Filamentation of diamond nanoparticles treated in underwater corona discharge

0458854 - FZÚ 2017 RIV GB eng J - Journal Article
Jirásek, Vít - Lukeš, Petr - Kozak, Halyna - Artemenko, Anna - Člupek, Martin - Čermák, Jan - Rezek, Bohuslav - Kromka, Alexander
Filamentation of diamond nanoparticles treated in underwater corona discharge.
RSC Advances. Roč. 6, č. 3 (2016), 2352-2360. E-ISSN 2046-2069
R&D Projects: GA ČR GA15-01687S; GA MŠMT(CZ) LD14011
Institutional support: RVO:68378271 ; RVO:61389021
Keywords : nanodiamonds * pulsed streamer corona discharge * filamentation
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.108, year: 2016

Diamond nanoparticles (DNPs) with a nominal diameter of 5 nm were treated using underwater pulsed streamer corona discharge. A reactor with a needle-to-plate electrode system was employed. The electrolytic conductivity of aqueous DNPs suspensions (0.37 g l-1) was adjusted by NaCl to 100 and 500 mS cm-1. The discharge-treated particles predominantly formed several mm long filaments consisting of agglomerates with submicron diameter, independent of the solution conductivity and the treatment time. The treatment of DNPs decreased the sp2-bonded carbon atoms, as evaluated by XPS for more conductive solution. For both solutions, oxidation of the DNP surface was observed. FTIR measurements showed evolution of new bands at 800–950 cm-1 and 1261 cm-1, which were attributed to the formation of epoxides via the attack of HO2 radicals on surface C=C double bonds.
Permanent Link: http://hdl.handle.net/11104/0259079