PH-INDEPENDENT POLYDOPAMINE SYNTHESIS METHOD UNDER VISIBLE LIGHT

Abstract

A pH-independent synthesis method for synthesizing polydopamine, which can be carried out under visible light and/or daylight.

Claims

1. A synthesis method to synthesize polydopamine, comprising; the process step of obtaining a polydopamine by reacting a dopamine and a diphenyliodonium in the presence of at least one photo-stimulant under a visible light and/or daylight.

2. The synthesis method according to claim 1, wherein; the process step of reacting said dopamine and said diphenyliodonium in mole equal proportions.

3. The synthesis method according to claim 1, wherein; said dopamine and said diphenyliodonium reaction lasts for 2-4 hours.

Description

FIGURES CLARIFYING THE INVENTION

[0012] An example photo pattern view is given in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0013] In this detailed description, the inventive polydopamine synthesis method is described only for clarifying the subject matter in a manner such that no limiting effect is created.

[0014] The present invention relates to a synthesis method for synthesizing polydopamine. The method uses the ability of diphenyliodonium to oxidize dopamine. Accordingly, dopamine is easily oxidized to obtain polydopamine. Dopamine reacts with diphenyliodonium in the presence of at least one photostimulant under visible light and/or sunlight in the inventive method. An aromatic hydrocarbon that absorbs light in the visible region can be used as a photostimulant. Visible light and/or daylight are low-energy lights, they minimize the energy required to obtain polydopamine. The predicted photoelectron transfer mechanism is as follows:

##STR00001## [0015] Ph.sub.2I.sup.+PF.sub.6.sup.−: Iodonium salt [0016] PT: Phenothiazine photostimulant [0017] Py: Pyrene photostimulant

[0018] In a preferred embodiment of the invention, concentrated (50 mM) dopamine. HCl ethanol solution in the presence of appropriate photostimulant (0.01 eq) dopamine in a 1:1 molar ratio: It is reacted with DPI (diphenyliodonium salt) for 2 or 4 hours in a Shlenk tube under the visible light or sunlight and nitrogen atmosphere. The dark brown/black particles formed after the reaction are washed with alcohol and filtered. The filtered dark solids are preferably dried in a vacuum incubator at 50° C. for 1 day. Polydopamine formation can be achieved by using the above-mentioned components under nitrogen gas on any surface instead of a Schlenk tube, if desired, by using visible light or daylight.

[0019] Polydopamines are used for coating purposes in different fields of industry. They also allow surfaces to become bioactive in the field of biology. They are effective in increasing the protective effect of the surfaces and ensuring adhesion regardless of the surface. As a form of application, depending on the thickness desired to be coated, substrate immersed from above in the calculated polydopamine solution and different surfaces of the substrate to be coated can be coated at different times with the layer-by-layer coating method. It is also possible to make a coating (patterning) with the photomasking method.

REFERENCES

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