Preparation method and application of titanium surface polydopamine film

A technology of polydopamine film and dopamine, which is applied in the field of polydopamine film preparation, can solve the problems that polydopamine film cannot grow indefinitely, the degree of polymerization of dopamine is low, and affects the polymerization speed, etc., and achieves good hydrophilicity and anti-oxidation performance. Simple, time-saving effect

Inactive Publication Date: 2017-02-08
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the polydopamine film formed by this method cannot grow infinitely, and its maximum film thickness is about 50nm (Zangmeister R A, Morris T A, Tarlov M J.Characterization of polydopamine thinfilms deposited at short times by automation of dopamine[J]. Langmuir, 2013,29(27):8619-8628), and this chemical oxidation method has l

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  • Preparation method and application of titanium surface polydopamine film
  • Preparation method and application of titanium surface polydopamine film
  • Preparation method and application of titanium surface polydopamine film

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[0026] The invention provides a kind of preparation method of polydopamine film on titanium surface, comprising:

[0027] S1) adjusting the pH value of the dopamine solution to neutral or weakly acidic with a weak acid to obtain a reaction solution;

[0028] S2) providing a three-electrode system, using the titanium substrate as the working electrode, and making one side of the titanium substrate contact the reaction solution;

[0029] S3) Connect the three-electrode system to a voltage, and construct a polydopamine film on the surface of the titanium substrate by cyclic voltammetry.

[0030] Wherein, the present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0031] In the present invention, the dopamine solution is a dopamine solution well known to those skilled in the art, and there is no special limitation. In the present invention, it is preferably a mixed solution of dopamine and tris (Tris) bu...

Embodiment 1

[0049] 1.1 Treatment of titanium substrate:

[0050] Medical pure titanium pretreatment: The medical pure titanium sheet with a diameter of 10 mm and a thickness of 0.1 mm was ultrasonically cleaned with acetone, absolute ethanol and deionized water in an ultrasonic machine for 10 minutes; then HF (concentration 0.54 mol / L) and HNO 3 (concentration 0.29mol / L) mixed acid was prepared according to the volume ratio of 1:1 to soak the titanium sheet, and finally ultrasonically cleaned with deionized water for 5-15min, blown dry with nitrogen and placed in a desiccator for later use to obtain acid pretreated Titanium sheet (pTi).

[0051] Spraying gold on the surface of the titanium sheet: using gold as the target material, pTi is vacuumed and sputtered for 120 s, rinsed with deionized water for 3 to 5 times, blown dry with nitrogen, and placed in a desiccator for later use to obtain pTi-Au.

[0052] 1.2 Construction of polydopamine film layer on the surface of titanium sheet:

...

Embodiment 2

[0060] 2.1 The treatment of the titanium substrate is the same as 1.1 in Example 1.

[0061] 2.2 Construction of polydopamine film layer on the surface of titanium sheet:

[0062] Consistent with the steps in 1.2 in Example 1, except that the conditions used when constructing the dopamine membrane were changed to a cycle potential range of -1.0 to +1.0V; a cycle scan rate of 20mV / s; a resting time of 10s; cycle 20 times .

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Abstract

The invention provides a preparation method of a titanium surface polydopamine film, wherein the preparation method includes the steps: S1) adjusting the pH value of a dopamine solution to be faintly acid or neutral with a weak acid, to obtain a reaction solution; S2) providing a three-electrode system, taking a titanium substrate as a working electrode, and making one face of the titanium substrate contact with the reaction solution; and S3) connecting the three-electrode system with the voltage, and constructing the polydopamine film on the surface of the titanium substrate by a cyclic voltammetry method. Compared with the prior art, dopamine is polymerized and deposited on titanium surface by an electrochemical method to form a uniform and smooth polydopamine film layer which resists strong acids and strong alkalis, dopamine can be allowed to be directly subjected to redox reaction to form more stable covalent bonding, the redox process of dopamine polymerization can be effectively controlled, and the polydopamine film constructed on the titanium surface is rich in phenolic hydroxyl groups and is dense and uniform, and has the advantages of better ionic permselectivity, good hydrophilicity and good oxidation resistance.

Description

technical field [0001] The invention belongs to the technical field of polydopamine film preparation, and in particular relates to a preparation method and application of a polydopamine film on a titanium surface. Background technique [0002] Polydopamine has been widely used in the surface modification of biomedical materials due to its excellent biocompatibility. This is because the groups of polydopamine are mainly phenolic hydroxyl groups, amine groups, and imine groups, and these groups bond target molecules and functional metal ions through covalent bonds, which can further improve the surface properties of biomaterials. It is generally believed that the polymerization mechanism of polydopamine membranes is that the catechol of the monomer dopamine is easily oxidized to form a catechol structure, and then the catechol structure undergoes internal cyclization, oxidative rearrangement, and intermolecular and intramolecular rearrangement reactions. Wait. The abundant p...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08J5/18
CPCC08G73/02C08J5/18C08J2379/02
Inventor 谭帼馨代聪刘燕周蕾
Owner GUANGDONG UNIV OF TECH
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