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Du, D. C.; Kim, Seock Sam; Chun, Jung Sik; Kwon, Wan Seop; Suh, Chang‐Min

doi:10.1023/a:1016503703006

Cited by 25 publications

(3 citation statements)

References 12 publications

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“…For the same amount of addition, DBHP–ZnO nanoparticles have longer OIT than that of DBHP, demonstrating the good antioxidant ability of DBHP–ZnO nanoparticles. Besides, the OIT tends to rise continuously with the increase of the concentration of DBHP–ZnO nanoparticles and the increased degree of OIT gradually reduces when the amount exceeds the concentration of 0.5%, which is a common phenomenon in the process of adding antioxidants. ,, …”

Section: Resultsmentioning

confidence: 99%

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

et al. 2019

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In this article, 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid (DBHP)-functionalized ZnO (DBHP−ZnO) nanoparticles were synthesized by decomposing the organometallic precursor Zn(DBHP) 2 under alkaline conditions. This in situ surface modification method can induce small-sized ZnO nanoparticles (5 nm) and form strong linkage between DBHP and ZnO nanoparticles. DBHP as an organic compound hindered phenol antioxidant that not only improved the dispersion stability of the prepared DBHP−ZnO nanoparticles in the lubrication oil but also scavenged free radicals produced during the oxidation process of oil. Compared with DBHP, the thermal stability of the prepared composite antioxidant was greatly enhanced by introducing inorganic ZnO nanoparticles, which was proved by the results of the thermogravimetric analysis test. A rotary oxygen bomb test, pressurized differential scanning calorimetry, and free-radical-scavenging method all showed that DBHP−ZnO nanoparticles had better antioxidant properties than DBHP under high temperature in the base oil of di-iso-octylsebacate (DIOS). The activation energy of the oxidation process was used to analyze this result by the model-free methods, including the Flynn−Wall−Ozawa method and the Kissinger equation. The calculated results showed that DIOS containing DBHP−ZnO nanoparticles have the lowest reaction constant and the longest half-life period compared to those of individual DBHP and ZnO nanoparticles, which is attributed to the combined action of the organic−inorganic composites. Besides, DBHP−ZnO nanoparticles as the additive are able to improve the antiwear ability of DIOS to some extent. Therefore, the as-prepared DBHP−ZnO nanoparticles with desired dispersibility as well as better thermal stability and antioxidant ability than DBHP in the DIOS base oil could be a potential high-performance nanocomposite additive for a synthetic lubricant base oil like DIOS.

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Section: Resultsmentioning

confidence: 99%

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

et al. 2019

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“…As a result, the oil becomes spent and needs frequent replacement with a new oil to avoid engine malfunction. , To increase the life span of the oil and retain its integrity during service under the hostile engine conditions, several performance improvement additives are added. − Among these, the focus has been made on new and novel antioxidants. Many synthetic antioxidants have been studied up to date. − However, most of them are petroleum-derived and possess process and environmental problems. − Moreover, they suffer from antagonism in the presence of impurities, such as water, ethylene glycol, fuel, soot, and wear metals, and lose potential as antioxidants. , …”

Section: Introductionmentioning

confidence: 99%

Oxidative Stability of Base Lubricant Oil Monitored by Gas Chromatography–Mass Spectrometry: Influence of Sawdust-Derived Antioxidants

et al. 2017

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This paper focuses on evaluating the potential of sawdust-derived antioxidants in oxidative stability of the lubricant oil samples monitored through gas chromatography−mass spectrometry (GC−MS). The plain and antioxidants-spiked oil samples were subjected to artificial aging at 100 °C for 6 h in a flow of air (10 L h −1 ). The results indicate that the antioxidants under study imparted thermo-oxidative stabilities to the oil compared to the plain sample and exhibited good antioxidants potential at 100 °C.

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“…Antioxidants are the key additives that protect lubricants from oxidative degradation and allow them to meet the requirements of industrial applications (El-Mekabaty et al, 2012;Mangolini et al, 2010;Du et al, 2002). In recent years, many antioxidant classes have been developed and used in various kinds of lubricating oils.…”

Section: Introductionmentioning

confidence: 99%

Effect of alkylated diphenylamine on thermal-oxidative degradation behavior of poly-α-olefin

et al. 2015

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An oil-soluble antioxidant, alkylated diphenylamine (ADPA), was prepared by alkylation of diphenylamine. The influence of ADPA on the thermal-oxidative stability of poly-α-olefin (PAO8) was evaluated by thermogravimetry (TG). For comparison, the thermal-oxidative stability of PAO8 with zinc dialkyl dithiophosphate (ZDDP) was also investigated. Activation energy (Ea) of the corresponding thermal-oxidative degradation process was evaluated by the Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods. To demonstrate the reliability of the kinetic study, the antioxidant performance of ADPA and ZDDP in PAO8 was also studied by the pressure drop (PDT) and accelerated oxidation (AOT) tests. The results indicate that ADPA has better antioxidant ability than ZDDP in increasing the Ea value and enhancing the oxidative stability of PAO8. Good correlation between the applied test methods was established.

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Cited by 25 publications

References 12 publications

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

Oxidative Stability of Base Lubricant Oil Monitored by Gas Chromatography–Mass Spectrometry: Influence of Sawdust-Derived Antioxidants

Effect of alkylated diphenylamine on thermal-oxidative degradation behavior of poly-α-olefin

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