ORCID Profile
0000-0003-3433-620X
Current Organisation
The University of Auckland
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Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 07-2018
Publisher: MDPI AG
Date: 31-08-2022
Abstract: Polymeric hydrogels can be used as artificial replacement for lesioned cartilage. However, modulating the hydrogel formulation that mimics articular cartilage tissue with respect to mechanical and tribological properties has remained a challenge. This study encompasses the tribological evaluation of a silica nanoparticle (SNP) loaded bilayer nanocomposite hydrogel (NCH), synthesized using acrylamide, acrylic acid, and alginate via modulated free-radical polymerization. Multi-factor pin-on-plate sliding wear experiments were carried out with a steel ball counterface using a linear reciprocating tribometer. Tribological properties of NCHs with 0.6 wt% SNPs showed a significant improvement in the wear resistance of the lubricious layer and a low coefficient of friction (CoF). CoF of both non-reinforced hydrogel (NRH) and NCH at maximum contact pressure ranged from 0.006 to 0.008, which is in the order of the CoF of healthy articular cartilage. Interfacial surface energy was analysed according to Johnson, Kendall, and Robert’s theory, and NCHs showed superior mechanical properties and surface energy compared to NRHs. Lubrication regimes’ models were drawn based on the Stribeck chart parameters, and CoF results were highlighted in the elastoviscous transition regime.
Publisher: MDPI AG
Date: 18-06-2021
Abstract: The design and manufacture of artificial tissue for knee joints have been highlighted recently among researchers which necessitates an apt approach for its assessment. Even though most re-searches have focused on specific mechanical or tribological tests, other aspects have remained underexplored. In this review, elemental keys for design and testing artificial cartilage are dis-cussed and advanced methods addressed. Articular cartilage structure, its compositions in load-bearing and tribological properties of hydrogels, mechanical properties, test approaches and wear mechanisms are discussed. Bilayer hydrogels as a niche in tissue artificialization are presented, and recent gaps are assessed.
Publisher: Elsevier BV
Date: 04-2021
Publisher: Trans Tech Publications, Ltd.
Date: 08-2018
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.775.109
Abstract: Various hydrogels such as polyvinyl alcohol (PVA) and poly (2-hydroxyethyl methacrylate) were assessed as articular cartilage replacement in the past. In the current study, the biphasic, biocompatible, and mechanically tunable Polyacrylamide-Alginate (PAAm-Alg) hybrid hydrogel was evaluated with different parameters such as load, speed and lubrication to study friction and wear performance of the material. Dried mass loss of hydrogel with lubrication was in the range of 2-9 wt %. The average friction coefficient of hydrogel under bovine serum lubrication was measured as 0.03, which is fairly close to native cartilage tissue. SEM studies revealed adhesion as the dominant wear mechanism due to excessive plastic deformation, independent of load and speed condition while fatigue wear mechanism was more noticeable under 1.3MPa applied pressure. However, the lubrication has dramatically decreased the wear rate and as a result, it was difficult to distinguish the worn surface of hydrogel s les from the unworn surface and just a light depression was observed on the s les, which is promising for load-bearing applications such as cartilage replacement.
No related grants have been discovered for Ashveen Nand.