Friction Coefficient Measurement of Hydrogel Materials on Living Epithelial Cells

Dunn, Alison C.; Cobb, Jessica A.; Kantzios, Ana N.; Lee, Sung‐Jin; Sarntinoranont, Malisa; Tran‐Son‐Tay, Roger; Sawyer, W. Gregory

doi:10.1007/s11249-008-9306-5

Cited by 60 publications

(42 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No further analysis of elastic contact in the absence of adhesion for the Winkler foundation will be explicitly developed in this article as it has been done before by others [11,28,29]. This derivation is based on a conservation of energy, and it is therefore necessary to find an expression for the strain energy stored in the compressive region of contact, U 0 .…”

Section: Modeling Of Contact With Adhesion In the Compressive Contactmentioning

confidence: 99%

Energy, Adhesion, and the Elastic Foundation

Hill

Sawyer

2009

Tribol Lett

Self Cite

View full text Add to dashboard Cite

A theory for elastic contact adhesion between a rigid sphere and an elastic foundation is developed. The theory derives relationships between the contact deformation and the externally applied force. The derivation is based on elastic contact between a sphere and a thin linearelastic foundation in which the strain energies are balanced by the work of indentation and the change in surface energy. Contacting regimes where there is either compressive strain energy or only tensile strain energy (pull-off regime) are both treated. The model is non-dimensionalized and an order of magnitude analysis is performed in order to develop simplified closed form solutions; the simplified model is then evaluated and compared to the full solution. This theory finds that the adhesion force is significantly larger for an elastic foundation in which the surface elements act independently as compared to more traditional solutions for elastic solids. The theory gives an adhesion force of F adh ffi 7pRDc:

show abstract

Section: Modeling Of Contact With Adhesion In the Compressive Contactmentioning

confidence: 99%

Energy, Adhesion, and the Elastic Foundation

Hill

Sawyer

2009

Tribol Lett

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, issues concerning end-of-day comfort still exist [2]. Discomfort caused by contact lenses has been related to several factors such as dryness, protein adsorption, physiological factors and friction occurring during the blinking process, especially between the anterior side of the lens and the inner eyelid [3][4][5][6][7][8]. Clinical tests have been performed to understand and improve comfort, and have centered on the trial of different lens materials and ophthalmic solutions [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Friction Measurements on Contact Lenses in Their Operating Environment

et al. 2011

View full text Add to dashboard Cite

An important issue concerning the use of soft contact lenses is comfort, which, among other factors, has been related to the level of friction between the anterior side of the lens and the inner eyelid. Although several studies have been carried out to investigate the frictional properties of contact lenses, these have not taken the physiological environment of the eye into account. In use, lenses are in contact with proteins present in tears, with corneal cells and with the palpebral conjunctiva (clear membrane on inner eyelid). The focus of this study was to establish a biologically relevant measurement protocol for the investigation of friction of contact lenses that would mimic the eye's physiological environment. By optimizing parameters such as the composition of the friction counter surface, the lubricant solution, the normal load and the velocity, an ideal protocol and setup for microtribological testing could be established and used to perform a comparative study of various commercially available soft contact lenses.

show abstract

“…Hydrogel Friction -Hydrogels are readily observed to be very slippery and have been shown to have very low friction coefficient with glass or plastic substrates [22,23,24]. We mesure the friction coefficient of a hydrogel-hydrogel (HH) contact by stacking two dyed polyacrylamide hydrogel cubes (Educational Innovations) on top of each other in a demineralized water bath.…”

Section: Using Hydrogel Spheresmentioning

confidence: 99%