31st Annual Student Research Conference
Colloidal Stability of Hydrophilically Modified beta-NaYF4 Nanocrystals
Dustin C. Gansebom
Dr. Vayujeet Gokhale, Faculty Mentor
In this study, upconverting beta-NaYF4 nanocrystals are hydrophilically modified to form aqueous colloids for potential use in security printing. The beta-NaYF4 surface is modified by intercalating poly(maleic anhydride-alt-1-octadecene) (PMAO) into the oleic acid capping ligands to form a bilayer. The effect of crosslinking the PMAO coating with bis(6-aminohexyl)amine on aggregation and bilayer stability is examined. Dynamic Light Scattering and zeta-potential measurements suggest that colloids are fairly stable. The presence and quality of the bilayers are verified with thermogravimetric analysis and electron microscopy. Colloids are observed to begin to aggregate after one day with improved stability for lower concentration samples.
Keywords: Nanoparticles, Upconversion, Colloids
Topic(s):Chemistry
Physics
Presentation Type: Oral Paper
Session: 204-4
Location: MG 1098
Time: 10:15