Concept

Stöber process

Publications associées (56)

Evaluating the critical thickness of TiO2 layer on insulating mesoporous templates for efficient current collection in dye-sensitized solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Pascal Comte, Chenyi Yi, Aravind Kumar Chandiran

In this paper, we present a way of utilizing thin and conformal overlayer of titanium dioxide on insulating mesoporous template as a photoanode for dye-sensitized solar cells (DSC). Different thicknesses of TiO2 ranging from 1 nm to 15 nm are deposited on ...

Wiley-Blackwell2013

A silica sol-gel design strategy for nanostructured metallic materials

Michael Graetzel, Scott Charles Warren

Batteries, fuel cells and solar cells, among many other high-current-density devices, could benefit from the precise meso-to macroscopic structure control afforded by the silica sol-gel process. The porous materials made by silica sol-gel chemistry are typ ...

Nature Publishing Group2012

Laser-Heating-Induced Displacement of Surfactants on the Water Surface

Sylvie Roke

We report a combined vibrational sum-frequency generation (SFG) spectroscopy, Brewster angle microscopy (BAM), and ellipsometry study of different surfactants on water as a function of surfactant density. Vibrational SFG spectra of surfactants on the water ...

2012

Synthesis and Biological Response of Size-Specific, Monodisperse Drug–Silica Nanoconjugates

Li Tang

Drug-containing nanoparticles (NPs) with monodisperse, controlled particle sizes are highly desirable for drug delivery. Accumulating evidence suggests that NPs with sizes less than 50 nm demonstrate superior performance in vitro and in vivo. However, it i ...

American Chemical Society2012

Effect of mixing on the early hydration of alite and OPC systems

Karen Scrivener, Emmanuel Gallucci, Patrick Juilland, Aditya Kumar

The kinetics of hydration of cementitious materials is sensitive to the mixing procedure. High shear mixing conditions lead to an increase in the kinetics of hydration at early age compared to low shearing conditions such as hand mixing. In this study the ...

Pergamon-Elsevier Science Ltd2012

Nanostructured high refractive index titanium oxide films

Jürgen Brugger, Vaida Auzelyte, Agnese Virginia Savegnago

Titanium oxide due to its optical properties, such as high refractive index, transparency to visible light and photocatalytic properties is being used in a large number of devices such as micro-optical elements and solar cells. The fabrication of TiO2 micr ...

2011

Core-shell Au@(TiO2, SiO2) nanoparticles with tunable morphology

Pierre Stadelmann, Anas Mouti

A novel approach based on the Stober method allows breaking of the symmetry of core-shell systems based on metallic core and metal oxide shell. By adjusting the proportion of the TiO2 precursor with regard to the silica precursor, different morphologies of ...

2010

Low-Stress UV-Curable Hyperbranched Polymer Nanocomposites for High-Precision Devices

Valérie Geiser

The aim of this thesis was to investigate the process-structure-property relationships of UV-curable hyperbranched polymer (HBP)/silica nanocomposites. Special attention was paid to the interplay between photo-conversion, rheological behavior, shrinkage, a ...

EPFL2010

Micropatterning of Hydrogels by Soft Embossing

Matthias Lütolf, Thierry Laroche, Stefan Kobel, Samy Gobaa, Monika Limacher

Conventional in situ hydrogel micropatterning techniques work successfully for relatively stiff hydrogels, but they often result in locally damaged surfaces upon demolding in the case of soft and fragile polymer networks formed at low precursor concentrati ...

American Chemical Society2009

Ag-doped carbon aerogels for removing halide ions in water treatment

Urs von Gunten

The objective of this study was to analyze the efficiency of silver(Ag)-doped carbon aerogels for the removal of bromide (Br-) and iodide (I-) from drinking waters. Textural characterization of Ag-doped aerogels showed that an increase in the Ag dose added ...

2007

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