Unipolar discharge phenomena in atmospheric pressure helium plasma generated in a quartz tube

Most of the measurements reported here have been obtained with the 4.5-L CO2 counter previously described (Kiel I; Erlenkeuser, 1965). A few samples have been dated with a 3-L proportional counter. The copper counter is surrounded by 28 GM counters in the form of a double ring. The total assembly is shielded by 10 cm of old lead. Neither an inner lead shield between counter and anticoincidence ring nor screening of sensitive volume by a quartz tube-as in the 4.5-L counter-has been used. Background of the small counter is 17.20 cpm or The 0.95 x NBS value is 9.5 cpm at 400 torr. Within statistical error background does not depend on atmospheric pressure. The 3-L counter is placed under a concrete wall, 2.5 m in length and 9.4 m in height.

Download Full-text

Optical diagnostics of the characteristics of a square unipolar nanosecond pulse-driven atmospheric pressure helium plasma jet

AIP Advances ◽

10.1063/5.0033907 ◽

2020 ◽

Vol 10 (12) ◽

pp. 125218

Author(s):

T. Y. Tang ◽

H. S. Kim ◽

G. H. Kim ◽

B. Lee ◽

H. J. Lee

Keyword(s):

Atmospheric Pressure ◽

Plasma Jet ◽

Optical Diagnostics ◽

Nanosecond Pulse ◽

Helium Plasma

Download Full-text

Dynamics of flow in albumin solution treated by low-temperature atmospheric pressure helium plasma jet

AIP Advances ◽

10.1063/5.0033307 ◽

2020 ◽

Vol 10 (12) ◽

pp. 125216

Author(s):

Tetsuji Shimizu ◽

Hiromasa Yamada ◽

Masanori Fujiwara ◽

Susumu Kato ◽

Yuzuru Ikehara ◽

...

Keyword(s):

Low Temperature ◽

Atmospheric Pressure ◽

Plasma Jet ◽

Helium Plasma ◽

Albumin Solution ◽

Solution Treated

Download Full-text

Deposition of 2‐oxazoline‐based plasma polymer coatings using atmospheric pressure helium plasma jet

Plasma Processes and Polymers ◽

10.1002/ppap.201900104 ◽

2019 ◽

Vol 16 (10) ◽

pp. 1900104 ◽

Cited By ~ 4

Author(s):

Sameer A. Al‐Bataineh ◽

Alex A. Cavallaro ◽

Andrew Michelmore ◽

Melanie N. Macgregor ◽

Jason D. Whittle ◽

...

Keyword(s):

Atmospheric Pressure ◽

Plasma Jet ◽

Polymer Coatings ◽

Plasma Polymer ◽

Helium Plasma

Download Full-text

La pyrolyse de poly(adipate de butylène-1,4)

Canadian Journal of Chemistry ◽

10.1139/v77-381 ◽

1977 ◽

Vol 55 (14) ◽

pp. 2732-2740 ◽

Cited By ~ 2

Author(s):

François Messier ◽

Don C. DeJongh

Keyword(s):

Adipic Acid ◽

Atmospheric Pressure ◽

Quartz Tube ◽

Heated Zone ◽

Volatile Products

Poly(1,4-butylene adipate) (1) was pyrolyzed in a porcelain boat placed in a quartz tube heated by a furnace. Volatile products were carried out of the heated zone into traps by a flow of nitrogen. Polyester 1 was pyrolyzed both near the entrance and near the exit of the heated zone, at 500 and 700 °C with and without a vacuum. Adipic acid (2), cyclopentanone (4), and a mixture of mono (5) and diesters (6) of the monomer, dimer, and trimer, were isolated as products of the pyrolyses.The pyrolyses of 1 at 500 °C near the exit of the heated zone at atmospheric pressure gave 14% of 2, 10% of 4, 40% of 5, and 18% of 6; 5 consisted of 26% monoester of monomer and 74% monoester of dimer, whereas 6 consisted of 63% diester of monomer and 37% diester of dimer. At 700 °C, 0.2–0.3 Torr, with 1 near the entrance of the heated zone, the yield of 2 was higher (∼35%), and trimers were found in the monoesters 5 and diesters 6, along with dimers and monomers.

Download Full-text