Fig. 8From: Design and preparation of Fe3O4@PVA polymeric magnetic nanocomposite film and surface coating by sulfonic acid via in situ methods and evaluation of its catalytic performance in the synthesis of dihydropyrimidinesN2 adsorption–desorption isotherm of: a isotherm linear plot, b BET surface area plot and c BJH adsorption of pore-size distribution curve of Fe3O4@PVA-SO3HBack to article page