Oxidative stress is a critical process in biological systems, involved in both normal and pathological functions; thus it is a commonly measured endpoint. Current methods for measuring oxidative stress are affected by artifacts, such as auto-oxidation. We are developing a new measurement

Rare-earth doped nanoparticles (NPs) are known to have exceptional optical properties such as strong absorption and sharp emission lines. Since the optical properties are due to the f-f electron transitions, these nanoparticles do not photobleach like organic dyes or blink like quantum do

CVD Graphene was synthesized at PENN. A Field Effect Transistor was fabricated at UPRH . No lithography was used (i.e. no harsh chemicals used) to define the source and drain electrodes, instead a TEM grid was used as a shadow mask. This is new to graphene based device fabrication. The d

Surfactant molecules of Tau-3PDP and Phs-3PDP self-assemble into fractal patterns when placed on an air-water interface. These fractal crystals can subsequently be coated with various metallic films and used in electronic devices. Several labs are currently trying to unlock the potential

Abrasive wear induced by the slow flow of concentrated slurry is encountered in many industrial problems. In this work, using a combination of experiment and theory, the coupled issues of the rheology of a concentrated solids-laden liquid and the boundary wear generated as it flows in conf

The self-assembly dynamics of our two-dimensionally confined organic films defines the composite nanostructure. Mimicking biology, highly organized templates lead to polycrystallinity, and sparse films lead to large single crystals, but films on the phase envelope lead to complex composi

The structure transitions from staggered to loose double chain configuration as the voltage is ramped down at constant magnetic field. As the voltage is ramped back up the structure reforms and the staggered character begins to re-emerge.

Numerical simulations of the deformation of a droplet in viscous fluid under shear flow are performed with the Lattice Boltzmann method (LBM) based on the Cahn-Hilliard diffuse interface approach. The Degree of confinement between two parallel walls, which is defined as the ration betwee

Molecular dynamics simulations are used to study the dynamics of drop splashing on a solid surface. In agreement with experiment, we observe that splashes occur only in the presence of vapor. We are investigating how the flow in the vapor produces the stress which tears the drop into fr

We have developed new state of the art density matrix renormalization group (DMRG) and transport codes, which can deal with large electron systems with interaction. Right two figures represent some results we obtained with our collaborators. On the right side, top panel shows our quantum