The Art of Quantum Dots and Flat Material

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Scope Correspondent

Think of chemistry and you probably imagine a lab filled with beakers and flasks, bubbling with colorful liquids in a variety of hues.  There’s an element of this in Will Tisdale’s chemical engineering lab, which overlooks a courtyard on the MIT campus dominated by a huge red modernist sculpture.  Here, his team mixes together chemicals and boils them in oxygen-free environments to make a substance called quantum dots.

But in the Tisdale lab, these dots are often just a means to an end.  On a dreary December afternoon, two lab members, Ferry Prins and Aaron Goodman, shined lasers on colorful quantum dots to explore how they share energy and electrons with a two-dimensional chemical called molybdenum disulfide. Full Article »

To Build an Instrument

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To enable every new scientific discovery, someone must first construct the necessary tools. A physician must have his CT scanner, a bench scientist her microscope. Every experiment rests on a foundation of others’ ingenuity.

And yet, we rarely stop to think about those who build these instruments, the mechanical engineers who sketch, model, weld, and saw to create a precise and reliable tool out of raw materials (and a bit of elbow grease).

It was at the MIT’s Sports Innovation Lab that I first began to appreciate this role. I came to the lab expecting to see science at the cutting edge, experiments that pushed the envelope. Yet what I observed was a process that is the necessary and unglamorous predecessor to new discovery.

Rastislav Racz, aka Rasto, a mechanical engineering student, was working to build a bicycle rig, a platform on which high performance bikes would be placed to undergo testing in MIT’s Wright Brothers Wind Tunnel. On paper, the goal was straightforward: to build a rig that would hold the bicycle steady and measure the forces of the wind on the bicycle’s rider and frame. The final product would be a rather unexciting collection of aluminum and steel that would nevertheless be vitally important for future experiments in the lab.

The first step was to tackle the design, which Rasto had already been wrestling with for over four months. Pencil sketches and physics equations filled notebook upon notebook. Much of his time was spent repeating a laborious and solitary cycle: brainstorm, scribble, calculate, and repeat. Full Article »