30㎚~3000㎚ 광범위 직경 입자의 공기역학적 집속에 대한 수치해석
A Numerical Simulation of Aerodynamic Focusing of Nanoparticles in a Wide Range of 30㎚~3000㎚
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초록
Previous designs of conventional aerodynamic lenses have a limitation of narrow range of focusable particle size, e.g. 30 to 300nm or 3 to 30nm. To enlarge the focusable size range to 30‐3000nm, it is necessary to avoid a significant loss of particles larger than 300nm inside the lenses. From numerical simulations on size‐resolved particle trajectories, we confirmed that the traveling losses of such large particles could be avoided only when the radial position of particles approaching the orifice lens was near the lens axis. Hence, we designed the lens system consisting of a converging‐diverging nozzle and 7 orifices to fulfill the requirement. In particular, the orifices were aligned in a way that their diameters were descending and ascending to the downstream. As a result, 30‐2800nm particles can be focused to the particle beam of 0.2mm or less in radius with above 85% transmission efficiency. Even 10μm particles can be focused with 74% of transmission efficiency.
Abstract
Previous designs of conventional aerodynamic lenses have a limitation of narrow range of focusable particle size, e.g. 30 to 300nm or 3 to 30nm. To enlarge the focusable size range to 30‐3000nm, it is necessary to avoid a significant loss of particles larger than 300nm inside the lenses. From numerical simulations on size‐resolved particle trajectories, we confirmed that the traveling losses of such large particles could be avoided only when the radial position of particles approaching the orifice lens was near the lens axis. Hence, we designed the lens system consisting of a converging‐diverging nozzle and 7 orifices to fulfill the requirement. In particular, the orifices were aligned in a way that their diameters were descending and ascending to the downstream. As a result, 30‐2800nm particles can be focused to the particle beam of 0.2mm or less in radius with above 85% transmission efficiency. Even 10μm particles can be focused with 74% of transmission efficiency.
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