How To Reach C&ENACS Membership Number
Shell


 

May 20, 2002
Volume 80, Number 20
CENEAR 80 20 p. 6
ISSN 0009-2347


SCIENCE

With Wave Control, The Patterns Are Limitless

The well-studied Belousov-Zhabotinsky (BZ) reaction is a complicated process in which an ion's oxidation state oscillates, changing colors as it goes. The reaction produces striking, evolving wave patterns and is often used to study wave behavior.

Now, West Virginia University chemistry professor Kenneth Showalter, postdocs Tatsunari Sakurai and Eugene Mihaliuk, and graduate student Florin Chirila show they can control the waves in a BZ reaction, creating any pattern they wish (Science, published online May 2, http://sciencemag.org/cgi/content/abstract/1071265v1).

The group members have developed a feedback system to steer the direction of the waves by using light to change what's called the local excitability--the ability of the system to respond to perturbations--around the wave. They can design trajectories such as the hypotrochoid paths shown left, top and bottom, in multiple exposures taken every 40 seconds. For comparison, theoretical calculations are shown on the right.

But what is such control good for? "That is always the $64,000 question," Showalter tells C&EN. "I think we have learned a great deal about how waves interact with a dynamically varying medium." Biology is rife with such wave phenomena, for one example, and controlling the processes will go a long way toward helping scientists understand them.

8020showalter 8020showalter
8020showalter 8020showalter
© SCIENCE



Top


Chemical & Engineering News
Copyright © 2002 American Chemical Society



 
Related Story
Related Person
E-mail this article to a friend
Print this article
E-mail the editor
   
 

Home | Table of Contents | Today's Headlines | Business | Government & Policy | Science & Technology | C&EN Classifieds
About C&EN | How To Reach Us | How to Advertise | Editorial Calendar | Email Webmaster

Chemical & Engineering News
Copyright © 2002 American Chemical Society. All rights reserved.
• (202) 872-4600 • (800) 227-5558

CASChemPortChemCenterPubs Page