Quantitative Analysis and Efficient Surface Modification of Silica Nanoparticles. (31st May 2012)

• Record Type: Journal Article
• Authors: Jung, Hak-Sung; Moon, Doo-Sik; Lee, Jin-Kyu
• Other Names: Gu Hongchen Chen Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2012(2012)
• Publication Date: 2012-05-31
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2012/593471
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : Aminofunctional trialkoxysilanes such as aminopropyltrimethoxysilane (APTMS) and (3-trimethoxysilylpropyl)diethylenetriamine (DETAS) were employed as a surface modification molecule for generating monolayer modification on the surface of silica (SiO2 ) nanoparticles. We were able to quantitatively analyze the number of amine functional groups on the modified SiO2 nanoparticles by acid-base back titration method and determine the effective number of amine functional groups for the successive chemical reaction by absorption measurements after treating with fluorescent rhodamine B isothiocyanate (RITC) molecules. The numbers of amine sites measured by back titration were 2.7 and 7.7 ea/nm 2 for SiO2 -APTMS and SiO2 -DETAS, respectively, while the numbers of effective amine sites measured by absorption calibration were about one fifth of the total amine sites, namely, 0.44 and 1.3 ea/nm 2 for SiO2 -APTMS(RITC) and SiO2 -DETAS(RITC), respectively. Furthermore, it was confirmed that the reactivity of amino groups on the surface-modified silica nanoparticles could be maintained in ethanol for more than 1.5 months without showing any significant differences in the reactivity.