Thesis-2011-Liu.pdf (10.05 MB)
Generation and characterisation of cold atmospheric liquid-containing plasmas
thesis
posted on 2011-01-17, 12:16 authored by Jingjing LiuThis thesis presents an experimental study of non-thermal atmospheric
pressure gas plasmas in presence of liquid as an efficient source of transient and
reactive species to initiate chemical reactions necessary for many important
applications. Two types of liquid-containing plasmas are considered: discharges
formed between a needle electrode and a liquid electrode, and plasma jets
formed in a water vapour flow mixed in helium or argon gas. Two plasma modes
(the pulsed and the continuous mode) are observed in the needle-to-liquid
plasma. A comparative study of the needle-to-liquid plasma in the continuous
mode with DC and AC excitations reveals that the plasmas are glow discharges,
and AC excited plasmas have the highest energy efficiency. A study of
helium/water vapour plasma jet shows that “plasma bullets” are formed even with
water vapour in the gas mixture, but become quenched when the moist helium
flow rate is above 300sccm (~1800ppm water concentration). Moderate amount
of water vapour (~250ppm water concentration) is beneficial for active species
production mainly due to the high electron density. Hydrogen peroxide
production in saline solution with three different plasma sources is investigated
due to the importance of H2O2 in several important applications. Long lifetime of
H2O2 in the liquid after plasma treatment indicates an exciting possibility of
plasma pharmacy.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Publisher
© Jingjing LiuPublication date
2011Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.564389Language
- en