Experimental investigation on the stability and abrasive action of cerium oxide nanoparticles dispersed diesel
Experimental investigation on the stability and abrasive action of cerium oxide nanoparticles dispersed diesel
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DOI：
10.1016/j.energy.2017.05.032
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发表时间：
2017-07
期刊：
影响因子：
9
通讯作者：
S. Balamurugan;V. Sajith
中科院分区：
文献类型：
--
作者：
S. Balamurugan;V. Sajith
二氧化铈纳米颗粒是一种众所周知的用于降低柴油发动机颗粒排放的燃油添加剂。使用二氧化铈纳米颗粒的主要挑战是在柴油中缺乏长期分散稳定性及其对柴油润滑性的影响。本文主要研究了稳定的纳米二氧化铈柴油悬浮液的合成及其润滑性能。采用共沉淀法合成了纳米氧化铈，采用两步法制备了纳米流体。基于临界胶束浓度研究确定油酸（表面活性剂）的最佳浓度，并且柴油中二氧化铈纳米颗粒的浓度从5至25ppm变化。使用动态光散射系统和浊度计的长期分散稳定性研究显示，对于最大稳定性，10ppm作为二氧化铈纳米颗粒在柴油中的最佳浓度。采用销盘摩擦磨损试验机研究了改性柴油的摩擦学性能。发现柴油中所有纳米添加剂浓度的磨损率都降低，并且在15 ppm时最小。基于所进行的研究，报道了lOppm作为柴油中纳米颗粒的最佳浓度，与柴油中二氧化铈纳米颗粒的其它浓度相比，其具有增强的稳定性和润滑性。
Ceria nanoparticle is a well-known fuel borne additive for reducing the particulate emissions from diesel engines. Main challenges in the use of ceria nanoparticles are the lack of long-term dispersion stability in diesel and their effect on lubricity of diesel. The present work mainly focuses on synthesis of stable ceria nanoparticle diesel suspension and study on their lubricity. Ceria nanoparticles were synthesized by co-precipitation method and nano fluids were prepared by two-step method. The optimum concentration of oleic acid (surfactant) was determined based on critical micelle concentration studies and concentration of ceria nanoparticle in diesel was varied from 5 to 25 ppm. Long term dispersion stability studies using Dynamic light scattering system and Turbidity meter shows 10 ppm as an optimum concentration of ceria nanoparticle in diesel for maximum stability. Tribological properties of modified diesel were studied by a standard pin on disk apparatus. The wear rate was found to be reduced for all the nano additive concentrations in diesel and was least for 15 ppm. Based on studies conducted, 10 ppm is reported as an optimum concentration of nanoparticle in diesel having both enhanced stability and lubricity as compared to other concentrations of ceria nanoparticles in diesel.