الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
A novel contribution to the development of a new core-shell nanocomposites based on titanium dioxide nanoparticles and terpoly(aniline, anthranilic acid, and o-phenylenediamine) which were successfully synthesized by an in situ oxidative procedure upon aniline, anthranilic acid, and o-phenylenediamine in a molar ratio of 2:2:1, respectively and various percentages of TiO2 nanoparticles (10 wt. %, 20 wt. %, 30 wt. %, and 50 wt. %) using potassium dichromate (Scheme 6).
The bare PANI-AA-o-PDA EB and TiO2@PANI-AA-o-PDA EB core-shell nanocomposites were characterized by FT-IR, which was inferred that the o-PDA had been introduced into the terpolymer backbone successfully. The TGA thermograms of the pristine terpolymers and TiO2@PANI-AA-o-PDA core-shell nanocomposites illustrated the insertion of TiO2 into the terpolymer matrix. This was proven by enhancing the thermal stability of the nanocomposites during the thermal decomposition process of the composites under non-oxidative condition.
The core-shell feature of the nanocomposites was confirmed by TEM micrographic of TiO2@PANI-AA-o-PDA EB core-shell nanocomposites which was recorded at different magnification power and revealed that our newly synthesized core-shell nanocomposites are roughly spherical with a core-shell structure in the nanosized scale. The mean core size is 18 nm, and the shell size is between 15 nm and 22 nm. Furthermore, the addition of high ratio of the TiO2 nanoparticles was found to lower the electrical resistivity and consequently, elevate the electrical conductivity.
from DLS results the zeta potential is suggesting rapid coagulation or flocculation, incipient instability, and moderate stability, y-intercepts with signals values of 0.933, 0.932, and 0.917, is suggesting one of the best systems, and PDI values of 0.359, 0.248, and 0.257, respectively being lower than 0.7, suggesting the narrow distribution of nanoparticle sizes. Therefore, our system considered to have moderate stability, to be one of the best systems, and to have narrow PDI.
A recent involvement in the evolution and production of novel core-shell nanocomposites composed of nanosized titanium dioxide and aniline-o-phenylenediamine copolymer, which were successful and chemically synthesized by an in situ oxidative procedure upon aniline, and o-phenylenediamine in a molar ratio of 5:1, respectively and several weights of TiO2 nanoparticles, 10 wt. %, 20 wt. %, 30 wt. %, 40 wt. %, and 50 wt. % using potassium dichromate (Scheme 7). The original PANI-o-PDA EB and TiO2@PANI-o-PDA EB core-shell nanocomposites were characterized by FT-IR, which was revealed that the o-PDA had been introduced into the copolymer backbone successfully. The TGA thermograms of the pristine copolymers and TiO2@PANI-o-PDA core-shell nanocomposites illustrated the insertion of TiO2 into the copolymer matrix. This was proven by enhancing the thermal stability of the nanocomposites during the thermal decomposition process of the nanocomposites under the non-oxidative condition.
The core-shell feature of the nanocomposites was confirmed by TEM micrographic of TiO2@PANI-o-PDA EB core-shell nanocomposites, which was recorded at different magnification power and implied that our newly synthesized core-shell nanocomposites are roughly spherical with a core-shell structure in the nanosized range of 17-26 nm. Furthermore, the addition of high ratio of the TiO2 nanoparticles was found to lower the electrical resistivity and increase the electrical conductivity. Photocatalytic efficacies of TiO2@PANI-o-PDA core-shell nanocomposites on MB were uncommonly enhanced than TiO2 in solar light. Owing to the synergetic interaction between TiO2 and PANI-o-PDA, a rapid charge isolation and gradual charge recombination achieved in the visible irradiation. Our procedure presents an easy and effective way to develop new core-shell nanostructures with varied functionality.