Study on the relationship between the tribological properties and oxidation degree of graphene derivatives in O/W emulsion

Wu, Yinglei; Sun, Tao; He, Zhongyi; Zeng, Xiangqiong; Ren, Tianhui; Vries, Erik G. de; Heide, Emile van der

doi:10.1016/j.triboint.2021.106875

Cited by 17 publications

(9 citation statements)

References 44 publications

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“…The larger contact area at the interface was generated with increased distance. As a result, the stress and contact lubricating at the interface was gradually stable . This lubricating process was the action of water and surfactant at the interface of the high internal phase oil-in-water emulsion.…”

Section: Resultsmentioning

confidence: 99%

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Study on the Liquid–Liquid and Liquid–Solid Interfacial Behavior of Functionalized Graphene Oxide

Shang

Zeng

et al. 2022

Langmuir

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With the rise of carbon neutrality, the applications of carbon-based materials are gaining considerable attention. Graphene oxide (GO) is a two-dimensional sheet with epoxy and hydroxyl groups on the basal plane and carboxyl groups at the edge. In order to change the oil/water (o/w) interfacial activity, GO was controlled and modified by dodecylamine to get two kinds of functionalized GOs (fGOs), named as basal plane-functionalized GO (bGO) and edge-functionalized GO (eGO), respectively. The interfacial tension measurement showed that fGOs could reduce more interfacial tension at the poly-α-olefin/water interface than those at synthetic esters or aromatic compounds/water interfaces. Besides, eGO can reduce more poly-α-olefin-4/water interfacial tension compared to bGO. The interfacial dilatational rheology of eGO and fatty alcohol polyoxyethylene ether-4 (MOA4) showed that MOA4 gradually replaced eGO at the interface with the increase of MOA4, until the interface was completely occupied. eGO and MOA4 complex emulsion exhibited the best friction-reducing performance at 250 rpm. The coefficient of friction (COF) curves of the emulsions with eGO showed two platforms, with the COF reduced by 37.42% at the most. The rheological results of emulsions showed that the addition of eGO increased the elasticity of the emulsion. Emulsions showed shear-thinning and friction-thickening properties, which make it easier for the emulsion to form a lubricating film on the metal surface. Our research results suggested that the functionalization on the edge of GO will change the interfacial properties significantly, which have widespread applications in the encapsulation of active materials, surface protection, adsorption, and separation of pollutants.

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Section: Resultsmentioning

confidence: 99%

“…As a result, the stress and contact lubricating at the interface was gradually stable. 67 This lubricating process was the action of water and surfactant at the interface of the high internal phase oil-in-water emulsion. With the proceeding of friction, the droplets formed small droplets or were disrupted by the shear.…”

Section: Methodsmentioning

confidence: 99%

Study on the Liquid–Liquid and Liquid–Solid Interfacial Behavior of Functionalized Graphene Oxide

Shang

Zeng

et al. 2022

Langmuir

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“…The nanoscale mechanical properties of the tribofilms on the rings were measured by nanoindentation. Details of the instrumentation and calibration have been given in our previous research [15]. Nanoindentation experiments were performed using a 25 μN load, which can make the influence of the underlying substrate negligible.…”

Section: Worn Surface Analysismentioning

confidence: 99%

Explore the Tribological Effects of Two N-Containing Functional Groups on O/W Emulsion

Heide

et al. 2022

Tribol Lett

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Two water-soluble N-containing additives without sulfur and phosphorus, hexanamide with tetraethylenepentamine (EEHA) and benzotriazole amide with diethylenetriamine (BTAA), were synthesized and used as additives in the oil-in-water emulsion to investigate the effect of amino and benzotriazole ring on the tribological properties of the emulsion. The results showed that EEHA/BTAA exhibited wear resistance under all tested conditions. This may be attributed to the basic aminofunctional groups in the additives which reduce the corrosive wear of the base emulsion. BTAA-emulsion showed the best friction-reducing and anti-wear performance under the 3 N loading condition, which may be attributed to its benzotriazole ring, which cannot be easily decomposed and could form self-assembled layers through π-π stacking. This π-π stacking may effectively compensate for the low chemical reactivity of the benzotriazole ring, and serve as a better protective film to exert tribological properties.

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“…In additional, more and more novel additives are used in emulsions. [6][7][8][9] Therefore, effective additives play an irreplaceable role in the domain of emulsions.…”

Section: Introductionmentioning

confidence: 99%

“…In order to resolve the above problems of phosphate esters, some novelty phosphate esters derivatives by introduction of sulfur, nitrogen, boron and other elements was researched and commercialization for further improving their performance. In additional, more and more novel additives are used in emulsions 6–9 . Therefore, effective additives play an irreplaceable role in the domain of emulsions.…”

Section: Introductionmentioning

confidence: 99%

Tribological performance of protic ionic liquids containing dibutyldithiophosphate as lubricating additives in O/W emulsions

Zhao

Wang

2022

Lubrication Science

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A series of protic ionic liquids (PILs) containing dibutyldithiophosphate were simply synthesised and used as lubricant additive in base emulsion. The physico‐chemical and lubricating properties of PILs in emulsion were systematically investigated. The stability of prepared emulsions containing PILs were similar with base emulsions by particle size distribution tests. Compared with traditional additive of polysulfide, the PILs in emulsion exhibited superior lubricating properties under harsh conditions. Surprisingly, the oil‐miscible O‐PILs in emulsion showed better friction and wear reduction than water‐miscible T‐PILs in emulsion. The stable protective films formed on the steel surface by results of scanning electron microscope and X‐ray photoelectron spectroscopy were the main reason for the preferable performance.

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Study on the relationship between the tribological properties and oxidation degree of graphene derivatives in O/W emulsion

Cited by 17 publications

References 44 publications

Study on the Liquid–Liquid and Liquid–Solid Interfacial Behavior of Functionalized Graphene Oxide

Study on the Liquid–Liquid and Liquid–Solid Interfacial Behavior of Functionalized Graphene Oxide

Explore the Tribological Effects of Two N-Containing Functional Groups on O/W Emulsion

Tribological performance of protic ionic liquids containing dibutyldithiophosphate as lubricating additives in O/W emulsions

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