Poroelastic indentation of mechanically confined hydrogel layers

doi:10.1039/c6sm01448h

	Poroelastic indentation of mechanically confined hydrogel layers
	Delavoipière, J; Tran, Y; Verneuil, E; Chateauminois, A
刊名	Soft matter
	2016-09-28
卷号	12 期号:38 页码:8049-8058
ISSN号	1744-6848
DOI	10.1039/c6sm01448h
文献子类	Article
英文摘要	We report on the poroelastic indentation response of hydrogel thin films geometrically confined within contacts with rigid spherical probes of radii in the millimeter range. Poly(PEGMA) (poly(ethylene glycol) methyl ether methacrylate), poly(DMA) (dimethylacrylamide) and poly(NIPAM) (N-isopropylacrylamide) gel films with thickness less than 15 μm were grafted onto glass substrates using a thiol-ene click chemistry route. Changes in the indentation depth under constant applied load were monitored over time as a function of the film thickness and the radius of curvature of the probe using an interferometric method. In addition, shear properties of the indented films were measured using a lateral contact method. In the case of poly(PEGMA) films, we show that poroelastic indentation behavior is adequately described within the framework of an approximate contact model derived within the limits of confined contact geometries. This model provides simple scaling laws for the characteristic poroelastic time and the equilibrium indentation depth. Conversely, deviations from this model are evidenced for poly(DMA) and poly(NIPAM) films. From lateral contact experiments, these deviations are found to result from strong changes in the shear properties as a result of glass transition (poly(DMA)) or phase separation (poly(NIPAM)) phenomena induced by the drainage of the confined films squeezed between the rigid substrates.
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.183/handle/2S10ELR8/266632]
专题	中国科学院上海药物研究所
通讯作者	Delavoipière, J; Tran, Y; Verneuil, E; Chateauminois, A
作者单位	Soft Matter Sciences and Engineering Laboratory (SIMM), CNRS UMR 7615, UPMC, ESPCI, F-75005 Paris, France. antoine
推荐引用方式 GB/T 7714	Delavoipière, J,Tran, Y,Verneuil, E,et al. Poroelastic indentation of mechanically confined hydrogel layers[J]. Soft matter,2016,12(38):8049-8058.
APA	Delavoipière, J,Tran, Y,Verneuil, E,&Chateauminois, A.(2016).Poroelastic indentation of mechanically confined hydrogel layers.Soft matter,12(38),8049-8058.
MLA	Delavoipière, J,et al."Poroelastic indentation of mechanically confined hydrogel layers".Soft matter 12.38(2016):8049-8058.