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Professor Seung Hwan Ko, Developed high efficiency filter to filter fine dust

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2017-07-19

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Professor Seung Hwan Ko from Seoul National University
Developed high efficiency filter to filter fine dust

- Filter- type and dust- collection type eco-friendly filter
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▲ Professor Seung Hwan Ko,
Seoul National University Department of Mechanical and Aerospace Engineering

A high-efficiency fine dust filter was developed by a team of researchers in Korea to effectively filter out fine dust.

Kun Woo Lee, Professor at Seoul National University Department of Mechanical and Aerospace Engineering said that he created a high-efficiency fine dust filter that can be transparent and reusable by using a metal nanowire network in the application nano and thermal engineering lab led by Professor Seung Hwan Ko.

The commercialized air cleaning method is divided into a filter type, which applies fine fiber structure resembling a HEPA filter, and a dust collecting type which collects dust on the opposite polarity collecting plate by charging the particles using electric discharge.

In the case of conventional filter-type air cleaning method, since it uses a multiple filter, it has a disadvantage of obstructing the natural flow of air and it is difficult to filter particles smaller than the pore size of the filter. In addition, in order to improve air cleaning efficiency, it was necessary to replace the filter with a new one periodically.

In the case of dust collection type air cleaning method, ozone or nitrogen oxide which is harmful to the human body is generated in the electric discharge process and consumes a lot of electric energy as well.

Professor Seung Hwan Ko said, "We tried to combine the advantages of filter type and dust collection type more effectively than conventional methods." As a result, it is possible to filter particles below the pore size and produce a more environmentally friendly filter successfully. "

To do this, the researchers applied nanowires, which were mainly used for transparent electrodes, to existing filter structures. We applied a silver nanowire to the primary fiber network to form a second metal nanowire network. Subsequently, when a voltage is applied to the secondary metal nanowire network, a fine electric field is formed on the surface of the wire, and fine dust particles smaller than the pore size can be efficiently collected by the electric attraction

In addition, it is possible to collect fine dust efficiently with a single filter, and the filter can be cleaned and reused using a solvent, which is convenient, economical and environmentally friendly. In addition, it has a transparent shape and is likely to be used in various fields in everyday life.

Professor Seung Hwan Ko said, "Using the filters developed in this research, ultrafine dust can be effectively removed." He said, "We will take the lead in commercializing environmentally friendly high-efficiency filters to protect the health of the whole nation."

The results of the study were published online on June 13 in Nano Letters (High Efficiency, Transparent, Reusable, and Active PM 2.5 Filters by Hierarchical Ag Nanowire Percolation Network).

The study was funded by the Korea Research Foundation and the Seoul Metropolitan Data Science Institute Project of the Big Data Institute of Seoul.

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