Insight into the Lubrication Behavior of Phospholipids Pre-adsorbed on Silica Surfaces at Different Adsorption Temperatures
| Autor: | Jinjin Li, Yuhong Liu, Shizhu Wen, Hongdong Wang, Shaofei Feng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Bilayer Vesicle Shear force technology industry and agriculture Phospholipid 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Solvation shell Adsorption chemistry Chemical engineering Electrochemistry Lubrication Shear strength lipids (amino acids peptides and proteins) General Materials Science 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir. 36:13477-13484 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Phospholipids, as essential components in joint synovial fluid, play a dominant role in joint lubrication. In this study, atomic force microscopy was used to evaluate the normal and shear forces between two surfaces bearing three types of phospholipids with different acyl chain lengths, which were pre-adsorbed onto silica surfaces at different temperatures (25, 45, and 60 °C). When the pre-adsorption temperature was below the phospholipid phase transition temperature (Tm), a super-low friction coefficient [1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC): 0.002; 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC): 0.007] between two opposing silica surfaces in water was achieved because of the super-low shear strength of the hydration shell and robustness of the vesicle when the load was less than the critical value (DSPC: 500 nN; DPPC: 85 nN). However, when the pre-adsorption temperature exceeded Tm, the silica surface was covered by a bilayer structure with many defects, which exhibited poor adsorption density and low bearing capacity, resulting in a relatively high friction coefficient. This study gains insights into the influence of structure and temperature on the lubrication mechanism of phospholipids as biolubricants, providing guidance for the application of artificial joint synovial fluid. |
| Databáze: | OpenAIRE |
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