2results about How to "Reduce surface stress" patented technology

The application provides a method for improving the bonding force of a neodymium iron boron deposition layer based on a reinforced ion exchange deposition technology, and belongs to the technical field of rare earth permanent magnet material preparation. The method comprises the following steps: neodymium iron boron magnet cleaning pretreatment, removing contaminants and metal oxides on the surface of the magnet; activating the neodymium iron boron magnet by acid corrosion to obtain a pretreated magnet with a rough surface; soaking the pretreated magnet in an electrolyte and connecting the magnet to a negative electrode; and performing ion exchange deposition on the surface of the magnet to be deposited by applying a pulse variable frequency electric field on the surface of the magnet to prepare a deposition layer; wherein, the surface of the magnet is first modified by micro-electrolysis, and then the ion exchange deposition is performed by applying a variable frequency electric field. In the initial stage, the surface of the magnet is continuously subjected to micro-electrolytic corrosion by a stable current to regulate the interface state and then realize surface modification, which is beneficial to the effective bonding of the deposition layer formed by the subsequent ion exchange deposition.

The invention discloses a 3D printing cavernous body organ-like model capable of simulating an erectile physiological process, and belongs to the technical field of tissue engineering and regenerative medicine. The hydrogel is formed by photo-curing 3D printing of a dual-network hydrogel material formed by blending a pig cavernous body acellular extracellular matrix pregel solution and polyethylene glycol diacrylate, and has a bionic sine curve expansion structure; micron-sized grooves for guiding the directional arrangement of smooth muscle cells are formed in the surface of the micro-sphere, and an elliptical cavity for providing structural support is formed in the micro-sphere. A pig cavernous body dECM pre-gel solution is used as a base material, so that a microenvironment for living of cells in a body can be effectively simulated; by regulating and controlling the proportion of PEGDA, the mechanical property of the model is matched with that of a natural cavernous body tissue. The organ model can reproduce the NO-mediated smooth muscle cell relaxation and tissue expansion physiological process in vitro, and provides an effective in-vitro platform for researching the pathological mechanism of erectile dysfunction, screening drugs and developing a novel treatment method.