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CN-121991284-A - Conductive and adhesive photonic crystal hydrogel based on non-dense colloid array and preparation method and application thereof

CN121991284ACN 121991284 ACN121991284 ACN 121991284ACN-121991284-A

Abstract

The invention discloses a conductive and adhesive photonic crystal hydrogel based on a non-dense colloid array, and a preparation method and application thereof. According to the method, firstly, acrylamide, acrylated base and N, N' -methylene bisacrylamide are dissolved in water to form a mixed solution, then a photoinitiator is added to obtain a hydrogel pregel solution, then a non-dense colloid array photonic crystal, an MXene dispersion liquid and ion exchange resin are added, and the obtained hydrogel pregel with structural color is subjected to ultraviolet curing polymerization to obtain the conductive and adhesive photonic crystal hydrogel based on the non-dense colloid array. The hydrogel disclosed by the invention has excellent toughness, conductivity, adhesiveness and photoresponsivity, can be used as an electrode of a capacitor, sensitively and efficiently shows photoelectric and electric bimodal response to stretching deformation and pressure deformation, and has application prospects in the fields of electronic skin, wearable equipment, human-computer interaction and the like.

Inventors

  • FU FANFAN
  • LIU CHANGYI
  • ZHAO QINGYU
  • CAO YUCHENG

Assignees

  • 南京理工大学

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. The preparation method of the conductive and adhesive photonic crystal hydrogel based on the non-dense colloid array is characterized by comprising the following steps: (1) Dissolving acrylamide, acrylated adenine, acrylated thymine and N, N ' -methylene bisacrylamide in water to form a mixed solution, or dissolving acrylamide, acrylated guanine, acrylated cytosine and N, N ' -methylene bisacrylamide in water to form a mixed solution, and then adding a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone to obtain a hydrogel pregel solution, wherein the mass concentration of acrylamide is 17.7 wt% -19.5 wt%, the mass concentration of acrylated adenine, acrylated thymine, acrylated guanine or acrylated cytosine is 0.1% -0.5 wt%, and the mass concentration of N, N ' -methylene bisacrylamide is 0.3 wt%; (2) Adding a non-dense colloid array photonic crystal into the hydrogel pregel solution, then adding an MXene dispersion liquid and ion exchange resin, and uniformly mixing to obtain hydrogel pregel with structural color; (3) And (3) placing the hydrogel pregel with the structural color under ultraviolet light for curing polymerization to prepare the conductive and adhesive photonic crystal hydrogel based on the non-dense colloid array.
  2. 2. The method according to claim 1, wherein in the step (1), the volume of 2-hydroxy-2-methyl-1-phenyl-1-propanone is 1% -5% of the volume of the mixed solution.
  3. 3. The method according to claim 1, wherein in the step (1), the mass concentration of acrylamide in the mixed solution is 18.7 wt%, the mass concentration of acrylic adenine, acrylic thymine, acrylic guanine or acrylic cytosine is 0.5: 0.5 wt%, the mass concentration of N, N' -methylenebisacrylamide is 0.3: 0.3 wt%, and the volume of HMPP is 3% of the volume of the mixed solution.
  4. 4. The method according to claim 1, wherein in the step (2), the non-dense colloidal array photonic crystal is selected from silica, titania or zinc sulfide nanoparticles, and has a particle diameter of 60 to 200nm.
  5. 5. The method according to claim 1, wherein in the step (2), the concentration of the MXene dispersion is 10.6 mg/mL, the volume of the MXene dispersion is 2% -4% of the volume of the hydrogel pregel solution, and the addition amount of the ion exchange resin is 20% -40% wt% of the mass of the hydrogel pregel solution.
  6. 6. The method of claim 5, wherein the MXene dispersion has a volume of 3% of the hydrogel pregel solution.
  7. 7. The method according to claim 1, wherein in the step (2), the concentration of the non-dense colloidal array photonic crystal in the hydrogel pregel solution is 0.06-0.07 g/mL.
  8. 8. The process according to claim 1, wherein in the step (2), the ion exchange resin is AG 501-X8.
  9. 9. The electrically conductive, adherent photonic crystal hydrogel based on a non-dense colloidal array prepared by the preparation method according to any one of claims 1 to 8.
  10. 10. Use of a conductive, adherent photonic crystal hydrogel based on a non-dense colloidal array according to claim 9 for the preparation of electronic skin or flexible wearable devices.

Description

Conductive and adhesive photonic crystal hydrogel based on non-dense colloid array and preparation method and application thereof Technical Field The invention belongs to the field of biological materials, and relates to a conductive and adhesive photonic crystal hydrogel based on a non-dense colloid array, and a preparation method and application thereof. Background Structural color is a widely existing color in many biological skins in nature and is the result of biological evolution. The structural color of biological skin is closely related to their lifestyle, such as shielding, communication, and other biological functions. The bionic structural color material is widely applied to various fields such as anti-counterfeiting encryption, bionic textile coloring, functional coating, cell/tissue engineering and the like. Human skin is an accurate, accurate and stable sensor that senses motion state, environmental conditions and electrophysiology. With the development of bioelectronics and artificial intelligence, electronic skin that can simulate the sensory function of human skin has been developed and is attracting more and more attention. The current emphasis of electronic skin is to convert external stimuli (such as force and environmental changes) into signals, in particular electrical signals, that are easy to read and quantify. Hydrogel-based electronic skin with mechanical strength, adaptability and biocompatibility has made dramatic progress in emerging technology areas such as man-machine interaction, soft robotics and personalized medical systems. However, the development of multifunctional electronic skin hydrogels often requires the filling of conductive particles and/or modification ([1]Ding Z,Li W,Wang W,et al.Highly Sensitive Iontronic Pressure Sensor with Side-by-Side Package Based on Alveoli and Arch Structure[J].Advanced Science,2024,11(24):2309407.;[2]Zhang Hui,Guo Jiahui,Wang Yu,et al.Stretchable and Conductive Composite Structural Color Hydrogel Films as Bionic Electronic Skins[J].Advanced Science,2021,8(20):2102156.), of the hydrogel network functional groups, which functionalization process may affect the formation of periodic microstructures of the structural color hydrogels, resulting in the destruction of periodic photonic structures and the loss of structural colors. Unlike some natural biological skin that can autonomously regulate function and color, current electronic skin systems emphasize perception and performance capabilities more. Document 3 reports a piezoelectric capacitive sensor with high sensitivity, but the parameters of the sensor can only be obtained by means of electrical detection, the required instruments are relatively heavy, the requirement for real-time monitoring is greatly limited ([3]Chen Minzhang,Wan Huixiong,Hu Yang,et al.Rationally designed cellulose hydrogel for an ultrasensitive pressure sensor[J].Materials Horizons,2023,10(10):4510-20.). on the structural color in nature, especially on the structural color capable of autonomously changing color, to a certain extent in order to transfer information, such as the skin of chameleon. The development of the electronic skin with special functions similar to biological evolution is really integrated with natural environment, and is the direction of next-generation equipment. However, it remains challenging to construct a multifunctional electronic skin with stable structural colors. Disclosure of Invention Aiming at the defects of the existing electronic skin, the invention provides a conductive and adhesive photonic crystal hydrogel based on a non-dense colloid array, and a preparation method and application thereof. The invention utilizes the synergistic effect of enhanced electrostatic repulsion and electron conductivity to endow hydrogel skin with enhanced photoelectric sensing stability and strong biological interface adhesion without sacrificing the unique periodic structure of the photonic crystal. In order to achieve the above purpose, the present invention adopts the following technical scheme: the preparation method of the conductive and adhesive photonic crystal hydrogel based on the non-dense colloid array comprises the following steps: (1) Dissolving acrylamide, acrylated adenine, acrylated thymine and N, N ' -methylene bisacrylamide in water to form a mixed solution, or dissolving acrylamide, acrylated guanine, acrylated cytosine and N, N ' -methylene bisacrylamide in water to form a mixed solution, and then adding a photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-acetone (HMPP) to obtain a hydrogel pregel solution, wherein the mass concentration of the acrylamide in the mixed solution is 17.7-19.5 wt%, the mass concentration of the acrylated adenine, acrylated thymine, acrylated guanine or acrylated cytosine is 0.1-0.5 wt%, and the mass concentration of the N, N ' -methylene bisacrylamide is 0.3wt%; (2) Adding a non-dense colloid array photonic crystal into the hydrogel pregel solution, then add