5 results about "Polyelectrolyte brushes" patented technology

The invention belongs to the technical field of biological adhesives, and provides a ball brush-aggregate composite biological adhesive as well as a preparation method and application of the ball brush-aggregate composite biological adhesive. A certain amount of nano spherical polyelectrolyte brush is added in the preparation process of a natural high-molecular polymer electrolyte composite coacervate to prepare the ball brush-coacervate composite biological adhesive. The natural high-molecular polymer electrolyte composite coacervate comprises a cationic natural high-molecular polymer and an anionic natural high-molecular polymer. Compared with a polyelectrolyte aggregate adhesive without ball brush doping, the ball brush-aggregate composite adhesive prepared by the invention shows higher adhesion strength and stability, and has a wide application prospect as a biological adhesive.

The application provides a method for continuously and dynamically recombining to prepare a hydrophilic lubricating zwitterionic polyurethane and the zwitterionic polyurethane and application thereof, and relates to the technical field of medical polymer materials for implant intervention. The application first synthesizes a polyurethane elastomer containing a dynamic tert-butyl urea bond and an ATRP initiator; then, the elastomer is crushed into fine particles, and a polyelectrolyte brush is introduced onto the surface of the particles through SI-ATRP reaction; the particles with the introduced polyelectrolyte brush are treated through hot pressing to obtain a uniform and transparent zwitterionic polyurethane film; after continuous crushing, grafting of the polyelectrolyte brush and hot pressing for multiple times, a zwitterionic polyurethane with a high polyelectrolyte brush content is obtained. The zwitterionic polyurethane prepared by the application contains a high content of polyelectrolyte brushes in the bulk and on the surface, has controllable mechanical and hydrophilic lubricating properties, and is expected to be widely applied in the field of medical devices for implant intervention.

The application discloses a kind of brine evaporation power generation hydrogel and its preparation method and application, belong to energy power generation technical field.Polyelectrolyte polystyrene sulfonic acid sodium (PNaSS) is used, and its microstructure presents "brush-like" structure, when the hydrogel (HPH) prepared is immersed in high concentration brine, a large number of salt ions pass through the polyelectrolyte brush channel, because PNaSS chain itself has negative charge, more easily attract sodium ion Na + The material in the application has low cost and simple preparation, and the thermal gradient generated by the hydrogel under light can induce water evaporation, thereby driving ion selective through the charged channel. The application uses a power-free, environmentally friendly and economical way to carry out seawater desalination and evaporation power generation, making the evaporation efficiency and power generation capacity stronger, which has important significance for realizing solar steam and water evaporation power generation in seawater.

The application discloses a preparation method of a polyelectrolyte brush for quickly treating heavy metal complex wastewater, and belongs to the water treatment adsorption technical field in the environmental protection field. The specific steps of the method are as follows: (1) after dopamine hydrochloride is dissolved in DMF, an initiator and triethylamine are added, and stirring is carried out for 3 hours, and the solution is recorded as solution A. Solution A is poured into a graphene oxide hydrochloride buffer solution (pH=8.5), mixed and stirred for 1 day, and then solid A is obtained through separation and drying. (2) solid A is ultrasonically dispersed in a solution of methanol and water, and then monomers, copper bromide, a solution initiator and a ligand are added in sequence. After stirring and dissolving, ascorbic acid is added, and stirring is carried out at 30 DEG C for 1 day. After separation and drying, the polyelectrolyte brush is obtained. The polyelectrolyte brush can synergistically adsorb heavy metal complexes by regulating the electrostatic interaction of the polyelectrolyte chain, the organic molecule interaction and the nanometer interface effect of the substrate, so that the heavy metal complexes are quickly adsorbed and enriched in the polyelectrolyte brush, and low-concentration complex heavy metal ions can be efficiently removed.

This invention discloses an exosome subpopulation enrichment device and method based on dielectrophoresis, belonging to the fields of molecular biology and clinical testing technology. The device includes a pretreatment tube, a dielectrophoresis separation tube, and a collection chamber. The inner wall of the pretreatment tube is modified with a pH-responsive polyelectrolyte brush, a pre-filter membrane is disposed at the bottom, and a non-contact microelectrode array is disposed on the upper part of the outer wall. The dielectrophoresis separation tube is sleeved outside the pretreatment tube, and its inner wall is covered with a conductive layer as a counter electrode. An annular fluid channel is formed between the two tubes, and the area where the microelectrode array is located in the annular fluid channel constitutes the dielectrophoresis enrichment zone. A horizontal microchannel is formed on the side wall of the dielectrophoresis separation tube, and the inlet end of the horizontal microchannel is connected to the top of the dielectrophoresis enrichment zone. The collection chamber is connected to the outlet end of the horizontal microchannel. This invention overcomes the limitations of traditional particle size sieving, enabling precise enrichment and extraction of exosome subpopulations from different cell sources or functional states under shear-free conditions, while maintaining the complete biological activity of the exosomes.