Imagine Magazine - Johns Hopkins - March/April 2014 - (Page 18)

and A Tale of Determination and Discovery Nanocrystals by Janelle Tam Cellulose: you might know it as the organic compound that gives trees their rigidity. After its discovery in 1838, it didn't take scientists long to find many uses for this organic polymer. By the early 20th century, cellulose was being used to make celluloid, rayon, and cellophane. In the last few decades, scientists have discovered that cellulose also has interesting characteristics at the nanoscale. When the cellulose in wood pulp is dissolved with concentrated sulfuric acid, tiny rod-shaped crystals about 1/3000 the width of a strand of human hair are left behind. Called nanocrystalline cellulose (NCC), this plantderived material has remarkable properties. Not only is it structurally stronger than steel at the same dimensions, but it also possesses many fascinating chemical, magnetic, and electrical properties. Most important, it is easily functionalized, meaning that it can be given different characteristics by attaching molecules to its surface. These properties, coupled 18 imagine with its status as a natural, abundant, renewable resource, make it an extremely attractive material for a wide range of applications from food additives to antimicrobial films to lightweight body armor. I was introduced to NCC in high school, when I began working in a university lab where researchers were beginning to explore the characteristics of this exciting new material. Mar/Apr 2014

Table of Contents for the Digital Edition of Imagine Magazine - Johns Hopkins - March/April 2014

In My Own Words
Chemistry Is…
Master of Reactions
Fascinated by Photochemistry
What About Labs?
Buckyballs and Nanocrystals
Small Is Big
Chemistry Among the Stars
Making Chemicals Safer, 21st Century Style
Selected Opportunities & Resources
Empowered to Change the World
The Buzz About History
Off the Shelf
Word Wise
Exploring Career Options
One Step Ahead
Planning Ahead for College
Students Review
Mark Your Calendar
Knossos Games

Imagine Magazine - Johns Hopkins - March/April 2014