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Issue 26, 2018
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Glass formation of a DMSO–water mixture probed with a photosynthetic pigment

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Abstract

Despite their extensive industrial usage, glass-forming liquids are not fully understood, and methods to investigate their dynamical heterogeneity are sought after. Here we show how the appearance of a second component in the visible absorption spectrum of a photosynthetic pigment upon cooling can be used to probe the glass transition of a dimethylsulfoxide–water mixture. The changes in the relative ratio of the two components with respect to temperature follow a sigmoid curve, and we show that the second component arises due to protonation of the pigment at low temperatures. Furthermore, from visible transient absorption spectra we show that, unlike the first component, the dynamics of the second component slows down significantly at lower temperatures, suggesting that there are two distinct environments with fast and slow fluctuations. Our results therefore enable a new method to characterize the dynamical heterogeneity of glass-forming liquids.

Graphical abstract: Glass formation of a DMSO–water mixture probed with a photosynthetic pigment

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Supplementary files

Article information


Submitted
08 May 2018
Accepted
06 Jun 2018
First published
06 Jun 2018

Phys. Chem. Chem. Phys., 2018,20, 17552-17556
Article type
Communication

Glass formation of a DMSO–water mixture probed with a photosynthetic pigment

A. Huerta-Viga, L. Nguyen, S. Amirjalayer, J. H. N. Sim, Z. Zhang and H. Tan, Phys. Chem. Chem. Phys., 2018, 20, 17552
DOI: 10.1039/C8CP03058H

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