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Nanorod Dispersion Map

Nanorod Assembly in Polymer Matrices Russell J. Composto , University of Pennsylvania, DMR 0907493. Nanorods (NR) impart polymeric coatings with unique optical properties because the absorption of light varies with NR length.

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Nanorod Dispersion Map

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  1. Nanorod Assembly in Polymer Matrices Russell J. Composto, University of Pennsylvania, DMR 0907493 • Nanorods (NR) impart polymeric coatings with unique optical properties because the absorption of light varies with NR length. • By grafting a polymer brush to NRs, NR dispersion, aggregation and alignment is controlled by using: • (1) Longer brush (N) to matrix (P) chain lengths, See the dispersion map (top right). • (ACS Nano, 2012; ACS Macro Lett. 1, 115, 2012) • (2) Attractive brush/matrix interactions, • (ACS Nano, 4, 6941, 2010), • (3) a compatibilizing agent in the matrix • See aggregate break-up (bottom right). • (Macromolecules, in press). • Findings are significant because • NR spacing dictates sensitivity for single molecule detection (e.g., biosensor). • Control over side-by-side and end-to-end alignment allows for tuning optical properties across visible and into near infrared regions. (e.g., tunable optical absorption, Near IR window) Nanorod Dispersion Map Shows how brush (N) and matrix (P) lengths determine aggregation and dispersion of NRs. Blending the matrix with a compatibilizer disrupts aggregation of NRs and shifts the color from green to purple.

  2. Broader Impacts Russell J. Composto, University of Pennsylvania, DMR 0907493 High School Lectures Research Experience for High School Students Philly Materials Day • High School Demonstrations and Lectures to AP Chemistry and Materials Science Classes at Central High School, Philadelphia. The PI and Graduate Student Matt Caporizzo (white lab coat) used caramel and ice cream to teach polymerization and nucleation and growth, respectively. • Summer Research Experience for High School Students Mattie Gaye (Parkway West HS; 2nd from left) and Yuri Eckman (Kohelet Yeshiva HS, far right), a HS teacher and 6 undergraduates. • Philly Materials Day 2012. The second annual event included a lecture by the PI (top right). • Materials Science Workshops for Delaware Valley high school science teachers. One day on thermal, mechanical and, new this year, culinary materials. This is the third year for the workshop.

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