Synthesis and Luminescence Properties of 1,10-Phenanthroline Terbium/Polyvinyl Alcohol Hybrid Functional Materials

2010 ◽  
Vol 663-665 ◽  
pp. 316-319
Author(s):  
Hua Zhang ◽  
Lei Zhou
Keyword(s):  
Polyvinyl Alcohol ◽  
Hybrid Materials ◽  
Hybrid Material ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Sol Gel ◽  
Functional Materials ◽  
Hybrid Functional ◽  
Separation Processes ◽  
Ft Ir

A series of 1, 10-phenanthroline terbium/ polyvinyl alcohol hybrid materials with different coupling agent contents were prepared by sol-gel method. The morphology and photophysical properties were investigated. FT-IR was applied to characterize the structure of the obtained hybrid material, SEM and fluorescence spectra were applied to characterize the performance of the hybrid material. The result shows that the phase separation processes and the fluorescence quenching were avoided and the optical performance of hybrid materials were improved effectively.

Use of a sol-gel processed polyvinyl alcohol/inorganic silica hybrid material to improve the surface strength of recycled fiber sheets

TAPPI Journal ◽  
2011 ◽  
Vol 10 (1) ◽  
pp. 41-45 ◽  
Author(s):  
YI-DING SHEN ◽  
YAN-NA ZHAO ◽  
XIAO-RUI LI
Keyword(s):  
Polyvinyl Alcohol ◽  
Hybrid Material ◽  
Sol Gel ◽  
Strength Development ◽  
Chemical Bonds ◽  
Surface Strength ◽  
Oxidized Starch ◽  
Recycled Fiber ◽  
Ft Ir ◽  
Tearing Strength

We successfully composed a hybrid material that comprises organic polyvinyl alcohol (PVA) and inorganic silica (SiO2) through a sol–gel reaction with tetraethylorthosilicate (TEOS). The hybrid material was characterized using Fourier Transform Infrared (FT-IR). The chemical results indicated there were chemical bonds between SiO2 and PVA. The handsheet testing showed that folding strength, tensile strength, tearing strength, and picking velocity were increased by 22.3%, 35%, 26%, and 26%, respectively, when the hybrid material was used at a coat weight of 61 g/m2. In addition, strength development of the hybrid increases by using an oxidized starch at a 3:1 addition ratio.

scholarly journals New SiO2/Caffeic Acid Hybrid Materials: Synthesis, Spectroscopic Characterization, and Bioactivity

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 394 ◽  
Author(s):  
Michelina Catauro ◽  
Federico Barrino ◽  
Giovanni Dal Poggetto ◽  
Giuseppina Crescente ◽  
Simona Piccolella ◽  
...  
Keyword(s):  
Caffeic Acid ◽  
Hybrid Materials ◽  
Structural Changes ◽  
Sol Gel ◽  
Functional Materials ◽  
Spectroscopic Characterization ◽  
Silica Matrix ◽  
Materials Synthesis ◽  
Vis Spectroscopy ◽  
Ft Ir

The sol–gel route represents a valuable technique to obtain functional materials, in which organic and inorganic members are closely connected. Herein, four hybrid materials, containing caffeic acid entrapped in a silica matrix at 5, 10, 15, and 20 wt.%, were synthesized and characterized through Fourier-Transform Infrared (FT-IR) and Ultraviolet-Visible (UV–Vis) spectroscopy. FT-IR analysis was also performed to evaluate the ability to induce the hydroxyapatite nucleation. Despite some structural changes occurring on the phenol molecular skeleton, hybrid materials showed scavenging properties vs. 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and 2,2′-azinobis-(3-ethylbenzothiazolin-6-sulfonic acid) radical cation (ABTS•+), which was dependent on the tested dose and on the caffeic acid wt.%. The SiO2/caffeic acid materials are proposed as valuable antibacterial agents against Escherichia coli and Enterococcus faecalis.

Characterization and Thermal Properties of Sol-Gel Processed PMMA/SiO2 Hybrid Materials

2008 ◽  
Vol 55-57 ◽  
pp. 749-752
Author(s):  
A. Buasri ◽  
K. Liangraksa ◽  
T. Sirisom ◽  
N. Tangkachalakul
Keyword(s):  
Hybrid Materials ◽  
Hybrid Material ◽  
Sol Gel ◽  
Inorganic Materials ◽  
Pure Pmma ◽  
Interesting Phenomenon ◽  
Near Surface ◽  
Sem Image ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Hybrid organic-inorganic materials were fabricated using sol-gel technique using poly(methyl methacrylate) and methacrylic acid 3-(trimethoxysilyl)propyl ester (MAMSE) with 90/10, 80/20 and 70/30 (%w/w) ratios with tetrahydrofuran (THF) solvent. The thin films were then characterized using FTIR spectra, SEM, DSC and TGA thermograms. From the preliminary characterization, the hybrid material was found to have nano and ultra scale tight pore ranges. FT-IR spectroscopy uncovered all the signature peaks characteristic of silicate structures in the near-surface regions. Fingerprints of Si-O-Si groups in cyclic and linear molecular substructures are present. The SEM image clearly shows that hybrid materials have homogenous and smooth surface. DSC analysis of the material shows interesting phenomenon regarding glass transition temperature (Tg). The hybrid material was found to have higher Tg than pure PMMA. From TGA analysis, the hybrid materials were observed to have higher thermal stability than pure PMMA.

scholarly journals New SiO2/Caffeic Acid Hybrid Materials: Synthesis, Spectroscopic Characterization and Bioactivity

2019 ◽  
Author(s):  
Michelina Catauro ◽  
Federico Barrino ◽  
Giovanni Dal Poggetto ◽  
Giuseppina Crescente ◽  
Simona Piccolella ◽  
...  
Keyword(s):  
Caffeic Acid ◽  
Hybrid Materials ◽  
Structural Changes ◽  
Sol Gel ◽  
Functional Materials ◽  
Spectroscopic Characterization ◽  
Silica Matrix ◽  
Materials Synthesis ◽  
Vis Spectroscopy ◽  
Ft Ir

Sol-gel route represents a valuable technique to obtain functional materials, in which organic and inorganic members are closely connected. Herein four hybrid materials, containing caffeic acid entrapped in a silica matrix at 5, 10, 15 and 20 wt%, were synthesized and characterized through FT-IR and UV-Vis spectroscopy. FT-IR analysis was also performed to evaluate the ability to induce the hydroxyapatite nucleation. Despite some structural changes occurred on the phenol molecular skeleton, hybrid materials showed scavenging properties vs DPPH and ABTS+ radicals, which was dependent on the tested dose and on the caffeic acid wt%. Finally, the SiO2/caffeic acid materials have been proposed as valuable antibacterial agents against Escherichia coli and Enterococcus faecalis.

scholarly journals Hybrid material by anchoring a ruthenium(ii) imine complex to SiO2: preparation, characterization and DFT studies

RSC Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 6221-6233
Author(s):  
G. Eliad Benitez-Medina ◽  
Raúl Flores ◽  
Luis Vargas ◽  
Fernando Cuenú ◽  
Pankaj Sharma ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Hybrid Material ◽  
Dft Studies ◽  
Ft Ir ◽  
Silica Hybrid

Ruthenium–silica hybrid materials were synthesized. The process was tracked by FT-IR, DRS-UV-Vis, DFT and deconvolution analyses, finding experimental–theoretical correlation.

Effect of Surfactants on Stability of Colloidal Sols as Precursors in Sol-Gel Encapsulation

2009 ◽  
Vol 415 ◽  
pp. 57-60 ◽  
Author(s):  
Ioana Lacatusu ◽  
Nicoleta Maria Badea ◽  
Aurelia Meghea
Keyword(s):  
Sol Gel ◽  
Functional Materials ◽  
Flavonoid Compound ◽  
Quaternary Salts ◽  
Bioactive Properties ◽  
Nir Fluorescence ◽  
Scattering Measurements ◽  
Ft Ir ◽  
Preparation Route ◽  
Gel Preparation

This paper aims to study the effect of three alkyl quaternary salts on stability of colloidal sols further used as water-insoluble oligomers for encapsulation of an active flavonoid compound – quercitin. The preparation procedure is described and practical remarks on silica-based sol-gels are included. It is also demonstrated how to exploit the sol-gel preparation route in order to improve the thermal resistance of quercitin and to increase an optical function - fluorescence. The evolution in time of competitive hydrolysis and condensation processes has been observed by dynamic light scattering measurements. The sol-gel materials with entrapped quercitin molecule have been characterised by spectral methods (FT-IR, UV-VIS-NIR), fluorescence and by thermal analysis as well. Sol-gel materials doped with active flavonoid compound may be used in preparation of some functional materials with bioactive properties.

Development of Permeable Reactive Barrier for Phosphorus Removal

2010 ◽  
Vol 636-637 ◽  
pp. 1365-1370 ◽  
Author(s):  
M. Oliveira ◽  
Ana Vera Machado ◽  
Regina Nogueira
Keyword(s):  
Hybrid Material ◽  
Phosphorus Removal ◽  
Sol Gel ◽  
Permeable Reactive Barriers ◽  
Permeable Reactive Barrier ◽  
Aluminium Isopropoxide ◽  
Reactive Barrier ◽  
Ft Ir ◽  
Flow Through ◽  
Ft Ir Spectroscopy

Permeable reactive barriers were developed for phosphorus removal. The barrier consists in an organic-inorganic hybrid material, which allows water and others species to flow through it, while selectively removes the contaminants. Polyethylene oxide (POE) and aluminium oxide (Al2O3) were used as the organic and the inorganic parts, respectively. The hybrid material was obtained by sol-gel reaction, using aluminium isopropoxide as inorganic percursor in order to attain Al2O3. The hybrid material produced was characterized by FT-IR spectroscopy and thermogravimetry. The previous tests for phosphorus removal have shown the effectiveness capacity of the developed material to remove it.

Optical Properties of ATO Sol-gel Coated Carbon Fibers

2012 ◽  
Vol 1454 ◽  
pp. 221-226
Author(s):  
Brandon Richard ◽  
Norma Alcantar ◽  
Andrew Hoff ◽  
Sylvia Thomas
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Carbon Fibers ◽  
Sol Gel ◽  
Functional Materials ◽  
Additional Material ◽  
Heat Treated ◽  
Ft Ir ◽  
Recent Trends ◽  
Thermal Infrared Radiation

ABSTRACTRecent trends in composite research include the development of structural materials with multiple functionalities. In new studies, novel materials are being designed, developed, modified, and implemented into composite designs. Typically, an increase in functionality requires additional material phases within one system. The presence of excessive phases can result in deterioration of individual or overall properties. True multi-functional materials must maintain all properties at or above the minimum operating limit. In this project, samples of Sb-doped SnO2(ATO) sol-gel solutions are used to coat carbon fibers and are heat treated at a temperature range of 200 – 500 °C. Results from this research are used to model the implementation of sol-gel coatings into carbon fiber reinforced multifunctional composite systems. This research presents a novel thermo-responsive sol-gel/ (dopant) combination and evaluation of the actuating responses due to various heat treatment temperatures. While ATO is a well-known transparent conductive material, the implementation of ATO on carbon fibers for infrared thermal reflectivity has not been examined. These coatings serve as actuators capable of reflecting thermal infrared radiation in mid-range and near-range wavelengths (λ). By altering the ATO sol gel thickness and heat treatment temperatures, optimal optical properties are obtained. While scanning electron microscopy (SEM) is used for imaging, electron diffraction spectroscopy (EDS) is used to verify the compounds present in the coatings. Fourier transform infrared (FT-IR) spectroscopy was performed to analyze the reflectivity in the infrared spectra and analyze the crystal structures after heat treatments.

Fabrication of transparent polymer-inorganic hybrid material

2005 ◽  
Vol 876 ◽  
Author(s):  
S. Li ◽  
M. S. Toprak ◽  
Y. S Jo ◽  
D. K. Kim ◽  
M. Muhammed
Keyword(s):  
Hybrid Materials ◽  
Hybrid Material ◽  
Zinc Acetate ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Shielding Effect ◽  
Complexing Agent ◽  
Inorganic Hybrid ◽  
Zinc Compound

AbstractPolymer-inorganic hybrid materials composed of polymethyl methacrylate (PMMA) and zinc compounds were prepared by sol-gel in-situ transition polymerization of zinc complex in PMMA matrix. Zinc acetate dihydrate dissolved in ethanol was used as the inorganic precursor. Monoethanolamine (MEA) acted as a complexing agent to control the hydrolysis of zinc acetate to produce a zinc compound network, and then PMMA, formed in-situ through a radical polymerization, were chemically bonded to the forming zinc compound network to realize a hybrid material. Transparent homogenous hybrid materials with slight colours from pink to yellow were fabricated by varying the composition. TEM, FT-IR were employed to investigate structural and physical properties. The UV-shielding effect was evaluated by UV-VIS. The low content of zinc (around 0.02 wt%) and the fine particle size rendered it visibly transparent and capable of greatly attenuating UV radiation in the full UV range.

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