scholarly journals Moringa and Graphite as Additives to Conventional Petroleum-Based Lubricants

Lubricants ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 65
Author(s):  
Nadiège Nomède-Martyr ◽  
Philippe Bilas ◽  
Yves Bercion ◽  
Philippe Thomas
Keyword(s):  
Fatty Acid ◽  
Ambient Temperature ◽  
Vegetable Oil ◽  
Solid Lubricant ◽  
Lubricant Additive ◽  
Adsorption Effect ◽  
Engine Oils ◽  
Graphite Particles ◽  
Antiwear Properties ◽  
Moringa Oil

Many researches are focused on the tribological performances of pure vegetable oil in order to replace the conventional mineral engine oils. This work investigates the influence of local moringa oil (noted VO) on the performances of lubricants formed from a blend of dodecane and graphite particles at ambient temperature. In a first part, a reduction of about 50% of friction properties of dodecane is observed when adding small amounts of moringa oil (VO), which is intended to be used as a bio-base performance additive in lubricant formulations. The friction properties of their blends with graphite, generally employed as solid lubricant additive, showed an adsorption effect of fatty acid molecules. The more promising results were obtained for the blend containing 2 w% of VO. Physicochemical characterizations of the tribofilms evidence the good antiwear properties of the lubricant.

Moringa oil with pristine and fluorinated carbon nanofibers as additives for lubrication

2021 ◽  
pp. 1-26
Author(s):  
Nadiege Nomede-Martyr ◽  
Yves Bercion ◽  
Bilas Philippe ◽  
Marc Dubois ◽  
Henry Joseph ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Ambient Temperature ◽  
Carbon Nanofibers ◽  
Solid Lubricant ◽  
Solid Lubricant Additives ◽  
Adsorption Effect ◽  
Base Oil ◽  
Antiwear Properties ◽  
Fluorinated Carbon ◽  
Moringa Oil

Abstract This paper focuses on the influence of local moringa oil on the performances of lubricants formed from blend of dodecane and pristine or fluorinated carbon nanofibers at ambient temperature. The friction experiments have been evaluated using a reciprocating ball on plane tribometer. Moringa oil is designed to be used as a bio-additives in lubricant formulations. First, the addition of small amounts of moringa oil in dodecance allowed a reduction about 50% of the base oil friction performances. In a second part, a comparative study investigates the friction properties of their blends with pristine carbon nanofibers (CNFs) and fluorinated ones (CF0.85) which are intended to be used as solid lubricant additives. An adsorption effect of fatty acid molecules is showed with CNFs particles unlike CF0.85. Whatever was the percentage of moringa oil added, the more promising results were obtained with CF0.85. Physicochemical characterizations of the tribofilms evidence the good antiwear properties of the lubricants.

scholarly journals Emulsion of systems containing egg yolk, polysaccharides and vegetable oil

2012 ◽  
Vol 36 (5) ◽  
pp. 543-550 ◽  
Author(s):  
Clitor Junior Fernandes de Souza ◽  
Edwin Elard Garcia Rojas
Keyword(s):  
Fatty Acid ◽  
Droplet Size ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Xanthan Gum ◽  
Emulsion Stability ◽  
Egg Yolk ◽  
Emulsifying Properties ◽  
Emulsifying Activity ◽  
Excellent Stability

This work characterizes the emulsifying properties of systems containing egg yolk (0.1; 1.0 and 2.5 % w/v) and polysaccharides (xanthan gum, carrageen, pectin and carboxymethylcellulose) and three different vegetable oils (sunflower, canola, and palm oils). Emulsifying activity and emulsion stability were measured of each combination and it was found the effect of the oil on emulsion stability correlated to the amount of monounsaturated fatty acid. Additionally, increased egg yolk concentration increased emulsifying activity by reducing coalescence of oil droplets. Lastly, 2.5% egg yolk and 0.2% polysaccharide generated emulsions with high emulsifying activity, excellent stability, and droplet size of 4.32 µm.

scholarly journals Enzymatic Degumming of Rice Bran Oil Using Different Commercial Phospholipases and Their Cocktails

Life ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1197
Author(s):  
Mayara S. Rodrigues ◽  
Rafaela M. Dos Passos ◽  
Paula V. de A. Pontes ◽  
Marcela C. Ferreira ◽  
Antonio J. A. Meirelles ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
Vegetable Oil ◽  
Rice Bran ◽  
Phosphorus Content ◽  
Rice Bran Oil ◽  
Reaction Times ◽  
Oil Refining ◽  
Residual Phosphorus ◽  
Enzymatic Degumming

Rice bran oil is a highly nutritious vegetable oil, as it is rich in tocols and γ-oryzanol. Degumming is the first step in the vegetable oil refining process, and its main objective is the removal of phospholipids or gums. In the present study, enzymatic degumming trials were performed on crude rice bran oil using the phospholipases PLA1, Purifine® PLC, their mixture (PLA1/PLC), and a cocktail known as Purifine® 3G. Enzymatic degumming applying 50 mg/kg of PLA1 for 120 min resulted in a residual phosphorus content of 10.4 mg/kg and an absolute free fatty acid increase of 0.30%. Enzymatic degumming applying 300 mg/kg of Purifine® PLC for 120 min at 60 °C resulted in a residual phosphorus content of 67 mg/kg and an absolute diacylglycerol increase of 0.41%. The mixture of phospholipases and the cocktail presented approximately 5 mg/kg of residual phosphorus content after the reaction times. For all degumming processes, the preservation of minor components such as tocols and γ-oryzanol were observed. These results indicate that the use of enzyme mixtures or their cocktails to attain low phosphorus content and high diacylglycerol/free fatty acid conversion during enzymatic degumming is a viable alternative.

Thermal Behavior of Power Transformers Filled With Waste Vegetable Oil-Based Biodiesel Under Dynamic Load

2021 ◽  
Vol 143 (9) ◽  
Author(s):  
Ehsan Ebrahimnia-Bajestan ◽  
Hani Tiznobaik ◽  
Paul Gheorghe ◽  
Mohammad Arjmand
Keyword(s):  
Heat Flux ◽  
Ambient Temperature ◽  
Vegetable Oil ◽  
Dynamic Load ◽  
Renewable Resource ◽  
High Heat ◽  
Transformer Oil ◽  
Power Transformers ◽  
High Heat Flux ◽  
Aging Rate

Abstract Petroleum-based oils are widely used as electrically insulating materials in high voltage power transformers for dissipating high generated heat flux and maintaining the temperature below critical values. The operating temperature of a transformer dominantly governs its aging rate. In the present research, a renewable coolant as a versatile substitution for the petroleum-based oils was investigated to be employed in the cooling of transformers. The studied coolant is a vegetable-based oil extracted from the waste cooking oils. A numerical model was developed to follow the instantaneous changes in the load profile and ambient temperature and predict the instantaneous hotspot temperature values in the transformer under dynamic load. Then, this thermal model was used to explore the capability of the studied vegetable oil in the cooling of transformers compared with conventional transformer oil. The realistic ambient temperature and loading profile, as well as thermal properties of oils and characteristics of a transformer, were applied as the model’s inputs. The aging rate of the transformer in the presence of vegetable oil was also compared with the conventional transformer oil. The results indicate a better cooling performance for the vegetable-based oil, where a hotspot temperature reduction of 3 °C was observed in comparison to the petroleum-based oil. Also, the model predicts a significantly longer life for the insulating system of the transformer when the proposed vegetable-based oil is employed. The results of this research suggest a sustainable way of reusing the waste of a renewable resource as an alternative insulating liquid for the cooling of high heat flux electric/electronic devices.

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