An organic-based pH oscillator
An organic-based pH oscillator
In a recent paper, we suggested that the acid- or base-catalyzed dehydration of a hydrated carbonyl compound provides a suitable foundation for an organic-based pH oscillator. Here we present the first experimental example of such an oscillator in a flow reactor, utilizing the base-catalyzed dehydration of methylene glycol as a source of positive feedback (OH- autocatalysis) coupled with the base-catalyzed hydrolysis of gluconolactone for negative feedback (H+ production). The large amplitude oscillations (between pH 7 and 10) are reproduced in a kinetic model of the reaction. Such experiments present new possibilities in the design of pH oscillators.
Kovacs, K.
b6ee9b2a-87b9-458d-b42b-9da62c637bf7
McIlwaine, R.E.
d6ab6441-ab31-4d20-be4d-bbf0a93b9f8d
Scott, S.K.
a770eaaa-b799-49d1-88dd-18e20def15f4
Taylor, A.F.
08028a29-428d-4732-b6b1-f7a93389b386
9 January 2007
Kovacs, K.
b6ee9b2a-87b9-458d-b42b-9da62c637bf7
McIlwaine, R.E.
d6ab6441-ab31-4d20-be4d-bbf0a93b9f8d
Scott, S.K.
a770eaaa-b799-49d1-88dd-18e20def15f4
Taylor, A.F.
08028a29-428d-4732-b6b1-f7a93389b386
Kovacs, K., McIlwaine, R.E., Scott, S.K. and Taylor, A.F.
(2007)
An organic-based pH oscillator.
Journal of Physical Chemistry A, 111 (4).
(doi:10.1021/jp068534v).
Abstract
In a recent paper, we suggested that the acid- or base-catalyzed dehydration of a hydrated carbonyl compound provides a suitable foundation for an organic-based pH oscillator. Here we present the first experimental example of such an oscillator in a flow reactor, utilizing the base-catalyzed dehydration of methylene glycol as a source of positive feedback (OH- autocatalysis) coupled with the base-catalyzed hydrolysis of gluconolactone for negative feedback (H+ production). The large amplitude oscillations (between pH 7 and 10) are reproduced in a kinetic model of the reaction. Such experiments present new possibilities in the design of pH oscillators.
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Published date: 9 January 2007
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Local EPrints ID: 499623
URI: http://eprints.soton.ac.uk/id/eprint/499623
ISSN: 1089-5639
PURE UUID: 7758f867-b925-44ad-ac37-2b4b9f26ad44
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Date deposited: 27 Mar 2025 18:22
Last modified: 28 Mar 2025 03:15
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Author:
K. Kovacs
Author:
R.E. McIlwaine
Author:
S.K. Scott
Author:
A.F. Taylor
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