Fabrication of various micro/nano structures by modified near-field electrospinning

Abstract

The modified near-field electrospinning (NFES) and the conventional NFES have been compared to demonstrate the viability of direct-writing micro/nano structures from PVDF solution systems. The modified NFES shows good capability in writing various orderly micro/nano patterns, such as straight and continuous lines, parallel lines, arc lines, and beads-on-string structures, whereas the conventional NFES is difficult to give a continuous writing process. Besides, the modified NFES also allows a lower electric field due to the jet initiated in a mechanical way. By finely tuning the key parameters during the modified NFES process, such as the solution property, speed of the movable collector, and the distance between the spinneret and the collector, it is likely to construct complex patterns as required on rigid or flexible substrates for a myriad of applications.

Facile transformation of soot nanoparticles into nanoporous fibers via single-step electrospinning

“…11-13 a Authors to whom correspondence should be addressed: tplei@hqu.edu.cn and cxplum@163.com Electrospinning is a powerful technique for the production of nano/micro scale fibers that have attracted great interest from both academia and industry, because of their unique capacity in solving global issues. 14 Based on past experience on investigations of electrospinning and PVDF polymer, [15][16][17] we demonstrate here for the first time a single-step process to facilely transform candle soots into nanoporous fibers via electrospinning of cocktail of PVDF and candle soots. The specific wettability (hydrophobicity/oleophilicity) of the fibrous membrane is investigated and the superhydrophobic and superoleophilic properties of the membrane are recorded.…”

Current characteristics of various ejection modes in electrohydrodynamic printing

“…Electrohydrodynamic printing (EHDP) is one of the electrohydrodynamic deposition processes which have demonstrated the feasibility of utilizing electric field instead of thermal or acoustic energy to eject micro/nano-sized liquid droplets 1,2 and patterns [3][4][5] from a wide range of functional materials onto substrates in an orderly manner. By reducing the capillary-to-collector distance, EHDP can achieve organized fine patterns with good position control in contrast to other conventional electrohydrodynamic deposition such as electrospin with randomly distributed fiber depositions or electrospray with uncontrolled depositions of droplets.…”

Rheology behaviors of stable electrohydrodynamic direct-write jet

“…The influences of collector velocity on the nanofiber deposition process have been discussed in prior works. 15,16 There was a forces-equilibrium between the electrostatic field force, surface tension and solution viscoelastic stress during process of nanofiber direct-writing. When polymer solution concentration increased from 10% to 20%, the polymer solution viscose increased from 3.8 mPa·s to 96.3 mPa·s.…”

“…11 As a fast, low-cost, direct and precise organic fabrication technology, direct-write meets the development requirement of flexible and organic electronic. 12 By taking the advantage of stable straight region in charged jet, Electrohydrodynamic DirectWrite (EDW) [13][14][15] provides a new way to realize the precise deposition of micro/nano-structures on the flat substrate directly. Both of orderly micro thin film with line width of 1∼100 µm and nanofiber with diameter of 50∼800 nm can be direct-written through EDW under normal temperature and pressure.…”