Diffusion Anisotropy of Gaseous Helium-3 in Ordered Aerogels at Low Temperatures.

We report on the first observation of diffusion anisotropy of gaseous helium-3 entrapped in ordered aerogels at 4.2 K. The origins of He diffusion anisotropy in aerogels of different porosity are discussed.

Reply to 'Comment on "Angstrom-scale probing of paramagnetic centers location in nanodiamonds by He NMR at low temperatures"' by A. Shames, V. Osipov and A. Panich, Phys. Chem. Chem. Phys. 2018, 20, DOI.

Shames et al. made a comment on our article (DOI: 10.1039/C7CP05898E) stating that their experience in EPR studies of detonation nanodiamonds suggests the existence of two main types of paramagnetic center in detonation nanodiamonds which questions our results.

Angstrom-scale probing of paramagnetic centers location in nanodiamonds by He NMR at low temperatures.

In this article a method to assess the location of paramagnetic centers in nanodiamonds was proposed. The nuclear magnetic relaxation of adsorbed He used as a probe in this method was studied at temperatures of 1.5-4.

Helium-3 gas self-diffusion in a nematically ordered aerogel at low temperatures: enhanced role of adsorption.

We performed He gas diffusion measurements for the first time in a highly porous ordered AlO aerogel sample at a temperature of 4.2 K using a nuclear magnetic resonance field gradient technique. A strong influence of He adsorption in the aerogel on self-diffusion is observed.