Heterogeneity of hard skin layer in wrinkled PDMS surface fabricated by Ar ion-beam irradiation.

ABSTRACT: The spatial distribution of binding states in the depth direction of a soft polydimethylsiloxane (PDMS) material was investigated in the hard skin layer formed by Ar ion-beam irradiation. The hard skin layer, typically considered silica-like and homogeneous, was heterogeneous, comprising a topmost layer and an intermediate layer. Impinging Ar ions transferred energy to the PDMS medium by collisional energy transfer, which was maximised at the surface and decreased gradually as the ions penetrated the PDMS. The decreasing energy transfer rate from the surface created a heterogeneous hard skin layer. X-ray photoelectron spectroscopic depth profiling showed the existence of the topmost and intermediate layers. In the topmost layer, scission and cross-linking occurred simultaneously; Si-O bond

SUBMITTER: Lee S 

PROVIDER: S-EPMC6145931 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature