Journal of Iranian Ceramic Society
Journal of Iranian Ceramic Society
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Iran University of Science & Technology , leysohrabi@yahoo.com
Abstract: (161 Views)
Alumina fibers are considered one of the most important and widely used ceramic fibers. Due to the high surface-to-volume ratio of nanofibers, alumina nanofibers can be used as catalyst supports. The fabrication of ceramic fibers using the electrospinning method has remained a challenging topic. The purpose of this study is to utilize aluminum nitrate as an accessible and cost-effective precursor to fabricate alumina nanofibers with the highest possible ceramic-to-polymer precursor ratio in the spinning solution. In this research, polyvinylpyrrolidone (PVP) solutions were mixed with varying ratios of aluminum nitrate solution to investigate their electrospinnability. For this purpose, the weight ratio of aluminum nitrate to PVP in the electrospinning solution was increased from 0.5 to 2, and their electrospinning performance was evaluated. The highest aluminum nitrate-to-polymer weight ratio in the solution, which did not disrupt the electrospinning process, was found to be 1:1. The electrospinning process was conducted at a voltage of 17 kV, a feed rate of 1 ml/h, and a distance of 12 cm between the needle and the collector. Finally, the fiber mat with the highest aluminum nitrate content was dried and calcined at a temperature of 950°C. The fibers were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The XRD results indicated that the alumina fiber phase was gamma-alumina after heat treatment. The micrographs from SEM revealed that the electrospun fibers exhibited good continuity with no noticeable beads before heat-treatment. After heat treatment, the fiber diameter has decreased from approximately 500 nm to below 300 nm, and fiber fragmentation and reduced continuity were observed. Furthermore, FTIR analysis of the fibers demonstrated that, although the intensity of peaks related to the functional groups of polyvinylpyrrolidone decreased after calcination at 950°C, some carbon-related peaks were not eliminated.
Type of Study: Research |
Subject:
Ceramics used in the Environment, Water and Energy
Received: 2024/10/15 | Accepted: 2024/12/29
Received: 2024/10/15 | Accepted: 2024/12/29
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