Fabrication of PVDF/PES nanofibers with unsmooth fractal surfaces by electrospinning: A general strategy and formation mechanism

Abstract

Smaller fibers are welcome in many applications due to larger surface area, but there is a threshold for smallest fibers for a fixed spinning system. In order to further improve surface area, hierarchical structure is considered in this paper using electrospinning. A bi-solvent system is used in our experiment for fast solvent evaporation. Unsmooth nanofibers are obtained, and the formation mechanism is elucidated.

A colour indicator film based on bromothymol blue/poly‐L‐lactic acid/polyvinylpyrrolidone for detecting bacteria

“…And no significant phase separation was found from the figure, indicating that BTB was uniformly dispersed in the polymer carrier. The colour indicator film was made up of a large number of fibres with a large specific surface area, which helped to increase the responsiveness of the colour indicator film to external changes 17 . On the other hand, the small diameter of the fibres increased the specific surface area of the colour indicator film and improved sensitivity, so BTB‐6‐PLLA‐3‐PVP provided a favourable condition for later indication.…”

Intelligent Nanomaterials for Solar Energy Harvesting: From Polar Bear Hairs to Unsmooth Nanofiber Fabrication

“…The general approaches to fabricating smooth nanofibers are electrospinning ( Gao et al, 2021 ; Liu et al, 2021 ) and bubble electrospinning ( He and Qian, 2022 ; Qian and He, 2022 ). However, Lin, et al, 2021 suggested a general strategy for the fabrication of unsmooth nanofibers. Yao and He (2020 ) used the geometric potential theory to control the surface morphology of nanofibers.…”

Fogs on the Yenisei River (Krasnoyarsk, Russia)

“…When considering different approaches to describing the formation and dissipation of fogs one should mention physico-mathematical models involving the description of turbulent processes. The latter ones are the subject of research in different areas, for example, in modeling solvent evaporation in a moving jet of the spinning process [22,23]. In the problems of describing fog formation above rivers this approach allows modeling wave-like fog patterns along the river accompanied by dissipated whirling columns of fog similar to «steam devils» [24].…”