The Mid-Hudson Section of the American Chemical Society and the Chemistry Department of Vassar College Announce:
“Morphology Of Effect Materials”
by Dr. Geoff Johnson, Engelhard Corporation,
Wednesday, November 9, 2005 Time: 7:00 PM
Location: Vassar College , Mudd Chemistry Building, 3rd Floor – Science Visualization (Sci Vis) Lab
Contact Joseph Tanski (Vassar) at 845-437-7503 or by e-mail at jotanski@vassar.edu.
About the lecture: Classic pearlescent pigments have evolved far beyond the biologically derived mother-of-pearl that originally inspired them. The class of synthetics that includes pearlescent pigments is now called “effect materials.” This renaming emphasizes that appearance is the sum of many sensory effects, not just color. The most robust effect materials are composed of thin layers of metal oxides coated onto inorganic substrates. The layer structure determines color effects, but the morphology of the substrate plays a significant role in the overall effect. There is also a class of effect materials composed of bismuth oxychloride, in which the morphology of the BiOCl crystal is solely responsible for the observed effects.
About the speaker: Dr. Johnson is originally from South West England, near Bath . He received a BS in Chemistry from the University of Birmingham, UK and his MS in Chemistry from the École Nationale Supérieure de Chimie de Montpellier , France . He earned a PhD in Inorganic Materials Chemistry with Professor Mark Weller at the University of Southampton, UK. Dr. Johnson’s postdoctoral experience includes work in zeolite chemistry with Professor John Parise at SUNY Stony Brook and chemical catalysis at Worcester Polytechnic Institute with Fabio Ribeiro. He joined Engelhard in 2001 as a Research Chemist at the Corporate R&D facility in Iselin , New Jersey . In June 2004, he joined Engelhard’s Appearance and Performance Technology facility in Ossining , New York as a Senior Scientist. Dr. Johnson is a member of the Royal Society of Chemistry, American Chemical Society, Materials Research Society, and International Zeolite Association.
Directions to Vassar College : Vassar College is located at 124 Raymond Avenue in Poughkeepsie , NY . Refer to the following link for driving directions and campus map: http://www.vassar.edu/directions. Enter the main entrance of the campus on Raymond Avenue .
