J. colloid interface sci. J. colloid interface sci. The fabrication of ultrathin films and their gas separation performance from polymers of intrinsic microporosity with two-dimensional (2D) and three-dimensional (3D) chain conformations Benito J. Vidal J. Sánchez-Laínez J. Universidad de Zaragoza Zornoza B. Téllez C. Universidad de Zaragoza Martín S. Universidad de Zaragoza Msayib K.J. Comesaña-Gándara B. McKeown N.B. Coronas J. Universidad de Zaragoza Gascón I. Universidad de Zaragoza 2019 research-article