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Mixture of colloidal particles (blue) and nanoparticles (red): photonic materials.

Multiscale Modeling of Colloid-Nanoparticle Mixtures Alan R. Denton, North Dakota State University, DMR1106331.

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Mixture of colloidal particles (blue) and nanoparticles (red): photonic materials.

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  1. Multiscale Modeling of Colloid-Nanoparticle MixturesAlan R. Denton, North Dakota State University, DMR1106331 Colloidal mixtures have attracted recent attention for their remarkably rich phase behavior. The potential to independently vary macroion size and charge ratios greatly expands possibilities for tuning interparticle interactions and materials properties. In modeling such complex materials, multiscale methods prove essential to surmount computational challenges posed by broad length and time scales. Using response theory and computer simulation, we have developed a hierarchical approach to modeling effective interactions and phase stability in mixtures of colloids and nanoparticles, which are characterized by extreme size and charge asymmetries. We find that charged nanoparticles contribute to the screening of electrostatic interactions between charged colloids. This work has broad significance for the design of novel materials with applications to photonics. Mixture of colloidal particles (blue) and nanoparticles (red): photonic materials.

  2. Science Outreach: Taking It to the SchoolsAlan R. Denton, North Dakota State University, DMR1106331 On the heels of the Nobel Prize announcements, we staged our second annual "Science Fun Night" at Longfellow Elementary School in Fargo.  With kind support from the school staff and PTA, and help from a dedicated team of NDSU faculty and student volunteers, the event drew about 100 enthusiastic students (plus parents).  Students rotated through a variety of stations, each including hands-on activities. Several were based on common materials, such as “Soapy Science,”“Polymer Play,” "Charged Up,” and ”Magic Magnets.” Very popular demonstrations included cryogenics (liquid nitrogen), superconductors, electrostatics, and giant bubbles. Drawing sparks and crowds at an annual outreach event, “Science Fun Night” at Longfellow Elementary School in Fargo. About 100 kids and parents rotate through stations with several hands-on activities.

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