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Evaluation and characterization of lithium grease from Palm kernel oil for automobiles and industrial machinery

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Amanambu V. O., Nwadinigwe C. A.
World News of Natural Sciences
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2024
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vol. 53
120-129
EN
Grease is made up of a lubricant (typically petroleum oil) and a thickener (soap). The study focus on the production and characterization of grease for automobile and industrial machinery. The practicality and application of the technique were examined in order to decide whether the lithium grease produced from palm kernel oil might be used as an environmental friendly alternative to conventional grease. The aforementioned objective was achieved by mechanically extracting oil from palm kernel nuts. Lithium grease was produced through the saponification of lithium oxide with palm kernel oil. The lithium grease melting and drop points, flash point, and ash content were discussed. According to the study's findings, the lithium grease produced results that were acceptable and in accordance with ASTM standards, with the exception of its ash content, which will cause the grease to break off under pressure.
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Wpływ obciążenia rozciągającego na tłumienie wybranych tekstylnych linii transmisyjnych

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Kubiak P., Leśnikowski J.
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
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2017
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issue 15
15-29
EN
Artykuł porusza zagadnienia związane z pomiarami i analizą wpływu naprężeń me-chanicznych powstających przy rozciąganiu tekstylnych linii transmisyjnych, umiesz-czonych na płaskich wyrobach włókienniczych, na ich zdolności przesyłowe. Tek-stylne linie transmisyjne, zbudowane z elektroprzewodzących materiałów tekstyl-nych umieszczonych na podłożach włókienniczych, przeznaczone są do przesyłania sygnałów elektrycznych. Opisane badania obejmują pomiary parametru S21 w szero-kim zakresie częstotliwości sięgającym 5 GHz. Parametr ten odzwierciedla stopień tłumienia sygnału elektrycznego przechodzącego przez testowaną linię. W artykule przedstawiono wpływ działania długotrwałych naprężeń mechanicznych na parametr S21 trzech przykładowych linii transmisyjnych przed cyklem rozciągania i po nim.
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SYNTHESIS AND CHARACTERIZATION OF CHITOSAN/SODIUM ALGINATE BLEND MEMBRANE FOR APPLICATION IN AN ELECTROCHEMICAL CAPACITOR

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Nowacki K., Galiński M., Stępniak I.
Progress on Chemistry and Application of Chitin and its Derivatives
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2020
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vol. 25
174 - 191
EN
In this work, we report a stepwise formation method of a chitosan/sodium alginate polyelectrolyte complex (CS/SA PEC) membrane. The proposed method aiming at the utilization of the ultrasonic treatment of chitosan and sodium alginate solution allowed us to obtain a highly homogeneous hybrid membrane for electrochemical usage. The CS/SA PEC membrane saturated in a 2 M Li2SO4 aqueous solution was used in electrochemical double layer capacitor (EDLC) cell to study its applicability as quasi-solid electrolyte. Electrochemical characteristic of EDLC cells was determined by electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge methods. The results show that the EDLC cell with CS/SA PEC quasi-solid electrolyte exhibit a comparable specific capacitance (102 F g-1 for 0–0.8 V) to CS reference (100 F g-1 for 0–0.8 V) and commercial separator (99 F g-1 for 0–0.8 V) cells. Thus, the CS/SA PEC membrane can be considered as an alternative modification for chitosanbased materials of electrochemical purpose.
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