- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Contact Lenses || Contact Lens Materials
摘要： The chapter provides an overview of contact lens materials, focusing on their development, properties, and the ocular response they elicit. It discusses the evolution from glass and PMMA to silicone hydrogels, highlighting the importance of oxygen permeability, wettability, and mechanical properties in lens design. The chapter also explores the challenges in achieving biocompatibility and comfort, the impact of lens materials on ocular health, and the future directions in materials development to address issues like dry eye and the ageing ocular surface.
关键词： Oxygen Permeability,Dry Eye,Ocular Response,Ageing Anterior Eye,Silicone Hydrogels,Contact Lens Materials,Biocompatibility
更新于2025-09-04 15:30:14
-
Photodetachable Adhesion
摘要： Peeling from strong adhesion is hard, and sometimes painful. Herein, an approach is described to achieve both strong adhesion and easy detachment. The latter is triggered, on-demand, through an exposure to light of a certain frequency range. The principle of photodetachable adhesion is first demonstrated using two hydrogels as adherends. Each hydrogel has a covalent polymer network, but does not have functional groups for bonding, so that the two hydrogels by themselves adhere poorly. The two hydrogels, however, adhere strongly when an aqueous solution of polymer chains is spread on the surfaces of the hydrogels and is triggered to form a stitching polymer network in situ, in topological entanglement with the pre-existing polymer networks of the two hydrogels. The two hydrogels detach easily when the stitching polymer network is so functionalized that it undergoes a gel–sol transition in response to a UV light. For example, two pieces of alginate–polyacrylamide hydrogels achieve adhesion energies about 1400 and 10 J m?2, respectively, before and after the UV radiation. Experiments are conducted to study the physics and chemistry of this strong and photodetachable adhesion, and to adhere and detach various materials, including hydrogels, elastomers, and inorganic solids.
关键词： hydrogels,light-triggered,photodetachable adhesion,topological
更新于2025-09-04 15:30:14