Abstract
Friction on charged and neutral soft natural matter surfaces
Highlights
The two natural surfaces charged with the same sign and sliding against one another require better understanding [1,2,3,4]
Tests for curves 3, 4 and 5 were carried out after the IEP using pairs of negatively charged cartilage surfaces (-PO4- /-PO4-), while curve 6 was obtained at pH ~ 4.5 using cartilage surfaces at IEP with no net electrical charges (NH3+ (CH2)n PO4- R1R2) (Figure 2A)
The changes of AC charge density were caused by the variation of pH of the buffer solution, which produced different charge densities of articular cartilage
Summary
The two natural surfaces charged with the same sign and sliding against one another require better understanding [1,2,3,4]. Due to this, using the lamellar repulsion model, the strong dependence of the friction from both the cartilage surface charge density and the surface wettability [1,5] is supporting (cartilage/cartilage) friction. The natural cartilage of animal joints has very low friction for the sliding velocity - a few centimeters per second under a load of 18 MPa [6]. Liposomes and lamellar phases are composite structures made of phospholipids in synovial fluid and bilayers adsorbed on cartilage surface. The two models for natural cartilage surfaces boundary lubrication at different pH imparted by phospholipids bilayers on cartilage surface are given by Figure 1
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