DOI:10.5488/CMP.22.43607 arXiv:1912.01949
Title:
Gel and glass transition in fragile colloidal clays
Author(s):
| R. Angelini (ISC-CNR, I-00185 Roma, Italy; Dipartimento di Fisica, Sapienza Università di Roma, I-00185, Italy) , | |
| G. Ruocco (Center for Life Nano Science, IIT@Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161, Roma, Italy; Dipartimento di Fisica, Sapienza Università di Roma, I-00185, Italy) , | |
| B. Ruzicka (ISC-CNR, I-00185 Roma, Italy; Dipartimento di Fisica, Sapienza Università di Roma, I-00185, Italy) |
Dynamic Light Scattering (DLS) measurements were performed on colloidal suspensions of Laponite® at different concentrations in the range Cw = (1.5÷3.0)%. Exploiting analogies with supercooled liquids approaching their glass transitions, an Angell plot for the structural relaxation times was drawn. Finally, the fragility of Laponite® suspensions at different concentrations, in different solvents, at two salt concentrations and with the addition of a polymer was reported and discussed.
Key words:
glass transition, colloids, Laponite®, gels, fragility
PACS:
64.70.Pf, 82.70.Dd
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