INTERFACE MATERIAL FOR VIRTUAL REALITY INTERACTION AND PREPARATION METHOD THEREFOR

Abstract

The present disclosure relates to an interface material for virtual reality interaction and a preparation method therefor. The interface material is composed of an ionic conductive self-adhesive hydrogel and an organic solvent. The preparation method includes: (1) preparing a prepolymer solution; (2) preparing a bioelectrical sensing pregel by ultraviolet (UV) curing; and (3) preparing an interface material for virtual reality interaction by solvent extraction. The preparation method of the present disclosure is simple and cost-effective, and can be used for large-scale production. The obtained gel interface material has excellent properties such as high stability, high sensitivity, non-invasiveness, and reusability, can be used for detection of bioelectrical signals such as electromyography (EMG) signals and electroencephalography (EEG) signals, and has important application value in the field of virtual reality interaction.

Claims

1. An interface material for virtual reality interaction, wherein the interface material is a gel system, and is specifically an organohydrogel with self-adhesion.

2. The interface material for virtual reality interaction according to claim 1, wherein the organohydrogel is ion-conducting polymer.

3. The interface material for virtual reality interaction according to claim 1, wherein the interface material has a thickness capable of being adaptively regulated between 100 μm and 10 mm.

4. The interface material for virtual reality interaction according to claim 1, wherein the self-adhesion is realized by adding tannic acid to the organohydrogel.

5. The interface material for virtual reality interaction according to claim 2, wherein the ionic conductivity is realized by adding alkali metal salt to the organohydrogel.

6. The interface material for virtual reality interaction according to claim 1, wherein the interface material is capable of being reused after disinfection with 75% ethanol, and has non-invasiveness, high sensitivity, and high stability.

7. A preparation method for an interface material for virtual reality interaction, comprising: (1) preparing a prepolymer solution: dissolving a gel monomer, alkali metal salt, tannic acid, a photoinitiator 12959, and a crosslinking agent methylenebisacrylamide in an aqueous solution to prepare the prepolymer solution; (2) implementing ultraviolet (UV) curing: pouring the prepolymer solution obtained in step (1) into a mold, and conducting irradiation under a UV lamp to prepare a pregel; and (3) implementing solvent extraction: soaking the pregel obtained in step (2) in an organic solvent for solvent extraction to obtain the interface material for virtual reality interaction, an organogel.

8. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (1), the gel monomer is one or more selected from the group consisting of acrylamide, acrylic acid, sodium acrylate, and N-isopropylacrylamide.

9. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (1), the alkali metal salt is one or more selected from the group consisting of lithium chloride, sodium chloride, and potassium chloride.

10. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (1), the gel monomer has a concentration of 1-5 mol/L in the aqueous solution.

11. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (1), the alkali metal salt has a concentration of 0.1-3 mol/L in the aqueous solution.

12. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (1), the tannic acid has a concentration of 0.5-3 g/L in the aqueous solution.

13. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein the UV curing is to conduct the irradiation with the UV lamp.

14. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (2), the irradiation is conducted at a UV lamp wavelength of 305-395 nm and a power of 20-200 W for 3-60 min.

15. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein the solvent extraction is to soak the pregel in the organic solvent, and achieve organic solvent infiltration through spontaneous solvent extraction.

16. The preparation method for an interface material for virtual reality interaction according to claim 7, wherein in step (3), the organic solvent is one or more selected from the group consisting of ethylene glycol, glycerol, and dimethyl sulfoxide; and the soaking is conducted for 1-24 h.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a schematic diagram of a bioelectrical signal sensing function of an interface material for virtual reality interaction prepared by the present disclosure, including electroencephalography (EEG) signals, ECG signals, and electromyography (EMG) signals;

[0024] FIG. 2 is a schematic diagram of a preparation process of the interface material for virtual reality interaction prepared by the present disclosure;

[0025] FIG. 3 is an alternating-current (AC) impedance diagram in a frequency range of 10.sup.1-10.sup.5 Hz measured when an interface material for virtual reality interaction prepared by Example 1 is packaged between two stainless steel sheets;

[0026] FIG. 4 is an AC impedance diagram obtained by packaging the interface material for virtual reality interaction prepared by Example 1 between a stainless steel sheet and pigskin;

[0027] FIG. 5 shows adhesion viscosity of the interface material for virtual reality interaction prepared by Example 1 on stainless steel, rubber, polymethyl methacrylate (PMMA), and pigskin;

[0028] FIG. 6 shows ionic conductivity of the interface material for virtual reality interaction prepared by Example 1 in an initial state, after 24 hours of storage, and after 4 months of storage;

[0029] FIG. 7 is a comparison diagram of ECG signal detection results of the interface material for virtual reality interaction prepared by Example 1 after one time of disinfection with 75% ethanol and after 100 times of disinfection with 75% ethanol;

[0030] FIG. 8 shows EMG signal results measured by the interface material for virtual reality interaction prepared by Example 1; and

[0031] FIG. 9 is a comparison diagram of results of mouse EEG signals measured by the interface material for virtual reality interaction prepared by Example 1 and an invasive electrode.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present disclosure will be described in detail below with reference to specific examples. It should be understood that these examples are only intended to describe the present disclosure, rather than to limit the scope of the present disclosure. In addition, it should be understood that various changes and modifications may be made on the present disclosure by those skilled in the art after reading the content of the present disclosure, and these equivalent forms also fall within the scope defined by the appended claims of the present disclosure.

EXAMPLE 1

[0033] (1) At a room temperature, 2 g of acrylamide powder was weighed and placed into a 100 mL beaker. 10 mL of deionized water was added. 0.8 g of sodium chloride, 0.1 g of tannic acid, 0.005 g of methylenebisacrylamide, and 0.05 g of a photoinitiator 12959 were added in sequence. Magnetic stirring was conducted for 1 h to obtain a transparent and clear prepolymer solution.

[0034] (2) The prepolymer solution obtained in step (1) was placed under a UV lamp with a wavelength of 365 nm and a power of 45 W for 20 min to obtain a pregel.

[0035] (3) The pregel obtained in step (2) was soaked in ethylene glycol for 1 h to obtain an interface material for virtual reality interaction.

[0036] As shown in the summary in the patent, application fields of the interface material for virtual reality interaction (detection of EEG signals, ECG signals, and EMG signals) are shown in FIG. 1, and a preparation process is shown in FIG. 2. As shown in FIG. 3, the prepared interface material for virtual reality interaction has an extremely low impedance of less than 20 Ω at physiologically relevant frequencies of 10.sup.2-10.sup.5 Hz. As shown in FIG. 4, when the interface material is used for bioelectrical signal sensing, impedance at an interface between pigskin and a stainless steel sheet is only 98 Ω. FIG. 5 shows adhesion viscosity of the prepared interface material for virtual reality interaction on stainless steel, rubber, polymethyl methacrylate (PMMA), and pigskin, which are 35.2, 79.3, 47.4, and 46.9 kPa respectively. FIG. 6 shows ionic conductivity of the prepared interface material for virtual reality interaction in an initial state, after 24 hours of storage, and after 4 months of storage, which are 1.84, 1.8, and 1.74 S/m respectively. FIG. 7 shows ECG signal detection results of the prepared interface material for virtual reality interaction after one time of disinfection with 75% ethanol and after 100 times of disinfection with 75% ethanol. After 100 times of disinfection, the interface material can still obtain stable ECG signals, which shows the ECG signal detection capability and disinfectable characteristics of the interface material for virtual reality interaction. FIG. 8 shows EMG signal results measured by the prepared interface material for virtual reality interaction. The results show that when the thumb, index finger, middle finger, ring finger, and little finger are retracted in turn, the EMG signals can be measured, which shows the capability of the interface material for virtual reality interaction to detect the EMG signals. FIG. 9 is a comparison diagram of results of mouse EEG signals measured by the prepared interface material for virtual reality interaction and an invasive electrode. The results show the capability of the interface material for virtual reality interaction to detect the EEG signals, and the interface material for virtual reality interaction has the same bioelectrical detection sensitivity as the invasive electrode.

EXAMPLE 2

[0037] (1) At a room temperature, 2 g of acrylamide powder was weighed and placed into a 100 mL beaker. 10 mL of deionized water was added. 0.8 g of sodium chloride, 0.05 g of tannic acid, 0.005 g of methylenebisacrylamide, and 0.05 g of a photoinitiator 12959 were added in sequence. Magnetic stirring was conducted for 1 h to obtain a transparent and clear prepolymer solution.

[0038] (2) The prepolymer solution obtained in step (1) was placed under a UV lamp with a wavelength of 365 nm and a power of 40 W for 30 min to obtain a pregel.

[0039] (3) The pregel obtained in step (2) was soaked in ethylene glycol for 1 h to obtain a disinfectable and high-sensitivity interface material for virtual reality interaction.

[0040] The appearance and material properties of the interface material for virtual reality interaction obtained in Example 2 were similar to those in Example 1. However, compared with Example 1, due to the decrease in the amount of tannic acid used, the viscosity of the interface material for virtual reality interaction was reduced to a certain extent. In addition, due to the decrease in the power of the UV lamp used, the illumination time needed to be appropriately extended, but the detection capability of the EEG signals, ECG signals, and EMG signals remained unchanged, and the disinfectable characteristics and the high-sensitivity bioelectrical signal detection characteristics remained unchanged.

EXAMPLE 3

[0041] (1) At a room temperature, 2 g of acrylic liquid was weighed and placed into a 100 mL beaker. 10 mL of deionized water was added. 0.8 g of sodium chloride, 0.1 g of tannic acid, 0.005 g of methylenebisacrylamide, and 0.05 g of a photoinitiator 12959 were added in sequence. Magnetic stirring was conducted for 1 h to obtain a transparent and clear prepolymer solution.

[0042] (2) The prepolymer solution obtained in step (1) was placed under a UV lamp with a wavelength of 365 nm and a power of 45 W for 20 min to obtain a pregel.

[0043] (3) The pregel obtained in step (2) was soaked in ethylene glycol for 1 h to obtain a disinfectable and high-sensitivity interface material for virtual reality interaction.

[0044] The appearance and material properties of the interface material for virtual reality interaction obtained in Example 3 were similar to those in Example 1. However, compared with Example 1, the mechanical properties of the interface material for virtual reality interaction decreased due to the change of monomer from acrylamide to acrylic acid, but the detection capability of the EEG signals, ECG signals, and EMG signals remained unchanged, and the disinfectable characteristics and the high-sensitivity bioelectrical signal detection characteristics remained unchanged.