A facile method for fabrication of titanium-doped hybrid materials with high refractive index

This paper presents a facile route to prepare a series of high refractive index and homogeneous hybrid resins with titanium in the backbone by a non-hydrolytic sol–gel process.

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In situ Synthesis of High Refractive Index PDMS/Metal Oxide Nanocomposites

MRS Proceedings ◽

10.1557/opl.2012.17 ◽

2012 ◽

Vol 1400 ◽

Cited By ~ 2

Author(s):

Qiaoyu Lu ◽

Michael E. Mullins

Keyword(s):

Refractive Index ◽

Metal Oxide ◽

Hybrid Materials ◽

Sol Gel ◽

Heat Stability ◽

Ceramic Materials ◽

High Refractive Index ◽

Oxide Content ◽

Metal Alkoxides ◽

Silicone Polymers

ABSTRACTOrganic-inorganic hybrids have been prepared with tailorable and enhanced properties which are unachievable using polymers or ceramics alone. By combining the flexibility of polymers with the electronic and optical properties of ceramic materials, these hybrids offer great potential for many optical, electrical and mechanical applications. Silicone polymers because of their desirable surface properties, excellent physical properties, heat stability, and high resistance to chemical and UV attack, have been widely used. Hybrid siloxane-metal oxide gels have been prepared via sol-gel techniques, by using hydroxyl-terminated polydimethylsiloxanes (PDMS) crosslinked by metallic alkoxides, M(OR)n. In this technique, the use of organic solvents permits organic and inorganic components to be combined at a molecular level with the desired composition. By varying the type and percentage of metal alkoxides during synthesis, transparent and homogeneous organic-inorganic hybrid materials with unique properties were obtained. Also a secondary metal oxide species was introduced to synthesize binary metal oxide-PDMS hybrids. Systematic experiments were carried out to study the effect of the reaction conditions and metal alkoxides-PDMS ratios on the properties of the final hybrids. These hybrids were spin coating on silicon wafers or molded into bulk films to be tested. The composition and the properties of the transparent inorganic-organic hybrids were investigated and characterized by ellipsometer and Fourier Transform Infrared (FTIR) spectroscopy. Experimental results showed that the refractive index of the hybrid materials exhibits a proportional relationship with the metal oxide content, the higher the metal oxide content the higher the refractive index. The refractive index was increased from 1.4 of PDMS to 1.7 of metal oxide-PDMS hybrid with highest prepared metal oxide loading. From the FTIR spectra, the structures of the hybrids for various metal oxide-PDMS compositions were examined.

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Near-infrared high refractive-index three-dimensional inverse woodpile photonic crystals generated by a sol-gel process

Journal of Applied Physics ◽

10.1063/1.2803714 ◽

2007 ◽

Vol 102 (9) ◽

pp. 096102 ◽

Cited By ~ 13

Author(s):

Baohua Jia ◽

Shuhui Wu ◽

Jiafang Li ◽

Min Gu

Keyword(s):

Refractive Index ◽

Photonic Crystals ◽

Near Infrared ◽

Sol Gel ◽

Three Dimensional ◽

High Refractive Index ◽

Sol Gel Process

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Anti-reflection and anti-static (AR/AS) coatings made by TiO2 sol-gel process with poly(3,4-ethylenedioxy thiophene)

e-Polymers ◽

10.1515/epoly.2008.8.1.89 ◽

2008 ◽

Vol 8 (1) ◽

Author(s):

Won Jung Kim ◽

Tae Young Kim ◽

Chin Su Park ◽

Jong Eun Kim ◽

Tae Hee Lee ◽

...

Keyword(s):

Refractive Index ◽

Sol Gel ◽

Nir Spectroscopy ◽

High Refractive Index ◽

Conducting Layer ◽

Uv Curable ◽

Sol Gel Process ◽

Refractive Index Layer ◽

Poly Ethylene ◽

Low Refractive Index

AbstractIn this study, we designed a two-layer hybrid Anti-Reflection/Anti-Static (AR/AS) thin film. Two kinds of UV-curable fluorinated compounds were synthesized as low refractive index materials, and a TiO2 sol combined with a conducting polymer, poly(3,4-ethylenedioxythiophene) was made by the sol-gel process for use as a high refractive index material as well as a conducting layer. In order to determine the most optimized AR/AS system, the spectral properties were simulated with the refractive index of each layer. According to the simulated results, a high refractive index layer was deposited on the hard coated poly(ethylene terephthalate) (PET) substrate by the spin coating technique, and a low refractive index layer was spin coated on the low refractive index layer. The reflectance and transmittance were measured by UV-VIS-NIR spectroscopy. It was found that the measured reflectance and the maximum transmittance of the AR/AS film were 0.71 %R at a wavelength of 550 nm and 93 %T in the wavelength range between 400 and 700 nm, respectively. The surface resistance of the AR/AS film was 108.6 ohms.

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New high-refractive-index organic/inorganic hybrid materials from sol-gel processing

Macromolecules ◽

10.1021/ma00011a063 ◽

1991 ◽

Vol 24 (11) ◽

pp. 3449-3450 ◽

Cited By ~ 136

Author(s):

B. Wang ◽

G. L. Wilkes ◽

J. C. Hedrick ◽

S. C. Liptak ◽

J. E. McGrath

Keyword(s):

Refractive Index ◽

Hybrid Materials ◽

Sol Gel ◽

High Refractive Index ◽

Inorganic Hybrid ◽

Gel Processing

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UV Curable Organic-Inorganic Hybrid Materials

MRS Proceedings ◽

10.1557/proc-628-cc6.14 ◽

2000 ◽

Vol 628 ◽

Cited By ~ 1

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‥

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

High Performance Polymers ◽

10.1088/0954-0083/6/1/005 ◽

1994 ◽

Vol 6 (1) ◽

pp. 43-52 ◽

Cited By ~ 24

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.

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

Dalton Transactions ◽

10.1039/c7dt03902f ◽

2018 ◽

Vol 47 (9) ◽

pp. 2925-2932 ◽

Cited By ~ 4

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.

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

Journal of Carbohydrate Chemistry ◽

10.1080/07328303.2019.1663205 ◽

2019 ◽

Vol 38 (9) ◽

pp. 586-597 ◽

Cited By ~ 2

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.

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