Electrostatic and Hydrophobic Interactions Involved in CNT Biofunctionalization with Short ss-DNA

MARIA L. CAROT; ROBERTO M. TORRESI; CARLOS D. GARCIA; MARIA J. ESPLANDIU; CARLA E. GIACOMELLI

AMER CHEMICAL SOC

Año: 2010 vol. 114 p. 4459 - 4459

font size="2" face="Times-Roman"> This work is aimed at studying the adsorption mechanism of short chain 20-mer pyrimidinic homoss-DNA (oligodeoxyribonucleotide, ODN: polyC20 and polyT20) onto CNT by reflectometry. To analyze the experimental data, the effective-medium theory using the Bruggemann approximation represents a suitable optical model to account for the surface properties (roughness, thickness, and optical constants) and the size of the adsorbate. Systematic information about the involved interactions is obtained by changing the physicochemical properties of the system. Hydrophobic and electrostatic interactions are