This research investigated biofluid lubrication related to artificial joints usingtribological and rheological approaches. Biofluids studied here represent two categoriesof fluids, base fluids and nanostructured biofluids. Base fluids were studied throughcomparison of synthetic fluids (simulated body fluid and hyaluronic acid) as well asnatural biofluids (from dogs, horses, and humans) in terms of viscosity and fluid shearstress. The nano-structured biofluids were formed using molecules having well-definedshapes. Understanding nano-structured biofluids leads to new ways of design andsynthesis of biofluids that are beneficial for artificial joint performance.Experimental approaches were utilized in the present research. This includesbasic analysis of biofluids? property, such as viscosity, fluid shear stress, and shear rateusing rheological experiments. Tribological investigation and surface characterizationwere conducted in order to understand effects of molecular and nanostructures on fluidlubrication. Workpiece surface structure and wear mechanisms were investigated using a scanning electron microscope and a transmission electron microscope. The surfacetopography was examined using a profilometer.The results demonstrated that with the adding of solid additives, such as crownether or fullerene acted as rough as the other solids in the 3-body wear systems. Inaddition, the fullerene supplied low friction and low wear, which designates thelubrication purpose of this particular particle system.This dissertation is constructed of six chapters. The first chapter is anintroduction to body fluids, as mentioned earlier. After Chapter II, it examines themotivation and approach of the present research, Chapter III discusses the experimentalapproaches, including materials, experimental setup, and conditions. In Chapter IV,lubrication properties of various fluids are discussed. The tribological properties andperformance nanostructured biofluids are discussed in Chapter V, followed by summaryand conclusions in Chapter VI.
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