Tribological behavior of three fatty acid ionic liquids in the lubrication of different material pairs

Publication date: Available online 13 October 2019Source: Journal of Molecular LiquidsAuthor(s): N. Rivera, A. García, A. Fernández-González, D. Blanco, R. González, A. Hernández BattezAbstractTribological behavior of three Fatty Acid anion-based Ionic Liquids (FAILs) with the same ammonium cation ([N8881]) and different anions ([C16:0], [C12:0] and [C8:0]) were studied. Four different tribopairs (steel-steel, aluminum-steel, bronze-steel and tungsten carbide-steel) were tested for each FAIL using a ball-on-disc reciprocating test for 30 min (room temperature, 50 N-load, 4 mm of stroke length, and 15 Hz-frequency). Aluminum and tungsten carbide surfaces did not show evidence of oxidation changes, contact pressure and hardness being, respectively, the main parameters controlling tribological behavior. Bronze and steel samples showed surface oxidation changes during tests, which influenced friction and/or wear results. An increase in alkyl chain length of the anion led to an increase in tin oxidation of bronze and the formation of a low friction film of Fe3O4 on steel.
Source: Journal of Molecular Liquids - Category: Molecular Biology Source Type: research

Related Links:

Ishaemic stroke (IS) in the paediatric population is extremely rare. In this age group, the occurrence of IS often concurs with underlying congenital heart disease, haematological, metabolic or immunological conditions. In contrast, the association between...
Source: SafetyLit - Category: International Medicine & Public Health Tags: Age: Infants and Children Source Type: news
ConclusionsIn this observational analysis of T2D and ASCVD, baseline β-blocker use was not associated with risks for severe hypoglycemia yet also was not associated with CV risk reduction over 3 years of follow-up, supporting a randomized examination of chronic β-blocker therapy in this patient population. (TECOS number, NCT00790205).
Source: American Heart Journal - Category: Cardiology Source Type: research
CONCLUSION: Screening for anxiety is recommended even during the acute phase of stroke, considering its independent detrimental effect on functional prognosis. Screening for anxiety during the chronic phase is also encouraged, as this may reflect the functional status of stroke. PMID: 31698556 [PubMed - as supplied by publisher]
Source: Psychiatry Investigation - Category: Psychiatry Tags: Psychiatry Investig Source Type: research
Authors: Burda R, Morochovič R, Némethová M, Burda J Abstract The aim of this study was to verify the possibility of preparation and effectiveness of the use of blood plasma containing an effector of ischemic tolerance activated by applying two sublethal stresses to a donor. As sublethal stresses, two periods of 20-minute hindlimb ischemia were used with a two-day interval between them. Active plasma was isolated six hours after the second hindlimb ischemia. The effectiveness of active plasma as well as remote postconditioning was tested after three hours of tourniquet-induced ischemia on the gastroc...
Source: Journal of Plastic Surgery and Hand Surgery - Category: Surgery Tags: J Plast Surg Hand Surg Source Type: research
CONCLUSION: Dyslipidemia patients with pre-existing depression had increased risk for CVD. Future studies that determine CVD risk after management of depression among dyslipidemia patients are needed. PMID: 31701694 [PubMed - as supplied by publisher]
Source: Diabetes and Metabolism Journal - Category: Endocrinology Tags: Diabetes Metab J Source Type: research
AbstractObjectivePosterior circulation ischemic stroke (PCiS) constitutes 20 –30% of ischemic stroke cases. Detailed information about differences between PCiS and anterior circulation ischemic stroke (ACiS) remains scarce. Such information might guide clinical decision making and prevention strategies. We studied risk factors and ischemic stroke subtypes in PCiS vs. ACiS and lesion location on magnetic resonance imaging (MRI) in PCiS.MethodsOut of 3,301 MRIs from 12 sites in the National Institute of Neurological Disorders and Stroke (NINDS) Stroke Genetics Network (SiGN), we included 2,381 cases with acute DWI lesi...
Source: Journal of Neurology - Category: Neurology Source Type: research
Conclusion: Our meta-analysis suggests that GFAP has a promising diagnostic accuracy for the differentiation of ICH from IS and mimics. Further, phase II and phase III diagnostic test studies are required to validate the findings before using GFAP as a blood based biomarker for clinical use.Trial Registration: This study was registered in OSF registries 10.17605/OSF.IO/B9JP4. PMID: 31702405 [PubMed - as supplied by publisher]
Source: Biomarkers - Category: Research Tags: Biomarkers Source Type: research
In conclusion, high-dose NR induces the onset of WAT dysfunction, which may in part explain the deterioration of metabolic health. Towards a Rigorous Definition of Cellular Senescence The accumulation of lingering senescent cells is a significant cause of aging, disrupting tissue function and generating chronic inflammation throughout the body. Even while the first senolytic drugs capable of selectively destroying these cells already exist, and while a number of biotech companies are working on the productio...
Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
DiscussionCMDs, especially when comorbid, are associated with increased dementia risk; however, leisure activities and social integration mitigate this risk.
Source: Alzheimer's and Dementia: The Journal of the Alzheimer's Association - Category: Geriatrics Source Type: research
Conclusion: VEGFR-TKIs are associated with a small increase in risk of patients developing hypertension, arterial thrombotic events, thrombocytopenia, and bleeding. Previous studies overestimated the actual risk associated with VEGFR-TKIs by analyzing the outcome with the lower baseline risk. PMID: 31698959 [PubMed - as supplied by publisher]
Source: Expert Opinion on Drug Safety - Category: Drugs & Pharmacology Tags: Expert Opin Drug Saf Source Type: research
More News: Molecular Biology | Stroke