Role of CuO and CeO2 Nanoparticles as Lubricant Additives in Modification of Their Tribological and Rheological Properties|RISS 상세보기

다국어 초록 (Multilingual Abstract)

This comprehensive study explores the transformative potential of incorporating nanoparticles into lubricating oils to optimize their tribological, rheological, and thermal properties. The investigation encompasses three distinct studies, each focusing on different types of nanoparticles and their profound impact on lubricant performance. The initial study centers on the integration of copper oxide (CuO) nanoplatelets, synthesized through sonochemical methods, into a commercially available fully synthetic lubricating oil (5W-40). Employing a specially designed reciprocating tribometer, the research unveils a substantial 32% reduction in the coefficient of friction (CoF) with the addition of merely 0.1% CuO nanoplatelets, underscoring the potential for improved tribological efficiency and consequential energy savings. The second study introduces copper oxide (CuO) nanoballs as additives in polyalphaolefin (PAO) oil, showcasing a remarkable 37% reduction in COF with a mere 0.01 wt% of CuO nanoballs. This study emphasizes the pivotal role of nanoparticle shape, emphasizing a significant rolling effect contributing to enhanced lubrication efficiency. The third study explores the incorporation of bio-synthesized cerium oxide (CeO2) nanoparticles, unveiling their multifaceted impact on thermal, tribological, and rheological characteristics. Exhibiting a substantial 26% reduction in CoF, a notable 50% increase in thermal conductivity, and a stable Newtonian behavior, these nanoparticles prove their efficacy in enhancing lubrication and extending machinery lifespan. Collectively, this thesis provides invaluable insights into the potential of various nanoparticles as additives in lubricating oils, presenting promising avenues for the development of advanced nanolubricants with superior efficiency and durability across diverse industrial applications. The research marks a significant stride in advancing the field of lubrication technologies, promising transformative impacts on machinery performance and operational longevity.

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목차 (Table of Contents)

CHAPTER 1 1
INTRODUCTION 1
1.1 Background and Motivation 1
1.1.1 Overview of lubrication technologies 1
1.1.2 Challenges in Lubrication 3

CHAPTER 1 1
INTRODUCTION 1
1.1 Background and Motivation 1
1.1.1 Overview of lubrication technologies 1
1.1.2 Challenges in Lubrication 3
1.1.3 Introduction to Nanoparticles in Lubricating Oils . 4
1.1.4 Rationale for Nanoparticle Modification 5
1.1.5 Relevance to Industry and Applications: 6
1.1.6 Research Gap and Need for Investigation 8
1.2 Objectives of the Study . 10
1.2.1 To Investigate the Tribological Properties 10
1.2.2 To Assess the Rheological Behavior 11
1.2.3 To Examine the Thermal Conductivity Enhancements . 13
1.2.4 To Compare Different Nanoparticle Types . 14
1.2.5 To Provide Recommendations for Practical Implementation 15
1.3 Scope and Significance . 16
1.3.1 Scope of the Research 16
1.3.2 Significance of the Research: . 17
1.4 Organization of the Thesis 18
CHAPTER 2 . 19
LITERATURE REVIEW . 19
2.1 Nanoparticles in Lubricating Oils 19
2.2 Tribological Properties of Lubricants 24
2.3 Rheological Behavior of Lubricating Oils 27
2.4 Thermal Conductivity in Nanolubricants . 30
CHAPTER 3 . 33
Experimental Methodology . 33
3.1 Synthesis of nanoparticles 33
3.1.1 Sonochemical Synthesis of CuO Nanoplatelets 33
3.1.2 Sole-gel Synthesis of CuO NBs 34
3.1.3 Bio-Synthesis of CeO2 nanoparticles . 35
3.2 Characterization and experimental setup used 37
3.2.1 Characterization 37
3.2.1.1 X-ray Diffractometer 38
3.2.1.2 RAMAN spectroscopy 39
3.2.1.3 Fourier Transform Infrared Spectrometer 40
3.2.1.4 Scanning Electron Microscope (SEM) . 42
3.2.1.5 Transmission Electron Microscope (TEM) . 43
3.2.1.6 Zeta potential meter 44
3.2.2 Experimental Setup . 45
3.2.2.1 Design and Setup of fabricated reciprocating tribometer. 46
3.2.2.2 Commercial reciprocating tribometer 49
3.2.2.3 Rheometer 51
3.2.2.4 Thermal Conductivity analyzer . 52
3.2.2.5 Roughness parameter analyzer 54
3.2.3 Preparation of Nanolubricants 55
3.2.4 Testing Conditions 60
CHAPTER 4 . 63
Results and Discussions . 63
4.1 Nanolubricants Prepared using CuO nanoplatelets with fully synthetic motor oil. 63
4.1.1 Structural Characterization . 63
4.1.2 Morphological Characterization 64
4.1.3 Effect on Morphology after Mixing in Oil 66
4.1.4 Dispersion of Nanoparticles (NPs) . 68
4.1.5 Zeta Potential of Nanolubricants 69
4.1.6 Tribological Characterization . 70
4.2 Nanolubricants Prepared using CuO nanoballs with PAO oil. 78
4.2.1 X-ray diffraction (XRD) 78
4.2.2 Raman spectroscopy 79
4.2.3 FTIR analysis . 80
4.2.4 Morphological characterization 83
4.2.5 Dispersion and stability of NBs 86
4.2.6 Zeta potential . 89
4.2.7 Viscosity analysis . 90
4.2.7.1 Viscosity increment . 90
4.2.7.2 Relative viscosity . 91
4.2.7.3 Viscosity index 92
4.2.8 Rheology 93
4.2.9 Thermal analysis 95
4.2.10 Tribological characterization 97
4.2.11 Wear tracks 99
4.2.12 Wear rate . 103
4.3 Nanolubricants Prepared using bio-synthesized CeO2 nanoparticles with PAO oil . 106
4.3.1 XRD diffraction . 106
4.3.2 Morphological characterization . 107
4.3.3 FTIR characterization . 109
4.3.4 TG-DTA analysis 110
4.3.5 Rheological properties 112
4.3.6 Relation between Viscosity and temperature 114
4.3.7 Relative Viscosity . 115
4.3.8 Viscosity Index 116
4.3.9 Thermal Conductivity . 117
4.3.10 Tribological Properties . 119
CHAPTER 5 121
CONCLUSIONS . 121
5.1 Summary of Findings 121
5.2 Implications of the Study 121
5.3 Recommendations for Future Research . 123
BIBLIOGRAPHY 125
SUMMARY IN KOREAN . 139

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