This work aimed to prepare and characterize cellulose nanocrystals as an additive to a water‐based lubricating fluid. Different concentrations of the cellulose nanocrystals suspensions (0.50–1.25%wt) were added to the lubricant fluid. The nanolubricants were submitted to the pin‐disk test. The rigid/severe electrodynamic lubrication regime was conducted under different rotation speeds (500 and 63 rpm) and external loads (8.47 and 1.77 N). The cellulose nanocrystals showed a high yield (74%), an aspect ratio from 23 to 35, and thermal stability at 219.0°C. The coefficient of friction increased from 4% to 97%) with the addition of the cellulose nanocrystals for the test at 500 rpm and decreased by up to 50% at 63 rpm both at 8.47 N. The wear rate reduced with increasing concentration of nanocrystals in the lubricant fluid, showing a reduction by up to 99% at 500 rpm–8.47 N compared with fluid without nanocrystals.
²Universidade Federal do Recôncavo da Bahia (UFRB/CETEC); Cruz das Almas/BA Resumo: Este trabalho traz um estudo sobre produção de nanopartículas de amido de mandioca (SNP), por hidrólise ácida, e sua eficiência como aditivo para lubrificantes. O nanolubrificante foi preparado utilizando o óleo Rocol® Ultracut 250, adicionado de SNP's em concentrações variadas (0,05, 0,5, 1,00 e 1,25% m/m). As nanopartículas foram caracterizadas através da análise do Potencial Zeta e TGA. Para o nanolubrificante (Rocol® Ultracut 250 + SNP), foi realizado o teste pino-disco, onde foram analisados o coeficiente de atrito (µ) e a taxa de desgaste (w), antes e depois da adição de SNP. A adição de nanopartículas de amido ao lubrificante apresentou melhorias significativas, como redução do coeficiente de atrito em torno de 30% e o aumento da taxa de desgaste em mais de 700%.
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