Concept

Procédé sol-gel

Publications associées (342)

High Rate Growth of Microcrystalline Silicon by VHF-GD at High Pressure

Microcrystalline silicon growth using very high frequency-glow discharge PECVD has been studied under conditions of high pressure and high VHF-power conditions. Hereby, the influence of the total gas flow and the silane concentration on the deposition rate ...

2003

Insights in the sol-gel processing of Pb(Mg1/3Nb2/3)O-3. The synthesis and crown structure of a new lead magnesium cluster: Pb6Mg12(mu-OAc)(6)( mu(2), eta(2)-OAc)(18)(mu(3), eta(2)-OC2H4OPri)(12)

Nava Setter, Zian Kighelman

The synthesis and molecular structure of a Pb-Mg bimetallic acetatoalkoxide (Pb-6,Mg-12( mu-OAc)(6)(mu(2), eta(2)-OAc)(18)(mu(3), eta(2)-OC2H4OPr1)(12), space group R-3, a = b = 30.032(2), c = 18.855(2) Angstrom, alpha = beta = 90degrees, gamma = 120degree ...

2002

Micro-replication of Optical Lenses in Glass using Sol Gel Technology

Martinus Gijs, Abdeljalil Sayah, Virendra Kumar Parashar

A new method to realize arrays of micro-lenses using a sol gel glass replication technology is presented. Polydimethyl-siloxane (PDMS) master structures are used for the replication of thin glass membranes, which, by an appropriate annealing procedure, res ...

2002

Sol-gel derived Pb(Sc0.5Nb0.5)O-3 thin films: Processing and dielctric properties

Nava Setter, Dragan Damjanovic, Ji Hyun Kim, Kyle Brinkman

Relaxor Pb(Sc1/2Nb1/2)O-3 (PSN) thin films without pyrochlore phase were processed from the modified alkoxide solution precursors. The preparation of single phase PSN thin films has a narrow processing window due to the appearance of an undesirable pyrochl ...

2002

What causes differences of C-S-H gel grey levels in backscattered electron images?

Karen Scrivener

Backscattered electron (BSE) images of heat-cured concretes show alite grains surrounded by inner C-S-H gel of two distinct grey levels (referred to as two-tone inner C-S-H gel). The lighter rim forms at elevated temperature whereas the darker rim develops ...

2002

Phase equilibria and glass transition in colloidal systems with short-ranged attractive interactions: Application to protein crystallization

Giuseppe Foffi, Francesco Sciortino

We have studied a model of a complex fluid consisting of particles interacting through a hard-core and short-range attractive potential of both Yukawa and square-well form. Using a hybrid method, including a self-consistent and quite accurate approximation ...

2002

Liquid metal embrittlement studies on model systems wiht respect to the spallation target technology: the importance of nanometre-thick films

Vincent Laporte

Liquid metal embrittlement (LME) is illustrated on the Cu-Bi and Cu-PbBi systems at 300 C using either constant strain-rate tests at 10(-4) s(-1) or constant load tests at 25% of yield stress. Intergranular penetration was studied in the Ni-Bi system at 70 ...

2002

Relationships between physicochemical properties and the photoreactivity of four biorecalcitrant phenyl-urea herbicides in aqueous TiO2 suspension

César Pulgarin

The degradation of metobromuron (MB), isoproturon (IP), chlortoluron (CT), and chlorbromuron (CB) in heterogeneous photocatalytic solution via TiO2 was studied in detail. The influence of parameters such as TiO2 and herbicide concentration has been investi ...

2002

Photocatalytic film of iron oxide, electrode with such a photocatalytic film, method of producing such films, photoelectrochemical cell with the electrode and photoelectrochemical system with the cell, for the cleavage of water into hydrogen and oxygen

Michael Graetzel, Ravindranathan Thampi

The Photocatalytic film of semiconducting iron oxide (Fe2O3), contains an n-dopant, or a mixture of n-dopants, or a p-dopant or a mixture of p-dopants. Electrode consists of a substrate, with one ore more films or photocatalytic arrangements of film of sem ...

(The Hydrogen Solar Production Company Limited, UK).2002

Materials and methods relating to encapsulation

David Hunkeler, Annemie Rehor

Methods are provided for producing microcapsules based on two oppositely charged polymers, in particular to optimise the permeability and mechanical stability of microcapsules. The capsules are formed by introducing liquid droplets from an aqueous solution ...

2001

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