Magnetic Structured Nickel Core-Shell @ Silica/PMMA Nanocomposites from Synthesis to Applications

Abulyazied, Dalia E.; Abomostafa, H. M.; komy, G. M. El

doi:10.1007/s10904-020-01445-5

Cited by 19 publications

(10 citation statements)

References 68 publications

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“…After 1 hr, nickelmetal nanoparticles were formed (Scheme 1). 8,35 Then, Ni@SiO 2 core-shell nanoparticles were typically developed by taking 1.0 g of Ni nanoparticles and dispersing them into an ethanol solution containing 10.0 g of poly-(vinylpyrrolidone) (PVP-K30 Aldrich) and 1000 mL of ethanol with stirring for 12 hr. Meanwhile, ammonia solution (NH 3 ÁH 2 O, 25% by weight) was added and ultrasonicated for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…As well as the morphology of the prepared powder (Ni@SiO 2 ) and the Ni@SiO 2 /PMMA nanocomposites were discussed in details using HRTEM and FESEM repectively. 8 The morphology of the prepared composite powder revealed the formation of SiO 2 shell at Ni magnetic nanoparticles and the particle size of the nanoparticles was is in the range from 45 to 160 nm. Besides, it was shown that the formed nanocomposite films were uniform with rough structure (i.e.…”

Section: Introductionmentioning

confidence: 94%

“…Secondly, PMMA solution is added to nanoparticles solution during vigorous stirring. 8 Ni@SiO 2 /PMMA nanocomposites were produced by the casting method (Scheme 3). The thickness of the film was around 500 mm.…”

Section: Preparation Of Ni@sio 2 /Pmma/nanocompositesmentioning

confidence: 99%

“…The dielectric properties were investigated using the Novocontrol high-resolution alpha analyzer. 8 The ultrasonic longitudinal v l and shear v s velocities were obtained using the pulse-echo technique MATEC Model MBS8000 DSP at room temperature.…”

Section: Measurementsmentioning

confidence: 99%

“…Therefore, there is more concern placed on choosing appropriate polymer matrices and fillers. [4][5][6][7][8][9][10][11][12][13] PMMA is one of the most widely used transparent polymers known for its applications in various markets from car windows, smartphone screens to aquariums. It is a tough plastic, easy to shape, and a great alternative to the high cost and less resilient glass.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and mechanical properties of nickel silica core-shell reinforced PMMA nanocomposites

Abulyazied

Abomostafa

2021

Journal of Composite Materials

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This paper study the dielectric and mechanical properties of poly (methyl methacrylate)-nickel silica core-shell nanocomposite. Ni@SiO2/PMMA nanocomposite films were prepared by incorporating Ni@SiO2 nanoparticles in PMMA matrix using the solution casting method. The morphology of the prepared nanoparticles was examined through a High-resolution transition electron microscope (HRTEM), which revealed the formation of SiO2 shell at Ni magnetic nanoparticles. The dielectric properties of the nanocomposite films were studied as a function of temperature and frequency in the ranges of 30–180°C and 100 Hz – 5 MHz respectively. The incorporation of the nano Ni@SiO2 to PMMA has a positive effect on the dielectric constant ε′ of the nanocomposites, as well as, ε′ improved with increasing temperature. The real electric modulus (M′) of composites confirms the occurrence of dispersion in all composites at all temperatures. While dielectric loss tangent ε ″ and the loss part of electric modulus spectra (M) exhibit relaxation peaks which characterize possible relaxation of interfacial polarization in the interface between Ni@SiO2 core-shell and PMMA matrix, these peaks have shifted towards higher frequency with temperature. The relaxation and activation energies, Ec and Ea values decreased from 0.49 to 0.40 eV and from 0.87 to 0.70 eV respectively as Ni@SiO2 content increased. The ac conductivity of the nanocomposite films has deeply increased with increasing temperature and Ni@SiO2 content. The longitudinal modulus (L), shear modulus (G), Young's modulus (E), and bulk modulus (B) of films were studied and they increased as the filler increased from 0 to 15 wt.%.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Preparation Of Ni@sio 2 /Pmma/nanocompositesmentioning

confidence: 99%

Section: Measurementsmentioning

confidence: 99%