Fine control and selection of travelling waves in Inorganic Pattern Forming Reactions

de Lacy Costello, Ben; Jahan, Ishrat; Ratcliffe, Norman M.; Armstrong, James

Abstract

Under normal reaction conditions [AlCl3 0.28-0.34M and NaOH 2.5M A.Volford et al.] spontaneous spiral and circular travelling precipitate waves were observed. We constructed a phase diagram for the reaction and identified a large controllable region at lower aluminum chloride levels. We show that it is possible to selectively initiate travelling circular waves and other self-organized structures within this controllable region. In previous work initiation was undertaken before adding the outer electrolyte resulting in disorganized waves. However, marking the gel one minute after adding outer electrolyte resulted in cardioid waves. Increasing the time interval to two minutes caused a transition to single circular waves. If the gel is marked sequentially nested circular waves (target waves) are formed. These reactions were used to calculate simple and additively weighted Voronoi tessellations. The fine control of self-organization in precipitation reactions is of interest for the synthesis of novel and functional materials.

• Journal Article Type: Article
• Publication Date: Jan 1, 2009
• Journal: International Journal of Nanotechnology and Molecular Computation
• Print ISSN: 1941-6318
• Publisher: IGI Global
• Peer Reviewed: Peer Reviewed
• Volume: 1
• Issue: 3
• Pages: 26-36
• DOI: https://doi.org/10.4018/jnmc.2009070103
• Keywords: chemical computing, control of self-organised waves, pattern formation, travelling chemical waves
• Public URL: https://uwe-repository.worktribe.com/output/1006645
• Publisher URL: http://dx.doi.org/10.4018/jnmc.2009070103
• Related Public URLs: http://www.igi-global.com/bookstore/Article.aspx?TitleId=4083