Synthesis of dense and porous nanofibers by electrospinning

2^nd International Conference and Expo on Ceramics & Composite Materials

July 25-26, 2016 Berlin, Germany

Gideon S Grader

Technion-Israel Institute of Technology, Israel

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

The main goals of this research were morphology and structural control of electrospun ceramic nanofibers. We studied the interplay between the tip to collector distance (TCD), applied potential, precursor viscosity and the fiber diameter distribution. Adjustment of the precursor viscosity by dilution was found to be the useful way to control the fiber diameter in the 100-800 nm range. In a high viscosity sol a transition from a single to a bimodal distribution was observed at an electric field of 0.8 kV cm-1. In a low viscosity sol, a sharp step-like transition from a large to a small fibers diameter regime at the same electric field was occurred. We demonstrate how to control the branching effect to yield either single or bimodal fiber distribution in wide diameter range. The thermal behavior of â�?�?greenâ�? PZT nanofibers was studied by TGA/DTA/DTG analysis coupled with MS. A pre-firing stage at 350oC was found to be necessary to maintain the fiber structure. Sintering of pre-fired fibers was executed in two ways: a long procedure at 650oC for 2 hr and by rapid thermal processing (RTP) at 500-800oC for 30 sec. RTP at 800�?°C provides formation of perovskite phase similar to long sintering with minimal lead loss via evaporation. Finally, the sensing ability of the prepared PZT nanofiber mats was tested under cyclic mechanical loading. In conclusion, the combination of morphology control, pre-firing and RTP might be used as an efficient procedure for dense PZT ceramic nanofibers preparation.

Biography :

Email: grader@technion.ac.il