Nano Archive

The effect of excess surfactants on the adsorption of iron oxide nanoparticles during a dip-coating process

Kwon, Chang-Woo and Yoon, Tae-Sik and Yim, Sung-Soo and Park, Sang-Hyun and Kim, Ki-Bum (2009) The effect of excess surfactants on the adsorption of iron oxide nanoparticles during a dip-coating process. Journal of Nanoparticle Research, 11 (4). pp. 831-839.

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://www.springerlink.com/content/92330l1341760n...

Abstract

The effect of excess surfactants (oleic acids) in a colloidal solution on the adsorption behavior of 9.5-nm-sized, sterically stabilized iron oxide (γ-Fe2O3) nanoparticles on hydrogen terminated Si (Si:H) substrates during a dip-coating process is examined. While the particle coverage follows a type of Langmuir adsorption isotherm as initially increasing and subsequently saturating with increasing particle concentration, it also critically depends on the excess surfactant concentration in the solution. For instance, it is noted that by adding the oleic acids from 0.06 to 2.80 × 1018 ml−1 in the solution with 4.65 × 1013 ml−1 particle concentration, the coverage is gradually reduced from 0.42 to 0.25. In addition, increasing surfactant concentration distinctly changes the morphology of a self-assembled particle layer from densely distributed smaller clusters to sparsely connected, larger ones with enlarged space. The reduced coverage and enlarged cluster size with increasing oleic acid concentration are explained by the reduced interaction energy between particle and substrate and the increased capillary force between particles.

Item Type:Article
ID Code:4531
Deposited By:Prof. Alexey Ivanov
Deposited On:08 May 2009 09:48
Last Modified:08 May 2009 09:53

Repository Staff Only: item control page