Catalytic Materials by Design from Hybrid Organic-Inorganics

1998 ◽  
Vol 519 ◽  
Author(s):  
Joël ◽  
J.E. Moreau ◽  
Michel Wong Chi Man
Keyword(s):  
Heterogeneous Catalysts ◽  
Sol Gel ◽  
Inorganic Materials ◽  
Hybrid Network ◽  
Intrinsic Properties ◽  
Reaction Conditions ◽  
Molecular Precursors ◽  
Catalytic Materials ◽  
Materials By Design ◽  
Gel Processing

AbstractThe sol-gel processing of appropriated molecular precursors easily leads to a variety of hybrid organic-inorganic materials with intrinsic properties. This approach is increasingly becoming an interesting way to prepare heterogeneous catalysts. The paper will focus on the use of hybrids for the preparation of selective catalytic materials. Two examples of the use of hybrid polysilsesquioxanes polymers will be given. i) The tailoring of the pore structure of silicas, under mild reaction conditions, based on the temporary introduction of different organic substructures in the hybrid network of polysilsesquioxane gels will be discussed. ii) Also the preparation of new chiral hybrid supports for enantioselective catalysis will be presented.

scholarly journals Hybrid Organic-Inorganic photoresists, a promising class of materials for Optofluidic integration

2019 ◽  
Vol 215 ◽  
pp. 16001
Author(s):  
Jinane Elias ◽  
Pascal Etienne ◽  
Sylvie Calas-Etienne ◽  
Laurent Duffours
Keyword(s):  
Vertical Integration ◽  
Cell Sorting ◽  
Sol Gel ◽  
Inorganic Materials ◽  
Added Value ◽  
Microfluidic Channels ◽  
Ideal Candidate ◽  
Constituent Material ◽  
Optical Pressure ◽  
Gel Processing

Through the efforts to fuse planar optics and microfluidics in order to produce dye lasers, biosensors, trapping and cell sorting device, we can notice the rising interest in optofluidics since early and mid 2000's. However mass production of these devices heavily relies on fast and easy patterning of the constituent material. PDMS, being one of these materials, gained an added value because of its elasticity, hydrophobicity and permeability to gaz. Nonetheless, these specifications are not convenient for all types of applications. The growing capability to use Hybrid Organic-Inorganic materials for the fabrication of integrated optics components and microfluidic channels is what makes this class of materials an ideal candidate for this integration. This work aims to implement, on the same chip, an optical and a microfluidic layer using Sol-Gel processing of Organic-Inorganic materials. The interest in this vertical integration arises from the need to manipulate the fluid in the microchannels using evanescent field optical pressure.

scholarly journals Silane Primers as Adhesion Promotors for Coatings

Proceedings ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 73
Author(s):  
François Perrin ◽  
Anthony Grard ◽  
Lénaïk Belec
Keyword(s):  
Low Temperatures ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Soft Chemistry ◽  
Molecular Precursors ◽  
Chemistry Method ◽  
Gel Processing

Sol-gel processing is a soft-chemistry method to obtain ceramic materials at low temperatures starting from molecular precursors in solution. [...]

Comparative Study of the Sol-Gel and Metallo-Organic Decomposition (MOD) Processes for the Preparation of Inorganic Materials

1992 ◽  
Vol 271 ◽  
Author(s):  
Gustavo R. Paz-Pujalt ◽  
W. Nie ◽  
C. Lurin
Keyword(s):  
Comparative Study ◽  
Chemical Reactivity ◽  
Sol Gel ◽  
Product Formation ◽  
Inorganic Materials ◽  
Kinetic Control ◽  
Reaction Thermodynamics ◽  
Points Of View ◽  
Gel Processing ◽  
Organic Decomposition

ABSTRACTSol-Gel processing and Metallo-Organic Decomposition are contrasted from the thermodynamics and chemical reactivity points of view. Differences and similarities on precursor requirements, processing characteristics, processing intermediates, and product formation pathways are outlined. Some specific examples are presented and their reaction thermodynamics are compared. Some conclusions regarding thermo-dynamic versus kinetic control are drawn from these examples.

Chemical Synthesis of Fine Powders

MRS Bulletin ◽  
1990 ◽  
Vol 15 (1) ◽  
pp. 18-25 ◽  
Author(s):  
J. Livage ◽  
M. Henry ◽  
J.P. Jolivet ◽  
C. Sanchez
Keyword(s):  
High Performance ◽  
Colloidal Particles ◽  
Sol Gel ◽  
Solid Material ◽  
Narrow Particle Size Distribution ◽  
Molecular Precursors ◽  
Inorganic Oxides ◽  
Fine Powders ◽  
Sol Gel Process ◽  
Gel Processing

Interest in the synthesis of submicron monodispersed powders is increasing. Such powders find applications in the ceramic industry when high performance materials are required. Sintering time and temperature can be significantly reduced with powders of narrow particle-size distribution. Fine colloidal particles can be made by a variety of methods, from the vapor phase or the liquid phase.The sol gel process offers new approaches to the synthesis of fine powders. Starting from molecular precursors, such as metal alkoxides or aqueous solutions, an oxide network is obtained via inorganic polymerization reactions. These reactions occur in solution, and the term “sol-gel processing” is often used to describe the synthesis of inorganic oxides by wet chemical methods. It offers many advantages compared to the conventional powder route. One unique advantage is the ability to go all the way from the molecular precursor to the solid material, permitting better control of the entire process and allowing synthesis of “tailor-made” powders.

scholarly journals “Traditional” Sol-Gel Chemistry as a Powerful Tool for the Preparation of Supported Metal and Metal Oxide Catalysts

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 668 ◽  
Author(s):  
Serena Esposito
Keyword(s):  
Metal Oxide ◽  
High Surface ◽  
Sol Gel ◽  
Chemical Properties ◽  
Inorganic Materials ◽  
Synthetic Approach ◽  
Preparation Methods ◽  
Synthesis Conditions ◽  
Molecular Precursors ◽  
Gel Preparation

The sol-gel method is an attractive synthetic approach in the design of advanced catalytic formulations that are based on metal and metal oxide with high degree of structural and compositional homogeneity. Nowadays, though it originated with the hydrolysis and condensation of metal alkoxides, sol-gel chemistry gathers plenty of fascinating strategies to prepare materials from solution state precursors. Low temperature chemistry, reproducibility, and high surface to volume ratios of obtained products are features that add merit to this technology. The development of different and fascinating procedure was fostered by the availability of new molecular precursors, chelating agents and templates, with the great advantage of tailoring the physico-chemical properties of the materials through the manipulation of the synthesis conditions. The aim of this review is to present an overview of the “traditional” sol-gel synthesis of tailored and multifunctional inorganic materials and their application in the main domain of heterogeneous catalysis. One of the main achievements is to stress the versatility of sol-gel preparation by highlighting its advantage over other preparation methods through some specific examples of the synthesis of catalysts.

Gas Permeation and Microstructure of Silica Membranes Prepared Using an Organic Template Approach by Sol-Gel Processing

1996 ◽  
Vol 431 ◽  
Author(s):  
G. Z. Cao ◽  
C. J. Brinker
Keyword(s):  
Sol Gel ◽  
Gas Permeation ◽  
Hybrid Network ◽  
Organic Template ◽  
Silica Xerogels ◽  
Microporous Silica ◽  
Silica Membranes ◽  
Oxidative Pyrolysis ◽  
Lower Extent ◽  
Gel Processing

AbstractThis paper investigates microporous amorphous silica membranes prepared using an organic template sol-gel approach. We find that the introduction of organic methacryloxypropyl ligands results in a reduced average condensation rate and a lower extent of branching that promotes the collapse of the hybrid network upon drying leading to relatively dense hybrid organic-inorganic xerogels and films. Microporous silica xerogels and membranes, prepared by oxidative pyrolysis of the organic templates at 300 °C for 5 hours in oxygen, contained pores with constrictions of approximately 0.35 nm in diameter with a very narrow size distribution, as evidenced by single gas permeation measurements of a series of probe molecules.

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