RT Journal Article
ID 640270214d5e1a93
A1 Treshchalov, Aleksei
A1 Tsarenko, Sergey
A1 Avarmaa, Tea
A1 Saar, Rando
A1 Lohmus, Ants
A1 Vanetsev, Alexander
A1 Sildos, Ilmo
T1 He/H2 Pulsed-Discharge Plasma as a Tool for Synthesis of Surfactant-Free Colloidal Silver Nanoparticles in Water
JF Plasma Medicine
JO PMED
YR 2016
FD 2016-09-30
VO 6
IS 1
SP 85
OP 100
K1 alkalization
K1 bipolar discharge
K1 denitrification
K1 electrostatic stabilization
K1 helium
K1 hydrogen
K1 nanoparticle
K1 plasma
K1 plasma-liquid interface
K1 silver
AB In this study we investigated the interaction of atmospheric-pressure helium (He) and He/H2 pulsed-discharge plasma with different water solutions. We developed a synthetic path to obtain fairly uniform, small (~2 nm), surfactant-free silver (Ag) nanoparticles (NPs) with the treatment of an AgNO3 solution with He/H2 bipolar pulsed discharge. The colloidal solutions containing Ag NPs are stable for months and do not show any agglomeration (the measured zeta potential is −41 mV at pH ~8). The adsorption of negatively charged hydroxide (OH−) ions on the surface of Ag NPs could be responsible for the electrostatic stabilization. The treatment of the air-saturated water by pure He plasma with a negative polarity leads to the creation of HNO3 and hydrogen peroxide (H2O2) as stable species. Contrary to the acidification of the solution by He plasma treatment, He/H2 discharge with negative and, in particular, with bipolar pulses produces only traces of HNO3 and no H2O2. We demonstrate here that He/H2 discharge with bipolar pulses is remarkably efficient in near-complete nitrate decomposition and slight alkalization of dilute HN03 and KNO3 solutions.
PB Begell House
LK https://www.dl.begellhouse.com/journals/5a5b4a3d419387fb,2cf1e1a94009b3e1,640270214d5e1a93.html