![\"r-07-1\"](\"\/metinanoen\/wp-content\/uploads\/sites\/17\/2021\/10\/r-07-1.png\")
<\/a><\/p>\nFigure\u2461(d)-1\u00a0Standpoint of the aerosol-to-liquid collection method in the hazard assessment of nanomaterials<\/p>\n
Main results:
\nWe developed a technique for directly collecting dry-dispersed nanomaterials into liquid. Two essential elements of this aerosol-to-liquid-collection-method are (1) dry-dispersion technique to aerosolize nanomaterial with high temporal stability and (2) a technique to efficiently collect aerosolized nanomaterial-aggregates in liquid.<\/p>\n
With respect to (1), we improved a vibrating membrane aerosol generator of NIOSH-type USA and demonstrated that P25 TiO2<\/sub> could be aerosolized steadily for extended periods at mass concentration of \u226510 mg\/m3<\/sup> (Figures \u2461(d)-2(a) and \u2461(d)-3(a)).<\/p>\n With respect to (2), we uses a condensation particle trap (CPT). Inside the CPT super-saturated water vapor nucleate and condense to aerosolized nanomaterial aggregates, growing them into droplets whose diameter are approximately 3 \u03bcm. At the exit of CPT, grown droplets were accelerated through nozzles and deposited by inertia onto a liquid surface. (Figure 2(b)). We demonstrated that P25 TiO2<\/sub> suspension was successfully prepared by this method. By carrying out 5 to 6 hours of aerosol-to-liquid-collection method, it is possible to prepare a liquid suspension of the TiO2<\/sub> with concentration of 1 mg\/mL and the volume of 5-10 mL (Figure 3(b)).<\/p>\n