|| Toward molecular design of oxide precursors for advanced materials
by Liliane G. Hubert-Pfalzgraf
Chemical routes to materials are based on transformations in solution such as sol-gel processing, hydro or solvo thermal syntheses, Metal Organic Decomposition (MOD), or in the vapour phase chemical vapor deposition
(CVD). Most chemical routes rely on the availability of appropriate “metal-organic” molecules as precursors.
Among the various precursors of metal oxides namely metal b-diketonates and metal carboxylates, metal alkoxides are the most versatile. They are available for nearly all elements and cost-effective synthesis from cheap feedstoks have been developed for some.
Professor Liliane G. Hubert-Pfalzgraf make the point.
Optical Materials by Sol-Gel Method
Professor Renata Reisfeld
and his research team from the Hebrew
University of Jerusalem have investigated for more than a
decade sol-gel derived optical materials. She give us today an
overview of a broad palette of such materials, investigated by
her group, and potentially useful for sensors, lasers,
solar energy concentrators, variable transmission windows, and
Aerogels... 25 years ago
by Michel Prassas
25 years ago, glass scientists were intensively looking for low temperature
processing routes for making glass. The discovery that monolithic gels can
be transformed in glassy materials at half the conventional melting
temperature, became a useless reality with extraordinary implications. The
topic drained a great number of researchers from a variety of disciplines
and open the window of what commonly call today the sol-gel process.
An open and versatile chemical processing route to a variety of
inorganic and organic-inorganic materials with nanotailored structures and
||What are hybrids
by Prof. Clement Sanchez
An incredible amount of
research investigations have appeared the last 10 years in the field of hybrids materials
indicating the growing interest of chemists, physicists and materials researchers to fully
exploit this technical opportunity for creating materials and device with benefits of the
best of the two worlds namely inorganic and organic...
A low temperature process for materials of the new millennium
by Prof. J. Phalippou
A short introduction to the Sol-Gel methods and the ways to obtain
materials for a variety of applications
||YVO4:Ln (Ln= Eu,
Arnaud Huignard, Thierry Gacoin and Jean-Pierre Boilot
An intensive research effort is directed the last years
towards the development of stable quantum dots with high luminescent properties for
applications in displays, optical telecommunications systems, lasers and biological
luminescent probes. Sol-Gel synthetic routes, widely used in this field,
allows size control, narrow size distributions, and surface
chemistry engineering of the synthesized nanoparticles.
The solid state chemistry group of "Ecole Polythechnique" in France has
recently developed a way to manufacture high
luminescent Ln:YVO4 nanoparticles with quantum yields approaching 40 %. Film
nanocomposites prepared either by spin or dip techniques shows under UV excitation a
bright red luminescence .
||Luminescence properties optimization of Pr in CatiO3
A Power point presentation
by P.T. Diallo, P.Boutinaud, R. Mahiou,
and thermal conductivity of model organic aerogels
by Anthony P. Roberts
Aerogels are a promising material for a wide
range of applications due to their thermal, optical and mechanical
properties. For example, aerogels are among the best thermal insulating
solid materials known. It is important to link aerogel properties to
their complex internal microstructure, and to understand how such
properties can be optimized for a given application..
||Influence of OH groups on the
spectral characteristics of Eu doped Sol-Gel hybrids (pdf file)
- A Power point presentation
by A.C. Franville, D. Zambon, R. Mahiou
An Introduction to the cleaning procedures
by Dr W. Birch
Substrate cleaning, is as important as the chemistry of the
precursor sol-gel solution used to make the films. This tutorial
provides useful information and practical advice for best cleaning
operations previous to any deposition process.
Rare -earth doped
transparent nanoparticulate glass-ceramics
by M. Mortier, M. Génotelle, G. Patriarche
dioxide as infrared active coating
Technologies for Glass
H. Schmidt and M. Mennig
One advantage of wet coating techniques
is, that molecular structures developed by chemical synthesis can be used to develop new
properties, or to develop new
desired molecular structures by heat-treatment and subsequent chemical reaction on the
surface. After introducing the advantages of wet coating technologies the
authors describe the different wet coating techniques including,
dip, spin silk screen, roll coating, laminar flow...
of silica gels doped with magnetic nanoparticles
by D. Jamon, J. J. Rousseau, H.
Roux, V. Cabuil
orientation can be fixed if the gels are prepared under magnetic
field. Permanent birefringent optical plates can easily be prepared this
way with tailored properties.
Presentation given at the French "Nanoparticles" workshop
temperature synthesis of Zircon by sol-gel process
P. Leture M. Prassas, A. Lecomte and A. Dauger
Manufacturing of ultra-fine powders has become of great interest in ceramic
technologies. Zircon phase which has an excellent chemical durability and
refractoriness is not easily obtained at low temperatures even starting with
compositions. Sol-gel processing allows Zircon nanopowder to be formed at
temperature lower than 1000°C