Temperature-sensitive tribological performance of titanium alloy lubricated with PNIPAM microgels

Xu, Yufu; Bao, Yichen; Liu, Zhichao; Zheng, Quan; Dong, Yinhui; Song, Ruhong; Yang, Baocheng

doi:10.1016/j.apsusc.2021.151392

Cited by 25 publications

(18 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This should be ascribed to the fact that the particle size of the microgels shrank at higher temperature due to the hydrophobic interaction of the molecular chain, which makes the microgels could easier to enter into the narrow sliding interfaces. Then, the microgel nanoparticles paly soft micro ball-bearing roles between the rubbing pairs (Xu et al, 2019a(Xu et al, , 2019bRudge et al, 2020;Xu et al, 2022). When the temperature exceeded the LCST of the microgels, the nanoparticle size decreased significantly, which helps more microgel additives play the lubrication role, thus the friction coefficient decreased dramatically.…”

Section: Temperature-sensitive Lubrication Behaviormentioning

confidence: 99%

Synthesis and temperature-sensitive lubrication behavior of PNIPAM microgels for titanium alloy

Sun

Zheng

et al. 2022

ILT

Self Cite

View full text Add to dashboard Cite

Purpose This paper aims to offeri novel nano-additives polymer microgels to precisely improve the lubrication properties of titanium alloy under different temperatures. Design/methodology/approach The surfactant-free emulsion polymerization method was used to prepare Poly(N-isoprolylacrylamide) (PNIPAM) microgels. A ball-on-disk tribometer was applied to investigated the temperature-sensitive lubrication behavior of PNIPAM microgels. Findings The results show that the as-prepared microgels are ball-like nanoparticles with the size of 50–900 nm. In addition, potassium persulfate as initiator, complete mixing technic and high sodium dodecyl sulfate (SDS) concentration contribute to the formation of microgels with small size. The tribosystem shows a lower friction coefficient with the lubrication of PNIPAM microgels as aqueous solution additives when the temperature exceeding the critical temperature. Originality/value This work reports the temperature-sensitive lubrication of PNIPAM microgels. The critical temperature of PNIPAM microgels could be regulated by the addition of SDS in the solutions. This offers an effective and facile strategy for regulation of the critical temperature of smart microgels, which is helpful for the smart lubrication in the future.

show abstract

Section: Temperature-sensitive Lubrication Behaviormentioning

confidence: 99%

Synthesis and temperature-sensitive lubrication behavior of PNIPAM microgels for titanium alloy

Sun

Zheng

et al. 2022

ILT

Self Cite

View full text Add to dashboard Cite

show abstract

“…The previous studies mainly focused on the traditional microgels or thermal-sensitive microgels [31,32]. In fact, the lubrication performance of the artificial joints is greatly affected by the pH values of the patient.…”

Section: Introductionmentioning

confidence: 99%

Tribological behavior of thermal- and pH-sensitive microgels under steel/CoCrMo alloy contacts

Sun

Dong

et al. 2022

Friction

Self Cite

View full text Add to dashboard Cite

The tribological behavior of 316L stainless steel/CoCrMo alloy contacts under aqueous lubrication was investigated in this work. Three types of microgels including poly(N-isopropylacrylamide) (PNIPAM), polyacrylic acid (PAA), and poly(N-isopropylacrylamide-co-acrylic acid) (PNIPAM-co-PAA) were prepared and used as lubricant additives in aqueous solutions. Tribological tests were conducted using a ball-on-disk reciprocating tribometer, over a range of temperatures, pH, and concentrations of the microgels. The PNIPAM-co-PAA microgels were proven to have excellent anti-friction and anti-wear properties, depending on the temperature and pH values of the solutions. The maximum friction coefficient coincided with the lower critical solution temperature of the PNIPAM-co-PAA microgels at 32 °C. At the same time, the friction coefficient increased with the increase in pH value of the lubricant solution with the PNIPAM-co-PAA microgels. The unique thermal- and pH-sensitive properties of the PNIPAM-co-PAA microgels provided a new strategy for controlling the friction and wear of steel/CoCrMo alloy contacts under aqueous lubrication.

show abstract

“…Thus, the good aqueous lubricating performance of the hybrid was attributed to the synergy of the hydration lubrication of surface-coated PNIPAm nanolayer and the "ball bearing" effect of nanoMOFs. [29,34,35] These results demonstrated that the aqueous lubrication of the nanoMOFs can be greatly improved by growing the PNIPAm microgel.…”

Section: Resultsmentioning

confidence: 96%

Construction of Core‐Shell NanoMOFs@microgel for Aqueous Lubrication and Thermal‐Responsive Drug Release

Liu

Gong

et al. 2022

Small

View full text Add to dashboard Cite

The construction of porous nanocarriers with good lubricating performance and stimuli‐responsive drug release is significant for the synergetic therapy of osteoarthritis (OA). Although metal‐organic framework nanoparticles (nanoMOFs) as carriers can support drug delivery, achieving the synergy of aqueous lubrication and stimuli‐responsive drug release is challenging. In this work, a core‐shell nanoMOFs@poly(N‐isopropylacrylamide) (PNIPAm) microgel hybrid via one‐pot soap‐free emulsion polymerization is developed. Programmable growth of the PNIPAm microgel layer on the surface of nanoMOFs is achieved by tuning the concentration of the monomer and the crosslinker in the reaction. Reversible swelling‐collapsing behaviors of the hybrid are realized by tuning the temperature below and above the lower critical solution temperature. When used as water lubrication additives, the hybrid enables reductions in both the coefficient of friction and wear volume. In vitro thermal‐responsive drug release is demonstrated on the diclofenac sodium‐loaded hybrid by controlling the swelling and collapsing states of the PNIPAm nanolayer. Moreover, the good biocompatibility of the hybrid is verified by culturing toward HeLa and BEAS‐2B cells. These results establish a nanoMOFs@microgel hybrid that can achieve friction and wear reduction and thermal‐responsive drug release.

show abstract

Temperature-sensitive tribological performance of titanium alloy lubricated with PNIPAM microgels

Cited by 25 publications

References 56 publications

Synthesis and temperature-sensitive lubrication behavior of PNIPAM microgels for titanium alloy

Synthesis and temperature-sensitive lubrication behavior of PNIPAM microgels for titanium alloy

Tribological behavior of thermal- and pH-sensitive microgels under steel/CoCrMo alloy contacts

Construction of Core‐Shell NanoMOFs@microgel for Aqueous Lubrication and Thermal‐Responsive Drug Release

Contact Info

Product

Resources

About