Electrostatic spinning nano-fiber film, and preparation method and finger detection method of electrostatic spinning nano-fiber film

Abstract

The invention discloses an electrostatic spinning nano-fiber film, and a preparation method and a finger detection method of the electrostatic spinning nano-fiber film. The finger detection method has the advantages of simplicity, rapidity, high sensitivity and no toxicity or harm, and dispenses with large instruments. The prepared fiber film has a wide range of practical objects, is rapid and convenient for operation, and is easy for mass production, and the raw material of the fiber film can be easily acquired. The invention mainly adopts the electrostatic spinning technology to prepare thepolymer-based dye hybridization nano-fiber film, and the film can be used for direct fingerprint extraction and rapid fingerprint display at a certain temperature. The electrostatic spinning nano-fiber film disclosed by the invention is a polymer nano-fiber film in which dyes are evenly dispersed, wherein, the mass ratio of polymer and the dyes is 2-100 to 1, and the nano-fiber diameter is uniform and ranges from 50nm to 1,000nm.

Description

technical field

[0001] The invention relates to a fibrous film, a preparation method and a method for detecting fingerprints thereof, and more specifically relates to an electrospun nanofiber film, a preparation method and a method for detecting fingerprints thereof. Background technique

[0002] Human skin consists of three parts: epidermis, dermis and subcutaneous tissue. Fingerprints are raised lines on the skin. Due to the genetic nature of people, fingerprints are unique to the human body, although everyone has them, and they are complex enough to provide sufficient features for identification. At present, fingerprint detection is still one of the most powerful evidence presented in court, and it can be used to determine the evidence of presence. In addition, fingerprints are also widely used in access control and medical testing.

[0003] Since Aubert used silver nitrate to display latent fingerprints in 1877, fingerprint detection has gradually become a professiona...

Examples

Embodiment 1

[0044] 1. Configuration of spinning solution

[0045] Weigh 0.3323g of fluorescein and dissolve in 23g of DMF / THF solvent, wherein the mass ratio of DMF to THF is 15 / 8. Then 2 g of TPU was added and stirred for several hours until completely dissolved.

[0046] 2. Electrospinning process

[0047] The spinning solution prepared above was taken for spinning, the flow rate of the spinning solution was 5mL / h, the voltage was 15kV, and the distance between the needle and the drum was 15cm. The obtained spun fiber diameter is uniform, between 200-300nm, the scanning electron microscope picture sees figure 1 . For photos of the fiber membrane see figure 2 .

[0048] 3. Fingerprint display

[0049] Fingers are directly touched on the prepared fiber film, leaving latent fingerprints that are easier to distinguish with the naked eye, and then heated with 100 degrees Celsius hot air, and the fingerprints can be clearly identified in an instant (see image 3 ). In addition, the l...

Embodiment 2

[0051] 1. Configuration of spinning solution

[0052] 1 g of fluorescein was weighed and dissolved in 23 g of DMF / THF solvent, wherein the mass ratio of DMF to THF was 15 / 8. Then 2 g of TPU was added and stirred for several hours until completely dissolved.

[0053] 2. Electrospinning process

[0054] The spinning solution prepared above was taken for spinning, the flow rate of the spinning solution was 5mL / h, the voltage was 15kV, and the distance between the needle and the drum was 15cm. The obtained spun fiber diameter is uniform, between 200-300nm, the scanning electron microscope picture sees Figure 5 .

[0055] 3. Fingerprint display

[0056] Put your fingers directly on the prepared fiber film, leaving latent fingerprints that can be distinguished by naked eyes, and then heat it with hot air at 100 degrees Celsius, and the fingerprints can be clearly identified in an instant. In addition, the latent fingerprints on the surface of quartz, glass, stainless steel, po...

Embodiment 3

[0058] 1. Configuration of spinning solution

[0059] 0.02 g of fluorescein was weighed and dissolved in 23 g of DMF / THF solvent, wherein the mass ratio of DMF to THF was 15 / 8. Then 2 g of TPU was added and stirred for several hours until completely dissolved.

[0060] 2. Electrospinning process

[0061] The spinning solution prepared above was taken for spinning, the flow rate of the spinning solution was 5mL / h, the voltage was 15kV, and the distance between the needle and the drum was 15cm. The obtained spun fiber diameter is uniform, between 200-300nm, the scanning electron microscope picture sees Image 6 .

[0062] 3. Fingerprint display

[0063] Put your fingers directly on the prepared fiber film, leaving latent fingerprints that are difficult to distinguish with the naked eye, and then heat it with hot air at 120 degrees Celsius. After 30 seconds, the fingerprints can be identified. In addition, the latent fingerprints on the surface of quartz, glass, stainless st...

technical field

[0001] The invention relates to a fibrous film, a preparation method and a method for detecting fingerprints thereof, and more specifically relates to an electrospun nanofiber film, a preparation method and a method for detecting fingerprints thereof. Background technique

[0002] Human skin consists of three parts: epidermis, dermis and subcutaneous tissue. Fingerprints are raised lines on the skin. Due to the genetic nature of people, fingerprints are unique to the human body, although everyone has them, and they are complex enough to provide sufficient features for identification. At present, fingerprint detection is still one of the most powerful evidence presented in court, and it can be used to determine the evidence of presence. In addition, fingerprints are also widely used in access control and medical testing.

[0003] Since Aubert used silver nitrate to display latent fingerprints in 1877, fingerprint detection has gradually become a professiona...

Examples

Embodiment 1

[0044] 1. Configuration of spinning solution

[0045] Weigh 0.3323g of fluorescein and dissolve in 23g of DMF / THF solvent, wherein the mass ratio of DMF to THF is 15 / 8. Then 2 g of TPU was added and stirred for several hours until completely dissolved.

[0046] 2. Electrospinning process

[0047] The spinning solution prepared above was taken for spinning, the flow rate of the spinning solution was 5mL / h, the voltage was 15kV, and the distance between the needle and the drum was 15cm. The obtained spun fiber diameter is uniform, between 200-300nm, the scanning electron microscope picture sees figure 1 . For photos of the fiber membrane see figure 2 .

[0048] 3. Fingerprint display

[0049] Fingers are directly touched on the prepared fiber film, leaving latent fingerprints that are easier to distinguish with the naked eye, and then heated with 100 degrees Celsius hot air, and the fingerprints can be clearly identified in an instant (see image 3 ). In addition, the l...

Embodiment 2

[0051] 1. Configuration of spinning solution

[0052] 1 g of fluorescein was weighed and dissolved in 23 g of DMF / THF solvent, wherein the mass ratio of DMF to THF was 15 / 8. Then 2 g of TPU was added and stirred for several hours until completely dissolved.

[0053] 2. Electrospinning process

[0054] The spinning solution prepared above was taken for spinning, the flow rate of the spinning solution was 5mL / h, the voltage was 15kV, and the distance between the needle and the drum was 15cm. The obtained spun fiber diameter is uniform, between 200-300nm, the scanning electron microscope picture sees Figure 5 .

[0055] 3. Fingerprint display

[0056] Put your fingers directly on the prepared fiber film, leaving latent fingerprints that can be distinguished by naked eyes, and then heat it with hot air at 100 degrees Celsius, and the fingerprints can be clearly identified in an instant. In addition, the latent fingerprints on the surface of quartz, glass, stainless steel, po...

Embodiment 3

[0058] 1. Configuration of spinning solution

[0059] 0.02 g of fluorescein was weighed and dissolved in 23 g of DMF / THF solvent, wherein the mass ratio of DMF to THF was 15 / 8. Then 2 g of TPU was added and stirred for several hours until completely dissolved.

[0060] 2. Electrospinning process

[0061] The spinning solution prepared above was taken for spinning, the flow rate of the spinning solution was 5mL / h, the voltage was 15kV, and the distance between the needle and the drum was 15cm. The obtained spun fiber diameter is uniform, between 200-300nm, the scanning electron microscope picture sees Image 6 .

[0062] 3. Fingerprint display

[0063] Put your fingers directly on the prepared fiber film, leaving latent fingerprints that are difficult to distinguish with the naked eye, and then heat it with hot air at 120 degrees Celsius. After 30 seconds, the fingerprints can be identified. In addition, the latent fingerprints on the surface of quartz, glass, stainless st...

Images