Accession Number : ADA320542

Title :   Theory and Experiments on Chemical Instabilities.

Descriptive Note : Final technical rept. Mar 94-Dec 96,

Corporate Author : STANFORD UNIV CA DEPT OF CHEMISTRY

Personal Author(s) : Ross, John

PDF Url : ADA320542

Report Date : 15 JAN 1997

Pagination or Media Count : 12

Abstract : Research accomplishments during the period March, 1994 to December 1996. We have made extensive progress in the theory and experiments on nonlinear kinetics; on studies of complex reaction mechanisms, including systematic approaches to their determination from measurements; and have written a review on propagating and stationary patterns in reaction-transport systems. (A)Theory and Experiments on Nonlinear Kinetics (1) Experimental stabilization of unstable steady states in oscillatory and excitable systems A feedback method is used to stabilize unstable stationary states in experiments with the chlorite-iodide reaction. The unstable stationary states occur in oscillatory and excitable regions of constraint space. Stabilization of unstable steady states provides information about these states and may be of practical importance. An analytical study of a model mechanism of this reaction is consistent with the experiments. This feedback method does not create new stationary states but stabilizes unstable stationary states present in the autonomous system. Unlike 'thermostat' type methods, knowledge of the exact location of the unstable stationary states of the autonomous system is not required to implement this feedback method. Published in the J. Phys. Chem. (308).

Descriptors :   *CHEMICAL PROPERTIES, *NONLINEAR SYSTEMS, *STATIONARY, *INSTABILITY, TEST AND EVALUATION, STABILIZATION, STEADY STATE, PROPAGATION, STABILITY, MODELS, EXCITATION, FEEDBACK, PATTERNS, KINETICS, OSCILLATION, THERMOSTATS.

Subject Categories : Physical Chemistry
      Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE