Frequency response of quartz crystal shear-resonator during an adhesive, elastic contact in a surface forces apparatus

2002 ◽  
Vol 92 (11) ◽  
pp. 6905-6910 ◽  
Author(s):  
Steffen Berg ◽  
Diethelm Johannsmann ◽  
Marina Ruths
Keyword(s):  
Frequency Response ◽  
Quartz Crystal ◽  
Surface Forces ◽  
Elastic Contact ◽  
Surface Forces Apparatus

scholarly journals Glycosaminoglycans and glycoproteins influence the elastic response of synovial fluid nanofilms on model oxide surfaces

2021 ◽  
Author(s):  
Amar S. Mann ◽  
Ariell M. Smith ◽  
Joyce O. Saltzherr ◽  
Arvind Gopinath ◽  
Roberto C. Andresen Eguiluz
Keyword(s):  
Synovial Fluid ◽  
Quartz Crystal ◽  
Tribological Performance ◽  
Surface Forces ◽  
Elastic Response ◽  
Surface Forces Apparatus ◽  
Implant Surface ◽  
Load Bearing ◽  
Synergistic Interactions ◽  
Insight Into

Synovial fluid (SF) is the natural lubricant found in articulated joints, providing unique cartilage surface protecting films under confinement and relative motion. While it is known that the synergistic interactions of the macromolecular constituents provide its unique load-bearing and tribological performance, it is not fully understood how two of the main constituents, glycosaminoglycans (GAGs) and glycoproteins, regulate the formation and mechanics of robust load-bearing films. Here, we present evidence that the load-bearing capabilities, rather than the tribological performance, of the formed SF films depend strongly on its components' integrity. For this purpose, we used a combination of enzymatic treatments, quartz crystal microbalance with dissipation (QCM-D) and the surface forces apparatus (SFA) to characterize the formation and load-bearing capabilities of SF films on model oxide (i.e., silicates) surfaces. We find that, upon cleavage of proteins, the elasticity of the films is reduced and that cleaving GAGs results in irreversible (plastic) molecular re-arrangements of the film constituents when subjected to confinement. Understanding thin film mechanics of SF can provide insight into the progression of diseases, such as arthritis, but may also be applicable to the development of new implant surface treatments or new biomimetic lubricants.

Imaging the condensation and evaporation of molecularly thin ethanol films with surface forces apparatus

2014 ◽  
Vol 85 (1) ◽  
pp. 013702 ◽  
Author(s):  
Gutian Zhao ◽  
Qiyan Tan ◽  
Li Xiang ◽  
Di Zhang ◽  
Zhonghua Ni ◽  
...  
Keyword(s):  
Surface Forces ◽  
Surface Forces Apparatus

Understanding the molecular interactions of lipopolysaccharides during E. coli initial adhesion with a surface forces apparatus

Soft Matter ◽  
2011 ◽  
Vol 7 (19) ◽  
pp. 9366 ◽  
Author(s):  
Qingye Lu ◽  
Jing Wang ◽  
Ali Faghihnejad ◽  
Hongbo Zeng ◽  
Yang Liu
Keyword(s):  
Molecular Interactions ◽  
Surface Forces ◽  
Surface Forces Apparatus ◽  
E Coli ◽  
Initial Adhesion

Surface Forces Apparatus

2016 ◽  
pp. 3925-3935
Author(s):  
Carlos Drummond ◽  
Marina Ruths
Keyword(s):  
Surface Forces ◽  
Surface Forces Apparatus
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