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Title: Tailored Jeffamine molecular tools for ordering mesoporous Silica
Author: May Masnou, Anna
Pasc, Andreea
Stébé, Marie José
Gutiérrez González, José María, 1953-
Porras Rodríguez, Montserrat
Blin, Jean Luc
Keywords: Química de superfícies
Surface chemistry
Issue Date: 31-May-2012
Publisher: American Chemical Society
Abstract: Herein, we report the formation of organized mesoporous silica materials prepared from a novel nonionic gemini surfactant, myristoyl-end capped Jeffamine, synthesized from a polyoxyalkyleneamine (ED900). The behavior of the modified Jeffamine in water was first investigated. A direct micellar phase (L1) and a hexagonal (H1) liquid crystal were found. The structure of the micelles was investigated from the SAXS and the analysis by Generalized Indirect Fourier Transformation (GIFT), which show that the particles are globular of coreshell type. The myristoyl chains, located at the ends of the amphiphile molecule are assembled to form the core of the micelles and, as a consequence, the molecules are folded over on themselves. Mesoporous materials were then synthesized from the self-assembly mechanism. The recovered materials were characterized by SAXS measurements, nitrogen adsorptiondesorption analysis, transmission and scanning electron microscopy. The results clearly evidence that by modifying the synthesis parameters, such as the surfactant/silica precursor molar ratio and the hydrothermal conditions, one can control the size and the nanostructuring of the resulting material. It was observed that, the lower the temperature of the hydrothermal treatment, the better the mesopore ordering.
Note: Versió postprint del document publicat a:
It is part of: Langmuir, 2012, vol. 28, num. 25, p. 9816-9824
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ISSN: 0743-7463
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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