The rheology of liquid elemental sulfur across the λ-transition

Modifying effects of hydrogen sulfide on the rheometric properties of liquid elemental sulfur

“…The purity of the sample was calculated by difference from the original sample weight. Mature Carsul (carbon sulfur solid polymer) and inorganic material is insoluble in CS 2 thus allowing the elemental sulfur to be isolated for the purity measurement 5 . Inorganic ash was determined by melting and igniting 100 g dry sulfur samples in a crucible on a hotplate with the aid of a torch.…”

“…The experimental rheometer setup consists of an Anton‐Paar MCR 302 rheometer with a custom built gravity‐fed reservoir, high‐pressure N 2 /H 2 S cylinders and a thermostated Fourier Transform Infrared (FT‐IR) cell used from previous studies 5,11,12 . A head pressure tee for inducing H 2 S partial pressures along with a purging system consisting of KOH traps for scrubbing the H 2 S prior to venting was added.…”

“…The yellow shaded region displays the pressure tee. Adapted from Sofekun et al 5 [Color figure can be viewed at wileyonlinelibrary.com]…”

“…Temperature in the pressure cell jacket is controlled using a resistive element. The contacts for this resistive heater were previously modified by hard‐wiring to the manufacturer control, as the original contacts were susceptible to sulfidation 5 …”

“…In order to address these needs, shear rate and its associated viscosity was investigated and correlated to sulfur's Newtonian and apparent non‐Newtonian fluid properties under different conditions 5 . More recently, the viscoelastic properties confirmed that the homolytic bond scission and recombination were on the same timescale as reptative motion, 4 thus chemically disrupting the concatenation can modify the viscosity profile.…”