Gordon Eugene B, Karabulin Alexander V, Kulish Mikhail I, Matyushenko Vladimir I, Stepanov Maxim E
Institute of Problems of Chemical Physics RAS , 1 Semenov avenue, 142432 Chernogolovka, Moscow Region, Russia.
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) , 31 Kashirskoe Highway, 115409 Moscow, Russia.
J Phys Chem A. 2017 Dec 7;121(48):9185-9190. doi: 10.1021/acs.jpca.7b08645. Epub 2017 Nov 29.
The thermal emission study in this work has shown that coagulation of metals in liquid helium is accompanied by enormous local overheating of several thousand degrees. Direct experiments demonstrated, for the first time, that condensation of metals in superfluid helium occurs via the specific mechanism which is substantially faster than that in normal liquid helium. It has been stated that coagulation of metals in superfluid helium indeed occurs in two stages, a "hot" one of nanoparticles coalescence with the formation of molten nanospheres and the subsequent stage of their sticking together into nanowires. It turned out that if a laser ablation of metal targets immersed in superfluid helium was used for introducing a metal into liquid, the formation of nanowires occurs at distances of only about 1 mm from the laser focus. This leads to the presence of a considerable number of spherical inclusions in nanowires grown in such a way.
