Controllable transformation from sensitive and reversible heat-set organogel to stable gel induced by sodium acetate

This paper describes the first example of controllable transformation from sensitive and reversible heat-set organogel to stable gel induced by sodium acetate. Upon the addition of proper amount of acetate sodium into the reversible heat-set organogel system composed of beta-CD, phenolphthalein (PP) and lithium chloride in N,N-dimethylformamide, the reversible gel could transform to stable gel as the temperature decreased. Further studies showed that other analogous acetates with K+ and Mg2+ do not possess this property. The gel was characterized by SEM, XRD and FT-IR. This work may pave the way for the design of smart materials with multi-responsiveness. (C) 2012 Elsevier B.V. All rights reserved.