CN103320832A - Method for constructing wettability gradient surface by anodization - Google Patents
Method for constructing wettability gradient surface by anodization Download PDFInfo
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- CN103320832A CN103320832A CN2013102546171A CN201310254617A CN103320832A CN 103320832 A CN103320832 A CN 103320832A CN 2013102546171 A CN2013102546171 A CN 2013102546171A CN 201310254617 A CN201310254617 A CN 201310254617A CN 103320832 A CN103320832 A CN 103320832A
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Abstract
The invention discloses a method for constructing a wettability gradient surface by anodization, belonging to the technical field of surface chemistry. An electrolyte is prepared, a target sample is subjected to surface treatment, and the target sample is subjected to anodicoxidation treatment by a direct-current stabilized-voltage stabilized-current power supply. In the anodization process, the relative positions of an anode and a cathode are adjusted, so that the distances from different positions on the anode to the cathode are different, the current densities of different positions of the target sample are different, and then the current strength and the anodicoxidation time are controlled to obtain the optimal gradient surface. By adopting the method, the magnitude of gradient can be controlled to achieve unidirectional spreading and self driving of liquid drops. One-dimension wettability gradient, two-dimension wettability gradient and certain specific forms of wettability gradient surfaces can be achieved. The method can be applied to various carbon material matrices, and is widely applied. According to the method, the operation is simple, the period is short, and the cost is low and the method can be used for large scale production.
Description
Technical field
The invention belongs to the interfacial chemistry technical field, relate to by anodic oxidation and prepare the wetting property gradient surface, prepared wetting property gradient surface can realize that the unidirectional of drop sprawl with self-driven, and further grafting responsiveness molecule on its surperficial gradient group, realize the synergy of surface chemistry gradient and outside stimulus gradient, further increase self-driven degree.
Background technology
Discover that gradient surface can realize that the unidirectional of drop sprawl and directed driven, has a wide range of applications in fields such as diagnostics, Microfluidics, fluid power-generation, enhancement of heat transfer.Mainly realize by surface tissue and chemical constitution at present surface graded, still, many method complicated operations, time and effort consuming, workload is big and efficient is not high, poor effect can't prepare the product of wanting at short notice on a large scale.In recent years, some documents have been mentioned by the method for control surface roughness and chemical constitution and have been constructed the wetting property gradient surface.As (Kuang-Han Chu such as Kuang-Han Chu, Rong Xiao and Evelyn N.Wang.Nature Materials, 2010,9,413-417) by the projection lithography technology, corrode silicon chip with the reactive ion degree of depth and obtain the columnar nanometer projection, gold-plated then, make the nanometer columnar protrusions because of unrelieved stress deflection, and then obtain asymmetric nanostructure, but this method operational difficulty, be difficult to the degree of control ion erosion and the degree of deflection of nanometer columnar protrusions, the size of uncontrollable matrix surface gradient does not have repeatability yet, is difficult to extensive, high-precision production.Kunihiro Ichimura (Kunihiro Ichimura, * Sang-Keun Oh, Masaru Nakagawa.Science, 2000,1624) silicon chip of cleaning is put into the nitrogen benzide dilute solution, make its surface evenly apply azobenzene molecule, utilize the enantiomerism of azobenzene molecule under illumination condition, realize gradient surface by intensity gradient, but the variation of the thickness of azobenzene molecule coating and light intensity all is difficult to control.
Summary of the invention
At problems of the prior art, the present invention adopts anonizing to construct the wetting property gradient surface at matrix surface, purpose is to realize constructing of matrix surface wetting property gradient surface with a kind of method simply and easily, and can controls the size of wetting property gradient.
The method of wetting property gradient surface is constructed in anodic oxidation provided by the invention, comprises the steps:
The first step, the preparation of electrolytic solution:
Preparation concentration is the sodium hydroxide solution of 0.05-0.2mol/L.
Second step, the target sample surface treatment:
Target sample is carried out surface treatment, and sanding and polishing is removed its surperficial organism, rinses well with deionized water then, dries stand-by.
In the 3rd step, obtain target surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is surface-treated target sample, and negative electrode is the platinum electrode of inertia.In the anode oxidation process, adjust the relative position of anode and negative electrode, make different positions on the anode to negative electrode apart from difference, thereby make target sample different positions current density difference, control strength of current and anodizing time again, cause the degree of oxidation difference, thereby obtain best gradient surface.
The invention has the advantages that:
1, anonizing provided by the invention is constructed the method for wetting property gradient surface, can control the size of gradient, the unidirectional of drop sprawled with self-driven in realization, and further grafting responsiveness molecule on its surperficial gradient group, realize the synergy of surface chemistry gradient and outside stimulus gradient, further increase self-driven degree.
2, anonizing provided by the invention is constructed the method for wetting property gradient surface, can realize the wetting property gradient surface of one dimension wetting property gradient, two-dimentional wetting property gradient and some special shapes.
3, anonizing provided by the invention is constructed the method for wetting property gradient surface, can be applicable to various carbon material matrixes, uses more extensive.
4, anonizing provided by the invention is constructed the method for wetting property gradient surface, and is simple to operate, and the cycle is short, and cost is low, can be used for scale operation.
Description of drawings
To construct a side wetting property bigger for anodic oxidation for Figure 1A, and the little one dimension gradient surface device synoptic diagram of opposite side wetting property;
Figure 1B is that a side wetting property is bigger, and the relation of contact angle and position on the little one dimension gradient surface of opposite side wetting property;
Fig. 2 A is that wetting property was bigger in the middle of anodic oxidation was constructed, and the less one dimension gradient surface device synoptic diagram of both sides wetting property;
Fig. 2 B is that middle wetting property is bigger, and the relation of contact angle and position on the less one dimension gradient surface of both sides wetting property;
It is bigger that Fig. 3 A is that the both sides wetting property is constructed in anodic oxidation, and the less one dimension gradient surface device synoptic diagram of middle wetting property;
Fig. 3 B is that the both sides wetting property is bigger, and the relation of contact angle and position on the less one dimension gradient surface of middle wetting property;
Fig. 4 A is that two-dimentional wetting property surface apparatus synoptic diagram is constructed in anodic oxidation;
Fig. 4 B is the relation of contact angle and position on the two-dimentional gradient surface.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Method of constructing the wetting property gradient surface provided by the invention, realize as follows:
The first step, the preparation of electrolytic solution:
Preparation concentration is that the sodium hydroxide solution of 0.05-0.2mol/L is as electrolytic solution.
Second step, the target sample surface treatment:
Target sample is carried out surface treatment, remove its surperficial organism, rinse well with deionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, purpose be for make different positions on the anode to negative electrode apart from difference, thereby make in anode oxidation process, target sample different positions current density difference, control strength of current and anodizing time again, cause the degree of oxidation difference of target sample different positions, thereby obtain best gradient surface.
The surface energy of the gradient surface that the method for constructing the wetting property gradient surface of utilizing the present invention to propose prepares changes in gradient, can realize that thereon unidirectional of drop sprawl the driving with drop.
By aforesaid method wetting property gradient surface processed, can have various special construction.And then realize various performance requriements.Below by embodiment to the preparation method of the wetting property gradient surface of various special constructions be specifically described:
Embodiment 1:
The method that present embodiment provides anodic oxidation to construct one dimension wetting property gradient surface, wherein target sample is carbon fiber board, concrete anode oxidation process comprises following step:
The first step, the preparation of electrolytic solution:
Preparation concentration is that the sodium hydroxide solution of 0.05mol/L is as electrolytic solution.
Second step, the target sample surface treatment:
Polished finish is carried out on the carbon fiber board surface, removed its surperficial organism, rinse well with deionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, make cathode distance anode bottom 2mm, specifically install shown in Figure 1A, the negative electrode platinum electrode is lamellar structure, is close to the container bottoms of electrolyte solution during test, the target sample of anode is carbon fiber board, and plane, carbon fiber board place is perpendicular to container bottoms, and like this, anode bottom and negative electrode are coplanar, therefore nearer apart from negative electrode, anode top is far away apart from negative electrode, thereby makes in anode oxidation process, and target sample bottom current density is bigger, the top current density is less, control strength of current again and change from 0.1A to 0.5A, anodizing time is set to 0min respectively, 2min, 5min, 10min, 20min selects best gradient surface.Test-results shows that the contact angle on the target sample surface nearer apart from negative electrode is bigger, and distance is more far away, and current density is relatively more little, and contact angle is more little.
Embodiment 2:
The method that present embodiment provides anodic oxidation to construct one dimension wetting property gradient surface, wherein target sample is carbon fiber board, concrete anode oxidation process comprises following step:
The first step, the preparation of electrolytic solution:
Preparation concentration is that the sodium hydroxide solution of 0.2mol/L is as electrolytic solution.
Second step, the target sample surface treatment:
Polished finish is carried out on the carbon fiber board surface, removed its surperficial organism, rinse well with deionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, make cathode distance anode bottom 5mm, specifically install shown in Figure 1A, the platinum electrode plane is vertical with the carbon fiber board plane, the anode bottom is nearer apart from negative electrode, top is far away apart from negative electrode, thereby make that in anode oxidation process target sample bottom current density is bigger, the top current density is less, controlling strength of current again changes from 0.1A to 0.5A, anodizing time changes from 0min to 20min, and the anodic oxidation result curve obtains the gradient surface of contact angle even variation in 115 °～35 ° scopes as shown in Figure 1B.
Embodiment 3:
The method that present embodiment provides anodic oxidation to construct one dimension wetting property gradient surface, wherein target sample is carbon fiber board, concrete anode oxidation process comprises following step:
The first step, the preparation of electrolytic solution:
Preparation concentration is the sodium hydroxide solution of 0.05mol/L.
Second step, the target sample surface treatment:
Polished finish is carried out on the carbon fiber board surface, removed its surperficial organism, rinse well with deionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, make cathode distance anode bottom 8mm, specifically install shown in Figure 1A, purpose is in order to make the anode bottom nearer apart from negative electrode, top is far away apart from negative electrode, thereby makes in anode oxidation process, and target sample bottom current density is bigger, the top current density is less, control strength of current again and change from 0.1A to 0.5A, anodizing time changes from 0min to 20min, obtains the gradient surface of fiberboard length direction even variation.
Embodiment 4:
Present embodiment provide anodic oxidation construct in the middle of wetting property bigger, and the method for the less one dimension wetting property gradient surface of both sides wetting property, wherein target sample is carbon fiber board, concrete anode oxidation process comprises following step:
The first step, the preparation of electrolytic solution:
Preparation concentration is the sodium hydroxide solution of 0.2mol/L.
Second step, the target sample surface treatment:
Polished finish is carried out on the carbon fiber board surface, removed its surperficial organism, rinse well with deionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, make cathode surface perpendicular to anode planes, the about 5mm of cathode distance anode middle part vertical range, specifically install shown in Fig. 2 A, purpose is in order to make the anode middle part nearest apart from negative electrode, and two ends apart from negative electrode farthest, thereby make in anode oxidation process, and target sample middle part current density is bigger, the two ends current density is less, control strength of current again and change from 0.1A to 0.5A, anodizing time changes from 0min to 20min, and experimental result is shown in Fig. 2 B, form the gradient surface that the contact angle from both sides to the centre increases gradually on the fiberboard surface, the contact angle variation range is 5 °～40 °.
Embodiment 5:
It is bigger that present embodiment provides anodic oxidation to construct the both sides wetting property, and the method for the less one dimension wetting property gradient surface of middle wetting property, wherein target sample is carbon fiber board, concrete anode oxidation process comprises following step:
The first step, the preparation of electrolytic solution:
Preparation concentration is the sodium hydroxide solution of 0.2mol/L.
Second step, the target sample surface treatment:
Polished finish is carried out on the carbon fiber board surface, removed its surperficial organism, rinse well with deionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, make the about 5mm in cathode distance anode two ends, concrete device as shown in Figure 3A, negative electrode adopts two platinum electrodes, lay respectively in the vertical plane at anode two ends, the closest range of each cathode plane edge and anode planes is 5mm, purpose is in order to make the anode two ends nearest apart from negative electrode, and the middle part apart from negative electrode farthest, thereby make in anode oxidation process, target sample two ends current density is bigger, and the middle part current density is less, controlling strength of current again changes from 0.1A to 0.5A, anodizing time changes from 0min to 20min, experimental result is shown in Fig. 3 B, the less anode mid-way contact angle maximum of current density reaches 40 degree, and wetting property is best, and the anode end positions contact angle that current density is bigger is identical, all less than 10 degree, the wetting property minimum like this, has formed the gradient surface that increases gradually from the wetting property from the centre to both sides on the fiberboard surface.
Embodiment 6:
The method that present embodiment provides anodic oxidation to construct two-dimentional wetting property gradient surface, wherein target sample is circular graphite cake, concrete anode oxidation process comprises following step:
The first step, the preparation of electrolytic solution:
Preparation concentration is the sodium hydroxide solution of 0.05mol/L.
Second step, the target sample surface treatment:
Circular graphite cake is carried out plasma treatment, remove its surperficial impurity, rinse well with ionized water then, dry stand-by.
The 3rd step, the preparation gradient surface:
Adopt dc current regulator power supply that target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, adjust the relative position of anode and negative electrode, make the about 5mm in the cathode distance anode center of circle, specifically install shown in Fig. 4 A, described platinum electrode is point electrode, and point electrode is nearest apart from the center of circle of the circular graphite cake of distance, is 5mm, and the peripheral distance negative electrode farthest, thereby make that in anode oxidation process target sample center of circle current density is bigger, and peripheral current density is less, control strength of current again and change from 0.1A to 0.5A, anodizing time changes from 0min to 20min.Shown in Fig. 4 B, the contact angle minimum that the home position of current density maximum forms thinks that from the center of circle ambient radiation increases, and forms gradient surface.
Claims (5)
1. the method for wetting property gradient surface is constructed in anodic oxidation, it is characterized in that, comprises following step:
The first step, the preparation of electrolytic solution;
Second step, the target sample surface treatment;
In the 3rd step, obtain target surface:
Adopt dc current regulator power supply that the surface-treated target sample is carried out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, negative electrode is 2～8mm to the closest range of anode, strength of current 0.1A～0.5A, anodizing time obtains the gradient surface of contact angle even variation less than 20min on the target sample surface after the anodic oxidation.
2. the method for wetting property gradient surface is constructed in anodic oxidation according to claim 1, it is characterized in that: the electrolytic solution in the first step is sodium hydroxide solution, and concentration is 0.05-0.2mol/L.
3. the method for wetting property gradient surface is constructed in anodic oxidation according to claim 1, it is characterized in that: the target sample surface treatment is that surface organic matter and deionized water rinsing are removed in polished finish in second step.
4. the method for wetting property gradient surface is constructed in anodic oxidation according to claim 1, it is characterized in that: described target sample is carbon fiber board or graphite cake.
5. wetting property gradient surface is characterized in that: adopt the described preparation method of claim 1 to obtain, described gradient surface wetting property even variation is one dimension or two-dimentional gradient.
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| CN106119927A (en) * | 2016-06-27 | 2016-11-16 | 北京航空航天大学 | Electrochemical treatments prepares the method for anisotropy oil-water separation copper mesh |
| CN108468078A (en) * | 2018-03-15 | 2018-08-31 | 北京航空航天大学 | A kind of preparation method and application on gradient wellability surface |
| CN112020570A (en) * | 2018-04-20 | 2020-12-01 | 柯尼卡美能达株式会社 | Transparent member and method for producing transparent member |
| CN114247487A (en) * | 2021-02-05 | 2022-03-29 | 北京航空航天大学 | Liquid level controlled rotary anodic oxidation device and oxidation method |
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| CN105755519A (en) * | 2016-03-03 | 2016-07-13 | 北京航空航天大学 | Method for preparing efficient air water-collecting copper surface by virtue of gradient anodic oxidation method |
| CN105755519B (en) * | 2016-03-03 | 2018-05-11 | 北京航空航天大学 | Gradient anode oxidizing process prepares highly effective air and catchments the method on copper surface |
| CN106119927A (en) * | 2016-06-27 | 2016-11-16 | 北京航空航天大学 | Electrochemical treatments prepares the method for anisotropy oil-water separation copper mesh |
| CN108468078A (en) * | 2018-03-15 | 2018-08-31 | 北京航空航天大学 | A kind of preparation method and application on gradient wellability surface |
| CN108468078B (en) * | 2018-03-15 | 2021-02-09 | 北京航空航天大学 | Preparation method and application of gradient wettability surface |
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| CN114247487A (en) * | 2021-02-05 | 2022-03-29 | 北京航空航天大学 | Liquid level controlled rotary anodic oxidation device and oxidation method |
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