Blinking Semiconducting Nanorods

Several clusters of semiconducting nanorods are being illuminated by blue light. The nanorods absorb blue light, become excited and emit red light. The emission of light by individual nanorods occurs in a random fashion with the nanorod turning "on" and "off" for variable lengths of time.

 

Microfluidics

 

Microfluidic channel in place for video microscopy.

Right: Schematic of microchannel, and example velocity profiles superposed on an actual image of the colloidal NIPA suspension.

From the labs of Profs. Doug Durian and Jerry Golub

 

The SNO+ Experiment

SNO-plus is a multi-purpose neutrino experiment, located 2km underground in an active nickel mine in Sudbury, Ontario. It is a large liquid scintillator experiment, currently under construction, inheriting most of the detector hardware from the successful SNO experiment.  The Penn SNO-plus group is led by Professor Josh Klein.

 

Nanotech Gene Sequencing

Prof. Marija Drndic is researching a technique to sequence genes by reading DNA bases as they translocate through a silicon nitride nanopore.  As strands of DNA in a salt solution are driven through the pore by an applied electric field, the electric current passing through changes with the size of the base.  This method could be essential for swift sequencing of genes and personalized medicine.

Dark Excitons

Excitons are electrically neutral excited states of a material consisting of a bound state of an electron and a hole.  Prof. Jay Kikkawa explores previously unseen "dark exciton" states in carbon nanotubes and shows their dependence on geometry of the nanotube.