Thermodynamic and kinetic studies of crystal violet dye adsorption with poly(methyl methacrylate)–graphene oxide and poly(methyl methacrylate)–graphene oxide–zinc oxide nanocomposites

2019 ◽  
pp. 47495 ◽  
Author(s):  
Mostafa Rajabi ◽  
Kazem Mahanpoor ◽  
Omid Moradi
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Methyl Methacrylate ◽  
Crystal Violet ◽  
Dye Adsorption ◽  
Kinetic Studies ◽  
Poly Methyl Methacrylate ◽  
Crystal Violet Dye

scholarly journals Influence of HRGO Nanoplatelets on Behaviour and Processing of PMMA Bone Cement for Surgery

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2027
Author(s):  
Jaime Orellana ◽  
Ynés Yohana Pastor ◽  
Fernando Calle ◽  
José Ygnacio Pastor
Keyword(s):  
Graphene Oxide ◽  
Methyl Methacrylate ◽  
Bone Cement ◽  
Reduced Graphene Oxide ◽  
Sintering Temperature ◽  
Structural Function ◽  
Mechanical And Thermal Properties ◽  
Poly Methyl Methacrylate ◽  
Pmma Bone Cement ◽  
Reduced Graphene

Bone cement, frequently based on poly (methyl methacrylate), is commonly used in different arthroplasty surgical procedures and its use is essential for prosthesis fixation. However, its manufacturing process reaches high temperatures (up to 120 °C), producing necrosis in the patients' surrounding tissues. To help avoid this problem, the addition of graphene could delay the polymerisation of the methyl methacrylate as it could, simultaneously, favour the optimisation of the composite material's properties. In this work, we address the effect of different percentages of highly reduced graphene oxide with different wt.% (0.10, 0.50, and 1.00) and surface densities (150, 300, 500, and 750 m2/g) on the physical, mechanical, and thermal properties of commercial poly (methyl methacrylate)-based bone cement and its processing. It was noted that a lower sintering temperature was achieved with this addition, making it less harmful to use in surgery and reducing its adverse effects. In contrast, the variation of the density of the materials did not introduce significant changes, which indicates that the addition of highly reduced graphene oxide would not significantly increase bone porosity. Lastly, the mechanical properties (strength, elastic modulus, and fracture toughness) were reduced by almost 20%. Nevertheless, their typical values are high enough that these new materials could still fulfil their structural function. In conclusion, this paper presents a way to control the sintering temperature, without significant degradation of the mechanical performance, by adding highly reduced graphene oxide so that local necrosis of bone cement based on poly (methyl methacrylate) used in surgery is avoided.

Synthesis, Characterization of Modified Graphene Oxide/Poly(methyl methacrylate) Composites

2018 ◽  
Vol 60 (4) ◽  
pp. 530-539
Author(s):  
Yuying Tang ◽  
Hongwen Zhang ◽  
Huan Liu ◽  
Yu Cao ◽  
Jiayu Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Modified Graphene Oxide ◽  
Modified Graphene

scholarly journals Zinc Oxide Nanoparticles Obtained by Supercritical Antisolvent Precipitation for the Photocatalytic Degradation of Crystal Violet Dye

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 346 ◽  
Author(s):  
Franco ◽  
Sacco ◽  
De Marco ◽  
Vaiano
Keyword(s):  
Zinc Oxide ◽  
Crystal Violet ◽  
Zno Nanoparticles ◽  
Treatment Time ◽  
Irradiation Time ◽  
Effect Of Temperature ◽  
Antisolvent Precipitation ◽  
Supercritical Antisolvent ◽  
Crystal Violet Dye ◽  
Mean Diameter

In this work, the synthesis of zinc oxide (ZnO) photocatalyst from thermal decomposition of zinc acetate (ZnAc) nanoparticles obtained by supercritical antisolvent (SAS) precipitation was investigated. The optimization of calcination conditions of the SAS ZnAc was carried out, studying the effect of temperature (in the range 300–600 °C) on the production of ZnO nanoparticles. In particular, it was demonstrated that the organic residues in ZnO and its particle size, thus the specific surface area, strongly affect the photocatalytic performances. SAS micronization of ZnAc produces regular nanoparticles with a mean diameter of about 54.5 ± 11.5 nm, whereas unprocessed ZnAc is characterized by very large crystals. The experimental results evidenced that ZnAc prepared by SAS process calcined at 500 °C showed a regular nanometric structure (mean diameter: 65.0 ± 14.5 nm) and was revealed to be the best choice for the photocatalytic removal of crystal violet dye (CV). In fact, the photocatalytic activity performances of ZnO nanoparticles prepared by this route were higher with respect to that of ZnO from unprocessed ZnAc calcined at 500 °C (which is characterized by irregular tetrapods with mean size 181.1 ± 65.5 nm). The optimized photocatalyst was able to assure the complete CV decolorization in 60 min of UV irradiation time and a mineralization degree higher than 90% after 120 min of treatment time.

Poly(methyl methacrylate)/Graphene Oxide Nanocomposites by a Precipitation Polymerization Process and Their Dielectric and Rheological Characterization

2014 ◽  
Vol 47 (6) ◽  
pp. 2149-2155 ◽  
Author(s):  
Jean-Michel Thomassin ◽  
Milana Trifkovic ◽  
Walid Alkarmo ◽  
Christophe Detrembleur ◽  
Christine Jérôme ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Methyl Methacrylate ◽  
Precipitation Polymerization ◽  
Polymerization Process ◽  
Rheological Characterization ◽  
Poly Methyl Methacrylate
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