Effect of temperature on aging and time-temperature superposition in nonergodic Laponite suspensions

TL;DR

This study investigates how temperature influences aging in nonergodic Laponite suspensions, demonstrating that rheological behavior can be superimposed across temperatures and ages, enabling predictions of long-term properties from short-term tests.

Contribution

It introduces a time-temperature superposition principle for aging Laponite suspensions, linking temperature and aging time effects through relaxation processes.

Findings

Higher temperatures accelerate aging dynamics.

Strain data superpose into a master curve across temperatures.

Superposition enables long-term behavior prediction from short-term tests.

Abstract

We have studied the effect of temperature on aging dynamics of laponite suspensions by carrying out the rheological oscillatory and creep experiments. We observed that at higher temperatures the mechanism responsible for aging became faster thereby shifting the evolution of elastic modulus to lower ages. Significantly, in the creep experiments, all the aging time and the temperature dependent strain data superposed to form a master curve. Possibility of such superposition suggests that the rheological behavior depends on the temperature and the aging time only through the relaxation processes and both the variables do not affect the distribution but only the average value of relaxation times. In addition, this procedure allows us to predict long time rheological behavior by carrying out short time tests at high temperatures and small ages.