New Insight into Mechanisms of Sol-Gel Process and New Materials and Opportunities for Bioencapsula-tion and Biodelivery

2008 ◽  
pp. 139-153
Author(s):  
Vadim G. Kessler ◽  
Gulaim A. Seisenbaeva
Keyword(s):  
Sol Gel ◽  
New Materials ◽  
Sol Gel Process ◽  
Insight Into

scholarly journals Mechanistic insight into the non-hydrolytic sol–gel process of tellurite glass films to attain a high transmission

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 2404-2415
Author(s):  
Xuanzhao Pan ◽  
Jiangbo Zhao ◽  
Gujie Qian ◽  
Xiaozhou Zhang ◽  
Yinlan Ruan ◽  
...  
Keyword(s):  
Tellurite Glass ◽  
Sol Gel ◽  
Amorphous Film ◽  
High Refractive Index ◽  
Functional Nanoparticles ◽  
Mechanistic Insight ◽  
Sol Gel Process ◽  
Transmission Window ◽  
Insight Into ◽  
Generation Hybrid

This work develops a high-transparency amorphous film with a wide transmission window and high refractive index, which can potentially meet the strong demand of integrating functional nanoparticles for the next-generation hybrid optoelectronic films.

Deep insight into the luminescence performance of Li2MgSiO4:Mn2+ green phosphor synthesized by a sol-gel process

2021 ◽  
pp. 118563
Author(s):  
Zihao Wang ◽  
Jiajun Yu ◽  
Fei Tang ◽  
Changcheng Zheng ◽  
Lizhen Zhang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Deep Insight ◽  
Green Phosphor ◽  
Sol Gel Process ◽  
Insight Into ◽  
Luminescence Performance

Sol-Gel Networks: Fundamental Investigations of the Chemistry of Sol-Gel Silicate Glasses and Poly(Siloxane) Toughened Silicates

1989 ◽  
Vol 155 ◽  
Author(s):  
M. Spinu ◽  
J. E. Mcgrath
Keyword(s):  
Sol Gel ◽  
Processing Conditions ◽  
Organic Modifiers ◽  
New Materials ◽  
Reaction Parameters ◽  
Free System ◽  
Sol Gel Process ◽  
Subsequent Conversion ◽  
Strong Acids ◽  
Gel Network

ABSTRACTThe low-temperature sol-gel process opens a number of new materials possibilities for generation of glasses with predetermined properties by the incorporation of organic modifiers into the network. Polysiloxanes are potentially interesting organic modifiers for toughening and possibly surface-modifying the silicate networks. Some fundamental studies of the hydrolysis and condensation processes in a tetramethylorthosilicate (TMOS) system, in the absence of added catalyst, have been conducted using 1H and 29Si NMR. The effects of some of the reaction parameters and processing conditions for the subsequent conversion of the gel to monolithic dried gels by heat treatment have been investigated by techniques such as thermal analysis and mass spectroscopy. Procedures which employ mild pressures have been established that permit the generation of monolithic products which show greatly reduced cracking tendencies. Finally, methoxy functionalized poly(dimethylsiloxane) oligomers that can react into the sol-gel network have been prepared. The intermediates are commercially accessible and the process is scaleable. Utilization of a catalyst-free system eliminates the tendency of the siloxane modifier to undergo undesired rearrangements that are known to occur in the presence of strong acids or bases.

scholarly journals Organically Modified Silicates by the Sol-Gel Process

1984 ◽  
Vol 32 ◽  
Author(s):  
H. Schmidt
Keyword(s):  
Sol Gel ◽  
New Materials ◽  
Organic Components ◽  
Organically Modified Silicates ◽  
Sol Gel Process ◽  
Inorganic As ◽  
Organically Modified ◽  
General Aspects

ABSTRACTThe introduction of organic groups into inorganic networks by the sol-gel process opens the possibility for the preparation of new materials, and typical properties resulting from inorganic as well as from organic components may be combined. Some general aspects and different examples of material developments are reviewed.

Tailored Molecular Precursors of Yttrium Oxide Using Functional Alcohols and Acetylacetone as Modifiers

1990 ◽  
Vol 180 ◽  
Author(s):  
Liliane G. Hubert-Pfalzgraf ◽  
Olivier Poncelet ◽  
Jean-Claude Daran
Keyword(s):  
Sol Gel ◽  
Advanced Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Precursors ◽  
Process Comparison ◽  
Bridging Ligand ◽  
Sol Gel Process ◽  
Hydrolysis Of ◽  
Insight Into

ABSTRACTYttrium is involved as oxide in a variety of advanced materials. Hydrolysis of its most common alkoxide, yttrium oxoisopropoxide Y5O(OiPr)13 , is difficult to control as a result of the high electropositivity of the metal. Functional alcohols such as 2-methoxyethanol and acetylacetone have thus been used as modifiers. These tailored precursors have been fully characterized (single crystal X-Ray diffraction, IR, NMR. ). The tendency of methoxyethanol to act as a bridging ligand and to stabilize high oligomers - Y(OC2H4OMe)3 is a decamer - gives some insight into its behavior as “network builder”. The unexpected cleavage of acetylacetone offers a route to an interesting acetatoacetylacetonate derivative, Y2(OAc)2(acac)4(H2O)2 , but also suggest that this classical “modifier” could be affected by the hydrolysis-polycondensation reactions of the metallic species during the sol-gel process. Comparison of the hydrolysis behavior of the different precursors was performed.

Macrocellular Silica Monoliths Hierarchically Textured: Mesostructured Si-HIPE Materials

2004 ◽  
Vol 847 ◽  
Author(s):  
F. Carn ◽  
A. Colin ◽  
R. Backov
Keyword(s):  
Soft Matter ◽  
Volume Fraction ◽  
Sol Gel ◽  
General Context ◽  
New Materials ◽  
Silica Monoliths ◽  
Sol Gel Process ◽  
Ph Conditions ◽  
Nice Tool ◽  
Concentrated Emulsion

ABSTRACTInterface between sol-gel process and soft matter appears recently as a very nice tool to generate new materials with complex textures or/and structures extended at various length scales. In this general context, hierarchical inorganic porous monoliths have been prepared using a double templates procedure, namely concentrated emulsion as a macroscopic pattern and mesoscopic micellar templates. The texture of those monoliths can vary dramatically playing either with the oil volume fraction, synthetic pH conditions or the emulsification process. These materials show interconnected macroporosity associated to vermicular-type mesostructuration with an average mesoporosity of 800 m2/g associated to bulk density as low as 0.08 g cm-3 which is comparable to values obtained for silica aerogel.

Effects of inorganic acids and divalent hydrated metal cations (Mg2+, Ca2+, Co2+, Ni2+) on γ-AlOOH sol–gel process

2015 ◽  
Vol 17 (41) ◽  
pp. 27391-27398 ◽  
Author(s):  
Jian Zhang ◽  
Yuguo Xia ◽  
Li Zhang ◽  
Dairong Chen ◽  
Xiuling Jiao
Keyword(s):  
Essential Role ◽  
Sol Gel ◽  
Metal Cations ◽  
New Materials ◽  
Inorganic Acids ◽  
Sol Gel Process

In-depth understanding of the sol–gel process plays an essential role in guiding the preparation of new materials.

Insight into the mechanism of boron-doping of carbon aerogel for enhancing the activity of low-temperature selective catalytic reduction of NO with NH3

2021 ◽  
Author(s):  
Minghe Yang ◽  
He Wang ◽  
Shuangling Jin ◽  
Rui Zhang ◽  
Yan Wang ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Phenylboronic Acid ◽  
Sol Gel ◽  
Boron Doping ◽  
Carbon Aerogel ◽  
Resorcinol Formaldehyde ◽  
Sol Gel Process ◽  
Organic Gel ◽  
Insight Into

Boron-doping of carbon aerogel (BCA) was enabled by incorporating phenylboronic acid in the sol-gel process into the organic gel from resorcinol-formaldehyde and the role of boron-doping on the catalytic activity...

The crystallization of thin-film ceramics

1992 ◽  
Vol 50 (1) ◽  
pp. 338-339
Author(s):  
J.M. Schwartz ◽  
L.F. Francis ◽  
L.D. Schmidt ◽  
P.S. Schabes-Retchkiman
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Sol Gel ◽  
Processing Route ◽  
Small Areas ◽  
Ceramic Thin Films ◽  
Complex Shapes ◽  
Sol Gel Process ◽  
Ceramic Precursors ◽  
Crystalline Ceramic

Ceramic thin films and coatings are of interest for electrical, optical, magnetic and thermal barrier applications. Critical for improved properties in thin films is the development of specific microstructures during processing. To this end, the sol-gel method is advantageous as a versatile processing route. The sol-gel process involves depositing a solution containing metalorganic or colloidal ceramic precursors onto a substrate and heating the deposited layer to form a crystalline or non-crystalline ceramic coating. This route has several advantages, including the ability to create tailored microstructures and properties, to coat large or small areas, simple or complex shapes, and to more easily prepare multicomponent ceramics. Sol-gel derived coatings are amorphous in the as-deposited state and develop their crystalline structure and microstructure during heat-treatment. We are particularly interested in studying the amorphous to crystalline transformation, because many key features of the microstructure such as grain size and grain size distribution may be linked to this transformation.

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