Destabilization of the hard coal microstructure by a weak electric field Oleksandr Molchanov, Dmytro Rudakov, Valerii Soboliev and Oleksii Kamchatnyi E3S Web Conf., 60 (2018) 00023 Published online: 16 October 2018 DOI: 10.1051/e3sconf/20186000023