Fabrication of well-aligned electrospun nanofibrous membrane based on fluorinated polyimide

Fabrication and electrolyte characterization of uniaxially-aligned anion conductive polymer nanofibers

We report the anion transport properties of anion conductive polymer nanofibers fabricated using an electrospinning method. The aligned nanofibers were prepared to evaluate the anion conductivity of the nanofibers. The aligned nanofibers had 10-15 times higher conductivity (up to 160 mS cm^-1 at 90 °C and 95%RH) and lower activation energy (23-25 kJ mol^-1) than the corresponding membranes, even though the nanofibers showed lower water uptake than the corresponding membranes. The anion conductivity measurement of nanofibers with different IEC values and anion species revealed that the dependency of anion conductivity on these factors was smaller in the nanofibers than in the corresponding membranes. These results indicate that effective ion transport pathways were formed in the nanofibers due to the phase separation and the polymer chain orientation along the nanofiber axis. These nanofibers are expected to be useful for future applications in alkaline fuel cells, air batteries, and other energy- and environment-related devices regardless of the ion species.

Ultra-high proton conduction in electrospun sulfonated polyimide nanofibers

Uniaxially-aligned sulfonated polyimide nanofibers fabricated by an electrospinning method showed ultra-high proton conductivities due to molecular orientation in the nanofibers.

Carbon nanofibers prepared via electrospinning

Carbon nanofibers prepared via electrospinning and following carbonization are summarized by focusing on the structure and properties in relation to their applications, after a brief review of electrospinning of some polymers. Carbon precursors, pore structure control, improvement in electrical conductivity,and metal loading into carbon nanofibers via electrospinning are discussed from the viewpoint of structure and texture control of carbon.

Collection method for extra aligned nanofibers deposited by electrospinning

Electrospinning is a very promising nanotechnology method, mostly thanks to industrial scale up ability, relatively low purchase cost, and huge variability. Nevertheless, its principal disadvantage is the way in which the individual nanofibers are randomly deposited while being collected onto a collector after passing through the chaotic whipping phase. Present and future applications of nanomaterials will need their precise, ordered intrinsic structures, or may even require accurately determined anisotropic properties because of significant improvement of material properties such as mechanical, electronic, optical, etc. This work demonstrates a novel and advanced collector including a sliding board mechanism. The resulting nanofibrous materials obtain extremely high orientation order parameter (S > 97%). Other important advantages of this technological method are discussed here in more detail.