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Biomaterials Girls night out at Polymers in Medicine and Biology

Polymeric Phosphonate Zwitterions Saturate Surfaces of Metal Oxide Nanoparticles Judy S. Riffle, Virginia Polytechnic Institute and State University, DMR 0805179.

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Biomaterials Girls night out at Polymers in Medicine and Biology

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  1. Polymeric Phosphonate Zwitterions Saturate Surfaces of Metal Oxide NanoparticlesJudy S. Riffle, Virginia Polytechnic Institute and State University, DMR 0805179 Polymers with 1-3 ammonium phosphonate zwitterions adsorb in high concentrations onto magnetite nanoparticles from CHCl3. Analogous compositions are not achieved if adsorption is attempted from water where the repulsive effects from a high charge density near the particle surfaces become problematic. Moreover, it is postulated that the near neutral charge of the zwitterion enables adsorption of such high densities of charged species onto the nanoparticles. Homo- and block copolyethers with 3 phosphonate anchors saturate the surfaces of magnetite to produce nanostructures that exist as single particles in phosphate buffers simulating physiological media. One goal is a tool for single cell tagging for in vivo cell tracking.

  2. Polymers in Medicine and Biology – a Workshop organized by Judy Riffle, Kathryn Uhrich and Buddy Ratner, June, 2009Judy S. Riffle, Virginia Polytechnic Institute and State University, DMR 0805179 Polymers in Medicine and Biology 2009, June 14-17, 2009, hosted by the Division of Polymer Chemistry of the ACS, attracted 100 participants from small and large companies and academe. Featured sessions included contributions from start-up biotechnology companies focused on polymeric materials and a session highlighting peer reviewed journals in this field. The women professionals enjoyed a gala night out of networking and friendship! Biomaterials Girls night out at Polymers in Medicine and Biology Left to right: Elizabeth Hedberg-Dirk, U. New Mexico; Dawn Smith, CibaVision; Cheryl Ratner; Paula Hammond, MIT; Sue Mecham, Polymer Solutions; Elizabeth Cosgriffe-Hernandez, Texas A&M; Efrosini Kokkoli, U. Minn.; Michelle Johnson, Johnson & Johnson; Judy Riffle, VA Tech; Kathryn Uhrich, Rutgers; Yi Yan Yang, Inst. of Bioeng., Singapore; Melissa Grunlan, Texas A&M; Fabiana Madeiros, Butante-Cidade U., Sao Paulo.

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