Events Calendar View

• Departmental Colloquium Mar 13, 2012

  Novel Properties and Applications of Functionalized Fullerenes

  

  Guest: Vijay Krishna, Particle Engineering Research Center, University of Florida
  Tuesday, March 13, 2012 4:00 pm - 5:00 pm
  Location: 202

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  We have discovered that certain functionalized fullerenes can be heated and ignited with low-intensity, continuous-wave laser irradiation. The laser induced ignition is observed with near-infrared, green and blue lasers. In absence of oxygen, functionalized fullerenes glow and transform into other carbon nanostructures, such as single-walled carbon nanotubes, multi-walled carbon nanotubes and carbon onions.
  
  These novel optical properties of functionalized fullerenes have game-changing applications in energy, medical, electronics and advanced materials industries. In the energy sector, pyrotechnic charge was ignited with functionalized fullerenes and low-intensity laser (kW/cm2 vs. conventional GW/cm2). In the medical sector, we have demonstrated photoacoustic imaging and photothermal ablation of tumor in mice. For the electronics sector, we have developed methods for green and safe nanolithography. In the advanced materials sector, we have demonstrated ultra-rapid and catalyst-free optical transformation of functionalized fullerenes into carbon nanostructures.  This is the first catalyst-free process to create SWNTs and MWNTs under ambient conditions, and has the potential to produce next generation, high-performance nanocomposite coatings and thin films through in situ synthesis of carbon nanotubes. Water-soluble functionalized fullerenes have minimal eco-toxicity and have potential as a growth stimulant.

• CSP Lunch Seminar Mar 20, 2012

  Modified Late-time Domain Growth Behavior Due to Compressibility

  

  Guest: Meng Meng
  Tuesday, March 20, 2012 12:30 pm - 1:30 pm
  Location: CSP Conference Room (322)

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• Departmental Colloquium Mar 22, 2012

  Some secrets of swimming in sand

  

  Guest: Prof. Daniel I. Goldman, Georgia Institute of Technology School of Physics
  Thursday, March 22, 2012 4:00 pm - 5:00 pm
  Location: Physics 202

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  I will summarize our recent progress in biophysical experiments and modeling of the locomotion of a sand-swimming lizard, the sandfish. We use high speed x-ray imaging to study how the 10 cm-long sandfish swims at 2 body-lengths/sec within sand, a granular material that displays solid and fluid-like behavior. Below the surface the lizard no longer uses limbs for propulsion but generates thrust to overcome drag by propagating an undulatory traveling wave down the body. To predict sandfish swimming speed in the granular ``frictional fluid", we develop an empirical resistive force model by measuring drag force on a small cylinder oriented at different angles relative to the displacement direction and summing these forces over the animal movement profile. The model correctly predicts the animal's wave efficiency (ratio of forward speed to wave speed) as approximately 0.5. The empirical model agrees with a more detailed numerical simulation: a multi-segment model of the sandfish coupled to a multi-particle simulation of the granular medium. We use the principles discovered to construct a sand-swimming physical model (a robot) which, like in our empirical and simulation models, swims fastest using the preferred sandfish wave pattern.

• Observatory Open House Mar 23, 2012

  Observatory Open House

  

  Friday, March 23, 2012 9:00 pm - 10:30 pm
  Location:

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  The Department of Physics and Astronomy would like to invite the public to join them for a evening to view the night sky at the department observatory. The observatory is located at the top of the Physics building. In case of inclement weather, there will be a talk. See the UGA Observatory Schedule for more information.
• Departmental Colloquium Mar 29, 2012

  Mass generation for Dirac electrons in graphene

  

  Guest: Prof. Markus Kindermann, Georgia Institute of Technology School of Physics
  Thursday, March 29, 2012 4:00 pm - 5:00 pm
  Location: Physics 202

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  Graphene, a two-dimensional allotrope of carbon, has drawn much attention since its first experimental isolation. Much of this fascination stems from its exotic low-energy dynamics that is governed by the ``Dirac equation,’’ a quantum mechanical law of motion that was originally discovered for relativistic particles such as neutrinos. Unlike for real neutrinos, however, the Dirac equation for electrons in graphene is generically massless. In this talk I discuss how a mass term can be induced in the material and what the consequences of such mass are. Also unlike the situation for real, relativistic particles, the mass for the charge carriers in graphene can be space-dependent. I will discuss the manifestations of this exotic property for the electrical characteristics of the material. I will discuss evidence of the discussed effects in scanning tunneling microscopy measurements.

   

• CSP Lunch Seminar Apr 10, 2012

  A study of magnetic nanoparticles via Computer Simulation

  

  Guest: Julio Rocha
  Tuesday, April 10, 2012 12:30 pm - 1:30 pm
  Location: CSP Conference Room (322)

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