A dust collector in an embodiment includes: a discharge electrode having tips; a counter electrode including a plurality of conductor plates each having an end opposed to the discharge electrode and arrange side by side in a plate thickness direction; and a power supply that applies voltage between the discharge electrode and the counter electrode. The counter electrode has a first region closer to the tips and a second region farther from the tips than the first region, and at least one of an interval, a distance from the tips, and a shape of at least part of ends in the first region is different from an interval, a distance, or a shape in the second region.

A dust collector in an embodiment includes: a discharge electrode having tips; a counter electrode including a plurality of conductor plates each having an end opposed to the discharge electrode and arrange side by side in a plate thickness direction; and a power supply that applies voltage between the discharge electrode and the counter electrode. The counter electrode has a first region closer to the tips and a second region farther from the tips than the first region, and at least one of an interval, a distance from the tips, and a shape of at least part of ends in the first region is different from an interval, a distance, or a shape in the second region.

A standing chair comprises a main frame support assembly with a first frame support and a second frame support, at least two collapsible support arms with a first end and a second end, at least one bracket, at least one seat assembled to the collapsible support arms, a drive member positioned between right frame support and one collapsible support arm, another drive member positioned between left frame support and other collapsible support arm and a foot rest assembly with a pair of leg support bars. Right and left frame supports are parallelly connected and locked via a connecting means. The first ends of collapsible arms are moveably affixed to both right and left frame supports, whereas second ends are pivotally connected to a backrest support via fasteners. The two collapsible support arms are configured to automatically collapse and retract in accordance to sitting or standing mode of the standing chair.

An apparatus and method for purification of air, is disclosed. The apparatus includes: (a) a mist generator, is configured to generate water micro droplets, (b) a charging chamber, is configured to transfer electric charges to the micro droplets, (c) an interacting space is configured to act as a physical barrier and provide sufficient space for adsorption of air pollutants, (d) a collecting chamber is configured to collect the contaminated micro droplets and convert them to a liquid form, (e) and a water recycling section, is configured to remove the contaminations and provide a usable clean water for the mist generator. The collecting chamber of the apparatus is incorporated with a plastic grid enhanced with surface modified nanofibers to promote the micro droplet collecting efficiency. Further, a method of fabricating a plastic grid enhanced with surface modified nanofibers for an air purifier apparatus is also disclosed.

An apparatus and method for purification of air, is disclosed. The apparatus includes: (a) a mist generator, is configured to generate water micro droplets, (b) a charging chamber, is configured to transfer electric charges to the micro droplets, (c) an interacting space is configured to act as a physical barrier and provide sufficient space for adsorption of air pollutants, (d) a collecting chamber is configured to collect the contaminated micro droplets and convert them to a liquid form, (e) and a water recycling section, is configured to remove the contaminations and provide a usable clean water for the mist generator. The collecting chamber of the apparatus is incorporated with a plastic grid enhanced with surface modified nanofibers to promote the micro droplet collecting efficiency. Further, a method of fabricating a plastic grid enhanced with surface modified nanofibers for an air purifier apparatus is also disclosed.

A method of making a fluorinated fibrous web, which method includes providing a nonwoven web 22 that contains polymeric fibers, creating a plasma that contains fluorine atoms at a first location 14, and contacting the nonwoven web with products from the plasma at a second location 26 remote from the first location 14. The method avoids exposure of the web to the plasma and hence expands the manufacturing processing window. Webs so fluorinated have a different C.sub.3F.sub.4H.sup.+ to C.sub.2F.sub.5.sup.+ ratio when compared to locally fluorinated webs having similar levels of surface fluorination. The remote fluorinated webs can be subsequently charged electrically to provide a good performing electret filter 40 suitable for use in an air purifying respirator 30. Webs fluorinated in accordance with this invention also may exhibit good performance even after being aged at high temperatures.

A method of making a fluorinated fibrous web, which method includes providing a nonwoven web 22 that contains polymeric fibers, creating a plasma that contains fluorine atoms at a first location 14, and contacting the nonwoven web with products from the plasma at a second location 26 remote from the first location 14. The method avoids exposure of the web to the plasma and hence expands the manufacturing processing window. Webs so fluorinated have a different C.sub.3F.sub.4H.sup.+ to C.sub.2F.sub.5.sup.+ ratio when compared to locally fluorinated webs having similar levels of surface fluorination. The remote fluorinated webs can be subsequently charged electrically to provide a good performing electret filter 40 suitable for use in an air purifying respirator 30. Webs fluorinated in accordance with this invention also may exhibit good performance even after being aged at high temperatures.

Disclosed herein is a charging apparatus and precipitator. The charging apparatus includes a plurality of counter electrodes formed in a plate shape and arranged in a direction intersecting with a ventilation direction to allow respective surfaces thereof to follow the ventilation direction, and a plurality of high voltage electrodes formed in a wire shape and installed between the plurality of counter electrodes. The plurality of counter electrodes includes a first counter electrode having a first electrode area, and a second counter electrode having a second electrode area less than the first electrode area. The first counter electrode and the second counter electrode are alternately arranged.

The invention relates to a cleaning device for cleaning a gas, in particular air, comprising: a first electrode which is populated with at least one element, preferably a plurality of elements, said at least one element having a surface with a plurality of tips and/or protrusions in order to generate a non-homogeneous electromagnetic field, a second electrode which preferably lies opposite the first electrode, and a voltage source which is electrically connected to the first electrode and/or the second electrode and by means of which a voltage can be built up between the first electrode and the second electrode.

The invention relates to a cleaning device for cleaning a gas, in particular air, comprising: a first electrode which is populated with at least one element, preferably a plurality of elements, said at least one element having a surface with a plurality of tips and/or protrusions in order to generate a non-homogeneous electromagnetic field, a second electrode which preferably lies opposite the first electrode, and a voltage source which is electrically connected to the first electrode and/or the second electrode and by means of which a voltage can be built up between the first electrode and the second electrode.