3 results about "SILVER COLLOIDAL" patented technology

The present invention relates to a method for preparing a metal (copper, molybdenum, zinc, magnesium, silver) colloidal solution using resonant vibration particle separation and cryogenic freezing technology, which is suitable for multiple fields such as engineering, biology and medicine. The present invention proposes a method for preparing a colloidal solution of any one of copper, molybdenum, zinc, magnesium or silver. According to the present invention, the cleaned metal blank is placed in distilled water or deionized water, and a resonant acoustic treatment is performed using an ultrasonic generator, thereby forming metal nanoparticles. Subsequently, the particles are subjected to cryogenic freezing treatment, followed by controlled cryogenic thawing, to obtain a stable metal colloidal solution with a particle size of 1-10 nm. The proposed method can generate nanoparticles of 5 to 50 nanometers in the resonant fragmentation stage, and can be further reduced to 1-10 nanometers during the cryogenic freezing process. This method can achieve a high-stability colloidal solution without the use of chemical stabilizers, avoid the production of toxic byproducts, and extend the storage period of the colloidal solution to 1 year.

The application discloses a method and device for preparing antibacterial meta-aramid filaments by dry-wet spinning, and the method comprises the following steps: (1) preparing a nano-silver colloidal solution; (2) dissolving m-phenylenediamine in an N,N-dimethylacetamide solution, adding the nano-silver colloidal solution, and then adding m-phthaloyl chloride to generate a poly-m-phenylenediamine terephthalate polymer solution by low-temperature polycondensation; adding a neutralizing agent and performing vacuum defoaming; (3) extruding the resin stock solution from a spinneret, and then sequentially passing through a primary air layer, a solidification tank, a coagulation bath, water washing, drying, high-temperature stretching, heat setting, and heat stretching to prepare the dry-wet antibacterial meta-aramid filaments. The in-situ polymerization method enables the nano-silver powder and the resin to be fully combined, the chemical modification method enables the combination of the two to be more compact and not easy to fall off, and the problem that the antibacterial performance is not strong and durable is solved.

This invention discloses a method for preparing a nano-silver antibacterial colloidal solution from traditional Chinese medicine using a laser physical method. First, an initial nano-silver colloidal solution is obtained in 20 ml of a PVP aqueous solution (50 ppm) using a liquid-phase laser ablation method. Specific parameters are: laser wavelength 1064 nm, frequency 25 Hz, and time 10 min. Then, 1 ml of honeysuckle extract, 25 ml of honeysuckle hydrosol, 25 ml of centella asiatica hydrosol, and 80 ml of water are added. Laser irradiation continues under stirring, with specific parameters: laser wavelength 532 nm, frequency 10 Hz, and time 3 min. After 1-3 days, the color changes from pale yellow to golden yellow / golden orange, yielding the final nano-silver antibacterial colloidal solution from traditional Chinese medicine. This method provides a new approach and idea for the green development and environmentally friendly production of safe and effective antibacterial and antiviral products; it is universally applicable and can be extended to other specific application types of nanoparticles and traditional Chinese medicine ingredients.