Application of photochemical ultrafine aerosol particles generators for SMPS and DB size resolution testing

Investigation of Aerosol Formation During Benzaldehyde Photolysis

“…These kinds of size distributions are typical for the coagulation growth of the particles in the presence of evaporation. A similar type of size distribution has been experimentally observed earlier for the photochemical aerosol formation of various organics. , Similar bimodal distributions were obtained in the numerical modeling of photochemically induced aerosol formation . An increase in the mean particle diameter with irradiation time results from a decrease in the fraction of the small mode (Figure ), while the modal diameter is almost constant with t phot when t phot is larger than 3.5 s. The aerosol mass, calculated from the aerosol particle volume assuming that the density of particle material is 1 g/cm 3 , increases linearly with an increase in irradiation time.…”

“…19 When the aerosol particle fractions have narrow size distribution (standard geometric deviation σ g ) 1.1-1.2), they can be resolved when R value is larger than 1.4. 20 The accuracies of determination of the mean arithmetic (D a ) and mean volume (D v ) diameters are (7 and (15% for D a and D v , respectively, as confirmed by comparing the results with those obtained using transition electron microscopy 21 and a TSI scanning mobility particle sizer model 3071. 20 The flow of BA vapor (Q 1 ) 0.1 L/min) is prepared by passing the carrier gas through the U-shaped tube filled with silica, impregnated with liquid BA (2).…”

“…This inversion procedure was shown to reconstruct correctly multimodal size distributions and to resolve aerosol fraction with different size as separate peaks when the ratio of the mean diameters of fractions R = / is larger than 2.5 . When the aerosol particle fractions have narrow size distribution (standard geometric deviation σ g = 1.1−1.2), they can be resolved when R value is larger than 1.4 . The accuracies of determination of the mean arithmetic ( D a ) and mean volume ( D v ) diameters are ±7 and ±15% for D a and D v , respectively, as confirmed by comparing the results with those obtained using transition electron microscopy 21 and a TSI scanning mobility particle sizer model 3071 …”

“…When the aerosol particle fractions have narrow size distribution (standard geometric deviation σ g = 1.1−1.2), they can be resolved when R value is larger than 1.4 . The accuracies of determination of the mean arithmetic ( D a ) and mean volume ( D v ) diameters are ±7 and ±15% for D a and D v , respectively, as confirmed by comparing the results with those obtained using transition electron microscopy 21 and a TSI scanning mobility particle sizer model 3071 1 Schematic of the experimental set-up: (1) cylinders with compressed O 2 and N 2 with flow controllers; (2) U-shaped tube with BA; (3) bubbler with H 2 O; (4) flow reactor; (5) slit; (6) UV-lamp; (7) diffusion battery; (8) condensation enlarger; (9) aerosol particle counter; (10) controller; (11) PC. …”

Determination of Mechanical Characteristics of Nanoscale Particles by Deposition in a Screen-Type Diffusion Battery

“…Экспериментальные исследов ия выполнены на установке, блок-схема которой представлена на рис. 1.В опытах были использованы аэрозоли йодбензола, оксида молибдена и оксида вольфрама, которые получали с помощью фотохимического (йодбензол, оксиды молибдена и вольфрама) и термоконденсационного (оксид вольфрама) аторов ультратонких аэрозолей[9]. енераторы позволяли получать ультратонкий аэрозоль со стандартным геометрическим отклонением от 1.5 до 2 в диапазоне размеров частиц от 3 до численной концентрацией на входе батареи до 1 для частиц 20 нм и концентрацией до 7⋅102 см -3 для частиц диаметром исперсный аэрозоль пропускался через электростатический класс стиц с длиной коллектора 0.1111 м (модель TSI EC разделял частицы на узкие фракции со стандартным геометрическим отклон Далее аэрозоль поступал в диффузионную батарею сето ного типа (модель TSI 3041), которая представляет собой цилиндрическ Блок-схема экспериментальной установки 169 (9) частице и поверхности, соответствен-Используя понятие критической скорости, эффективность адгезии можно определить, как отношение числа аэрозольных частиц, скорость которых к общему числу частиц в системе.…”