Microstructural comparison between PMMA-SiO2 and PMMA-TiO2 hybrid systems using Eu3+ as ion-probe luminescence

Melgoza-Ramírez, M.L.; Ramı́rez-Bon, R.

doi:10.1016/j.jnoncrysol.2020.120167

Cited by 10 publications

(2 citation statements)

References 45 publications

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“…Figure 1 presents the FT-IR spectra of PS, PS/MbA/TiO2 with various 1, 3, and 7 wt% of TiO2 contents. It was found that the broad peak at 3423 cm -1 corresponds to the stretching of the surface hydroxyl or absorbed water [22,23]. The main absorption bands of PS over the 2800-3100 cm -1 range were attributed to C-H stretching vibrations in the main chain and aromatic rings [23].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of PS-TiO2 hybrid via mini-emulsion polymerization: Study the effect of crosslink on the photocatalytic properties of the hybrid

Phetsombun,

Metanawin,

Metanawin

2023

J Appl Res Sci Tech

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In this study, a polystyrene (PS)/nano-TiO2 hybrid was prepared by a mini-emulsion polymerization process to improve the photocatalytic properties when the crosslinking agent was added. N, N'-methylenebis (acrylamide) (MbA) was used as a crosslinking agent. The effect of a crosslinking agent on the photocatalytic properties was studied. The diameter, morphology, and photocatalytic properties of the samples were characterized and discussed. The methylene blue discoloration was monitored at 660 nm by a spectrophotometer. The result showed that the L* value from the Hunter color scale for 7 wt% TiO2-PS/0.25 wt% MbA was highest at 73.73. It was noticed that the 7 wt% TiO2 - PS/0.25 wt% MbA hybrid gave the highest photocatalytic properties. The FE-SEM confirmed the well-defined structure with a spherical shape and network formation to improve the photocatalytic properties. The diameter and morphology of the PS/TiO2 hybrid were in the range of 76 nm to 95 nm by using a field emission scanning electron microscope (FE-SEM). The particle size of the 1 wt% TiO2 - PS/0.25 wt% MbA was 76 nm, which was smaller than that of the pristine PS of 88 nm. The particle size of the 7 wt% TiO2 – PS/0.25 wt% MbA hybrid was increased by 25%. The HR-TEM image of the PS/TiO2 hybrid was studied to confirm the encapsulation of TiO2 particles in the hybrid. The FFT image of PS/MbA/TiO2 7 wt% demonstrated the crystalline structure of TiO2 (dot) and the amorphous structure of PS (ring). FT-IR spectroscopy confirmed the presence of the Ti-O functional group in the PS hybrid spectra. It was noticed that the TiO2 particles were successfully encapsulated in the PS/TiO2 hybrid.

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Section: Resultsmentioning

confidence: 99%

Fabrication of PS-TiO2 hybrid via mini-emulsion polymerization: Study the effect of crosslink on the photocatalytic properties of the hybrid

Phetsombun,

Metanawin,

Metanawin

2023

J Appl Res Sci Tech

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“…En tanto que los picos de absorción que evidencian la fase orgánica correspondiente al PMMA se asocian con las bandas ubicadas en 1456, 1636, 1707 y 2960 cm -1 . El incremento de las bandas ubicadas en 1457 y 2960 cm -1 aproximadamente, demuestra la presencia del agente acoplante uniendo los materiales orgánicos e inorgánicos [32,33]. Figura 6.…”

Section: Caracterización Del Híbridounclassified

Depósito por aspersión de una capa protectora de SiO2–PMMA sobre acero AISI 1036 con propiedades de barrera a contaminantes atmosféricos

Uicab-Córdova

Hernández-Córdova

Encarnación-Gómez

et al. 2022

hya

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En este trabajo, se sintetizó por sol-gel a temperatura ambiente (25°C) un recubrimiento híbrido de SiO2–PMMA con propiedades de barrera a contaminantes atmosféricos. Los precursores inorgánicos del SiO2 utilizados fueron TEOS:Etanol:Agua 0.1:0.4;1.2 en relación molar. Como precursor orgánico 100 ml de monómero MMA con 0.4 g de BPO como catalizador de la polimerización por radicales libres para obtener el polímero PMMA. Se logró la obtención de películas homogéneas aplicadas por el método de aspersión sobre sustratos metálicos de acero AISI 1036. El espesor de la capa obtenida fue de 30 µm como película seca, sin ningún tratamiento térmico de secado, los sustratos fueron preparados con limpieza química bajo la norma ASTM G1. Estos recubrimientos híbridos de SiO2–PMMA, están bien adheridos al sustrato metálico con grado de adherencia 5B de acuerdo a la norma ASTM D3359, y tienen alta transparencia en el rango del visible con 95%T y capacidad anticorrosiva de -472.44 mV. Esta última, fue evaluada por la técnica electroquímica de Curvas de Polarización y OCP con ambas técnicas se detectó que no existe un intercambio iónico y que el recubrimiento hibrido de SiO2–PMMA genera la protección entre el acero AISI 1036 y la solución de electrolitos.

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Preparation and characterization of CuO/Co3O4/poly(methyl methacrylate) nanocomposites for optical and dielectric applications

El-Sayed

Sayed

2021

J Mater Sci: Mater Electron

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Composites of transition metal oxides (TMOs)/Polymers have many modern technological, industrial, and biological applications. Co3O4 and CuO nanoparticles (Nps) were synthesized by sol-gel. Then they doped into poly(methyl methacrylate) (PMMA) via solution casting method. The obtained Nps and nanocomposite films were then investigated using several techniques. XRD and HR-TEM indicated the high purity of Co3O4 and CuO Nps of face-centered cubic (fcc) with 58 nm average particle size (Dav), and monoclinic structure with Dav = 35 nm, respectively. The amorphous nature of PMMA was influenced after mixing with these Nps. SEM and FTIR confirmed the interaction between Nps and the polymer chains. The pure film showed transparency of about 90% and Nps addition narrowed the optical bandgap effectively while keeping the films with high transmittance. CuO is more effective than Co3O4 on the optical parameters of the films.The dielectric constant improved after adding the Nps, while all films have a low dielectric loss.Additionally, the effects of Co3O4 and CuO on the ac conductivity, Argand plots, and the dielectric modulus are reported. Our nanocomposites are considered a promising candidate for nanotechnology-based devices such as electric stress control, film capacitors and anti-reflective coating for solar cell applications.

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Microstructural comparison between PMMA-SiO2 and PMMA-TiO2 hybrid systems using Eu3+ as ion-probe luminescence

Cited by 10 publications

References 45 publications

Fabrication of PS-TiO2 hybrid via mini-emulsion polymerization: Study the effect of crosslink on the photocatalytic properties of the hybrid

Fabrication of PS-TiO2 hybrid via mini-emulsion polymerization: Study the effect of crosslink on the photocatalytic properties of the hybrid

Depósito por aspersión de una capa protectora de SiO2–PMMA sobre acero AISI 1036 con propiedades de barrera a contaminantes atmosféricos

Preparation and characterization of CuO/Co3O4/poly(methyl methacrylate) nanocomposites for optical and dielectric applications

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