AFM and SFG studies of pHEMA-based hydrogel contact lens surfaces in saline solution: adhesion, friction, and the presence of non-crosslinked polymer chains at the surface

Kim, Seong Han; Opdahl, Aric; Marmo, Chris; Somorjai, Gábor A.

doi:10.1016/s0142-9612(01)00292-7

Cited by 141 publications

(127 citation statements)

References 45 publications

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“…Observations were made using both Scanning Electron Microscopy (SEM) and AFM, indicating that cast-molded lenses show lower root-meansquare (RMS) roughness values, in agreement with the results of Rabke et al [1] and Grobe et al [2]. Kim et al [4,5] investigated the surface of hydrogel pHEMA-based CLs by using AFM and measuring the friction and adhesive forces. They found that in saline solution these magnitudes were significantly reduced, compared to those measured for the surface-dehydrated state.…”

Section: Introductionsupporting

confidence: 79%

“…These studies clearly show that the fabrication technique has a notable influence on the lens roughness, being the cast-molded lenses those showing lower Rq values. Kim et al [4,5] also reported values of Rq in pHEMA-based hydrogel lenses ranging from 8 to 23 nm.…”

Section: Topographic Analysismentioning

confidence: 98%

“…The Atomic Force Microscopy (AFM) is a technique that becomes useful to determine these properties, as was pointed out in an earlier work by Rabke et al [1]. Consequently, several authors [2][3][4][5][6][7][8][9][10][11][12][13][14][15] performed studies on CLs and using the AFM technique, but none of them used the Peak Force Quantitative Nanomechanics mode to determine the nanomechanical properties, such as the adhesion or the Young modulus, also named elastic modulus.…”

Section: Introductionmentioning

confidence: 99%

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AFM in mode Peak Force applied to the study of un-worn contact lenses

Torrent‐Burgués

Sanz

2014

Colloids and Surfaces B: Biointerfaces

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Contact lenses (CLs) are of common use and the biocompatibility, topography and mechanical properties of the used materials are of major importance. The objective of this contribution is to apply the AFM in mode Peak Force to obtain surface topography and mechanical characteristics of un-worn CLs of different materials. One material of hydrogel, two of siloxane-hydrogel and one of rigid gas permeable, were used in the There is no significant influence of the environment, water or saline solution, on the measured properties.

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Section: Introductionsupporting

confidence: 79%

Section: Topographic Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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AFM in mode Peak Force applied to the study of un-worn contact lenses

Torrent‐Burgués

Sanz

2014

Colloids and Surfaces B: Biointerfaces

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“…The method has the advantages that it avoids artefacts due to dehydration and coating (Bhatia et al, 1997;Kim et al, 2002), and allows for non-destructive surface topography and roughness measurements. AFM consists of a microscale cantilever with a sharp tip (probe) that is used to scan the specimen surface.…”

Section: Atomic Force Microscopymentioning

confidence: 99%

“…AFM is a very powerful tool for high resolution examination of hydrated CL surface structure. The method avoids artifacts due to dehydration and coating (Bhatia et al, 1997;Kim et al, 2002). However, when using AFM to analyse CL surface the area of measurement is very small, so it may be answered how representative of the total lens are Ra and Rms obtained by AFM.…”

Section: Atomic Force Microscopymentioning

confidence: 99%

Hydrogel Contact Lenses Surface Roughness and Bacterial Adhesion

Giráldez¹,

Yebra‐Pimentel²

2012

Ocular Diseases

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Atomic Force Microscopy–AFM

Eaton

2011

Kirk-Othmer Encyclopedia of Chemical Technology

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Atomic force microscopy is a powerful, high‐resolution technique capable of recording topographic images of a wide variety of samples. Two key strengths of AFM are its ability to produce images in almost any environment—in air, vacuum, or solvent—and to measure a wide variety of physical properties of the sample. First, this article discusses how the atomic force microscope operates, beginning with a background and general principles and then describing all the major components of the atomic force microscope. Second, all the most commonly used modes of AFM are described, including contact and oscillating modes; lateral force microscopy; modes that measure mechanical properties, magnetic force microscopy, and electrical modes; and force spectroscopy and nanoindentation. Finally, several example applications are given with the focus on measurements with particular relevance to chemistry. These include electrochemical AFM, high‐resolution imaging, measurement of molecular interactions, AFM‐based nanolithography, and characterization of heterogeneity in polymeric systems.

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AFM and SFG studies of pHEMA-based hydrogel contact lens surfaces in saline solution: adhesion, friction, and the presence of non-crosslinked polymer chains at the surface

Cited by 141 publications

References 45 publications

AFM in mode Peak Force applied to the study of un-worn contact lenses

AFM in mode Peak Force applied to the study of un-worn contact lenses

Hydrogel Contact Lenses Surface Roughness and Bacterial Adhesion

Atomic Force Microscopy–AFM

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