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Issue 2, 2016

Delayed luminescence induced by complex domains in water and in TEOS aqueous solutions

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Abstract

Many recent studies on water have conjectured a complex structure composed of hydrogen bonded low- and high-density domains. In this work the structure of pure water and aqueous solutions of silica gel (TEOS) has been investigated by using delayed luminescence, which has previously shown a significant increase in aqueous salt solutions where low-density domain formation is expected. Photon emission shows an Arrhenius trend with an activation energy in water–TEOS solutions larger than in pure water and salt-water solutions. Moreover, delayed photon emission decay shows an intrinsic lifetime of about 5 μs both in solutions and in pure water that, along with secondary lifetimes induced by the presence of TEOS, could be related to the formation of different domains.

Graphical abstract: Delayed luminescence induced by complex domains in water and in TEOS aqueous solutions

Article information


Submitted
13 Jun 2015
Accepted
19 Nov 2015
First published
19 Nov 2015

Phys. Chem. Chem. Phys., 2016,18, 772-780
Article type
Paper
Author version available

Delayed luminescence induced by complex domains in water and in TEOS aqueous solutions

C. Colleoni, S. Esposito, R. Grasso, M. Gulino, F. Musumeci, D. Romeli, G. Rosace, G. Salesi and A. Scordino, Phys. Chem. Chem. Phys., 2016, 18, 772 DOI: 10.1039/C5CP03420E

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