The high- Q static scattering of 3-methyl pyridine/D 2 O mixtures without and with antagonistic salt

Abstract

Here we focus on the high- Q small-angle neutron scattering where we observed deviations from an ideal power law Q −2 . From theory, this deviation Δ arises from the critical correlation-function exponent η d in d dimensions. The investigated systems were 3-methyl pyridine/D 2 O without and with antagonistitc salt. They display the critical behavior of a 3d and 2d Ising system, respectively. In the first case, the value of Δ matches the ideal value η 3 well, but in the latter case the value of Δ is affected by the two confined dimensions and the third dimension.