Influence of media with different acidity on structure of FeNi nanotubes Alena Shumskaya, Egor Kaniukov, Maksim Kutuzau, Victoria Bundyukova, Dinara Tulebayeva, Artem Kozlovskiy, Daryn Borgekov, Inesh Kenzhina and Maxim Zdorovets EPJ Web Conf., 177 (2018) 01003 Published online: 18 April 2018 DOI: 10.1051/epjconf/201817701003