RU2426484C1 - Method of medical mask manufacturing - Google Patents

Abstract

FIELD: medicine. ^ SUBSTANCE: invention relates to manufacturing of medical masks and is aimed at application of nanotechnology for individual efficient bactericidal defence, namely to operative obtaining colloidal solution of silver nanoparticles in water with simultaneous soaking in it of fabric mask workpieces. Method of medical mask manufacturing includes sewing mask workpiece from woven fabric, soaking it in colloidal solution of silver nanoparticles, increase of cohesion of nanoparticles with mask fabric. Colloidal solution for soaking, soaking and increase of cohesion are performed simultaneously with destruction of silver target with pulses of focused laser irradiation on copper vapours by placement of mask workpieces and silver target into cuvette with water, and delivery of laser irradiation to target through window in cuvette bottom. ^ EFFECT: processes of solution obtaining and application take place simultaneously, no additional US generator is required, negative side effects of application of silver nanoparticle solution are absent. ^ 1 dwg

Description

The invention is aimed at providing individual effective bactericidal protection based on the use of nanotechnology, namely, the prompt production of a colloidal solution of silver nanoparticles in water with the simultaneous impregnation of fabric blanks of medical masks in it.

Silver nanoparticles are formed during the pulsed action of copper vapor laser radiation on a silver target placed in a liquid. Distilled water is used as a liquid.

Laser radiation parameters:

- radiation wavelengths - 0.51 and 0.58 microns;

- energy of the radiation pulse - 1 ... 5 mJ;

- radiation pulse duration - 20 ns;

- pulse repetition rate - 5 ... 15 kHz.

At the moment of evaporation of the next portion of silver, an expanding erosion torch creates a pressure wave in the liquid. This pressure acts on the mask material with a frequency of the laser pulse repetition rate and provides additional adhesion of nanoparticles to the villi of the mask tissue.

A known method of obtaining a medical mask, which consists in impregnating the blank mask in a pre-prepared colloidal solution of silver. With this method, an increase in the adhesion of silver particles to the fabric is achieved by using an additional ultrasonic generator placed in the solution.

The proposed method differs in the following.

1. The processes of obtaining and using the solution take place simultaneously;

2. No additional ultrasonic generator is required.

Additional benefits include:

- the well-known preference for a solution of silver nanoparticles over a solution of silver ions due to the absence of negative side effects.

The use of a copper vapor laser is predetermined by the fact that:

- water is transparent to this radiation;

- when the target is destroyed by nanosecond pulses in the mode of "explosive" evaporation in water, the destruction products are nanoparticles in the form of flakes with a diameter of 60 and a thickness of several nanometers;

- the collapse of the erosion torch from laser exposure in water generates a water hammer, which helps to increase the adhesion of silver nanoparticles to the material of the mask fabric.

The specified technical result is achieved by the fact that in the process of destruction of the silver plate in water by pulses of laser radiation on copper vapor, a colloidal solution forms, periodically mixed by the energy of the erosion torch. For destruction, a special, so-called "explosive" mode of exposure to laser pulses is selected.

As an example, a Kulon-10 copper vapor laser with the parameters:

- radiation pulse energy - 1 mJ;

- radiation pulse duration - 20 ns;

- pulse repetition rate - 15 kHz;

- the focal length of the focusing lens is 100 mm.

The drawing shows a "schematic diagram of the proposed method." Key numbers indicate:

1 - mesh container with masks;

2 - silver target;

3 - process chamber;

4 - colloidal solution;

5 - a laser beam;

6 - focusing element.

A pure jewelry silver plate was used as the target material.

The exposure time of the target and the impregnation of the masks was 17 minutes.

The work “A New Method for Coating Fabrics with Silver Nanoparticles”, available on the websites of “Nanotechnologies Popnano.ru/News/Materials and Structures” and http://kc-kachestvo.ru/textile/torre-kakchestvo1949.html “Personnel”, was chosen as an analogue. Quality Center. ” According to these sources, researchers from Switzerland and Israel have developed a new method for producing fabrics (cotton, nylon and polyester) coated with silver nanoparticles.

In a solution of silver nitrate in a mixture of water-ethylene glycol is placed a sample of cotton fabric, which is then subjected to ultrasonic treatment.

The mass fraction of precipitated silver weakly depends on the nature of the fabric. This suggests that the particles are retained due to physical adsorption. Apparently, ultrasound, as it were, presses particles into the surface of the fibers. The average particle size is about 80 nm, but larger aggregates are also observed.

Another source of information (prototype) was the work “The formation of nanoparticles during laser ablation of metals in liquids” by authors: F. Bozon-Verdyura, G.F.Shafeev and others from the journal “Quantum Electronics”, No. 8, 2003, p. 714-720.

Claims (1)

A method of manufacturing a medical mask, including sewing a blank of a mask from a woven material, impregnating it in a colloidal solution of silver nanoparticles, increasing the adhesion of silver particles to the mask fabric, characterized in that the colloidal solution for impregnation, impregnation and increasing adhesion are carried out in parallel with the destruction of the silver target by focused pulses radiation of a copper vapor laser by placing blanks of masks and a silver target in a cuvette with water and delivering laser radiation to the target through a window in the bottom of the cuvette.