Extensive examination of sonication duration impact on stability of Al2O3-Polyol ester nanolubricant

Author(s):  
A. Nugroho ◽  
Z. Bo ◽  
R. Mamat ◽  
W.H. Azmi ◽  
G. Najafi ◽  
...  
Keyword(s):  
2021 ◽  
pp. 108101
Author(s):  
Xiaotian Ma ◽  
Yao Zhang ◽  
Zijia Song ◽  
Kun Yu ◽  
Changliu He ◽  
...  

2004 ◽  
Vol 43 (21) ◽  
pp. 6638-6646 ◽  
Author(s):  
Dianxia Wang ◽  
Paria Mousavi ◽  
Peter J. Hauser ◽  
William Oxenham ◽  
Christine S. Grant

2020 ◽  
pp. 53-57
Author(s):  
M.A. Mammadyarov ◽  
◽  
G.N. Gurbanov ◽  
K.M. Yusifova ◽  
◽  
...  

The simple and anisometric esters of 2.2.5.5-tetra methylol cyclopenthanole were synthesized with hexanole and heptanoic acids adding these esters to those of pentaerithritol and the mixture of fatty acids of С5-С9 fractions, oil compositions were prepared and studied as well. It was defined that operation characteristics of these compositions are significantly better than those of pentaerithritol ester and B-3W oil based on pentaerithritol ester. According to this data, the compositions based on polyol ester are recommended as new lubricants meeting modern standards.


Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2256
Author(s):  
Wenyuan Zhu ◽  
Fangyuan Liang ◽  
Hewei Hou ◽  
Yuting Chen ◽  
Xiaohui Liu ◽  
...  

In this study, a polyol ester from levulinic acid (LA) and trimethylolpropane (TMP) was synthesized by enzymatic catalysis in a solvent-free system. The total conversion of TMP reached up to 84% on average after lipase recycling for five times. The produced ester showed excellent lubrication properties, such as high viscosities at 40 °C (86.53 mm2/s) and 100 °C (8.91 mm2/s), a good viscosity index (49), a low pour point (−27 °C), and a high flash point (223 °C). The frictional wear behavior was evaluated on a four-ball test machine (FTM) by adding the ester into a reference mineral oil. The blend with 10% ester showed a smaller wear scar diameter (WSD) (0.62 mm) when compared with that of pure mineral oil (0.78 mm). The results demonstrated that the obtained ester has huge potential as biolubricant basestock.


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Rida Tajau ◽  
Rosiah Rohani ◽  
Siti Selina Abdul Hamid ◽  
Zainah Adam ◽  
Siti Najila Mohd Janib ◽  
...  

AbstractPolymeric nanoparticles (NPs) are commonly used as nanocarriers for drug delivery, whereby their sizes can be altered for a more efficient delivery of therapeutic active agents with better efficacy. In this work, cross-linked copolymers acted as core–shell NPs from acrylated palm olein (APO) with polyol ester were synthesized via gamma radiation-induced reversible addition-fragmentation chain transfer (RAFT) polymerisation. The particle diameter of the copolymerised poly(APO-b-polyol ester) core–shell NPs was found to be less than 300 nm, have a low molecular weight (MW) of around 24 kDa, and showed a controlled MW distribution of a narrow polydispersity index (PDI) of 1.01. These properties were particularly crucial for further use in designing targeted NPs, with inclusion of peptide for the targeted delivery of paclitaxel. Moreover, the characterisation of the synthesised NPs using Fourier Transform-Infrared (FTIR) and Neutron Magnetic Resonance (NMR) analyses confirmed the possession of biodegradable hydrolysed ester in its chemical structures. Therefore, it can be concluded that the synthesised NPs produced may potentially contribute to better development of a nano-structured drug delivery system for breast cancer therapy.


2006 ◽  
Vol 1 (7) ◽  
pp. 1934578X0600100 ◽  
Author(s):  
Kuiwu Wang ◽  
Yuanjiang Pan

A new (1) and a known (2) β-dihydroagarofuran sesquiterpene polyol esters were isolated from Celastrus rosthornianus and their structures were established by 1D- and 2D-NMR spectroscopic techniques. The two compounds exhibited anti-tumor activities against a panel of human tumor cell lines.


2015 ◽  
Vol 3 (9) ◽  
pp. 2187-2193 ◽  
Author(s):  
Puyou Jia ◽  
Meng Zhang ◽  
Lihong Hu ◽  
Guodong Feng ◽  
Caiying Bo ◽  
...  

ChemInform ◽  
2003 ◽  
Vol 34 (45) ◽  
Author(s):  
Hong Wang ◽  
Xuan Tian ◽  
Yuan-Jiang Pan
Keyword(s):  

1993 ◽  
Vol 33 (2) ◽  
pp. 503-505 ◽  
Author(s):  
Judit Hohmann ◽  
Gábor Nagy ◽  
Gábor Günther
Keyword(s):  

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