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首页> 外文期刊>Biomaterials >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.
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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.

机译：在盐溶液中对基于pHEMA的水凝胶隐形眼镜表面进行AFM和SFG研究：附着力，摩擦力以及表面上未交联的聚合物链的存在。

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摘要

The surfaces of two types of soft contact lenses neutral and ionic hydrogels--were characterized by atomic force microscopy (AFM) and sum-frequency-generation (SFG) vibrational spectroscopy. AFM measurements in saline solution showed that the presence of ionic functional groups at the surface lowered the friction and adhesion to a hydrophobic polystyrene tip. This was attributed to the specific interactions of water and the molecular orientation of hydrogel chains at the surface. Friction and adhesion behavior also revealed the presence of domains of non-crosslinked polymer chains at the lens surface. SFG showed that the lens surface became partially dehydrated upon exposure to air. On this partially dehydrated lens surface, the non-crosslinked domains exhibited low friction and adhesion in AFM. Fully hydrated in saline solution, the non-crosslinked domains extended more than tens of nanometers into solution and were mobile.
机译：两种类型的软性隐形眼镜的中性和离子水凝胶的表面都有原子力显微镜（AFM）和和频产生（SFG）振动光谱学的表征。在盐水溶液中的原子力显微镜测量表明，表面上离子官能团的存在降低了与疏水性聚苯乙烯尖端的摩擦力和粘附力。这归因于水的特殊相互作用和表面水凝胶链的分子取向。摩擦和粘附行为也表明在镜片表面存在非交联的聚合物链的域。 SFG显示，镜片表面在暴露于空气后变得部分脱水。在该部分脱水的镜片表面上，非交联区域在AFM中表现出低摩擦和附着力。在盐溶液中完全水合，非交联结构域向溶液中延伸了数十纳米，并且可以移动。

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