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Improved mechanical and tribological properties of PAAm/PVA hydrogel-Ti6Al4V alloy configuration for cartilage repair. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03355-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Tribological and Rheological Properties of Poly(vinyl alcohol)-Gellan Gum Composite Hydrogels. Polymers (Basel) 2022; 14:polym14183830. [PMID: 36145975 PMCID: PMC9501534 DOI: 10.3390/polym14183830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 08/23/2022] [Accepted: 09/08/2022] [Indexed: 12/02/2022] Open
Abstract
Polymeric poly(vinyl alcohol) (PVA)-based composite hydrogels are promising materials with various biomedical applications. However, their mechanical and tribological properties should be tailored for such applications. In this study, we report the fabrication of PVA-gellan gum (GG) composite hydrogels and determine the effect of GG content on their rheological and tribological properties. The rheology tests revealed an enhanced storage (elastic) modulus with increased gellan gum (GG) concentration. The results showed up to 89% enhancement of the elastic modulus of PVA by adding 0.5 wt% gellan gum. This elastic modulus (12.1 ± 0.8 kPa) was very close to that of chondrocyte and its surrounding pericellular matrix (12 ± 1 kPa), rendering them ideal for cartilage regeneration applications. Furthermore, the friction coefficient was reduced by up to 80% by adding GG to PVA, demonstrating the increased elastic modulus improved chance of survival under mechanical shear stresses. Examining PVA/GG at different concentrations of 0.1, 0.3, and 0.5 wt% of GG, we demonstrate that at a load of 5 N, the friction coefficient decreases by increasing the GG concentration. However, at higher loads of 10 and 15 N, a 0.3 wt% concentration was sufficient to significantly reduce the friction coefficient. For PVA and PVA/GG composites, we observed a reduction in friction coefficient by increasing the load from 5 to 15 N. We also found the friction to be independent of the sliding velocity. Possible mechanisms of achieving a reduced friction coefficient are discussed.
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Xiao F, Tang J, Huang X, Kang W, Zhou G. A robust, low swelling, and lipid-lubricated hydrogel for bionic articular cartilage substitute. J Colloid Interface Sci 2022; 629:467-477. [DOI: 10.1016/j.jcis.2022.08.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 08/21/2022] [Accepted: 08/24/2022] [Indexed: 11/28/2022]
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Şarkaya K, Akıncıoğlu G, Akıncıoğlu S. Investigation of tribological properties of HEMA-based cryogels as potential articular cartilage biomaterials. POLYM-PLAST TECH MAT 2022. [DOI: 10.1080/25740881.2022.2039190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Affiliation(s)
- Koray Şarkaya
- Pamukkale University, Department of Chemistry, Faculty of Science and Art, Denizli, Turkey
| | - Gülşah Akıncıoğlu
- Duzce University, Department of Machine Design and Construction, Duzce, Turkey
| | - Sıtkı Akıncıoğlu
- Duzce University, Department of Machine Design and Construction, Duzce, Turkey
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Desai N, Masen M, Cann P, Hanson B, Tuleu C, Orlu M. Modernising Orodispersible Film Characterisation to Improve Palatability and Acceptability Using a Toolbox of Techniques. Pharmaceutics 2022; 14:pharmaceutics14040732. [PMID: 35456566 PMCID: PMC9029462 DOI: 10.3390/pharmaceutics14040732] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/19/2022] [Accepted: 03/28/2022] [Indexed: 12/10/2022] Open
Abstract
Orodispersible films (ODFs) have been widely used in paediatric, geriatric and dysphagic patients due to ease of administration and precise and flexible dose adjustments. ODF fabrication has seen significant advancements with the move towards more technologically advanced production methods. The acceptability of ODFs is dependent upon film composition and process of formation, which affects disintegration, taste, texture and mouthfeel. There is currently a lack of testing to accurately assess ODFs for these important acceptability sensory perceptions. This study produced four ODFs formed of polyvinyl alcohol and sodium carboxymethylcellulose using 3D printing. These were assessed using three in vitro methods: Petri dish and oral cavity model (OCM) methods for disintegration and bio-tribology for disintegration and oral perception. Increasing polymer molecular weight (MW) exponentially increased disintegration time in the Petri dish and OCM methods. Higher MW films adhered to the OCM upper palate. Bio-tribology analysis showed that films of higher MW disintegrated quickest and had lower coefficient of friction, perhaps demonstrating good oral perception but also stickiness, with higher viscosity. These techniques, part of a toolbox, may enable formulators to design, test and reformulate ODFs that both disintegrate rapidly and may be better perceived when consumed, improving overall treatment acceptability.
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Affiliation(s)
- Neel Desai
- Research Department of Pharmaceutics, UCL School of Pharmacy, University College London, London WC1N 1AX, UK;
- Correspondence: (N.D.); (M.O.)
| | - Marc Masen
- Tribology Group, Department of Mechanical Engineering, Imperial College London, London SW7 9AG, UK; (M.M.); (P.C.)
| | - Philippa Cann
- Tribology Group, Department of Mechanical Engineering, Imperial College London, London SW7 9AG, UK; (M.M.); (P.C.)
| | - Ben Hanson
- UCL Mechanical Engineering, University College London, London WC1E 7JE, UK;
| | - Catherine Tuleu
- Research Department of Pharmaceutics, UCL School of Pharmacy, University College London, London WC1N 1AX, UK;
| | - Mine Orlu
- Research Department of Pharmaceutics, UCL School of Pharmacy, University College London, London WC1N 1AX, UK;
- Correspondence: (N.D.); (M.O.)
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Chen Y, Song J, Wang S, Liu W. PVA-Based Hydrogels: Promising Candidates for Articular Cartilage Repair. Macromol Biosci 2021; 21:e2100147. [PMID: 34272821 DOI: 10.1002/mabi.202100147] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 06/07/2021] [Indexed: 12/16/2022]
Abstract
The complex, gradient physiological structure of articular cartilage is a severe hindrance of its self-repair, leaving the clinical treatment of cartilage defects a demanding issue to be addressed. Currently applied tissue engineering treatments and traditional non-tissue engineering treatments have different limitations, for example, cell dedifferentiation, immune rejection, and prosthesis-related complications. Thus, studies have been focusing on seeking promising candidates for novel cartilage repair methods. Polyvinyl alcohol (PVA) hydrogels with excellent biocompatibility and tunable material properties have become the alternatives. For pure PVA hydrogels, the mechanical strength and lubricity are not capable of replacing articular cartilage until proper modifications are done. This paper summarizes the research progress in PVA hydrogels, including the preparation, modification, and cartilage-repair-aimed biomimetic improvements. Design guidance of PVA hydrogels is put forward as assistance to functional hydrogel preparation. Finally, the prospects and main obstacles of PVA hydrogels are discussed.
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Affiliation(s)
- Yuru Chen
- Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China
| | - Jian Song
- School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, 510006, China
| | - Song Wang
- Biomechanics and Biotechnology Lab, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China
| | - Weiqiang Liu
- Biomechanics and Biotechnology Lab, Research Institute of Tsinghua University in Shenzhen, Shenzhen, 518057, China.,Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
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Porte E, Cann P, Masen M. A lubrication replenishment theory for hydrogels. SOFT MATTER 2020; 16:10290-10300. [PMID: 33047773 DOI: 10.1039/d0sm01236j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Hydrogels are suggested as less invasive alternatives to total joint replacements, but their inferior tribological performance compared to articular cartilage remains a barrier to implementation. Existing lubrication theories do not fully characterise the friction response of all hydrogels, and a better insight into the lubrication mechanisms must be established to enable optimised hydrogel performance. We therefore studied the lubricating conditions in a hydrogel contact using fluorescent imaging under simulated physiological sliding conditions. A reciprocating configuration was used to examine the effects of contact dimension and stroke length on the lubricant replenishment in the contact. The results show that the lubrication behaviour is strongly dependent on the contact configurations; When the system operates in a 'migrating' configuration, with the stroke length larger than the contact width, the contact is uniformly lubricated and shows low friction; When the contact is in an 'overlapping' configuration with a stroke length smaller than the contact width, the contact is not fully replenished, resulting in high friction. The mechanism of non-replenishment at small relative stroke length was also observed in a cartilage contact, indicating that the theory could be generalised to soft porous materials. The lubrication replenishment theory is important for the development of joint replacement materials, as most physiological joints operate under conditions of overlapping contact, meaning steady-state lubrication does not necessarily occur.
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Affiliation(s)
- Elze Porte
- Tribology Group, Department of Mechanical Engineering, Imperial College London, SW7 2AZ, UK
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Shi Y, Li J, Xiong D, Li L, Liu Q. Mechanical and tribological behaviors of
PVA
/
PAAm
double network hydrogels under varied strains as cartilage replacement. J Appl Polym Sci 2020. [DOI: 10.1002/app.50226] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Yan Shi
- College of Materials and Metallurgy Guizhou University Guiyang China
- Tribology Group, Department of Mechanical Engineering Imperial College London London UK
| | - Jianliang Li
- School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing China
| | - Dangsheng Xiong
- School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing China
| | - Long Li
- College of Materials and Metallurgy Guizhou University Guiyang China
| | - Qibin Liu
- College of Materials and Metallurgy Guizhou University Guiyang China
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Lin W, Kluzek M, Iuster N, Shimoni E, Kampf N, Goldberg R, Klein J. Cartilage-inspired, lipid-based boundary-lubricated hydrogels. Science 2020; 370:335-338. [DOI: 10.1126/science.aay8276] [Citation(s) in RCA: 82] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 05/10/2020] [Accepted: 08/06/2020] [Indexed: 12/17/2022]
Abstract
The lubrication of hydrogels arises from fluid or solvated surface
phases. By contrast, the lubricity of articular cartilage, a complex
biohydrogel, has been at least partially attributed to nonfluid,
lipid-exposing boundary layers. We emulated this behavior in synthetic
hydrogels by incorporating trace lipid concentrations to create a
molecularly thin, lipid-based boundary layer that renews continuously. We
observed a 80% to 99.3% reduction in friction and wear relative to the
lipid-free gel, over a wide range of conditions. This effect persists when
the gels are dried and then rehydrated. Our approach may provide a method
for sustained, extreme lubrication of hydrogels in applications from tissue
engineering to clinical diagnostics.
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Affiliation(s)
- Weifeng Lin
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Monika Kluzek
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Noa Iuster
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Eyal Shimoni
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Nir Kampf
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ronit Goldberg
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Jacob Klein
- Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel
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