AVS 57th International Symposium & Exhibition
    Nanometer-scale Science and Technology Tuesday Sessions
       Session NS-TuA

Paper NS-TuA11
All-Diamond Particles Prepared by Layer-by-Layer Deposition for High Performance Liquid Chromatography

Tuesday, October 19, 2010, 5:20 pm, Room La Cienega

Session: Carbon-Based Nanomaterials
Presenter: M.R. Linford, Brigham Young University
Authors: M.R. Linford, Brigham Young University
L.A. Wiest, Brigham Young University
D.S. Jensen, Brigham Young University
A. Dadson, U.S. Synthetic
M.A. Vail, U.S. Synthetic
Correspondent: Click to Email
All-diamond, core-shell particles for HPLC have been prepared by layer-by-layer deposition. The process begins with the amine functionalization of ca. 2 micron diamond particles by their immersion in an aqueous solution of a primary amine-containing polymer, polyallylamine (PAAm). The amine-functionalized microdiamond is then immersed in an aqueous suspension of nanodiamond, which leads to adsorption of the nanodiamond. Alternating immersions in the solutions of PAAm and the nanodiamond suspension are continued until the desired number of nanodiamond layers is formed around the core particle. Finally, the core-shell particles are functionalied with 1,2-epoxyoctadecane to create a C18 phase. Other surface modifications, including cross linking of the PAAm polymer have been demonstrated. Scanning electron microscopy and Brunauer Emmett Teller (BET) surface area and pore size measurements show formation of the expected particles. To date, we have made core-shell particles that can be used for an HPLC separation of a four-component mixture with more than 40,000 plates/m.