000			02833nam a22001577a 4500
082			_a621
100			_aHaider , Nouman _9122315
245			_aTribological Analysis of Trihexyltetradecylphosphonium bis(2,4,4-trimethyl pentyl)phosphinate ionic liquid based Bio-Lubricants at variable operating conditions. / _cNouman Haider
264			_aIslamabad : _bSMME- NUST; _c2024.
300			_a72p. _bSoft Copy _c30cm
500			_aAll mechanical systems require lubrication between interacting surfaces to avoid failure of mechanical components and to decrease the losses due to friction, especially for the interacting bodies that operate in boundary lubrication regimes. Due to the decrease in the reserve of mineral oils, increasing environmental concerns, and difficulties in the disposal of non-biodegradable conventional lubricants, a trend is increasing amongst researchers to produce more environmental friendly lubricants. The use of bio-lubricants as an alternative to mineral based oil is limited due to its low thermal stability. Ionic liquid are molten salts which are environment friendly and can be used as additive to bio-lubricants to enhance its physiochemical properties. The effectiveness of ionic liquid in bio-lubricants depends upon a lot of factor amongst which its miscibility with that particular lubricant plays an important role. Ionic liquids make strong interaction with polar lubricants and hence can be effectively used as additives to bio-lubricants. Among ionic liquids phosphonium based ionic liquids are found to show best results with lubricants and hence is used in this study. In this thesis tribological performance of phosphonium-based ionic liquid Tri hexyl tetra decylphosphonium bis (2, 4, 4-trimethylpentyl) phosphonate when used as an additive to Cottonseed oil, Rattan Jot oil, Waste Cooking oil and Polyalphaolefin (PAO) will be studied at different operating conditions and results will be compared with conventional PAO base oil. The physical properties of these oils were already investigated by a previous student Tehreem Naveed[1] and their tribological analysis is done in this study. Tribological performance of all lubricants were studied using a four ball tribometer and its wear scars were determined using an electronic microscope OLYMPUS. From this study it was found that with the addition of ionic liquid, tribological performance of all bio-lubricants enhanced. Ionic liquid does not have much effect on the tribological performance of PAO. Rattan Jot oil was found to have the best tribological properties with and without addition of ionic liquid into it.
650			_aMS Mechanical Engineering _9119495
700			_aSupervisor : Dr. Rehan Zahid _9122313
856			_uhttp://10.250.8.41:8080/xmlui/handle/123456789/42946
942			_2ddc _cTHE
999			_c608818 _d608818