High temperature transformation of electrospun BaZrO3 nanotubes into nanoparticle chains

Abstract

Postprint (published version

Electrospinning of gelatin fibers using solutions with low acetic acid concentration: Effect of solvent composition on both diameter of electrospun fibers and cytotoxicity

“…Electrospinning was performed in a home‐engineered device . Each gelatin solution was loaded into a 2.5 mL syringe with a stainless steel syringe needle (0.6 mm inner diameter) connected as an anode to a high‐voltage power supply.…”

Epitaxial BaZrO3 tracks by electrospinning of metalorganic fibers on single crystals

“…2a shows an AFM topographic image of a typical track in the sample treated at 600 uC, where all the organics have been removed and only nanocrystalline barium zirconate should remain. 27 The continuous character of the tracks should be highlighted. The height and width of the tracks presents some waviness since some roughness can be clearly observed at the surface.…”

“…2b) but flattened with respect to a semicircle as its aspect ratio would lie around 10 : 3 for this particular fiber. Since the fiber shape was shown to be cylindrical during the electrospinning process, 27 this means that the fiber is severely deformed at some undetermined step. Likely causes could be substrate wetting of the fiber being deposited, which may not be completely dried, or deformation by plastic flow during the heat treatment and before the thermal decomposition of the PVP starts.…”

“…The preparation of the solution is described elsewhere. 27 Basically, barium acetate (Fluka) and zirconium 2,4-pentadionate (Alfa Aesar) are dissolved in glacial acetic acid (Panreac). Total metal concentration is 0.25 M. Afterwards, polyvinylpyrrolidone (PVP) with M w = 1.3 6 10 6 (Alfa Aesar) is added in 10% w/v concentration in order to increase viscosity to y600 mPa s.…”

“…To the best of our knowledge, this is the first time this has ever been reported. In a previous article, 27 the same BaZrO 3 (BZO) precursor solution was electrospun in the form of a fiber mat and its thermal evolution studied. However, in this latter case no template was employed so that the entangled fibers were not in close contact with the substrate and therefore they were not so restricted to movement as in the present system.…”