1. Selection of dust particles in the self-organized dust structures
V.Yu. Karasev
St. Petersburg
State
University

2. The task Parameters of initial particles:
Parameters of levitated particles?

3. Reasonable parameters
Average size - d
And form-factor - f
d = (x + y)/2,
f = x/y
Scale 2.8 мкм

4. Discharge chamber: 1 – moveable diaphragm; 2 – structure in the trap above the tube wall; 3 - structures in the trap in striations; 4 container with powder; 5 device for collection of particle; 6 cathode; 7 anode; 8 tap; 9 magnet.

5. experiment

6. complex shape structures in strata vertical section of double structure

7. Head Te1 and body Te2 of strata

8. Sizes and form-factor distributions of particles ex- tracted from dust trap in striation in kripton,

9. Sizes and form-factor distributions in neon

10. Interpretation of selection in strata in Ne
d=6,5 mkm d=3 mkm
f= f=1
q= e q= e
E=10 V/сm E=3 V/сm
m1g = E1q1,
m2g = E2q2,
q/m=const
selection by f

11. New effect – selection by form-factor discharge plasma intense charging processes in head of strata Te1 (2-4 eV) plasma selected particles f=2 moderate charging processes in body of strata Te2 (1-2 eV) plasma selected particles f=1

12. from Big size to nano particles

13. Thank you for attention

15. New dusty trap, dust structure formed over the bottom wall of the discharge chamber near the current turn

16. 30000 particles, Р = 0.3 Тоr, i = 1.6 мА. Ne, Kr

17. Selection in "dead volume“ of chamber
Kr,
i = 1.6 мА,
Р = 0.3 Тоr.
d = 2.17 mkm

18. dependence of selection parameters on the dimensional factor (volume of dust structure)
d = 2.17 мкм. f 1 – small dust structure
d = 2.35 мкм. f 1.5 – 2. big dust structure