Large-Scale Production of Aligned Long Boron Nitride Nanofibers by Multijet/Multicollector Electrospinning

Abstract

Boron nitride nanofibers (BNNFs) with alignment and large length have been prepared on a large scale by electrospinning the precursor fibers and subsequent nitridation. A multijet/multicollector electrospinning system is constructed by simply arranging three jets and three tip collectors abreast. By this system the aligned precursor fibers with lengths over 13 cm are collected throughout a very large length of 68 cm. The alignment of the electrospun precursor fibers is mainly induced by the converging electric field generated by the applied tip collectors. Composite B 2 O 3 /polyvinylbutyral (PVB) fibers (BOFs) were used as the precursor fibers, where PVB was added for increasing the spinnability of the electrospinning solutions. However, the presence of PVB in the BOFs results in the formation of carbon residue in the nitrided products, which is a stubborn problem for preparing the BNNFs. We successfully solved this problem by introducing a small amount of O 2 at appropriate temperature during nitridation with NH 3 . The morphology of the nitrided products is strongly dependent on the diameter and B 2 O 3 /PVB ratio of the BOFs and the BNNFs with diameters as small as below 100 nm were obtained by controlling them. The obtained BNNFs were crystallized with (002) base planes preferentially oriented in parallel to the fiber axis. A high onset oxidation temperature of 890 °C was demonstrated for the BNNFs.

Blow-assisted multi-jet electrospinning of poly-L-lactic acid nanofibers

“…Another modification by additional electrodes in multi-jet process was an auxiliary electrode. Placed in parallel to the collector, either supporting the nozzles [15,22], or working as additional collector [23], the auxiliary electrode controls the electric field uniformity in the multi-jet electrospinning process. Tomaszewski and Szadkowski, and Yang et al suggested that appropriate nozzles distribution in multi-jet electrospinning system facilitates collecting process of nanofibers [24,25].…”

Electrospinning of ceramic nanofibers: Fabrication, assembly and applications

“…Electrospinning technique can also be used for fabricating nanofibers composed by non-oxide ceramics including carbide, boride, nitride, silicide and sulphide [38,50,[79][80][81][82][83][84][85][86][87]. Wu et al synthesized nitride nanofibers via electrospinning for the first time [50].…”

Phosphine-functionalized electrospun poly(vinyl alcohol)/silica nanofibers as highly effective adsorbent for removal of aqueous manganese and nickel ions

“…Such promising materials include mesoporous silica, mesoporous carbon, nanocarbon, and nanofiber [6][7][8][10][11][12][13][14]. Increases in surface area and surface functionalization of adsorbents with desired functional groups can increase the adsorption rate of heavy metals [15][16][17][18][19][20]. Due to their high adsorption capacity , nanoporous nanofibers are considered to be efficient adsorbents for removing heavy metals and organic pollutants from water [6,7,11,[18][19][20][21][22][23][24].…”