A kind of fingerprint-like aluminum phosphate structure and its preparation method

Abstract

The application discloses a kind of aluminum phosphate structures of fingerprint-like and preparation method thereof, it is related to aluminum phosphate material technical field, preparation method includes the following steps: S1.glass substrate is sequentially cleaned by lye, acid liquid, remove surface impurities;S2.aluminum isopropyl alcohol and phosphoric acid are used as raw material, deionized water and ethanol are used as solvent, and citric acid, ethylene glycol, polyethylene glycol are added as complexing agent, pH value is adjusted by hydrochloric acid, and aluminum phosphate coating solution is prepared;S3.glass is placed on hot plate, and the temperature of hot plate is 80-100 DEG C;Coating solution is placed on glass substrate by spraying method;S4.sample is high-temperature heat treated.The aluminum phosphate film with fingerprint-like structure is prepared on the surface of glass by simple liquid phase coating and heat treatment process, and the preparation method is simple.

Description

Technical Field

[0001] This invention relates to the field of aluminum phosphate materials technology, specifically to a glass surface functionalized or modified thin film, and more specifically, to a fingerprint-like aluminum phosphate structure and its preparation method. Background Technology

[0002] The unique, uneven structure of fingerprints increases friction when the hand touches objects, while also making the skin more easily stretched and deformed, preventing injury. Furthermore, human fingers can accurately sense minute changes in the external environment, primarily due to the pattern on the fingerprint surface and the receptors in the underlying skin. In recent years, scientists have conducted research on designing fingerprint-inspired structures, developing promising related products. For example, researchers at Anhui University developed a biomimetic stretchable strain sensor with a fingerprint pattern (Composites Part A: Applied Science and Manufacturing, 2024, 179, 108043). However, the construction of fingerprint-inspired structures using aluminum phosphate material has not yet been reported. Summary of the Invention

[0003] The purpose of this invention is to provide a fingerprint-like aluminum phosphate structure and its preparation method. The method involves preparing an aluminum phosphate thin film with a fingerprint-like structure on a glass surface through a simple liquid phase deposition and heat treatment process. The preparation method is simple.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0006] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0007] S2. Preparation of aluminum phosphate coating solution: Aluminum isopropoxide and phosphoric acid are used as raw materials, deionized water and ethanol are used as solvents, and citric acid, ethylene glycol and polyethylene glycol are added as complexing agents. The pH value is adjusted by hydrochloric acid to prepare the aluminum phosphate coating solution.

[0008] Furthermore, the amounts of aluminum isopropoxide and phosphoric acid used meet the following ratios: the molar ratio of Al to P is 1:1; the concentration of Al in the aluminum phosphate coating solution is 0.005–0.5 mol / L.

[0009] Furthermore, the volume ratio of the deionized water to ethanol is 5:1 to 5:2;

[0010] Furthermore, the amount of citric acid used satisfies the molar ratio of Al to citric acid being 1:1;

[0011] Furthermore, the amount of ethylene glycol used satisfies the molar ratio of Al to ethylene glycol being 2:1 to 5:1;

[0012] Furthermore, the amount of polyethylene glycol used satisfies the molar ratio of Al to -OH being 10:1 to 1:1.

[0013] Furthermore, the average molecular weight of the polyethylene glycol is 400-600.

[0014] S3. Place the glass on a heating plate, the temperature of which is 80-100℃; apply the coating solution to the glass substrate using a spraying method.

[0015] During this process, the ethanol in the coating solution boils when heated, which drives the micro-flow and collision of the liquid on the surface of the coating solution to form a concentric circle structure.

[0016] S4. Perform high-temperature heat treatment on the sample. The heat treatment temperature is 350-450℃, the heating rate is not less than 20℃ / min, and the holding time after reaching the target temperature is 30-60min.

[0017] Another object of the present invention is to provide a fingerprint-like aluminum phosphate structure prepared by the above preparation method, which belongs to a type of glass surface functionalized or modified film.

[0018] The beneficial effects of this invention are:

[0019] This invention provides a fingerprint-like aluminum phosphate thin film structure. Furthermore, the preparation method of this invention is very simple and easily suitable for large-scale industrial production. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is an optical photograph of Embodiment 1 of the present invention;

[0022] Figure 2 These are optical photographs of Embodiment 2 of the present invention;

[0023] Figure 3 These are optical photographs of Embodiment 3 of the present invention;

[0024] Figure 4 These are optical photographs of Embodiment 4 of the present invention;

[0025] Figure 5 These are optical photographs of Embodiment 5 of the present invention;

[0026] Figure 6 These are optical photographs of Embodiment 6 of the present invention;

[0027] Figure 7 This is an optical photograph of Embodiment 7 of the present invention. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0031] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0032] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.02 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:2. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 2:1, and an Al to polyethylene glycol -OH molar ratio of 5:1. The average molecular weight of polyethylene glycol is 400. Adjust the pH to 5 with hydrochloric acid.

[0033] S3. Place the glass on a heating plate at a temperature of 80°C. Apply the coating solution to the glass substrate using a spraying method.

[0034] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 20℃ / min, a heat treatment temperature of 350℃, and a holding time of 30min. After natural cooling to room temperature, the sample is obtained.

[0035] Example 2

[0036] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0037] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0038] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.02 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:1. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 2:1, and an Al to polyethylene glycol -OH molar ratio of 5:1. The average molecular weight of polyethylene glycol is 400. Adjust the pH to 5 with hydrochloric acid.

[0039] S3. Place the glass on a heating plate at a temperature of 90°C. Apply the coating solution to the glass substrate using a spraying method.

[0040] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 20℃ / min, a heat treatment temperature of 350℃, and a holding time of 30min. After natural cooling to room temperature, the sample is obtained.

[0041] Example 3

[0042] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0043] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0044] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.005 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:1. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 5:1, and an Al to polyethylene glycol -OH molar ratio of 10:1. The average molecular weight of polyethylene glycol is 400. Adjust the pH to 5 with hydrochloric acid.

[0045] S3. Place the glass on a heating plate at a temperature of 80°C. Apply the coating solution to the glass substrate using a spraying method.

[0046] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 20℃ / min, a heat treatment temperature of 350℃, and a holding time of 30min. After natural cooling to room temperature, the sample is obtained.

[0047] Example 4

[0048] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0049] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0050] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.02 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:2. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 2:1, and an Al to polyethylene glycol -OH molar ratio of 1:1. The average molecular weight of polyethylene glycol is 400. Adjust the pH to 5 with hydrochloric acid.

[0051] S3. Place the glass on a heating plate at a temperature of 90°C. Apply the coating solution to the glass substrate using a spraying method.

[0052] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 30℃ / min, a heat treatment temperature of 450℃, and a holding time of 30min. After natural cooling to room temperature, the sample is obtained.

[0053] Example 5

[0054] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0055] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0056] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.02 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:1. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 2:1, and an Al to polyethylene glycol -OH molar ratio of 5:1. The average molecular weight of polyethylene glycol is 400. Adjust the pH to 5 with hydrochloric acid.

[0057] S3. Place the glass on a heating plate at a temperature of 100°C. Apply the coating solution to the glass substrate using a spraying method.

[0058] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 20℃ / min, a heat treatment temperature of 450℃, and a holding time of 30min. After natural cooling to room temperature, the sample is obtained.

[0059] Example 6

[0060] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0061] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0062] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.02 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:2. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 5:1, and an Al to polyethylene glycol -OH molar ratio of 10:1. The average molecular weight of polyethylene glycol is 400. Adjust the pH to 5 with hydrochloric acid.

[0063] S3. Place the glass on a heating plate at a temperature of 80°C. Apply the coating solution to the glass substrate using a spraying method.

[0064] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 20℃ / min, a heat treatment temperature of 400℃, and a holding time of 60min. After natural cooling to room temperature, the sample is obtained.

[0065] Example 7

[0066] A method for preparing a fingerprint-like aluminum phosphate structure includes the following steps:

[0067] S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities;

[0068] S2. Preparation of aluminum phosphate coating solution. Accurately weigh aluminum isopropoxide and add it to deionized water, with an Al concentration of 0.1 mol / L, and stir. Add ethanol at a water-to-ethanol volume ratio of 5:2. Add phosphoric acid at a molar ratio of Al to P of 1:1. Then, add citric acid, ethylene glycol, and polyethylene glycol as complexing agents, with an Al to citric acid molar ratio of 1:1, an Al to ethylene glycol molar ratio of 2:1, and an Al to polyethylene glycol -OH molar ratio of 5:1. The average molecular weight of polyethylene glycol is 600. Adjust the pH to 5 with hydrochloric acid.

[0069] S3. Place the glass on a heating plate at a temperature of 80°C. Apply the coating solution to the glass substrate using a spraying method.

[0070] S4. The sample is subjected to high-temperature heat treatment at a heating rate of 20℃ / min, a heat treatment temperature of 350℃, and a holding time of 30min. After natural cooling to room temperature, the sample is obtained.

[0071] like Figures 1-7 As shown, these are optical photographs of the fingerprint-like aluminum phosphate structures obtained in Examples 1-7, respectively.

[0072] The above detailed embodiments provide a specific description of the analytical methods involved in this invention. It should be noted that the above description is only intended to help those skilled in the art better understand the methods and ideas of this invention, and is not intended to limit the scope of the invention. Without departing from the principles of this invention, those skilled in the art can make appropriate adjustments or modifications to this invention, and such adjustments and modifications should also fall within the protection scope of this invention.

Claims

1. A method for preparing a fingerprint-like aluminum phosphate structure, characterized in that, Includes the following steps: S1. The glass substrate is cleaned sequentially with alkaline solution and acid solution to remove surface impurities; S2. Preparation of aluminum phosphate coating solution: Aluminum isopropoxide and phosphoric acid are used as raw materials, deionized water and ethanol are used as solvents, and citric acid, ethylene glycol and polyethylene glycol are added as complexing agents. The pH value is adjusted by hydrochloric acid to prepare the aluminum phosphate coating solution. The amounts of aluminum isopropoxide and phosphoric acid used meet the following ratios: the molar ratio of Al to P is 1:1; the concentration of Al in the aluminum phosphate coating solution is 0.005–0.5 mol / L. The amount of citric acid used satisfies the requirement that the molar ratio of Al to citric acid is 1:1; The amount of ethylene glycol used satisfies the molar ratio of Al to ethylene glycol being 2:1 to 5:1; The amount of polyethylene glycol used satisfies the molar ratio of Al to -OH being 10:1 to 1:1; The average molecular weight of the polyethylene glycol is 400-600; S3. Place the glass on a heating plate, the temperature of which is 80-100℃; apply the coating solution to the glass substrate using a spraying method. S4. Perform high-temperature heat treatment on the sample. The heat treatment temperature is 350-450℃, the heating rate is not less than 20℃ / min, and the holding time after reaching the target temperature is 30-60min.

2. The method for preparing a fingerprint-like aluminum phosphate structure according to claim 1, characterized in that, The volume ratio of deionized water to ethanol is 5:1 to 5:

2.

3. A fingerprint-like aluminum phosphate structure, characterized in that, Prepared according to the method according to any one of claims 1-2.

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