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Tribological behavior of ammonium-based protic ionic liquid as lubricant additive

Friction 2021年第1期9卷 169-178页

作者： Hong GUO patricia iglesias Mechanical Engineering Department Rochester Institute of TechnologyNew York 14623-5603USA

In this study, the tribological behavior of an ammonium-based protic ionic liquid(PIL) as an additive in a base mineral oil(MO) is investigated on a steel–steel contact at room temperature and 100℃. Tri-[bis(2-hydroxyethylammonium)] citrate(DCi) was synthesized in a simple and low-cost way, and the ionic structure of DCi was confirmed by proton nuclear magnetic resonance(^(1)H NMR). The stability measurement of 1 wt% DCi to a MO was investigated, and the lubricating ability and anti-wear properties of DCi as an additive in MO were also examined using a custom-designed reciprocating ball-on-flat tribometer. Optical microscope and profilometry were used to obtain the worn morphology of the steel disks. Scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS) were carried out to investigate the wear mechanism and to analyze the surface interactions between the rubbing components. When 1 wt% DCi is added into the base MO, frictional performance is improved at both temperatures studied with a friction reduction of 29.0% and 35.5%, respectively. Moreover, the addition of 1 wt% DCi to MO reduced the wear volume 59.4% compared to the use of MO. An oxygen-richened tribolayer is confirmed by EDS on the disk surface when DCi was used as additive under 100℃.

关键词： protic ionic liquid(PIL) tri-[bis(2-hydroxyethylammonium)]citrate(DCi) steel–steel friction wear

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Angiogenic peptide hydrogels for treatment of traumatic brain injury

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Bioactive Materials 2020年第1期5卷 124-132页

作者： Xiaotang Ma Agnieszka Agas Zain Siddiqui KaKyung Kim patricia iglesias-Montoro Jagathi Kalluru Vivek Kumar James Haorah Department of Biomedical Engineering Center for Injury Bio-MechanicsMaterials and MedicineNew Jersey Institute of TechnologyNewarkNJ07102USA Department of Chemical and Materials Engineering New Jersey Institute of TechnologyNewarkNJ07102USA Department of Restorative Dentistry Rutgers School of Dental MedicineNewarkNJUSA

Traumatic brain injury(TBI)impacts over 3.17 million *** of hemorrhage and coagulation caused by vascular disruption after TBI is critical for the recovery of *** pathologies play an important role in the underlying mechanisms of *** objective of this study is to evaluate a novel regenerative medicine for the injured tissue after brain *** utilized a recently described synthetic growth factor with angiogenic potential to facilitate vascular growth in situ at the injury *** work has shown how this injectable self-assembling peptide-based hydrogel(SAPH)creates a regenerative microenvironment for neovascularization at the injury *** assembly allows for thixotropy;the injectable drug delivery system provides sustained in vivo *** this study,a moderate blunt injury model was used to cause physical vascular damage and *** angiogenic SAPH was then applied directly on the injured rat *** day 7 post-TBI,significantly more blood vessels were observed than the sham and injury control group,as well as activation of VEGF-receptor 2,demonstrating the robust angiogenic response elicited by the angiogenic *** markers von-Willebrand factor(vWF)andα-smooth muscle actin(α-SMA)showed a concomitant increase with blood vessel density in response to the angiogenic ***,blood brain barrier integrity and blood coagulation were also examined as the parameters to indicate wound recovery post *** rescue examination by NeuN and myelin basic protein staining showed that the angiogenic SAPH may provide and neuroprotective benefit in the long-term recovery.

关键词： Traumatic brain injury Cerebrovascular injury Regenerative medicine Angiogenesis Self-assembling peptide hydrogels

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