title: Free films. I. Apparatus and preliminary evaluation.
mesh_terms: D000085:Acetates; D002482:Cellulose; D002627:Chemistry, Physical / Q000295:instrumentation; D004548:Elasticity; D005069:Evaluation Studies as Topic; D008567:Membranes, Artificial; D008722:Methods; D010539:Permeability; D010825:Physics / Q000295:instrumentation
chemical_list: D000085:Acetates; D008567:Membranes, Artificial; D002482:Cellulose