Self-assembly of macromolecules in a long and narrow tube

Abstract

Many nature materials have hierarchical structure, and its last cascade is always on a molecule scale, e. g., double-stranded DNA, making the hierarchy effective with minimal building blocks. Now artificial hierarchy can begin with a nanoscale level to embody the material with remarkable and fascinating properties which can be never achieved using non-hierarchical structure. A strong desire to fabricate some biomimicking hierarchies from a molecule level has been stimulating scientists. Herein we show that molecular structure can be easily controlled by a long and narrow tube, and self-assembly of macromolecules can be achieved to improve its crystallinity with plenty of excellent properties. We anticipate this paper to be a starting point for more sophisticated fabrication of fibers with self-assembly of macromolecules.

Needle’s vibration in needle-disk electrospinning process: Theoretical model and experimental verification

“…In the spinning process, many parameters: (1) solution parameters such as solution concentration, solution viscosity 24,25 ; (2) spinning parameters, such as voltage supply, ambient humidity; 3) electrodes parameters, such as needle number, needle thickness, affect the spinning process, and nanofiber morphology. [26][27][28] However, except for the parameters above, the vibration of the needle on the disk also plays an important role in the spinning process.…”

An improved homotopy perturbation method for solving local fractional nonlinear oscillators

“…By means of the initial conditions and according to the rule of fractional variational iteration method, we construct the following initial value u 0 x ð Þ for equation (5)…”

“…Most fractional equations are generated by solving specific problems of science and engineering, for example the gas permeability of a nanofiber membrane, [1][2][3][4][5][6] moisture permeability through a cocoon, 7,8 nanoscale multiphase flow, 9 solvent evaporation in the bubble electrospinning, [10][11][12] oscillators arising in microphysics and tsunami motion, 13,14 and sound transmission in hierarchic porous medium that can be exactly modeled by fractional calculus. [15][16][17] There are many fractional derivatives in literature, which are incompatible with each other, among which He's fractional derivative, 15 the local fractional derivative, [18][19][20] the Riemann-Liouville fractional derivative, the Caputo fractional derivative, the Hadamard fractional derivative, and the Atangana-Baleanu fractional derivative 21 are widely used.…”

Effect of surface active agent on bubble-electrospun polyacrylonitrile nanofibers

“…It was probably because bubble formation, deformation and break wasted energy which could make the charged jets move faster during the MBE process, and the nanofiber production decrease [5]. The bubble electrospinning can be used for mass-production of various functional nanofibers [22][23][24][25][26][27][28].…”