Effect of Running-In Induced Groove-Structured Wear and Fe(acac)3 on Ultralow Friction When Lubricating with 5CB Liquid Crystal

Chen, Hui; Xu, Chonghai; Xiao, Guangchun; Chen, Zhaoqiang; Yi, Mingdong; Zhang, Jingjie

doi:10.1007/s11249-019-1157-8

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…Many worthwhile studies have reported that multiple liquid crystals used as lubricant additives in base oils can provide excellent lubricating performance. − Ghosh and co-workers reported that the samples blended with LCs showed better additive performance than polydactyl acrylate in base oil alone. Moreover, Bermúdez and co-workers reported that adding 1% pure azobenzene, azoxybenzene, and cyanoaryl liquid crystals as additives in SAE 15W/40 oil would improve antiscoring and antiwear properties.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Cholesteric Fluorinated Liquid Crystal as Lubricant Additives in PAO4 under Elevated Temperatures

Zhang

Jiang

Gao

et al. 2021

Ind. Eng. Chem. Res.

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A series of fluorinated liquid crystal compounds with perfluoroalkyl chains are reported and their properties as lubrication additives are discussed. The structures were characterized by Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR), and mass spectrum (MS). The liquid crystalline properties were examined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM), the tribological properties were tested by a universal mechanical tester (UMT), a friction tester, and a 3D optical microscope, and the worn surfaces were analyzed by scanning electron microscopy–energy-dispersive spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that PAO4 with fluorinated liquid crystals (LCs) led to a significant reduction in friction coefficient (30%) and wear (twice over). And the tribological performance was closely related to mesogenic temperature ranges of liquid crystals. The analysis of EDS and XPS indicated that a protective film can be formed of ferric oxide and ferric fluoride. It can be hypothesized that the tribofilm could avoid the direct contact of the rough material on the metal surface on the metal surface, thus reducing friction and wear.

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Section: Introductionmentioning

confidence: 99%

Tribological Properties of Cholesteric Fluorinated Liquid Crystal as Lubricant Additives in PAO4 under Elevated Temperatures

Zhang

Jiang

Gao

et al. 2021

Ind. Eng. Chem. Res.

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“…Although this 1,3-diketone has attracted more and more research interest [32][33] and shows excellent lubricity especially for applications with relatively low contact pressure (e.g. plain bearings [27] ), other aspects of a lubricant such as anti-oxidation, oil detergency, low temperature fluidity and extreme pressure capacity must be also taken into account.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of 1,3-diketone as a novel friction modifier for lubricating oils

Jiang

Amann

et al. 2020

Wear

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“…A través de la tribología se pueden estudiar diferentes comportamientos o mecanismos como el running-in, mecanismo que se da al inicio de un ensayo tribológico, basado en una transición tribológica en la cual la temperatura, la fricción o la tasa de desgaste cambian con el tiempo a causa de una modificación en el contacto, ya sea rugosidad superficial, composición química, microestructura o dureza. Sistemas con ultra-baja fricción pueden presentar altos valores iniciales de fricción [271]. Otro mecanismo a tener en cuenta es el stick-slip (Figura 14), el cual se manifiesta cuando, en el deslizamiento entre dos cuerpos, se produce adherencia, dando como resultado vibración por fricción, aumentos del desgaste, pérdida de material y ruido radiante, lo que reduce la vida útil de los materiales en contacto [272].…”

Section: Tribologíaunclassified

Development, characterisation and properties of nanophases, nanofluids and nanomaterials

Rodríguez¹

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Con esta tesis dejo constancia, por escrito, desde hoy y para la prosperidad, del amor que siento por la ciencia, por el continuo crecimiento, por el enseñar y por el aprender, por el escuchar y por el ser escuchado, por la infinita creencia de que las cosas se pueden hacer mejor, de que se puede ser mejor y de que rodeado de la compañía correcta, todo es mejor.A mi director el Dr. José Sanes Molina, por ser un ejemplo del camino a seguir, habiendo dedicado una vida a la ciencia y la enseñanza. Gracias, por tu apoyo, tu sinceridad, tu constancia, tu buen hacer, cada uno de tus consejos y, sobre todo, cada una de las horas que has dedicado a ayudarme, en todo cuanto he necesitado. Gracias.Se ha observado que todos los líquidos iónicos y todos los nanofluidos utilizados reducen el coeficiente de fricción y el daño superficial cuando se utilizan como lubricantes externos sobre el polímero. Cuando se utilizan como lubricantes internos se observa que los líquidos iónicos apróticos que contienen el anión hexafluorofosfato no mejoran las propiedades tribológicas del polímero ni reducen el daño superficial. En cambio, tanto los líquidos iónicos apróticos que contienen el anión tetrafluoroborato, como el líquido iónico prótico y el nanofluido preparado a partir del líquido iónico prótico con óxido de zinc reducen notablemente el coeficiente de fricción de la matriz polimérica y el daño superficial.

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Effect of Running-In Induced Groove-Structured Wear and Fe(acac)3 on Ultralow Friction When Lubricating with 5CB Liquid Crystal

Cited by 10 publications

References 37 publications

Tribological Properties of Cholesteric Fluorinated Liquid Crystal as Lubricant Additives in PAO4 under Elevated Temperatures

Tribological Properties of Cholesteric Fluorinated Liquid Crystal as Lubricant Additives in PAO4 under Elevated Temperatures

Evaluation of 1,3-diketone as a novel friction modifier for lubricating oils

Development, characterisation and properties of nanophases, nanofluids and nanomaterials

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