ZnO nanoparticles coated with oleic acid as additives for a polyalphaolefin lubricant

Mariño, Fátima; López, Enriqueta R.; Arnosa, Ángela; Gómez, Manuel González; Piñeiro, Yolanda; Rivas, J.; Álvarez-Lorenzo, Carmen; Fernández, Josefa

doi:10.1016/j.molliq.2021.118401

Cited by 35 publications

(16 citation statements)

References 43 publications

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“…These peaks almost disappear after the OA ligand reacts with the ZnO QDs in ethanol through heating at 120 • C. The ZnO-OA (0.5 mL) core-shell QDs show FR-IR absorption peaks at 2926 cm −1 (sp 2 C-H stretch, -CH 3 ), 2854 cm −1 (sp 3 C-H stretch, -CH 2 ), 1540 cm −1 (COO-), 1464 cm −1 (CH 3 bend), 1406 cm −1 (CH 2 bend), and 745 cm −1 (CH 2 rock, bending) which are all characteristic of the OA ligand (2CH 3 (CH 2 ) 15 COOH). This FT-IR spectrum is very similar to those previously reported [18,19]. The vibration band observed at 450~460 cm −1 corresponds to the stretching vibration of the zincite structure (Zn-O) [20].…”

Section: Surface Chemistrysupporting

confidence: 87%

Enhanced Luminance of CdSe/ZnS Quantum Dots Light-Emitting Diodes Using ZnO-Oleic Acid/ZnO Quantum Dots Double Electron Transport Layer

et al. 2022

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The widely used ZnO quantum dots (QDs) as an electron transport layer (ETL) in quantum dot light-emitting diodes (QLEDs) have one drawback. That the balancing of electrons and holes has not been effectively exploited due to the low hole blocking potential difference between the valence band (VB) (6.38 eV) of ZnO ETL and (6.3 eV) of CdSe/ZnS QDs. In this study, ZnO QDs chemically reacted with capping ligands of oleic acid (OA) to decrease the work function of 3.15 eV for ZnO QDs to 2.72~3.08 eV for the ZnO-OA QDs due to the charge transfer from ZnO to OA ligands and improve the efficiency for hole blocking as the VB was increased up to 7.22~7.23 eV. Compared to the QLEDs with a single ZnO QDs ETL, the ZnO-OA/ZnO QDs double ETLs optimize the energy level alignment between ZnO QDs and CdSe/ZnS QDs but also make the surface roughness of ZnO QDs smoother. The optimized glass/ITO/PEDOT:PSS/PVK//CdSe/ZnS//ZnO-OA/ZnO/Ag QLEDs enhances the maximum luminance by 5~9% and current efficiency by 16~35% over the QLEDs with a single ZnO QDs ETL, which can be explained in terms of trap-charge limited current (TCLC) and the Fowler-Nordheim (F-N) tunneling conduction mechanism.

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Section: Surface Chemistrysupporting

confidence: 87%

Enhanced Luminance of CdSe/ZnS Quantum Dots Light-Emitting Diodes Using ZnO-Oleic Acid/ZnO Quantum Dots Double Electron Transport Layer

et al. 2022

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“…Mariño et al used oleic acid-coated ZnO nanoparticles (10 nm) as an additive to the PAO40 oil. 31 Wear scar analysis using confocal Raman spectroscopy shows the ZnO, oleic acid, and iron oxides on the tribofilm. Wu et al studied the oleic acid-coated ZnO nanoparticle (4 nm) as an additive to the PAO and diisooctyl sebacate base oils.…”

Section: Discussionmentioning

confidence: 99%

Organic-modified ZnS nanoparticles as a high-performance lubricant additive

et al. 2023

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“…To improve the stability and dispersibility of the ZnO nanoparticles in the lubricating oil, oleic acid was applied as a dispersant. 22 The results showed that the base lubricant with the addition of ZnO nanoparticles reduced the wear volume and coefficient of friction of the steel discs significantly. Various studies investigate the lubricating properties of a new class of lubricants known as hybrid nano-lubricants.…”

Section: Introductionmentioning

confidence: 96%

“…Gara and Zou 21 used a universal microtribometer to assess the tribological performance of ZnO nanoparticles dispersed in paraffinic mineral oil. To improve the stability and dispersibility of the ZnO nanoparticles in the lubricating oil, oleic acid was applied as a dispersant 22 . The results showed that the base lubricant with the addition of ZnO nanoparticles reduced the wear volume and coefficient of friction of the steel discs significantly.…”

Section: Introductionmentioning

confidence: 99%

Role of ZnO/MWCNTs hybrids nanoparticles addition on the tribological behaviour of SN150 paraffinic mineral oil

Rahim

Saud

Wee

2023

Lubrication Science

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Nanoparticle incorporation plays an active feature in heat transfer, ultimately enhancing the tribological process under boundary conditions of heat stress. Nanoparticles like zinc oxide (ZnO) and multiwall carbon nanotubes (MWCNT) are well known to significantly affect the cooling and lubrication applications, resulting in improved heat transfer and kinematic viscosity. The present work investigates the tribological performance of ZnO/MWCNTs hybrids as lubricant additive in the paraffinic type of mineral base oil of Group I (SN150) engine oil. The chemical composition of the modified and unmodified oil was examined by an inductively coupled plasma‐optical emission spectrometer (ICP‐OES), energy dispersive x‐ray fluorescence (EDXRF) spectrometer, and Fourier‐transform infrared spectroscopy (FTIR). A ring‐on‐disk tribotester was performed to investigate the tribological behaviour through the linear reciprocating mechanism alloy‐steel contacts. The worn steel alloy surfaces morphology and chemical compositions were examined by scanning electron microscope (SEM), energy‐dispersive x‐ray spectroscopy (EDX), and 3D optical profilometer. Different ZnO/MWCNTs nanomaterial volumetric concentrations were examined in order to determine the most effective performance. According to the tribological results, ZnO/MWCNTs hybrid nanomaterials in the engine oil were found to have significantly higher friction temperature and antiwear capability than the base oil. A volumetric concentration of 3.00 wt% ZnO/MWCNTs nanomaterials to SN150 engine oil imparted excellent wear protection to the steel sample than the pure SN150 base oil. Based on the statistical analysis, the modified oil anti‐wear performance was enhanced by reducing the wear loss by 80.5% and friction temperature by 55.8°C compared with the oil base.

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ZnO nanoparticles coated with oleic acid as additives for a polyalphaolefin lubricant

Cited by 35 publications

References 43 publications

Enhanced Luminance of CdSe/ZnS Quantum Dots Light-Emitting Diodes Using ZnO-Oleic Acid/ZnO Quantum Dots Double Electron Transport Layer

Enhanced Luminance of CdSe/ZnS Quantum Dots Light-Emitting Diodes Using ZnO-Oleic Acid/ZnO Quantum Dots Double Electron Transport Layer

Organic-modified ZnS nanoparticles as a high-performance lubricant additive

Role of ZnO/MWCNTs hybrids nanoparticles addition on the tribological behaviour of SN150 paraffinic mineral oil

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