Rheological behaviour of aqueous mullite-albumin-methylcellulose suspensions

M. L. SANDOVAL; M.A. CAMERUCCI

CERAMICS INTERNATIONAL

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2017 p. 7243 - 7252

0272-8842

In this work, the thermogelling behavior of aqueous mullitebovineserum albumin (BSA) suspensions was studied by dynamic rheology inorder to determine the experimental conditions that must be used to formmullite green bodies by thermal consolidation. Viscoelastic properties(G´ and G´´) as a function of temperature (30-95°C) and time weredetermined by temperature sweep tests and time sweep tests, respectively.On the other hand, the influence of methylcellulose (MC) (2 wt%) as abinder on the viscoelastic properties of the aqueous mullite-proteinsystem as a function of both experimental parameters (temperature andtime) was also studied. In addition, shear flow properties of aqueousmullite (40 vol%; 0.45 wt% of polyacrylic polyelectrolyte as adispersant)-BSA (10 and 15 vol%)-MC (2 wt%) suspensions were analyzed toobtain information on the rheological behavior of the suspensions at roomtemperature. The results obtained showed that the presence of mulliteparticles and MC changed the onset temperature of gelation of the proteinand increased the gelation time. Thus, both the mullite particles andmethylcellulose intervened in the formation of the developed protein gel