UC Riverside Researcher Using Snail Teeth to Improve Solar Cells and Batteries

An assistant professor at the University of California, Riverside’s Bourns College of Engineering is using the teeth of a marine snail found off the coast of California to create less costly and more efficient nanoscale materials to improve solar cells and lithium-ion batteries.

The most recent findings by David Kisailus, an assistant professor of chemical and environmental engineering, details how the teeth of chiton grow. The paper was published today (Jan. 16) in the journal Advanced Functional Materials. It was co-authored by several of his current and former students and scientists at Harvard University in Cambridge Mass., Chapman University in Orange, Calif. and Brookhaven National Laboratory in Upton, NY.

The paper is focused on the gumboot chiton, the largest type of chiton, which can be up to a foot-long. They are found along the shores of the Pacific Ocean from central California to Alaska. They have a leathery upper skin, which is usually reddish-brown and occasionally orange, leading some to give it the nickname “wandering meatloaf.”

Over time, chitons have evolved to eat algae growing on and within rocks using a specialized rasping organ called a radula, a conveyer belt-like structure in the mouth that contains 70 to 80 parallel rows of teeth. During the feeding process, the first few rows of the teeth are used to grind rock to get to the algae. They become worn, but new teeth are continuously produced and enter the “wear zone” at the same rate as teeth are shed.

Kisailus, who uses nature as inspiration to design next generation engineering products and materials, started studying chitons five years ago because he was interested in abrasion and impact-resistant materials. He has previously determined that the chiton teeth contain the hardest biomineral known on Earth, magnetite, which is the key mineral that not only makes the tooth hard, but also magnetic.

In the just-published paper, “Phase transformations and structural developments in the radular teeth of Cryptochiton stelleri,” Kisailus set out to determine how the hard and magnetic outer region of the tooth forms.

His work revealed this occurs in three steps. Initially, hydrated iron oxide (ferrihydrite) crystals nucleate on a fiber-like chitinous (complex sugar) organic template. These nanocrystalline ferrihydrite particles convert to a magnetic iron oxide (magnetite) through a solid-state transformation. Finally, the magnetite particles grow along these organic fibers, yielding parallel rods within the mature teeth that make them so hard and tough.

“Incredibly, all of this occurs at room temperature and under environmentally benign conditions,” Kisailus said. “This makes it appealing to utilize similar strategies to make nanomaterials in a cost-effective manner.”
A series of images that show the teeth of the chiton

Kisailus is using the lessons learned from this biomineralization pathway as inspiration in his lab to guide the growth of minerals used in solar cells and lithium-ion batteries. By controlling the crystal size, shape and orientation of engineering nanomaterials, he believes he can build materials that will allow the solar cells and lithium-ion batteries to operate more efficiently. In other words, the solar cells will be able to capture a greater percentage of sunlight and convert it to electricity more efficiently and the lithium-ion batteries could need significantly less time to recharge.

Using the chiton teeth model has another advantage: engineering nanocrystals can be grown at significantly lower temperatures, which means significantly lower production costs.

While Kisailus is focused on solar cells and lithium-ion batteries, the same techniques could be used to develop everything from materials for car and airplane frames to abrasion resistant clothing. In addition, understanding the formation and properties of the chiton teeth could help to create better design parameters for better oil drills and dental drill bits.

Co-authors of the Advanced Functional Materials paper were: Qianqian Wang, Michiko Nemoto, Dongsheng Li, Garrett W. Milliron, Brian Weden, Leslie R. Wood, all of whom are current or former undergraduate and graduate students at UC Riverside; James C. Weaver, a former post-doc of Kisailus, now at Harvard University; John Stegemeier and Christopher S. Kim, of Chapman University; and Elaine DiMasi, of Brookhaven National Laboratory.

Media Contact

Sean Nealon
Tel: (951) 827-1287
E-mail: sean.nealon@ucr.edu
Twitter: seannealon
Additional Contacts
David Kisailus
Tel: 951-827-2260
E-mail: david@engr.ucr.edu

Media Contact

Sean Nealon EurekAlert!

All latest news from the category: Materials Sciences

Materials management deals with the research, development, manufacturing and processing of raw and industrial materials. Key aspects here are biological and medical issues, which play an increasingly important role in this field.

innovations-report offers in-depth articles related to the development and application of materials and the structure and properties of new materials.

Back to home

Comments (0)

Write a comment

Newest articles

When the music changes, so does the dance

Controlling cooperative electronic states in Kagome metals. Playing a different sound track is, physically speaking, only a minute change of the vibration spectrum, yet its impact on a dance floor…

EcoFABs could lead to better bioenergy crops

Fabricated ecosystems created at Berkeley Lab will expedite microbiome research, and help underrepresented students in the classroom. A greater understanding of how plants and microbes work together to store vast…

Rice lab finds better way to handle hard-to-recycle material

Process transforms glass fiber-reinforced plastic into silicon carbide. Glass fiber-reinforced plastic (GFRP), a strong and durable composite material, is widely used in everything from aircraft parts to windmill blades. Yet…

Partners & Sponsors