Filter media and filter products for electronic enclosures
Described are filters useful in a hard disk drive of a comparable electronic device that requires a highly contaminant-free environment for operation, particularly to these devices in combination with the filter, wherein the filter contains graphene.
1. An electronic device enclosure comprising:
a base and a cover,
at least one data storage disk within the enclosure,
one or more heads for reading or writing data onto the disk, and
a filter in fluid communication with an interior of the enclosure, the filter comprising filter media that includes activated carbon and graphene, wherein the graphene is in the form of graphene particles having a dimension in the range of 2 to 20 microns.
2. An enclosure of claim 1 wherein the filter comprises from about 0.5 to 20 weight percent graphene per total weight filter media (not including optional binder).
3. The enclosure of claim 2 wherein graphene is present in an amount in the range of 1 to 15 weight percent of the total weight of graphene and activated carbon in the filter media.
4. An enclosure of claim 1 wherein the activated carbon is in the form of activated carbon particles and the graphene is in the form of graphene particles, and the graphene particles are admixed with the activated carbon particles.
5. An enclosure of claim 1 wherein the filter is a recirculation filter, and the filter is at a location within the enclosure that includes a flow of air produced by rotation of the disk.
6. An enclosure of claim 1 wherein the enclosure is hermetically sealed.
7. An enclosure of claim 1 wherein the filter is a breather filter, and the filter is located adjacent to a breather hole.
8. An enclosure of claim 1 wherein the enclosure contains water vapor and chemical vapor, and the activated carbon is effective to adsorb the water vapor, and the graphene is effective to adsorb the chemical vapor.
9. A method of removing contaminants from an enclosure, the method comprising:
providing the electronic device enclosure of claim 1 further including:
a gaseous atmosphere comprising water vapor and chemical vapor,
allowing the activated carbon to adsorb the water vapor, and
allowing the graphene to adsorb the chemical vapor.
10. A method of claim 9 wherein the chemical vapor comprises a siloxane.
11. A method of claim 9 wherein the chemical vapor comprises a volatile organic compound.
12. A method of claim 9 comprising re-activating the filter.
13. The enclosure of claim 1 wherein (a) the filter has an outer air-permeable scrim that is in contact with and contains the filter media, (b) the filter media is surrounded by a porous, gas-permeable scrim, or both (a) and (b).
14. The enclosure of claim 13 wherein the scrim is in the form of a pouch or envelope that contains the filter media.
15. The enclosure of claim 1 wherein the graphene particles are present in mixture with a binder, a fibrous material, or mixtures thereof.
16. The enclosure of claim 15 wherein the filter has an amount of binder, by weight, that is less than the filter media.
17. The enclosure of claim 16 wherein the filter has an amount of binder, by weight, that is less than 25 parts by weight of the combined amount of filter media and binder.
18. The enclosure of claim 1 wherein graphene is present in a concentrated amount at a central portion of the filter.
19. The enclosure of claim 1 wherein the graphene prevents the activated carbon from contacting and adsorbing chemical vapor, thus allowing activated carbon to maintain a higher capacity to adsorb moisture.
20. An electronic device enclosure comprising:
a base and a cover,
at least one data storage disk within the enclosure,
one or more heads for reading or writing data onto the disk, and
a filter in fluid communication with an interior of the enclosure, the filter comprising filter media that includes activated carbon and graphene, and wherein the filter (a) has an outer air-permeable scrim that is in contact with and contains the filter media, (b) the filter media is surrounded by a porous, gas-permeable scrim, or both (a) and (b).
21. A method of removing contaminants from an enclosure, the method comprising:
providing the electronic device enclosure of claim 20 further including:
a gaseous atmosphere comprising water vapor and chemical vapor,
allowing the activated carbon to adsorb the water vapor, and
allowing the graphene to adsorb the chemical vapor.