Generation and delivery of free hydroxyl radicals using a remote plasma

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F23%3A00363592" target="_blank" >RIV/68407700:21230/23:00363592 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1088/1361-6595/acb07f" target="_blank" >https://doi.org/10.1088/1361-6595/acb07f</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6595/acb07f" target="_blank" >10.1088/1361-6595/acb07f</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Generation and delivery of free hydroxyl radicals using a remote plasma

Popis výsledku v původním jazyce

We demonstrate a new gas-based O H * generation source using a low power radio frequency driven atmospheric pressure plasma configured to deliver the radical flux into the far effluent region, well away from interference from other plasma factors such as electric fields, currents, and ultraviolet radiation. Using He-H2O gas chemistry isolated from the laboratory air, the plasma generated flux contains O H * and other radicals including, O and HO2 as well as H2O2 which, along with, was found to vary with H2O vapour content and absorbed power density. Peak flux values were 2.3 nmol s-1 and 0.23 nmol s1 for H2O2 and O H * respectively at a distance of 50 mm from the plasma, with 790 ppmv H2O and a power density of ~108 W m-3. The maximum O H * flux density was 4.5 x 1019 m-2s-1 falling to 1.7 x 1019 m2 s1 at 110 mm, equivalent to generation rates of 74 µM s1 and 28 µM s-1. Despite high O H * recombination rates at the plasma exit, the escaping flux is still significant, indicating a viable delivery capability to downstream targets. Its performance with regard to O H * generation rates compares well with traditional O H * generation techniques such as radiolysis, advanced oxidation processes and enhanced Fenton-chemistry approaches where O H * production rates are sub-µM s-1. Delivering precisely quantifiable O H * fluxes provides new opportunities for scientific studies and technological opportunities in cell biology, atmospheric chemistry, protein unfolding and systematic dose studies for plasma-based and other O H * related potential medical treatments.

Název v anglickém jazyce

Generation and delivery of free hydroxyl radicals using a remote plasma

Popis výsledku anglicky

We demonstrate a new gas-based O H * generation source using a low power radio frequency driven atmospheric pressure plasma configured to deliver the radical flux into the far effluent region, well away from interference from other plasma factors such as electric fields, currents, and ultraviolet radiation. Using He-H2O gas chemistry isolated from the laboratory air, the plasma generated flux contains O H * and other radicals including, O and HO2 as well as H2O2 which, along with, was found to vary with H2O vapour content and absorbed power density. Peak flux values were 2.3 nmol s-1 and 0.23 nmol s1 for H2O2 and O H * respectively at a distance of 50 mm from the plasma, with 790 ppmv H2O and a power density of ~108 W m-3. The maximum O H * flux density was 4.5 x 1019 m-2s-1 falling to 1.7 x 1019 m2 s1 at 110 mm, equivalent to generation rates of 74 µM s1 and 28 µM s-1. Despite high O H * recombination rates at the plasma exit, the escaping flux is still significant, indicating a viable delivery capability to downstream targets. Its performance with regard to O H * generation rates compares well with traditional O H * generation techniques such as radiolysis, advanced oxidation processes and enhanced Fenton-chemistry approaches where O H * production rates are sub-µM s-1. Delivering precisely quantifiable O H * fluxes provides new opportunities for scientific studies and technological opportunities in cell biology, atmospheric chemistry, protein unfolding and systematic dose studies for plasma-based and other O H * related potential medical treatments.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Plasma Sources Science and Technology

ISSN

0963-0252

e-ISSN

1361-6595

Svazek periodika

32

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

—

Kód UT WoS článku

000919882700001

EID výsledku v databázi Scopus

2-s2.0-85147142173