; white leaves (c) after coloring and cutting1) Blue heart shape (c)2) And pink Star AL sample (c)3)。
Detailed Description
Embodiment 1 a method for preparing an artificial leaf capable of switching a droplet moving mode, as shown in fig. 1:
firstly, the super-hydrophilic solution is pressed according to 0.01 g/cm under the condition that the pressure is 0.2 MPa2Uniformly spraying on the surface of the vein after cleaning, removing impurities and drying, standing and drying for 5 min to obtain the modified vein.
Then, the modified veins are spread on the surface of a Polycaprolactone (PCL) sheet heated by water bath at 80 ℃, and the PCL sheet is placed between two glass plates for hot pressing, wherein the load of the hot pressing is 10 kg. Until the whole device is cooled to room temperature, and a sample with the veins extruded into the surface of the polycaprolactone is obtained.
Finally, the super-hydrophobic solution is pressed to 0.01 g/cm under the condition that the pressure is 0.2 MPa2Uniformly spraying on the surface of the sample, standing and drying for 5 min. The nano particles on the surface of the vein are attached to the surface of the polycaprolactone sheet, and the super-hydrophobic particles are sprayed on the gaps which do not cover the vein lines, so that the artificial leaves with hydrophilic and hydrophobic phases can be obtained by removing the vein.
Embodiment 2 a method for preparing an artificial leaf capable of switching a droplet moving mode, as shown in fig. 1:
firstly, the super-hydrophilic solution is pressed at 0.04 g/cm under the condition that the pressure is 0.2 MPa2Uniformly spraying on the surface of the vein after cleaning, removing impurities and drying, standing and drying for 10 min to obtain the modified vein.
Then, the modified veins are spread on the surface of a Polycaprolactone (PCL) sheet heated in a water bath at 80 ℃, and the PCL sheet is placed between two glass plates for hot pressing, wherein the load of the hot pressing is 8 kg. Until the whole device is cooled to room temperature, and a sample with the veins extruded into the surface of the polycaprolactone is obtained.
Finally, the super-hydrophobic solution is pressed to 0.03 g/cm under the condition that the pressure is 0.2 MPa2Uniformly spraying on the surface of the sample, standing and drying for 10 min. The nano particles on the surface of the vein are attached to the surface of the polycaprolactone sheet, and the super-hydrophobic particles are sprayed on the gaps which do not cover the vein lines, so that the artificial leaves with hydrophilic and hydrophobic phases can be obtained by removing the vein.
Embodiment 3 a method for preparing an artificial leaf capable of switching a droplet moving mode, as shown in fig. 1:
firstly, the super-hydrophilic solution is pressed according to 0.1g/cm under the condition that the pressure is 0.2 MPa2Uniformly spraying on the surface of the vein after cleaning, removing impurities and drying, standing and drying for 20 min to obtain the modified vein.
Then, the modified veins are spread on the surface of a Polycaprolactone (PCL) sheet heated by water bath at 80 ℃, and the PCL sheet is placed between two glass plates for hot pressing, wherein the load of the hot pressing is 12 kg. Until the whole device is cooled to room temperature, and a sample with the veins extruded into the surface of the polycaprolactone is obtained.
Finally, dissolving the super-hydrophobicThe liquid is pressed at 0.1g/cm under the condition that the pressure is 0.2 MPa2Uniformly spraying on the surface of the sample, standing and drying for 20 min. The nano particles on the surface of the vein are attached to the surface of the polycaprolactone sheet, and the super-hydrophobic particles are sprayed on the gaps which do not cover the vein lines, so that the artificial leaves with hydrophilic and hydrophobic phases can be obtained by removing the vein.
In the above examples 1 to 3: the vein refers to one of the leaves of rubus, magnolia and linden.
The super-hydrophilic solution is prepared by uniformly dispersing 1g of nano silicon dioxide and 20mL of absolute ethyl alcohol.
The super-hydrophobic solution is prepared by adding 0.5 g of nano titanium dioxide into 10mL of absolute ethanol, uniformly stirring, adding 30 mu L of perfluorooctyl trichlorosilane, and stirring for 20 minutes. At the moment, the perfluorooctyl trichlorosilane and the titanium dioxide generate self-assembly, and the fluorine element is modified on the nano particles, so that the surface energy is reduced.
Claims (4)
1. A preparation method of artificial leaves capable of converting a liquid drop moving mode is characterized by comprising the following steps: firstly, the super-hydrophilic solution is added according to the proportion of 0.01 to 0.1g/cm2Uniformly spraying the coating on the surface of the vein after cleaning, removing impurities and drying, and standing and drying for 5-20 min to obtain the modified vein; then, the modified veins are laid on the surface of a polycaprolactone sheet heated by water bath at 80 ℃, and are placed between two glass plates for hot pressing until the temperature is cooled to room temperature, and a sample with the veins extruded into the surface of the polycaprolactone is obtained; finally, the super-hydrophobic solution is added according to the proportion of 0.01-0.1 g/cm2Uniformly spraying the mixture on the surface of the sample, standing and drying for 5-20 min, and removing the leaf veins to obtain hydrophilic-hydrophobic alternate artificial leaves; the super-hydrophilic solution is prepared by mixing nano silicon dioxide and absolute ethyl alcohol according to the weight ratio of 1: 20 is prepared by dispersing uniformly according to the mass-volume ratio; the super-hydrophobic solution is prepared by adding nano titanium dioxide into absolute ethyl alcohol, uniformly stirring, adding perfluorooctyl trichlorosilane, and stirring for 20 minutes; the mass volume ratio of the nano titanium dioxide to the absolute ethyl alcohol is 1: 20; the volume ratio of the perfluorooctyl trichlorosilane to the absolute ethyl alcohol is 3: 1000.
2. the method for preparing the artificial tree leaves capable of switching the liquid drop movement mode according to claim 1, wherein the method comprises the following steps: the vein refers to one of rubber tree leaf, magnolia leaf and linden leaf.
3. The method for preparing the artificial tree leaves capable of switching the liquid drop movement mode according to claim 1, wherein the method comprises the following steps: the load of hot pressing is 8-12 kg.
4. The method for preparing the artificial tree leaves capable of switching the liquid drop movement mode according to claim 1, wherein the method comprises the following steps: the spraying pressure is 0.2 MPa.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2465521Y (en) * | 2001-02-13 | 2001-12-19 | 钟莹素 | Artificial tree leaf structure |
| GB2483299A (en) * | 2010-09-06 | 2012-03-07 | Meika Ltd | An artificial-plant water feature with water dripping from the leaves like rain |
| CN105566666A (en) * | 2014-10-13 | 2016-05-11 | 大连理工大学 | Method for realizing liquid drop directional transportation on super-hydrophobic substrate |
| CN108816702A (en) * | 2018-06-28 | 2018-11-16 | 清华大学 | A kind of driving catchment surface and preparation method certainly with super thin-super hydrophilic structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8795834B2 (en) * | 2009-02-09 | 2014-08-05 | Sapturf, Llc | Synthetic turf having cooling layer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2465521Y (en) * | 2001-02-13 | 2001-12-19 | 钟莹素 | Artificial tree leaf structure |
| GB2483299A (en) * | 2010-09-06 | 2012-03-07 | Meika Ltd | An artificial-plant water feature with water dripping from the leaves like rain |
| CN105566666A (en) * | 2014-10-13 | 2016-05-11 | 大连理工大学 | Method for realizing liquid drop directional transportation on super-hydrophobic substrate |
| CN108816702A (en) * | 2018-06-28 | 2018-11-16 | 清华大学 | A kind of driving catchment surface and preparation method certainly with super thin-super hydrophilic structure |
Non-Patent Citations (1)
| Title |
|---|
| 仿生超疏水性表面的最新应用研究;陈钰等;《化学进展》;20120531;第24卷(第5期);第696-708页 * |
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