CN103320832B - The method of wetting property gradient surface is constructed in anodic oxidation - Google Patents
The method of wetting property gradient surface is constructed in anodic oxidation Download PDFInfo
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- CN103320832B CN103320832B CN201310254617.1A CN201310254617A CN103320832B CN 103320832 B CN103320832 B CN 103320832B CN 201310254617 A CN201310254617 A CN 201310254617A CN 103320832 B CN103320832 B CN 103320832B
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Abstract
The invention discloses a kind of method that wetting property gradient surface is constructed in anodic oxidation, belong to interfacial chemistry technical field.The present invention passes through preparation and the target sample surface treatment of electrolytic solution, DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, in anode oxidation process, the relative position of adjustment anode and negative electrode, make different positions on anode different to the distance of negative electrode, thus make target sample different positions current density different, then control strength of current and anodizing time, obtain best gradient surface.The present invention can control the size of gradient, realizes the unidirectional of drop and sprawls with self-driven.The wetting property gradient surface of one dimension wetting property gradient, two-dimentional wetting property gradient and some special shapes can be realized.Can be applicable to various carbon material matrix, Application comparison is extensive.Simple to operate, the cycle is short, and cost is low, can be used for scale operation.
Description
Technical field
The invention belongs to interfacial chemistry technical field, relate to and prepare wetting property gradient surface by anodic oxidation, prepared wetting property gradient surface can realize the unidirectional of drop and sprawl with self-driven, and can grafting responsiveness molecule on the gradient group on its surface further, realize the synergy of surface chemistry gradient and outside stimulus gradient, increase self-driven degree further.
Background technology
Research finds, gradient surface can realize the unidirectional of drop and sprawl and directed driven, has a wide range of applications in fields such as diagnostics, Microfluidics, fluid power-generation, enhancement of heat transfer.Realize surface graded mainly through surface tissue and chemical constitution at present, but many method complicated operations, time and effort consuming, workload is large and efficiency is not high, poor effect, cannot carry out at short notice preparing the product wanted on a large scale.In recent years, some documents refer to and construct wetting property gradient surface by the method for control surface roughness and chemical constitution.As (Kuang-HanChu such as Kuang-HanChu, RongXiaoandEvelynN.Wang.NatureMaterials, 2010, 9, 413-417) by projection lithography technology, corrode silicon chip by the reactive ion degree of depth and obtain columnar nanometer projection, then gold-plated, nanometer columnar protrusions is deflected because of unrelieved stress, and then obtain asymmetric nanostructure, but the method operational difficulty, be difficult to control the degree of ion erosion and the degree of deflection of nanometer columnar protrusions, also the size of uncontrollable matrix surface gradient, not there is repeatability, be difficult to extensive, high-precision production.KunihiroIchimura (KunihiroIchimura, * Sang-KeunOh, MasaruNakagawa.Science, 2000,1624) silicon chip of cleaning is put into nitrogen benzide dilute solution, make its surface uniform apply azobenzene molecule, utilize the enantiomerism of azobenzene molecule under illumination condition, realize gradient surface by intensity gradient, but the change of the thickness of azobenzene molecule coating and light intensity is all difficult to control.
Summary of the invention
For problems of the prior art, the present invention adopts anonizing to construct wetting property gradient surface at matrix surface, object is to realize constructing of matrix surface wetting property gradient surface by a kind of method simply and easily, and can control 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, target sample surface treatment:
Surface treatment is carried out to target sample, sanding and polishing, remove the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, obtains target surface:
Adopt DC current regulator power supply to carry out anodic oxidation treatment to target sample, anode is surface-treated target sample, and negative electrode is the platinum electrode of inertia.In anode oxidation process, the relative position of adjustment anode and negative electrode, makes different positions on anode different to the distance of negative electrode, thus make target sample different positions current density different, control strength of current and anodizing time again, cause degree of oxidation different, thus obtain best gradient surface.
The invention has the advantages that:
1, anonizing provided by the invention constructs the method for wetting property gradient surface, can control the size of gradient, realizing the unidirectional of drop sprawls with self-driven, and can grafting responsiveness molecule on the gradient group on its surface further, realize the synergy of surface chemistry gradient and outside stimulus gradient, increase self-driven degree further.
2, anonizing provided by the invention constructs 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 constructs the method for wetting property gradient surface, and can be applicable to various carbon material matrix, Application comparison is extensive.
4, anonizing provided by the invention constructs the method for wetting property gradient surface, simple to operate, and the cycle is short, and cost is low, can be used for scale operation.
Accompanying drawing explanation
Figure 1A is that anodic oxidation constructs side wetting property comparatively greatly, and the one dimension gradient surface device schematic diagram that opposite side wetting property is little;
Figure 1B is that side wetting property is comparatively large, 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 anodic oxidation constructs middle wetting property comparatively greatly, and the one dimension gradient surface device schematic diagram that both sides wetting property is less;
Fig. 2 B is that middle wetting property is comparatively large, and the relation of contact angle and position on the less one dimension gradient surface of both sides wetting property;
Fig. 3 A is that anodic oxidation constructs both sides wetting property comparatively greatly, and the one dimension gradient surface device schematic diagram that middle wetting property is less;
Fig. 3 B is that both sides wetting property is comparatively large, 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 schematic diagram is constructed in anodic oxidation;
Fig. 4 B is the relation of two-dimensional gradient contact angle and position on the surface.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Method of constructing wetting property gradient surface provided by the invention, realizes 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, target sample surface treatment:
Surface treatment is carried out to target sample, removes the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, object is to make different positions on anode different to the distance of negative electrode, thus makes in anode oxidation process, target sample different positions current density is different, control strength of current and anodizing time again, cause the degree of oxidation of target sample different positions different, thus obtain best gradient surface.
The surface energy of the gradient surface that the method for constructing wetting property gradient surface utilizing the present invention to propose prepares changes in gradient, can realize drop thereon unidirectional and sprawl the driving with drop.
By aforesaid method wetting property gradient surface, various different special construction can be had.And then realize various different performance requriements.Below by embodiment to the preparation method of the wetting property gradient surface of various special construction and being specifically described:
embodiment 1:
The present embodiment provides anodic oxidation to construct the method for one dimension wetting property gradient surface, and wherein target sample is carbon fiber board, and 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, target sample surface treatment:
Polished finish is carried out to carbon fiber board surface, removes the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, make 2mm bottom cathode distance anode, concrete device as shown in Figure 1A, negative electrode platinum electrode is lamellar structure, the container bottoms of electrolyte solution is close to during test, the target sample of anode is carbon fiber board, and carbon fiber board place plane orthogonal is in container bottoms, like this, anode bottom and negative electrode coplanar, therefore distance negative electrode is nearer, anode top distance negative electrode is far away, thus make in anode oxidation process, target sample lower current density is larger, top current density is less, control strength of current again to change from 0.1A to 0.5A, anodizing time is set to 0min respectively, 2min, 5min, 10min, 20min, select best gradient surface.Test-results shows, and the contact angle on the target sample surface that distance negative electrode is nearer is comparatively large, and distance is far away, and current density is relatively less, and contact angle is less.
embodiment 2:
The present embodiment provides anodic oxidation to construct the method for one dimension wetting property gradient surface, and wherein target sample is carbon fiber board, and 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, target sample surface treatment:
Polished finish is carried out to carbon fiber board surface, removes the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, make 5mm bottom cathode distance anode, concrete device as shown in Figure 1A, platinum electrode plane and carbon fiber board plane orthogonal, anode bottom distance negative electrode is nearer, top distance negative electrode is far away, thus make in anode oxidation process, target sample lower current density is larger, top current density is less, control strength of current again to change from 0.1A to 0.5A, anodizing time changes from 0min to 20min, anodic oxidation result curve as shown in Figure 1B, obtain the gradient surface of contact angle even variation within the scope of 115 ° ~ 35 °.
embodiment 3:
The present embodiment provides anodic oxidation to construct the method for one dimension wetting property gradient surface, and wherein target sample is carbon fiber board, and 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, target sample surface treatment:
Polished finish is carried out to carbon fiber board surface, removes the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, make 8mm bottom cathode distance anode, concrete device as shown in Figure 1A, object is to make anode bottom distance negative electrode nearer, top distance negative electrode is far away, thus make in anode oxidation process, target sample lower current density is larger, top current density is less, control strength of current again to change from 0.1A to 0.5A, anodizing time changes from 0min to 20min, obtain the gradient surface of fiberboard length direction even variation.
embodiment 4:
It is comparatively large that the present embodiment provides anodic oxidation to construct middle wetting property, and the method for the less one dimension wetting property gradient surface of both sides wetting property, wherein target sample is carbon fiber board, and 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, target sample surface treatment:
Polished finish is carried out to carbon fiber board surface, removes the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, make cathode surface perpendicular to anode planes, in the middle part of cathode distance anode, vertical range is about 5mm, concrete device as shown in Figure 2 A, object is to make distance negative electrode in the middle part of anode nearest, and two ends distance negative electrode farthest, thus make in anode oxidation process, in the middle part of target sample, current density is larger, two ends current density is less, control strength of current again to change from 0.1A to 0.5A, anodizing time changes from 0min to 20min, experimental result as shown in Figure 2 B, at the gradient surface that the contact angle of fibreboard surface formation from both sides to centre increases gradually, contact angle variation range is 5 ° ~ 40 °.
embodiment 5:
It is comparatively large that the present embodiment provides anodic oxidation to construct 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, and 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, target sample surface treatment:
Polished finish is carried out to carbon fiber board surface, removes the organism on its surface, then clean with deionized water rinsing, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, cathode distance anode two ends are made to be about 5mm, concrete device as shown in Figure 3A, negative electrode adopts two panels platinum electrode, lay respectively in the vertical plane at anode two ends, the closest range of each cathode plane edge and anode planes is 5mm, object is to make anode two ends distance negative electrode nearest, and middle part distance negative electrode farthest, thus make in anode oxidation process, target sample two ends current density is larger, and middle part current density is less, control strength of current again to change from 0.1A to 0.5A, anodizing time changes from 0min to 20min, experimental result as shown in Figure 3 B, the anode mid-way contact angle that current density is less is maximum reaches 40 degree, wetting property is best, the anode end positions contact angle that current density is larger is identical, all be less than 10 degree, wetting property is minimum, like this, the gradient surface increased gradually from the wetting property from centre to both sides is defined at fibreboard surface.
embodiment 6:
The present embodiment provides anodic oxidation to construct the method for two-dimentional wetting property gradient surface, and wherein target sample is circular graphitic plate, and 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, target sample surface treatment:
Plasma treatment is carried out to circular graphitic plate, removes the impurity on its surface, then clean with de-ionised water, dry stand-by.
3rd step, prepare gradient surface:
DC current regulator power supply is adopted to carry out anodic oxidation treatment to target sample, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, the cathode distance anode center of circle is made to be about 5mm, concrete device as shown in Figure 4 A, described platinum electrode is point electrode, the center of circle of point electrode distance distance circular graphitic plate is nearest, for 5mm, and peripheral distance negative electrode farthest, thus make in anode oxidation process, target sample center of circle current density is larger, and periphery current density is less, control strength of current again to change from 0.1A to 0.5A, anodizing time changes from 0min to 20min.As shown in Figure 4 B, the contact angle of the home position formation that current density is maximum is minimum, thinks that ambient radiation increases, form gradient surface from the center of circle.
Claims (2)
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; Described electrolytic solution is sodium hydroxide solution, and concentration is 0.05-0.2mol/L;
Second step, target sample surface treatment; Described target sample is carbon fiber board or graphite cake; Described surface treatment to remove after surface organic matter deionized water rinsing again for first carrying out polished finish;
3rd step, obtains target surface:
The target sample of DC current regulator power supply effects on surface process is adopted to carry out anodic oxidation treatment, anode is target sample, negative electrode is the platinum electrode of inertia, the relative position of adjustment anode and negative electrode, make different positions on anode different to the distance of negative electrode, negative electrode is 2 ~ 8mm, strength of current 0.1A ~ 0.5A to the closest range of anode, anodizing time is less than 20min, obtains the gradient surface of contact angle even variation after anodic oxidation on target sample surface; Described gradient surface wetting property even variation, in one dimension or two-dimensional gradient.
2. a wetting property gradient surface, is characterized in that: adopt preparation method according to claim 1 to obtain, described gradient surface wetting property even variation, in one dimension or two-dimensional gradient.
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| CN105063994A (en) * | 2015-08-20 | 2015-11-18 | 北京化工大学 | Surface treatment method for carbon fibers |
| 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 |
| CN106119927B (en) * | 2016-06-27 | 2018-06-08 | 北京航空航天大学 | The method that electrochemical treatments prepare anisotropy water-oil separating copper mesh |
| CN108468078B (en) * | 2018-03-15 | 2021-02-09 | 北京航空航天大学 | Preparation method and application of gradient wettability surface |
| CN112020570B (en) * | 2018-04-20 | 2023-11-28 | 柯尼卡美能达株式会社 | Transparent member and method for manufacturing transparent member |
| CN114247487B (en) * | 2021-02-05 | 2022-11-01 | 北京航空航天大学 | Liquid level controlled rotary anodic oxidation device and oxidation method |
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