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215 results on '"Saeed, Abdu"'

3. Incorporated Ti[O.sub.2] nanoparticles into PVC/PMMA polymer blend for enhancing the optical and electrical/dielectric properties: Hybrid nanocomposite films for flexible optoelectronic devices

Author

Muntaser, A. Al-, Abo-Dief, Hala M., Tarabiah, A.E., Alzahrani, Eman, Alsalmah, Hessa A., Alharbi, Zeinab M., Pashameah, Rami Adel, and Saeed, Abdu

Subjects
Founding -- Usage -- Analysis, Polymethylmethacrylate -- Usage, Electrical conductivity -- Usage -- Analysis, Polyvinyl chloride -- Usage, Nanoparticles -- Analysis -- Usage, Dielectrics -- Analysis -- Usage, Engineering and manufacturing industries, Science and technology
Abstract

In the present work, sol-gel-synthesized titanium oxide nanoparticles (Ti[O.sub.2] NPs) were added to polyvinyl chloride (PVC) and polymethyl methacrylate (PMMA) to create polymer nanocomposites (PNCs) samples. The preparation was carried out via the solution casting method. The synthesized Ti[O.sub.2] NPs have a tetragonal anatase phase and an average grain size of 15.7 nm. XRD analysis reveals that the Ti[O.sub.2] NPs' addition to PVC/PMMA causes a decrease in the crystallinity of PNCs films. Infrared Fourier analysis demonstrated the interplay/complexity between the PVC/PMMA blend and Ti[O.sub.2] NPs. The UV/visible spectrum of the PVC/PMMA blend showed two absorbance peaks at 278 and 208 nm, which may result from the n [right arrow] [[pi].sup.*] and [pi] [right arrow] [[pi].sup.*] transitions. Also, optical bandgaps for indirect and direct allowed transitions decreased with increasing Ti[O.sub.2] NPs concentration. The samples' AC electrical conductivity and dielectric properties were measured at room temperature. As the Ti[O.sub.2] NPs content in the nanocomposite rises, a percolating network begins to emerge inside the composite, demonstrating that AC electrical conductivity obeys Jonscher's law. Additionally, it has been demonstrated that nanoparticle concentration leads to a higher composite dielectric loss and dielectric constant. These findings suggest the possibility of using the prepared nanocomposites in capacitive energy storage and optoelectronic devices. Highlights * PVC/PMMA-Ti[O.sub.2] nanocomposites' films were fabricated via the solution casting method. * Adding Ti[O.sub.2] NPs to PVC/PMMA reduces the crystallinity of the PNCs films. * The allowed direct and indirect bandgaps decreased with rising Ti[O.sub.2] NPs content. * AC conductivity, impedance, and dielectric characteristics were discussed. * The findings indicate the use of prepared samples in optoelectronic devices. KEYWORDS dielectric functions, optoelectronic devices, PMMA, PVC, Ti[O.sub.2] NPs, 1 | INTRODUCTION Nanomaterials are a crucial part of the industrial revolution and have the potential to be employed in the manufacture of technologically advanced, highly efficient, affordable, and energy-efficient [...]

Published
2023
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44. CoFe2O4/PANI/MWCNTs ternary hybrid composites. Synthesis, characterization, the effect of MWCNTs ratio and dye removal capability.

Author

Gabal, Mohamed A., Al-Mutairi, Ebtesam, Al Angari, Yaser M., Salam, Mohamed Abdel, Awad, Ayman, Al-Juaid, Amani A., and Saeed, Abdu

Subjects
HYBRID materials, DYES & dyeing, MULTIWALLED carbon nanotubes, TRANSMISSION electron microscopy, ADSORPTION kinetics, ENVIRONMENTAL remediation, OXYGEN carriers
Abstract

We have synthesized cobalt ferrite (CoFe2O4) using the sucrose auto-combustion method and subsequently employed the in situ polymerization technique to fabricate ternary composites comprising CoFe2O4, polyaniline (PANI), and multi-walled carbon nanotubes (MWCNTs). In this novel investigation, we explored the influence of varying MWCNTs ratios on these composites' structural, magnetic, thermal, and electrical properties. The crystal structures of the synthesized composites were analyzed using X-ray diffraction (XRD), while Fourier transform infrared (FT-IR) spectroscopy revealed changes in bonding patterns, including the disappearance of ferrite bonds and the emergence of new ones. Transmission electron microscopy (TEM) images illustrated a complete coating of PANI on both MWCNTs and CoFe2O4 particles, resulting in a substantial reduction in magnetization compared to pure CoFe2O4 ferrite due to PANI's nonmagnetic nature. Vibrating sample magnetometer (VSM) measurements confirmed this reduction, indicating a decrease to 7.3 emu.g−1. Thermal analysis demonstrated an enhancement in thermal stability with increasing MWCNTs content, as evidenced by an increase in the temperature equivalent for half decomposition (T50) from 486 to 522 °C for composites with 40% MWCNTs. Moreover, the electrical conductivity showed a corresponding rise with MWCNTs content, increasing from 3.1 × 10−3 Ω−1.cm−1 to 2.2 × 10−2 Ω−1.cm−1, possibly indicating charge transfer from PANI to MWCNTs. To assess practical applications, we investigated the ability of the composite with 40% MWCNTs to remove phenol red (PR) dye from aqueous solutions. Through a systematic study of adsorption parameters and kinetics, we determined optimal conditions for effective dye removal and elucidated the underlying adsorption mechanism. Our results demonstrated the composite's efficiency in dye removal, with a 6.4 mg·g−1 capacity for PR dye, highlighting its potential for environmental remediation efforts. [ABSTRACT FROM AUTHOR]

Published
2024
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