Author ORCID Identifier

https://orcid.org/0009-0004-0765-0273

Semester

Summer

Date of Graduation

2024

Document Type

Dissertation

Degree Type

PhD

College

Eberly College of Arts and Sciences

Department

Chemistry

Committee Chair

Kenneth Showalter

Committee Co-Chair

Mark Tinsley

Committee Member

Fabien Goulay

Committee Member

Mikel Holcomb

Committee Member

Justin Legleiter

Committee Member

Terry Gullion

Abstract

This dissertation explores the intricate dynamics of pattern formation in nonlinear chemical systems, specifically focusing on the phenomena of propagating waves and Liesegang patterns in aluminum and zinc hydroxide systems. Through a combination of experimental setups and theoretical models, the study delves into the mechanisms driving these patterns, providing insights into their formation, evolution, and underlying principles.

The research begins with an introduction to nonlinear dynamics and pattern formation, emphasizing the significance of these concepts in understanding complex natural systems. It then moves into a detailed examination of Liesegang bands, discussing classical and reverse systems, and introducing the redissolution process where excess outer electrolyte interacts with the initial precipitate, leading to unique pattern dynamics.

One of the pivotal discoveries presented is the wave merging phenomenon observed in the AlCl3-NaOH system. This behavior, where successive waves can merge due to anomalous dispersion relationships, mirrors patterns seen in other chemical and biological systems. The study reveals that while initial waves in this system merge, subsequent waves do not, highlighting the complex interplay between wave propagation and chemical concentration fields.

The dissertation extends the study to the Zn(NO3)2-NaOH system, comparing its wave formation and dynamics with the AlCl3-NaOH system. The findings suggest that while the systems share similarities, the zinc system exhibits unique behaviors, such as circular wave propagation and wave merging characteristics.

Overall, this research enhances the understanding of non-equilibrium chemical dynamics and offers potential applications in designing responsive materials and understanding natural pattern formation in geological and biological contexts.

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