Sampling Artifacts from Conductive Silicone Tubing Page: 4 of 31
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Sampling Artifacts from Conductive Silicone Tubing
84 i.d. for stainless steel tubing). For the conductive silicone and stainless steel tubing,
85 penetration is greater than 90% for particles between about 50 and 200 nm and drops
86 rapidly for particles smaller than 50 nm. The predicted penetration agrees exceptionally
87 well with that observed for all particle sizes considered, provided that the tubing is
Particle Diameter (nm)
Figure 1. Fractional penetration (transmission) of size selected soot particles through test
sections of stainless steel, conductive silicone, and polyvinyl chloride tubing. Fractional
penetration is nearly identical for stainless steel, and conductive silicone tubing.
Electrostatic losses in the non-conducting polyvinyl chloride tubing greatly reduce
particle transmission. The penetration calculated for conductive tubing is shown for
reference. Calculated penetration includes losses due to diffusion and inertia (settling),
but not electrostatic losses. Conditions: 50 SLPM flow rate, 1.27 cm i.d. tubing, 50m
tubing length, 25 C, 1 bar pressure.
conductive. The much lower particle penetration shown in Figure 1 for polyvinyl
100 chloride (PVC) tubing is likely due to electrostatic losses. Typical application of
101 conductive silicone tubing for particle counting instrumentation (e.g. condensation
- N N polyvinyl chloride
- N v stainless steel -
A conductive silicone
N - calculated transmission .
+ . AA i . . . . ,. . . . N . . .+
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Timko, Michael T.; Yu, Zhenhong; Kroll, Jesse; Jayne, John T.; Worsnop, Douglas R.; Miake-Lye, Richard C. et al. Sampling Artifacts from Conductive Silicone Tubing, article, May 15, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc926147/m1/4/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.