CN105231523A - Efficient protecting mask taking triboelectric nano power generator as filtering layer - Google Patents
Efficient protecting mask taking triboelectric nano power generator as filtering layer Download PDFInfo
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- CN105231523A CN105231523A CN201510643870.5A CN201510643870A CN105231523A CN 105231523 A CN105231523 A CN 105231523A CN 201510643870 A CN201510643870 A CN 201510643870A CN 105231523 A CN105231523 A CN 105231523A
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Abstract
The invention discloses an efficient protecting mask taking a triboelectric nano power generator as a filtering layer. The efficient protecting mask is formed by arranging the triboelectric nano power generator in a ventilation cover of the protecting mask, the triboelectric nano power generator is composed of an upper friction pole plate and a lower friction pole plate, the upper friction pole plate is formed by growing a ZnO nano array on one side of nonwoven cloth and serves as a friction layer obtaining electrons, nano Ag conductive ink coats the other side of the nonwoven cloth to serve as an output electrode, the lower friction pole plate is formed by magnetron sputtering of metal Al on one side of a copper net with 200 meshes and serves as a friction layer losing electrons, the other side of the copper net serves as an output electrode, and the lower friction pole plate of the triboelectric nano power generator is fixed to a bottom ventilation plate of the ventilation cover. The efficient protecting mask has the advantages that surface treatment is performed on the nonwoven cloth, so that physical adsorption efficiency of the nonwoven cloth is maintained while the electrostatic adsorption effect is improved without changing breathability; electric charge generated on the surface and high voltage between the friction pole plates have a bacterial killing and inhibiting effect, and the efficient protecting mask has a remarkable technical effect.
Description
Technical field
The invention belongs to high efficiency filter technology, particularly a kind of high efficient protected mouth mask that is filter course with the electric nano generator that rubs.
Background technology
The technology of preparing of friction nanometer power generator reaches its maturity, its open-circuit voltage and short circuit current are from initial several volts (V) and several peace (nA) of receiving, be developed to and reached open-circuit voltage V up to ten thousand now, a few mA of short circuit current, even arrives the level of A.Its application, also be extended to the research of bio-compatible friction nanometer power generator and possible biomedical applications from the acoustic energy initial driving portable electric appts, sensor, collection switching environment, low-frequency vibration mechanical energy, tide energy, wind energy etc., and show wide application prospect.
China is as developing power, fossil energy (as coal, oil, natural gas) efficiency of combustion is low, denouncing of urban development always, along with the enhancing of China's national power, living standards of the people day by day improve, huge numbers of families come into by versatility automobile, but the impact of thing followed haze on people's life and quality of life is increasing.As can be seen from some big or middle Monitoring Urban Environment data, the time ratio of serious haze weather reaches 66.6%.The healthy of people in such weather serious threat, the particle that especially in air, particle diameter is less than 0.3 μm, once suck in lung more likely penetration rate of blood oxygen barrier, produces pathology.Equally, the long-term workman worked in dust atmosphere is endured especially to the fullest extent to the puzzlement of " silicosis ".Therefore, based on healthy consideration, increasing people have selected and wears masks.The mouth mask that traditional handicraft is produced, its dust-proof approach mainly relies on the mechanism such as Direct Acquisition, inertial deposition, gravity sedimentation and diffusional deposition, can the larger dust granules of filter sizes, and for the particle of particle diameter 0.3-1.0 μm of size, its filter efficiency is not ideal enough.So the mankind in the urgent need to seeking a kind of novel strobe utility, and prepare the excellent protective mask of strainability, meet special industrial and civilian demand.
At present, research for Electrostatic Absorption filter face mask is only confined to add single layer of electret material in overcoat, but, Electrostatic Absorption ability due to electret itself can raise with temperature and decay, and due on electret electricity distribution limited, when the charged particle of absorption reaches certain electricity, the adsorption effect of electret just declines greatly, thus makes the dust removing effects of mouth mask not ideal enough.Therefore, in conjunction with the development opportunity of current friction electric generator, nano surface modification is carried out to stomodaeum cover filtering material-non-woven fabrics, and add another nano aluminum modification copper mesh as frictional layer pole plate, the high efficiency dustproof filtering mouth mask that design and development is a kind of is filter course with the electric nano generator that rubs, and improve its tolerance.Mentality of designing and the preparation method of this gauze mask have no relevant report both at home and abroad at present.
Summary of the invention
The object of the invention is the problem low for current protective mask filter efficiency, service life is short, a kind of high efficient protected mouth mask being filter course with the electric nano generator that rubs is provided, this protective mask not only significantly promotes electro static filtering performance, and also has remarkable result for electrostatic is antibacterial.
Technical scheme of the present invention:
A kind of high efficient protected mouth mask that is filter course with the electric nano generator that rubs, form by arranging friction susceptance rice generator in protective mask range hood, the electric nano generator of described friction is made up of upper friction pole plate and lower friction pole plate, upper friction pole plate is grown ZnO nano array as the frictional layer obtaining electronics in the one side of non-woven fabrics, the another side coated with nano Ag electrically conductive ink of non-woven fabrics is as output electrode, the internal diameter of non-woven fabrics is 2-4cm, external diameter is 10-14cm, thickness is 1-4mm, and the thickness of coated with nano Ag electrically conductive ink is 2-6 μm; Lower friction pole plate is as betatopic frictional layer at a magnetron sputtering metal A l of 200 object copper mesh, the another side of copper mesh is as output electrode, copper mesh order number >=200 order, be of a size of internal diameter 2-4cm, external diameter 10-14cm, the thickness of magnetron sputtering metal Al layer is 40-80 μm, and the lower friction pole plate of the electric nano generator that rubs and the bottom of protective mask range hood plate of taking a breath is fixed.
Described with a preparation method for the electric nano generator that the rubs high efficient protected mouth mask that is filter course, step is as follows:
(1) preparation of upper friction pole plate
1) by commercially available thickness be the toroidal that the non-woven fabrics of 1-4mm is cut into internal diameter 2-4cm, external diameter 10-14cm, put into deionized water to soak into completely and ultrasonic cleaning 20-40min, all deionized water will be changed before each cleaning, after non-woven fabrics is cleaned 2-4 time repeatedly, again with the alcohol ultrasonic process 30-50min of mass percent concentration >=99.75%, then at 100-120 DEG C, dry 2-4h in the vacuum drying chamber of≤1Pa air pressure, obtains cleaned non-woven fabrics;
2) zinc acetate powder is added in absolute ethyl alcohol obtain mixed solution, be placed in 90-100 DEG C of water bath with thermostatic control and be incubated 30-60min, then in mixed solution, add LiOHH
2o, ultrasonic vibration 1-3h makes lithium hydroxide dissolve completely, add again in mixed solution after suction filtration absolute ethyl alcohol by this solution dilution to original mixed liquor volume 3-5 doubly, then be stirred and heated to fluidized state and continue 1-10min, now there is obvious dregs in solution, be cooled to room temperature and be placed on standing>=24h in refrigerator, obtain colloidal sol, described zinc acetate powder, absolute ethyl alcohol and LiOHH
2the amount ratio of O is 3-5g:100-300mL:1-3g;
3) by step 1) cleaned non-woven fabrics lifts in above-mentioned colloidal sol, to form uniform crystal seed layer in nonwoven surface, then dry process 5-10min in the baking oven of 60-80 DEG C is placed on by unsettled for the non-woven fabrics after lift, repeat said process three times, then by non-woven fabrics dry 15-30min in an oven, the non-woven fabrics being coated with ZnO crystal seed layer is obtained;
4) by Zn (NO
3) 26H
2o and hexamethylenetetramine are dissolved in the deionized water of 100-400mL respectively, treat Zn (NO
3) 26H
2after O and hexamethylenetetramine dissolve completely, by the mixing of two kinds of solution and ultrasonic 10-30min obtains mixed solution, then by through step 3) process obtain non-woven fabrics be dipped vertically into and be equipped with in the open containers of mixed solution, after preservative film airtight container opening, the above-mentioned container that mixed solution is housed is placed in>=water bath with thermostatic control the 3-5h of 95 DEG C, hanging on the growth of the non-woven fabrics in container ZnO, grow rear deionized water positive and negative repeatedly to rinse 3-6 time, then dry 12-24h at being placed in vacuum drying chamber 60-80 DEG C, obtain the non-woven fabrics growing ZnO nano array, described Zn (NO
3) 26H
2the amount ratio of O and deionized water is 1-3g:100-400mL, and the amount ratio of hexamethylenetetramine and deionized water is 1-4g:100-400mL,
5) silver-colored electrically conductive ink is preheated to >=40 DEG C, be coated to the another side of the non-woven fabrics after above-mentioned growth ZnO uniformly with hairbrush, each coating thickness is 1-3 μm, then vacuum drying >=12h at temperature 50-80 DEG C, this coating-dry run repeats 4-6 time, and rub on obtained pole plate;
(2) preparation of the pole plate that rubs under
1) copper mesh is cut in the same size with upper friction pole plate after, put into deionized water for ultrasonic concussion cleaning 20-60min, change deionized water repeated washing 2-4 time, then use the alcohol ultrasonic vibration 30-60min of mass percent concentration >=99.75%, and in the vacuum drying chamber of≤1Pa air pressure dry 2-4h;
2) copper mesh obtained above is utilized magnetron sputtering metal Al layer, purity>=99.99% of aluminium target, the parameter of magnetron sputtering is sputtering power 30-45w, sputtering time 30-50min, operating current 0.089-1A, operating voltage 320-400V, background vacuum>=4.0 × 10
-4pa, working vacuum degree≤1.7pa, argon flow amount 30-50cm
3/ s, obtain the copper mesh of splash-proofing sputtering metal Al layer as lower friction pole plate, copper mesh lower floor and sputtering target close contact, play a good protection to another surface;
(3) rub electric nano generator assembling and implant mouth mask
Insert in range hood by relative with the Al coat side of lower friction pole plate for the ZnO nano array face of upper friction pole plate, copper mesh as lower friction pole plate is fixed on the bottom ventilation plate of range hood, upper friction pole plate is placed in lower friction pole plate and can freely-movable, the obtained high efficient protected mouth mask that is filter course with the electric nano generator that rubs.
Advantage of the present invention is:
The raw material non-woven fabrics manufacturing common mouth mask is carried out surface treatment by the present invention, while its physical absorption efficiency of maintenance, increases Electrostatic Absorption effect; In addition, the high voltage between the electric charge that produces of surface and friction pole plate also plays the effect of bactericidal; Mouth mask prepared by the present invention is while having above-mentioned advantage concurrently, and its gas permeability can not change, obvious technical effects.
Accompanying drawing explanation
Fig. 1. be the structural representation of the high efficient protected mouth mask that is filter course with the electric nano generator that rubs.
Fig. 2 is friction susceptance rice filter generator Rotating fields schematic diagram.
Fig. 3 emulates schematic diagram in filter generator layer implantation mouth mask.
Fig. 4 is friction susceptance rice filter generator layer schematic diagram.
Fig. 5 is that the electric nano generator of friction rubs the surface treatment effect figure of pole plate up and down, in figure: non-woven fabrics grows ZnO for a, b; C, b are magnetron sputtering Al on copper mesh.
In figure: 1. range hood, rub 2. pole plate, 3. time friction pole plate, plate of taking a breath 4..
Detailed description of the invention
Instantiation illustrated is below intended to understand objective purposes of the present invention in detail and understand intuitively to make reader have.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.
Embodiment:
A kind of high efficient protected mouth mask that is filter course with the electric nano generator that rubs, as Figure 1-3, form by arranging friction susceptance rice generator in commercially available protective mask range hood 1, the electric nano generator of described friction is made up of upper friction pole plate 2 and lower friction pole plate 3, upper friction pole plate 2 is grown ZnO nano array as the frictional layer obtaining electronics in the one side of non-woven fabrics, the another side coated with nano Ag electrically conductive ink of non-woven fabrics is as output electrode, the internal diameter of non-woven fabrics is 3cm, external diameter is 11cm, thickness is 2mm, and the thickness of coated with nano Ag electrically conductive ink is 5 μm; Lower friction pole plate 3 is as betatopic frictional layer at a magnetron sputtering metal A l of 200 object copper mesh, the another side of copper mesh is as output electrode, copper mesh order number is 200 orders, be of a size of internal diameter 3cm, external diameter 11cm, the thickness of magnetron sputtering metal Al layer is 50 μm, and the lower friction pole plate of the electric nano generator that rubs 3 and the bottom of protective mask range hood 1 plate 4 of take a breath is fixing.
Above-mentioned with the preparation method of the electric nano generator that the rubs high efficient protected mouth mask that is filter course, step is as follows:
(1) preparation of upper friction pole plate
1) by commercially available thickness be the toroidal that the non-woven fabrics of 3mm is cut into internal diameter 3cm, external diameter 13cm, put into deionized water to soak into completely and ultrasonic cleaning 40min, all deionized water will be changed before each cleaning, after non-woven fabrics is cleaned 2 times repeatedly, be the alcohol ultrasonic process 40min of 99.75% again with mass percent concentration, then at 110 DEG C, dry 4h in the vacuum drying chamber of 1Pa air pressure, obtains cleaned non-woven fabrics;
2) 6g zinc acetate powder is added in 600mL absolute ethyl alcohol obtain mixed solution, be placed in 94 DEG C of waters bath with thermostatic control and be incubated 60min, then in mixed solution, add 3gLiOHH
2o, ultrasonic vibration 3h makes lithium hydroxide dissolve completely, in mixed solution, absolute ethyl alcohol is added again by this solution dilution to 4 times of original mixed liquor volume after suction filtration, then be stirred and heated to fluidized state and continue 1min, now there is obvious dregs in solution, be cooled to room temperature and be placed on standing 45h in refrigerator, obtain colloidal sol;
3) by step 1) cleaned non-woven fabrics lifts in above-mentioned colloidal sol, to form uniform crystal seed layer in nonwoven surface, then dry process 10min in the baking oven of 80 DEG C is placed on by unsettled for the non-woven fabrics after lift, repeat said process three times, then by non-woven fabrics dry 30min in an oven, the non-woven fabrics being coated with ZnO crystal seed layer is obtained;
4) by 3gZn (NO
3) 26H
2o and 6g hexamethylenetetramine is dissolved in the deionized water of 300mL respectively, treats Zn (NO
3) 26H
2after O and hexamethylenetetramine dissolve completely, by the mixing of two kinds of solution and ultrasonic 20min obtains mixed solution, then by step 3) non-woven fabrics being coated with ZnO crystal seed layer that obtains is dipped vertically into and is equipped with in the beaker of mixed solution, after preservative film sealed beaker, be placed in the water bath with thermostatic control 3h of 95 DEG C, hanging on the growth of the non-woven fabrics in container ZnO, grow rear deionized water positive and negative and repeatedly rinse 4 times, then be placed in dry 12h at vacuum drying chamber 60 DEG C, obtain the non-woven fabrics growing ZnO nano array;
5) silver-colored electrically conductive ink is preheated to 40 DEG C, be coated to the another side of the non-woven fabrics after above-mentioned growth ZnO uniformly with hairbrush, each coating thickness is 2 μm, then vacuum drying >=12h at temperature 50-80 DEG C, this coating-dry run repeats 5 times, and rub on obtained pole plate;
(2) preparation of the pole plate that rubs under
1) copper mesh is cut in the same size with upper friction pole plate after, put into deionized water for ultrasonic concussion cleaning 40min, change deionized water repeated washing 4 times, then with the alcohol ultrasonic vibration 340min of mass percent concentration 99.75% to guarantee greasy dirt and the dust of removing copper mesh surface completely, then dry 4h at 80 DEG C in the vacuum drying chamber of 0.7Pa air pressure;
2) copper mesh obtained above is utilized magnetron sputtering metal Al layer, the purity 99.99% of aluminium target, the parameter of magnetron sputtering is sputtering power 30w, sputtering time 30min, operating current 1A, operating voltage 320V, background vacuum 4.0 × 10
-4pa, working vacuum degree 1.7pa, argon flow amount 30cm
3/ s, obtain the copper mesh of splash-proofing sputtering metal Al layer as lower friction pole plate, copper mesh lower floor and sputtering target close contact, play a good protection to another surface;
(3) rub electric nano generator assembling and implant mouth mask
Insert in range hood by relative with the Al coat side of lower friction pole plate for the ZnO nano array face of upper friction pole plate, copper mesh as lower friction pole plate is fixed on the bottom ventilation plate of range hood, upper friction pole plate is placed in lower friction pole plate and can freely-movable, the obtained high efficient protected mouth mask that is filter course with the electric nano generator that rubs.
Working mechanism of the present invention: see Fig. 4, Fig. 5
In current surrounding environment, the concentration of PM2.5 remains high, and mouth mask is as alleviating haze at present to the instrument of human injury, and its strainability is the focus that people pay close attention to always.But General Physics strobe utility is difficult to the granule effective filtering of particle diameter at 0.3 μm-1.0 μm.The present invention is by the principle of Electrostatic Absorption, and people wears in the respiratory of mouth mask, and air-flow can produce certain air pressure to non-woven fabrics by non-woven thin-film.On the other hand, we adopt 200 object copper mesh by lower frictional layer, because this bi-material has different elastic modelling quantity, be subject to coming from oral inhalation, air blowing process and will separateing, relative motion will be produced like this between two materials, because non-woven fabrics belongs to the electronic shell that is easy to get, and the copper mesh after sputtered aluminum has easy betatopic feature, so will produce charge adsorption in nonwoven surface due to electrostatic friction.Even neutral granule, when entering into generator and being middle to friction pole plate, due to the high-tension feature of electric nano generator that rubs, neutral particle also can be polarized, so also can be attracted to filter course surface.Simultaneously because non-woven fabrics silk quality fiber surface has the ZnO nano array prepared, while increase is to frictional layer area, the physical filtering performance for non-woven fabrics is also a kind of significant lifting.Find that the non-woven fabrics that grown ZnO has good hydrophobicity through experiment, this can keep again the Electrostatic Absorption performance of flexible friction nano generator filter course further simultaneously.
Claims (2)
1. the high efficient protected mouth mask that is filter course with the electric nano generator that rubs, it is characterized in that: form by arranging friction susceptance rice generator in protective mask range hood, the electric nano generator of described friction is made up of upper friction pole plate and lower friction pole plate, upper friction pole plate is grown ZnO nano array as the frictional layer obtaining electronics in the one side of non-woven fabrics, the another side coated with nano Ag electrically conductive ink of non-woven fabrics is as output electrode, the internal diameter of non-woven fabrics is 2-4cm, external diameter is 10-14cm, thickness is 1-4mm, and the thickness of coated with nano Ag electrically conductive ink is 2-6 μm; Lower friction pole plate is as betatopic frictional layer at a magnetron sputtering metal A l of 200 object copper mesh, the another side of copper mesh is as output electrode, copper mesh order number >=200 order, be of a size of internal diameter 2-4cm, external diameter 10-14cm, the thickness of magnetron sputtering metal Al layer is 40-80 μm, and the lower friction pole plate of the electric nano generator that rubs and the bottom of protective mask range hood plate of taking a breath is fixed.
2., as claimed in claim 1 with a preparation method for the electric nano generator that the rubs high efficient protected mouth mask that is filter course, it is characterized in that step is as follows:
(1) preparation of upper friction pole plate
1) by commercially available thickness be the toroidal that the non-woven fabrics of 1-4mm is cut into internal diameter 2-4cm, external diameter 10-14cm, put into deionized water to soak into completely and ultrasonic cleaning 20-40min, all deionized water will be changed before each cleaning, after non-woven fabrics is cleaned 2-4 time repeatedly, again with the alcohol ultrasonic process 30-50min of mass percent concentration >=99.75%, then at 100-120 DEG C, dry 2-4h in the vacuum drying chamber of≤1Pa air pressure, obtains cleaned non-woven fabrics;
2) zinc acetate powder is added in absolute ethyl alcohol obtain mixed solution, be placed in 90-100 DEG C of water bath with thermostatic control and be incubated 30-60min, then in mixed solution, add LiOHH
2o, ultrasonic vibration 1-3h makes lithium hydroxide dissolve completely, add again in mixed solution after suction filtration absolute ethyl alcohol by this solution dilution to original mixed liquor volume 3-5 doubly, then be stirred and heated to fluidized state and continue 1-10min, now there is obvious dregs in solution, be cooled to room temperature and be placed on standing>=24h in refrigerator, obtain colloidal sol, described zinc acetate powder, absolute ethyl alcohol and LiOHH
2the amount ratio of O is 3-5g:100-300mL:1-3g;
3) by step 1) cleaned non-woven fabrics lifts in above-mentioned colloidal sol, to form uniform crystal seed layer in nonwoven surface, then dry process 5-10min in the baking oven of 60-80 DEG C is placed on by unsettled for the non-woven fabrics after lift, repeat said process three times, then by non-woven fabrics dry 15-30min in an oven, the non-woven fabrics being coated with ZnO crystal seed layer is obtained;
4) by Zn (NO
3) 26H
2o and hexamethylenetetramine are dissolved in the deionized water of 100-400mL respectively, treat Zn (NO
3) 26H
2after O and hexamethylenetetramine dissolve completely, by the mixing of two kinds of solution and ultrasonic 10-30min obtains mixed solution, then by through step 3) process obtain non-woven fabrics be dipped vertically into and be equipped with in the open containers of mixed solution, after preservative film airtight container opening, the above-mentioned container that mixed solution is housed is placed in>=water bath with thermostatic control the 3-5h of 95 DEG C, hanging on the growth of the non-woven fabrics in container ZnO, grow rear deionized water positive and negative repeatedly to rinse 3-6 time, then dry 12-24h at being placed in vacuum drying chamber 60-80 DEG C, obtain the non-woven fabrics growing ZnO nano array, described Zn (NO
3) 26H
2the amount ratio of O and deionized water is 1-3g:100-400mL, and the amount ratio of hexamethylenetetramine and deionized water is 1-4g:100-400mL,
5) silver-colored electrically conductive ink is preheated to >=40 DEG C, be coated to the another side of the non-woven fabrics after above-mentioned growth ZnO uniformly with hairbrush, each coating thickness is 1-3 μm, then vacuum drying >=12h at temperature 50-80 DEG C, this coating-dry run repeats 4-6 time, and rub on obtained pole plate;
(2) preparation of the pole plate that rubs under
1) copper mesh is cut in the same size with upper friction pole plate after, put into deionized water for ultrasonic concussion cleaning 20-60min, change deionized water repeated washing 2-4 time, then use the alcohol ultrasonic vibration 30-60min of mass percent concentration >=99.75%, and in the vacuum drying chamber of≤1Pa air pressure dry 2-4h;
2) copper mesh obtained above is utilized magnetron sputtering metal Al layer, purity>=99.99% of aluminium target, the parameter of magnetron sputtering is sputtering power 30-45w, sputtering time 30-50min, operating current 0.089-1A, operating voltage 320-400V, background vacuum>=4.0 × 10
-4pa, working vacuum degree≤1.7pa, argon flow amount 30-50cm
3/ s, obtain the copper mesh of splash-proofing sputtering metal Al layer as lower friction pole plate, copper mesh lower floor and sputtering target close contact, play a good protection to another surface;
(3) rub electric nano generator assembling and implant mouth mask
Insert in range hood by relative with the Al coat side of lower friction pole plate for the ZnO nano array face of upper friction pole plate, copper mesh as lower friction pole plate is fixed on the bottom ventilation plate of range hood, upper friction pole plate is placed in lower friction pole plate and can freely-movable, the obtained high efficient protected mouth mask that is filter course with the electric nano generator that rubs.
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|---|---|---|---|
| CN201510643870.5A CN105231523B (en) | 2015-10-08 | 2015-10-08 | Efficient protecting mask taking triboelectric nano power generator as filtering layer |
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Cited By (9)
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| CN105771107A (en) * | 2016-04-26 | 2016-07-20 | 王赫奕 | Non-stuffy and actual effect-displayable automatic haze blocking device, blocking method and application |
| CN106026759A (en) * | 2016-05-20 | 2016-10-12 | 北京科技大学 | Transient dissoluble friction electric generator and preparation method thereof |
| CN107565306A (en) * | 2017-08-30 | 2018-01-09 | 北京国科世纪激光技术有限公司 | Nano dust removal device and laser in a kind of laser |
| CN108264886A (en) * | 2016-12-30 | 2018-07-10 | 北京纳米能源与系统研究所 | From sterilization friction material, friction nanometer power generator and air cleaning unit |
| CN109171061A (en) * | 2018-07-02 | 2019-01-11 | 中科纳清（江苏）科技有限公司 | Nanometer generating unit, binary channels respiratory system and mask |
| CN109316679A (en) * | 2017-07-31 | 2019-02-12 | 北京纳米能源与系统研究所 | Rub Electro Sorb mask |
| WO2021098480A1 (en) * | 2019-11-20 | 2021-05-27 | 华南理工大学 | Full-fiber electret generator-based highly efficient protective mask and preparation method therefor |
| US11478191B1 (en) * | 2020-04-03 | 2022-10-25 | Esatto Healthcare, Inc. | Smart mask for COVID-19 screening, tracking and monitoring |
| WO2023163973A1 (en) * | 2022-02-23 | 2023-08-31 | Nexvera Llc | Antimicrobial face mask |
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| CN109171061A (en) * | 2018-07-02 | 2019-01-11 | 中科纳清（江苏）科技有限公司 | Nanometer generating unit, binary channels respiratory system and mask |
| WO2021098480A1 (en) * | 2019-11-20 | 2021-05-27 | 华南理工大学 | Full-fiber electret generator-based highly efficient protective mask and preparation method therefor |
| US11478191B1 (en) * | 2020-04-03 | 2022-10-25 | Esatto Healthcare, Inc. | Smart mask for COVID-19 screening, tracking and monitoring |
| WO2023163973A1 (en) * | 2022-02-23 | 2023-08-31 | Nexvera Llc | Antimicrobial face mask |
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| CN105231523B (en) | 2017-05-17 |
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