Copper‐doped zinc oxide nanoparticles: Influence on thermal, thermo mechanical, and tribological properties of polycarbonate

Abstract

In the existing study, an attempt has been made to develop scratch resistant polycarbonate (PC) nanocomposites using inorganic ZnO nanoparticles doped with copper (ZnCuO). The ZnCuO nanoparticles were synthesized using co‐precipitation method and modified using phosphoric acid ethyl hexyl ester (PAEH). The size range of nanoparticles was confirmed to be around 55–75 nm using AFM. TGA, FTIR, and NMR confirmed modification of nanoparticles and XRD approved of size reduction due to doping. PC/ZnCuO nanocomposites (PCNC) with a loading of 1%, 3% and 5% by weight were prepared by melt extrusion and an evaluation of thermal, thermo‐mechanical, and tribological properties were carried out. The dispersion study using FE‐SEM images revealed the presence of aggregates. Thermal analyses using TGA and DSC indicated a decrement in stability for PCNC. The PCNC was found to exhibit better storage modulus with an enhancement of 23% with a 3 wt% loadings of nanoparticles as compared to pure PC. The tribological study of PCNC indicated a favorable decrement of a coefficient of friction by nearly 14% in the case of 3% PCNC. POLYM. COMPOS., 39:E1398–E1406, 2018. © 2017 Society of Plastics Engineers

Synergistic effects of Cu-doped ZnO nanoantibiotic against Gram-positive bacterial strains

“…Because of the significant improvement in the properties of ZnO-NPs with Cu-doping, several techniques have been reported in the past [ 24 ]. Cu-doped ZnO-NPs has been reported with a band gap of ~3.4 eV by the co-precipitation method.…”

Highly Dispersed Ag2S Nanoparticles: In Situ Synthesis, Size Control, and Modification to Mechanical and Tribological Properties towards Nanocomposite Coatings

“…The storage modulus in the glassy regions, representing the stiffness, tended to increase after the introduction of the in situ generated Ag 2 S nanoparticles (Figure 5a), and in particular, the nanocomposite coating S-C4 exhibited the highest storage modulus (referring to the highest load-bearing capacity), which corresponds well with its high micro-hardness and elastic modulus [36,37,38]. In addition, the peak location in loss factor (tan δ )–temperature curve represents the glass transition temperature of the material, and the peak intensity reflects the ability to dissipate energy [39]. As can be seen from Figure 5b, the glass transition temperature of the pure polymer resin was 153 °C, which increased for nanocomposite coatings with in situ generated Ag 2 S nanoparticles.…”

Enhancement of Triboactivity of Nanolamellar Graphitic-C3N4 by N-Doped ZnO Nanorods

“…Zinc oxide has an open hexagonal crystal structure. − Doping with different atoms as zinc or oxygen substitutes promotes the formation of defects, which affect the structure and eventually result in improved properties. − These defects may lead to the formation of slip systems that can change the electronic structure and lower the shear strength; ultimately, tribological properties are enhanced. , The metal ions such as magnesium, copper, and aluminum are known to remarkably improve ZnO activity. ,− However, doping of ZnO by a substitute of oxygen has been seldom considered. Because nitrogen and oxygen occupy an adjacent position in the periodic table, their size and electronegativity are not widely different.…”