Synthesis of aluminum borate and nickel borate nanoparticles by electrospinning method and investigation of magnetic and photocatalytic properties

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Synthesis of aluminum borate and nickel borate nanoparticles by electrospinning method and investigation of magnetic and photocatalytic properties

ارائه دهنده: Provider: Fatemeh sadat Sajadifar

اساتید راهنما: Supervisors: Dr Hamid Esfahani

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr Mohsen Sheikhi,Dr Mino Karbasi

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: 71

چکیده: Abstract: Today, using nanostructured materials with combined properties for modern applications has particular importance. Aluminum borate and nickel borate nanostructures are suitable for magnetic and photocatalytic applications due to the presence of polar BO3 space groups in their structure. In this study, individual nanoparticles of aluminum borate (AlB), nickel borate (NiB), and aluminum nickel borate (ANB) structures with different amounts of boron were synthesized by electrospinning and post-calcination methods. Microstructural examination of all samples using scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM) showed that fibers with an average diameter of 0.4-1.6 μm were changed to the nanoparticles with an average size of 80-100 nm after calcination at 1000℃. The results of X-ray diffraction (XRD) patterns of the products showed that the AlB sample contained the dominant phase Al18B4O33 and a small amount of Al2O3, while the NiB sample contained Ni3B2O6 and NiO. By changing the amount of boric acid in the electrospinning solution at three levels (0.0154, 0.0309, and 0.0463 g), it was observed that the phases Ni2(AlBO5) and Ni2Al(BO3)O2 were formed, which differed in their composition according to the amount of boron. It was also observed in the microstructure images that with increasing boron, nanoneedles were also added to the structure, which belonged to the phases of aluminum and nickel borate. The magnetic behavior of the nanostructures was investigated using a vibrating sample magnetometer (VSM) test. The results of magnetic hysteresis confirmed the paramagnetic behavior of the nanoparticles. It was also determined that the sample with the highest boron content (ANB-H) had the highest coercivity (Hc) of 1375 Oe. The zeta potential of the nanostructures was measured (-15 mV to -30 mV) and it was observed that all the samples had a negative charge on the surface. The AlB, NiB, and ANB nanostructures were investigated in two separate sections (photocatalytic behavior and hyperthermia treatment ability). The kinetics of the photocatalytic behavior of the nanostructures in the degradation of Rhodamine B showed that the ANB-H sample had the highest efficiency. The rate constant K (relaxation constant) was calculated to be 4.16 h-1, which was approximately 2 times that of the AlB sample. To investigate the ability of the nanostructures in the treatment of hyperthermia, the scaffold Polyvinyl fluoride (PVDF) fibers containing AlB, NiB, and ANB nanostructures were synthesized by the electrospinning method. The amount of β phase in the PVDF matrix was calculated using Fourier transform infrared spectroscopy (FTIR). The highest crystallinity of the β phase was calculated to be 88.3% for the scaffold containing ANB-H. The lowest surface resistance (9.77 kΩ.sq-1) and dielectric constant (12140) were also calculated for the scaffold containing ANB-H. The ability of the nanostructures to treat hyperthermia was investigated using an alternating magnetic field (AMF), and the scaffold containing ANB-H had the highest specific absorption rate (SAR) (1.26 W.g-1) and intrinsic loss factor (ILP) (0.2685 nHm2.Kg-1). The results of this research showed that by adjusting the amount of boron in aluminum and nickel borate nanostructures, successful operations can be achieved in removing organic pollutants using the photocatalytic method and treating cancer using the hyperthermia method.

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