Activation of the sol–gel process by visible light-emitting diodes (LEDs) for the synthesis of inorganic films

2015 ◽  
Vol 39 (7) ◽  
pp. 5686-5693 ◽  
Author(s):  
Suqing Shi ◽  
Xavier Allonas ◽  
Céline Croutxé-Barghorn ◽  
Abraham Chemtob
Keyword(s):  
Visible Light ◽  
Light Source ◽  
Hybrid Materials ◽  
Solar Irradiance ◽  
Sol Gel ◽  
Simple Approach ◽  
Light Emitting ◽  
Acid Generation ◽  
Inorganic Films ◽  
Sol Gel Process

Photosensitized acid generation opens the possibility of using a visible LED light source for inorganic photo sol–gel process. It also provides a simple approach for sustainable synthesis of inorganic or hybrid materials under solar irradiance.

UV Curable Organic-Inorganic Hybrid Materials

2000 ◽  
Vol 628 ◽  
Author(s):  
Guang-Way Jang ◽  
Ren-Jye Wu ◽  
Yuung-Ching Sheen ◽  
Ya-Hui Lin ◽  
Chi-Jung Chang
Keyword(s):  
Hybrid Materials ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Solution Ph ◽  
Uv Curable ◽  
Inorganic Hybrid ◽  
Degradation Temperature ◽  
Sol Gel Process ◽  
The Stability ◽  
Thermal Degradation Temperature

This work successfully prepared an UV curable organic-inorganic hybrid material consisting of organic modified colloidal silica. Applications of UV curable organic-inorganic hybrid materials include abrasion resistant coatings, photo-patternable thin films and waveguides. Colloidal silica containing reactive functional groups were also prepared by reacting organic silane and tetraethyl orthosilicate (TEOS) using sol-gel process. In addition, the efficiency of grafting organic moiety onto silica nanoparticles was investigated by applying TGA and FTIR techniques. Experimental results indicated a strong interdependence between surface modification efficiency and solution pH. Acrylate-SiO2 hybrid formation could result in a shifting of thermal degradation temperature of organic component from about 200°C to near 400°C. In addition, the stability of organic modified colloidal silica in UV curable formula and the physical properties of resulting coatings were discussed. Furthermore, the morphology of organic modified colloidal silica was investigated by performing TEM and SEM studies‥

The preparation of poly(methylsilsesquioxane) network-polyimide hybrid materials by the sol-gel process and their properties

1994 ◽  
Vol 6 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Yoshitake Iyoku ◽  
Masa-aki Kakimoto ◽  
Yoshio Imai
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Tensile Modulus ◽  
Hybrid Films ◽  
Elongation At Break ◽  
Dimethyl Acetamide ◽  
Flexible Films ◽  
Sol Gel Process ◽  
Heating Up ◽  
Silicone Content

Poly(methylsilsesquixoane) network (silicone)-polyimide hybrid materials were successfully prepared by the sol-gel reaction of methyltriethoxysilane (MTES). The ethoxysilyl group in MTES was hydrolyzed and polycondensed in the solution of the polyamic acid, derived from pyromellitic dianhydride and bis(4-aminophenyl)ether, in N,N-dimethyl-acetamide (DMAc). The hybrid films were obtained by casting the reaction mixture, followed by heating up to 300°C. The hybrid materials containing 0-60wt% of silicone afforded flexible films. The films containing less than 7 wt% silicone were yellow and transparent, whereas the films with higher silicone content were yellow and opaque. Silicone particles with a diameter of around 1-10 μm were observed in the fracture surface of the hybrid films by scanning electron microscopy. Although the tensile strength and tensile modulus of the films obtained decreased with increasing silicone content. the value of the elongation at break remained at 60% up to 30% silicone content.

Influence of Al/Nd ratio on light-emitting properties of Nd-doped glass prepared by sol-gel process

1999 ◽  
Author(s):  
Qing Xiang ◽  
Yan Zhou ◽  
Yee Loy Lam ◽  
Boon Siew Ooi ◽  
Yuen Chuen Chan ◽  
...  
Keyword(s):  
Sol Gel ◽  
Light Emitting ◽  
Sol Gel Process ◽  
Doped Glass

Facile and scalable design of light-emitting and ROS-generating hybrid materials made of polyurea gels embedding a molybdenum cluster-based salt

2021 ◽  
Author(s):  
Natana Jesus ◽  
Ricardo Oliveira ◽  
Maria Amela-Cortes ◽  
Noee Dumait ◽  
Stéphane Cordier ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Light Emitting ◽  
Molybdenum Cluster ◽  
Scalable Design

Here, we demonstrate a facile and scalable preparation via sol-gel chemistry of hybrid polyurea gels containing various amount of phosphorescent inorganic octahedral molybdenum cluster-based ternary salts, namely Cs2Mo6Br14. The influence...

Organic–inorganic hybrids having a talc-like structure as suitable hosts to guest a wide range of species

2018 ◽  
Vol 47 (9) ◽  
pp. 2925-2932 ◽  
Author(s):  
J. Brendlé
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Step Method ◽  
Mild Conditions ◽  
Condensation Reactions ◽  
Wide Range ◽  
Sol Gel Process ◽  
Hydrolysis And Condensation ◽  
One Step

The sol–gel process involving hydrolysis and condensation reactions is an attractive way to form siloxane based hybrid materials since it is a one-step method performed under mild conditions.

Homogeneous phase synthesis of chitosan silica hybrid materials in ionic liquid medium and adsorption of Fe(III) from aqueous solutions

2019 ◽  
Vol 38 (9) ◽  
pp. 586-597 ◽  
Author(s):  
Ananda S. Amarasekara ◽  
Deping Wang
Keyword(s):  
Ionic Liquid ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Phase Reaction ◽  
Phase Synthesis ◽  
Homogeneous Phase ◽  
Sol Gel Process ◽  
Hydrolysis Of ◽  
Silica Hybrid ◽  
Ionic Liquid Medium

Two chitosan silica hybrid materials were prepared by a two-step process in 78–84% yields using the homogeneous phase reaction of 3-(triethoxysilyl)propyl isocyanate with chitosan dissolved in 1-n-butyl-3-methylimidazolium chloride ionic liquid (∼10% w/w), which was followed by NH4OH catalyzed hydrolysis of triethoxysilyl groups and then sol-gel process. These new hybrid materials were shown to adsorb up to about 95% of Fe3+ from 5 × 10−4 M aqueous solution at room temperature in 24 h.

Carboranyl Units Bringing Unusual Thermal and Structural Properties to Hybrid Materials Prepared by Sol−Gel Process

2006 ◽  
Vol 18 (18) ◽  
pp. 4344-4353 ◽  
Author(s):  
Arántzazu González-Campo ◽  
Bruno Boury ◽  
Francesc Teixidor ◽  
Rosario Núñez
Keyword(s):  
Structural Properties ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Sol Gel Process

scholarly journals Control of Membrane Fouling in Organics Filtration Using Ce-Doped Zirconia and Visible Light

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 534 ◽  
Author(s):  
Fabrício Bortot Coelho ◽  
Chiara Gionco ◽  
Maria Paganini ◽  
Paola Calza ◽  
Giuliana Magnacca
Keyword(s):  
Visible Light ◽  
Surface Waters ◽  
Membrane Fouling ◽  
Sol Gel ◽  
Fouling Resistance ◽  
Environmental Implications ◽  
Light Emitting ◽  
Treatment Processes ◽  
Further Development ◽  
Zirconia Nanoparticles

Membrane fouling has been a major issue in the development of more efficient water treatment processes. Specifically in surface waters filtration, organic matter, such as humic-like substances, can cause irreversible fouling. Therefore, this study evaluates the activity of a photocatalytic layer composed of Ce-doped zirconia nanoparticles in improving the fouling resistance during filtration of an aqueous solution of humic acid (HA). These nanoparticles were prepared by hydrothermal and sol–gel processes and then characterized. Before the filtration experiments, the photodegradation of HA catalyzed by Ce-doped zirconia nanoparticles in dispersion was studied. It was observed that the sol–gel prepared Ce-ZrO2 exhibited higher HA removal in practically neutral pH, achieving 93% efficiency in 180 min of adsorption in the dark followed by 180 min under visible-light irradiation using light-emitting diodes (LEDs). Changes in spectral properties and in total organic carbon confirmed HA degradation and contributed to the proposal of a mechanism for HA photodegradation. Finally, in HA filtration tests, Ce-ZrO2 photocatalytic membranes were able to recover the flux in a fouled membrane using visible-light by degrading HA. The present findings point to the further development of anti-fouling membranes, in which solar light can be used to degrade fouling compounds and possibly contaminants of emerging concern, which will have important environmental implications.

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