Tribological properties of hierarchical structure artificial joints with poly acrylic acid (AA) - poly acrylamide (AAm) hydrogel and Ti6Al4V substrate

Deng, Yaling; Sun, Jian‐Jun; Ni, Xingya; Bo, Yu

doi:10.1007/s10965-020-02143-z

Cited by 28 publications

(14 citation statements)

References 54 publications

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“…[ 28,32 ] The peaks at 1646, 1540, and 1236 cm −1 were identified as amide I (CO stretching vibrations), II (NH bending coupled with CN stretching vibrations), and III (NH bending coupled with CN stretching vibrations) bands, respectively. [ 5,33 ] Furthermore, the characteristic FTIR peaks of PAA (2, 100, and 450 kDa) such as the peak at 1716 cm −1 corresponding to carbonyl stretching vibrations of carboxylic groups and the peak at 1243 cm −1 associated with CO bonds in the carboxyl group (Figure S1) were not observed, [ 34,35 ] illustrating that no specific reaction occurred between collagen and PAA. The characteristic peaks of HAP were observed at 1035 and 560–604 cm −1 , and are marked as blue and gray bands (Figure 1A–C), respectively.…”

Section: Resultsmentioning

confidence: 99%

Molecular weight and concentration of poly (acrylic acid) dual‐responsive homogeneous and intrafibrillar collagen mineralization using an in situ co‐organization strategy

Shen

Zhang

et al. 2021

Polymer Composites

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Intrafibrillar mineralization is crucial in the synthesis of collagen-hydroxyapatite (HAP) composites with hierarchical structure resembling natural bone. The polymer-induced liquid precursor method, which involves immersing the matrix into polymer-stabilized amorphous calcium phosphate (ACP) solutions, has been widely used to regulate collagen mineralization; however, heterogeneous infiltration and crystallization of ACP precursors from the surface to the inner matrix remain a concern. In this study, the polymer-mediated co-organization strategy in which poly (acrylic acid) (PAA)-stabilized ACP solutions were initially introduced to collagen solutions before sol-gel transformation was employed to achieve homogeneous mineralization. Moreover, the effects of PAA with various molecular weights (2, 10, and 450 kDa) and concentrations (40, 80, and 120 mg/L) on collagen mineralization were evaluated. Increasing concentration and decreasing molecular weight both improved the stability of ACP precursors, which affected collagen mineralization. A lower concentration (40 mg/L) of 2 kDa PAA and higher concentration (80 and 120 mg/L) of 100 and 450 kDa PAA effectively retarded ACP crystallization, thereby inducing intrafibrillar mineralization.Extremely unstable ACP precursors failed to infiltrate the interior of fibrils using 100 and 450 kDa of PAA at 40 mg/L, resulting in extrafibrillar mineralization.Inversely, collagen fibrils were unmineralized until 7 days owing to excessive stability of ACP precursors using 2 kDa of PAA at higher concentrations. The present results further explain the mechanisms of intrafibrillar mineralization, and may provide a facile method for producing biomimetic materials.

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Section: Resultsmentioning

confidence: 99%

Molecular weight and concentration of poly (acrylic acid) dual‐responsive homogeneous and intrafibrillar collagen mineralization using an in situ co‐organization strategy

Shen

Zhang

et al. 2021

Polymer Composites

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“…Kelp protein depends on the stable structure formed by the hydrogen bond between C=O and N–H groups of different amino acids (Mierczynska-Vasilev et al , 2019). The peak of 402.4 eV reveals C–N and the 407.1 eV peak corresponds to NO 3 − (Jain et al , 2019; Deng et al , 2020).…”

Section: Resultsmentioning

confidence: 99%

Exploring the frictional characteristics of kelp liquid as an environmentally friendly lubricant

Yang

Wang

et al. 2022

ILT

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Purpose Kelp is widely productive and inexpensive. The purpose of this study is to explore kelp liquid (KL) as an environment-friendly water-based lubricant, which is expected to replace some industrial lubricants and protect the environment while satisfying lubricating performance. Design/methodology/approach In this experiment, the soaked kelp was broken up by a wall-breaking machine to get the KL by a centrifuge. Elements and crystal structure of KL samples were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and Raman spectra. The friction test is carried out by the relative movement of the polyethylene ball and the aluminum disk on the friction tester. Findings Friction experiments showed that 0.1 Wt.% KL has a good lubrication effect, and the average coefficient of friction is 0.063 under the condition of applying a 10 N load and moving at a speed of 2.0 cm/s. KL has good thermal conductivity with excellent cooling effect and high intermolecular force which makes high viscosity for excellent lubricating behavior, at the meantime molecules in solution remain stable which shows an excellent dispersibility. Originality/value At present, the research on kelp mainly focuses on its medicinal value and abundant nutritional value, and the research on its lubrication effect is less. Based on this situation, this paper explored the characteristics of KL as an environmentally friendly lubricant, which is expected to be used as a green cutting fluid.

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“…Human knee or hip joints are subjected to up to one million cycles of loading per year during daily activities [ 53 ]. The rupture of the anterior cruciate ligament (ACL), or meniscal tears, is attributed to joints’ misalignment, consequently affecting the joint kinematics, which increases the OA risk [ 54 ].…”

Section: Tribological Properties Of Articular Cartilagementioning

confidence: 99%

Articular and Artificial Cartilage, Characteristics, Properties and Testing Approaches—A Review

2021

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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.

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Tribological properties of hierarchical structure artificial joints with poly acrylic acid (AA) - poly acrylamide (AAm) hydrogel and Ti6Al4V substrate

Cited by 28 publications

References 54 publications

Molecular weight and concentration of poly (acrylic acid) dual‐responsive homogeneous and intrafibrillar collagen mineralization using an in situ co‐organization strategy

Molecular weight and concentration of poly (acrylic acid) dual‐responsive homogeneous and intrafibrillar collagen mineralization using an in situ co‐organization strategy

Exploring the frictional characteristics of kelp liquid as an environmentally friendly lubricant

Articular and Artificial Cartilage, Characteristics, Properties and Testing Approaches—A Review

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