Independent characterization of the elastic and the mixing parts of hydrogel osmotic pressure

Fabrication of Fully Positively Charged Layer-by-Layer Polyelectrolyte Nanofilms with pH-Dependent Swelling Properties

“…Nanofilms with a high graft ratio of functional groups showed an opposite trend possibly because the amount of free amino groups was the smallest; therefore, the nanofilms were not sensitive. Additionally, for nanofilms with a higher graft ratio, after the deprotonation of amine groups, the osmotic pressure caused by the polymer–water interaction draws more solutions into the nanofilms, leading to swelling instead. , It is noteworthy that the swelling and shrinking of the nanofilms could be repeated, indicating the stability of FPC LbL nanofilms compared to polyelectrolyte (PE) LbL nanofilms. As shown in Figure S10, after incubation of (PLL-EG 4 -Azi 21 /PLL-EG 2 -Alk 15 ) 5 and (PLL/PAA) 5 PE LbL nanofilms at pH 2 and 12, the PE nanofilms dissociated rapidly under both pH conditions.…”

Deformation-dependent gel surface topography due to the elastocapillary and osmocapillary effects

“…36–39 Such contradictions are expected because the Flory–Rehner model has been shown to severely underestimate the volumetric elasticity of the polymer network. 40 In the lack of an accurate compressible constitutive model for polymer networks, here we use the classical compressible neo-Hookean model to qualitatively illustrate the effect of network compressibility. 41 We tune the Poisson's ratio between ν = 0 to 0.5 and repeat the simulations for the elastocapillary and osmocapillary cases.…”