NDLI: Surface modification of TiO2 nanoparticles with AHAPS aminosilane: distinction between physisorption and chemisorption

Content Provider	Springer Nature Link
Author	Kassir, Mounir Roques Carmes, Thibault Hamieh, Tayssir Razafitianamaharavo, Angelina Barres, Odile Toufaily, Joumana Villiéras, Frédéric
Copyright Year	2013
Abstract	This paper addresses the surface modification of TiO2 nanoparticles with n-(6-aminohexyl)aminopropyltrimethoxysilane (AHAPS) using various initial aminosilane concentrations. The main objective of this article is to show experimentally the importance of the physisorption during the grafting process. The distinction between chemisorbed and physisorbed aminosilane molecules on TiO2 is thoroughly analyzed. The surface of bare and modified TiO2 particles has been characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) to gain a better understanding of the adsorption mechanism of AHAPS on TiO2. Quantitative information on surface energy of TiO2, in terms of adsorption energy sites and heterogeneity, has been investigated by quasi-equilibrium low-pressure adsorption technique using nitrogen and argon as probe molecules. The FTIR and XPS data are combined to estimate and discuss the chemisorbed and physisorbed contribution. The results demonstrate that both physisorption and chemisorption occurs but they display a different behavior. The physisorbed amounts are much higher than the chemisorbed amounts. This shows that the main part of the adsorbed layer is composed of physisorbed molecules. The physisorbed uptake depends highly on the AHAPS concentration while the chemisorbed amount remains constant. Quasi-equilibrium Ar derivative adsorption isotherms reveal that the AHAPS molecules are mostly located on the {101} and {001} faces of titania and that the two faces display the same reactivity toward AHAPS sorption. Nitrogen adsorption experiments show that the sorption takes place on the three polar surface sites of high energy. The molecules are chemisorbed onto the site displaying the highest energy while they are physisorbed on the two lower energy sites.
Starting Page	1197
Ending Page	1209
Page Count	13
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	19
Issue Number	6
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2013-06-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aminosilane coupling agent Surface modification TiO2 nanoparticles Low-pressure argon and nitrogen adsorption Physisorption Chemisorption Industrial Chemistry/Chemical Engineering Surfaces and Interfaces, Thin Films Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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