Electrostatic fiber formation (aka “electrospinning”) has emerged in recent years as one of the simplest and most promising methods for producing long, continuous fibers with diameters less than 1 micron from a wide variety of materials.  Membranes comprised of such fibers are remarkable for their ease of formation, high surface area, and small pore sizes.  As a result, these materials have enjoyed considerable attention in both academia and industry for potential commercial applications in areas ranging from biomedical to energy and the environment.  In this second of two lectures, we will present several applications of electrospun membranes where the unique features of the electrospun material offer particular performance advantages.  Although intended by no means to be exhaustive, examples will be drawn principally from areas of development in the speaker’s laboratory at MIT.  These may include: super-repellent membranes for waterproof, breathable materaials; chemically active membranes for reducing exposure to toxic industrial chemicals or chemical warfare agents; and electrodes for driving chemical reactions.