CN-121991450-A - Design method of rare earth-polysaccharide-based multifunctional hydrogel

Abstract

The invention belongs to the technical field of high polymer materials, and discloses a design method of rare earth-polysaccharide-based multifunctional hydrogel. The hydrogel takes arabinogalactan as a matrix, and comprises the specific components of arabinogalactan, acrylamide, polyethylene glycol and nanometer copper powder, wherein the polysaccharide-based hydrogel is doped with europium ions. The hydrogel has fluorescence and conductivity double sensing channels, overcomes the disadvantage that the traditional rare earth hydrogel can only be used as a fluorescence sensor, and adopts rare earth-polysaccharide as physical crosslinking, thereby providing a stronger network and enhancing mechanical properties. Meanwhile, the hydrogel can freely adjust the mechanical property and fluorescence intensity by changing the polysaccharide content, responds to the external ion environment, and has extremely high sensing sensitivity (GF=21) and tensile property (strain=1100%). The hydrogel sensor has stable performance and convenient preparation, widens the application range of rare earth hydrogel, and has good development prospect.

Inventors

• TAN HUAPING
• BAI HAOWEN
• LIU WEI
• Yao Kunda
• WANG KEWEN
• WANG FENGYI

Assignees

• 南京理工大学

Dates

Publication Date

20260508

Application Date

20241105

Claims (5)

1. 1. The rare earth-polysaccharide based multifunctional hydrogel is characterized by comprising 82 weight percent of deionized water, 16.5 weight percent of acrylamide, 0.58 weight percent of polysaccharide, 0.82 weight percent of polyethylene glycol and 0.1 weight percent of nanometer copper powder, wherein europium ions are doped in the formed polysaccharide based hydrogel.
2. 2. The rare earth-polysaccharide based multifunctional hydrogel of claim 1, wherein the polysaccharide is arabinogalactan.
3. 3. The rare earth-polysaccharide based multifunctional hydrogel of claim 1, wherein the rare earth-polysaccharide based multifunctional hydrogel is prepared by the following steps: (1) Sequentially dissolving polyethylene glycol, polysaccharide and acrylamide serving as raw materials into deionized water, and placing the deionized water on a magnetic stirrer for fully and uniformly mixing; (2) Adding nano copper powder, and uniformly dispersing the nano copper powder in the solution by using a mixing instrument; (3) Adding a cross-linking agent N, N' -bis (acryl) cystamine, a catalyst ammonium persulfate and an initiator tetramethyl ethylenediamine, and uniformly stirring; (4) The solution is moved into a mould and is fully polymerized into glue after waiting for 5 hours; (5) Soaking the formed hydrogel into 0.1mol/L rare earth solution for 10min to obtain the rare earth-polysaccharide-based multifunctional hydrogel.
4. 4. The rare earth-polysaccharide based multifunctional hydrogel of claim 3, wherein the rare earth solution is a rare earth Eu 3+ solution.
5. 5. A design method of rare earth-polysaccharide based multifunctional hydrogel is characterized by comprising the steps of sequentially dissolving polyethylene glycol, arabinogalactan and acrylamide serving as raw materials in deionized water, placing the mixture on a magnetic stirrer for fully and uniformly mixing, then adding nano copper powder, uniformly dispersing the nano copper powder in the solution by using a uniformly mixing instrument, finally adding a cross-linking agent N, N' -bis (propionyl) cystamine, a catalyst ammonium persulfate and an initiator tetramethyl ethylenediamine, transferring the solution into a mold, waiting for 5 hours to fully polymerize the solution into gel, and finally soaking the formed hydrogel in 0.1mol/L rare earth Eu 3+ solution for 10min to ensure that Eu 3+ is uniformly distributed in the hydrogel example and Eu 3+ complex is formed, thus obtaining the rare earth-polysaccharide based multifunctional hydrogel.

Description

Design method of rare earth-polysaccharide-based multifunctional hydrogel Technical Field The invention relates to a design method of rare earth-polysaccharide-based multifunctional hydrogel, and belongs to the field of high polymer materials. Background The hydrogel is a polymer of a polymer network and water, and has obvious application value in the aspects of sensors, electronic equipment, optical equipment, tissue engineering and the like. Among them, fluorescent polymer hydrogels are attracting attention due to their good luminescence properties, and have great potential in the fields of optical display, biological imaging, and the like. The luminescent groups of fluorescent polymer hydrogels can be classified into fluorescent proteins, organic fluorophores, rare earth complexes, which are important fluorescent materials with unique metal controlled photoluminescence, and luminescent nanoparticles. They generally have high luminescence quantum yields, clear emission bands, high color purity and excellent photochemical stability. However, luminescence of rare earth element ions having a millisecond lifetime in an aqueous solution is easily quenched. An effective method for overcoming the obstacle is to introduce rare earth element ions into a crosslinked hydrogel system, so that the hydration is obviously reduced, the fluorescence intensity is improved, and compared with most rare earth element materials synthesized in an organic solvent, the rare earth element hydrogel is more environment-friendly and has wider application range. Common fluorescent hydrogel doped with small molecular rare earth ligands (such as terpyridine, dipicolinic acid, iminodiacetic acid and the like) has poor mechanical properties, and polysaccharide serving as a high molecular chain segment can form an interpenetrating network with other high molecular chain segments in gel so as to strengthen and toughen the hydrogel. Therefore, the rare earth-polysaccharide complex in the invention simultaneously acts as a luminescent group and a crosslinked network in the hydrogel so as to improve the fluorescence and mechanical properties of the hydrogel. In addition, most rare earth fluorescent hydrogels only take optical signals as the singleness of the output mode, so that the requirements of the current hydrogel on multifunctional man-machine interaction cannot be met, and therefore, high-conductivity materials are added into the hydrogel to realize the dual-channel output of fluorescent signals and electric signals. Currently, conductivity is generally achieved by dispersing graphene, carbon nanotubes, metal nanowires, or conductive polymers in hydrogels. However, the deep color materials such as graphene and carbon nano tubes can prevent ultraviolet absorption and fluorescence emission, so that the addition of nano copper powder as a conductive medium plays an important role in maintaining the transparency, absorbance and conductivity of the material. Disclosure of Invention Aiming at the defects of the existing rare earth hydrogel technology, the invention aims to provide the multifunctional hydrogel with double sensing channels, and overcomes the defect of poor mechanical properties of the traditional small molecular rare earth hydrogel. The europium ion-arabinogalactan-nanometer copper powder hydrogel has the tensile length of 11 times as high as that of the europium ion-arabinogalactan-nanometer copper powder hydrogel, good electrical sensing performance, sensing sensitivity GF of 21, stable cycle performance, good man-machine interaction performance and capability of rapidly reacting to the external ion environment in the aspect of fluorescence sensing. The invention has the important significance of solving the problems that most rare earth element luminous hydrogel has poor mechanical properties and only has one sensing mode of optical signals, preparing rare earth doped hydrogel which meets the use requirement and has excellent performance, providing technical support for fluorescent sensors and wearable and electronic skin application, and having wide application prospect. In order to achieve the above object, the technical scheme of the present invention is as follows. A rare earth-polysaccharide based multifunctional hydrogel comprises deionized water (82 wt%), acrylamide (16.5 wt%), polysaccharide (arabinogalactan, 0.58 wt%), polyethylene glycol (0.82 wt%), nano copper powder (0.1 wt%), and the formed polysaccharide based hydrogel is doped with europium ions. The invention relates to a design method of rare earth-polysaccharide based multifunctional hydrogel, which comprises the following specific steps: (1) Sequentially dissolving polyethylene glycol, polysaccharide and acrylamide serving as raw materials into deionized water, and placing the deionized water on a magnetic stirrer for fully and uniformly mixing; (2) Adding nano copper powder, and uniformly dispersing the nano copper powder in the solution by using a mixing