Friction studies of hydrogel contact lenses using AFM: Non-crosslinked polymers of low friction at the surface

Seong Han Kim; Chris Marmo; Gabor A. Somorjai

doi:10.1016/S0142-9612(01)00175-2

Friction studies of hydrogel contact lenses using AFM: Non-crosslinked polymers of low friction at the surface

Seong Han Kim
, Chris Marmo
, Gabor A. Somorjai

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

The surface of soft contact lenses made of crosslinked poly(2-hydroxyethyl methacrylate), pHEMA, has been investigated with atomic force microscopy in contact mode. The friction force and adhesive force measurements were able to differentiate the non-crosslinked pHEMA chains from the surface of the crosslinked pHEMA networks. These non-crosslinked pHEMA chains at the surface were anchored to the crosslinked pHEMA network, most likely by entanglement and their surfaces were about 2-4nm higher than the surrounding surface in a dehydrated state. In saline solution, the surface friction and adhesive force of the contact lens were significantly reduced compared to those measured for the surface-dehydrated contact lens.

Original language	English (US)
Pages (from-to)	3285-3294
Number of pages	10
Journal	Biomaterials
Volume	22
Issue number	24
DOIs	https://doi.org/10.1016/S0142-9612(01)00175-2
State	Published - Dec 15 2001

All Science Journal Classification (ASJC) codes

Bioengineering
Ceramics and Composites
Biophysics
Biomaterials
Mechanics of Materials

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10.1016/S0142-9612(01)00175-2

Cite this

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title = "Friction studies of hydrogel contact lenses using AFM: Non-crosslinked polymers of low friction at the surface",

abstract = "The surface of soft contact lenses made of crosslinked poly(2-hydroxyethyl methacrylate), pHEMA, has been investigated with atomic force microscopy in contact mode. The friction force and adhesive force measurements were able to differentiate the non-crosslinked pHEMA chains from the surface of the crosslinked pHEMA networks. These non-crosslinked pHEMA chains at the surface were anchored to the crosslinked pHEMA network, most likely by entanglement and their surfaces were about 2-4nm higher than the surrounding surface in a dehydrated state. In saline solution, the surface friction and adhesive force of the contact lens were significantly reduced compared to those measured for the surface-dehydrated contact lens.",

author = "Kim, \{Seong Han\} and Chris Marmo and Somorjai, \{Gabor A.\}",

note = "Funding Information: This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Science Division, of the US Department of Energy under Contract No. DE-AC03-76SF00098. The authors also acknowledge support from Ocular Sciences Inc. ",

year = "2001",

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doi = "10.1016/S0142-9612(01)00175-2",

language = "English (US)",

volume = "22",

pages = "3285--3294",

journal = "Biomaterials",

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T1 - Friction studies of hydrogel contact lenses using AFM

T2 - Non-crosslinked polymers of low friction at the surface

AU - Kim, Seong Han

AU - Marmo, Chris

AU - Somorjai, Gabor A.

N1 - Funding Information: This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Science Division, of the US Department of Energy under Contract No. DE-AC03-76SF00098. The authors also acknowledge support from Ocular Sciences Inc.

PY - 2001/12/15

Y1 - 2001/12/15

N2 - The surface of soft contact lenses made of crosslinked poly(2-hydroxyethyl methacrylate), pHEMA, has been investigated with atomic force microscopy in contact mode. The friction force and adhesive force measurements were able to differentiate the non-crosslinked pHEMA chains from the surface of the crosslinked pHEMA networks. These non-crosslinked pHEMA chains at the surface were anchored to the crosslinked pHEMA network, most likely by entanglement and their surfaces were about 2-4nm higher than the surrounding surface in a dehydrated state. In saline solution, the surface friction and adhesive force of the contact lens were significantly reduced compared to those measured for the surface-dehydrated contact lens.

AB - The surface of soft contact lenses made of crosslinked poly(2-hydroxyethyl methacrylate), pHEMA, has been investigated with atomic force microscopy in contact mode. The friction force and adhesive force measurements were able to differentiate the non-crosslinked pHEMA chains from the surface of the crosslinked pHEMA networks. These non-crosslinked pHEMA chains at the surface were anchored to the crosslinked pHEMA network, most likely by entanglement and their surfaces were about 2-4nm higher than the surrounding surface in a dehydrated state. In saline solution, the surface friction and adhesive force of the contact lens were significantly reduced compared to those measured for the surface-dehydrated contact lens.

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JO - Biomaterials

JF - Biomaterials

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Friction studies of hydrogel contact lenses using AFM: Non-crosslinked polymers of low friction at the surface

Abstract

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