Direct observation of photo-mechanical stiffness in alkanethiol-capped gold nanoparticles supracrystals by ultrafast small-angle electron diffractionGiulia F. Mancini, Francesco Pennacchio, Tatiana Latychevskaia, Javier Reguera, Francesco Stellacci and Fabrizio CarboneEPJ Web Conf., 205 (2019) 04004DOI: https://doi.org/10.1051/epjconf/201920504004