Temperature and Oxygen Sensing Properties of Ru(II) Covalently-Grafted Sol–Gel Derived Ormosil Hybrid Materials

2016 ◽  
Vol 16 (4) ◽  
pp. 4023-4028 ◽  
Author(s):  
Haoran Zhang ◽  
Bingfu Lei ◽  
Hanwu Dong ◽  
Yingliang Liu ◽  
Mingtao Zheng ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Thermal Activation ◽  
Sol Gel ◽  
Oxygen Quenching ◽  
Temperature Quenching ◽  
Excited State Lifetime ◽  
Network Modifier ◽  
The Matrix ◽  
Ft Ir ◽  
Sensing Sensitivity

In this article, oxygen and temperature-sensing hybrid materials consisting of [Ru(Phen)3]2+ portions covalently-grafted onto the sol–gel derived ormosil network were prepared by co-condensation of tetraethoxysilane (TEOS) using n-octyltriethoxysilane as the network modifier. For comparison purposes, the hybrid materials in which [Ru(Phen)3]2+ were conventionally physically-incorporated into the matrix were also prepared. The obtained hybrid materials were characterized by Fourier transform infrared (FT-IR), luminescence intensity oxygen quenching Stern-Volmer plots, temperature quenching plots and excited-state lifetime. The near linear Stern-Volmer plots can be attributed to the approximate heterogeneous environment of the luminophore within the ormosil materials. The results reveal that the covalently-grafted sample is more sensitive to O2, and has a higher sensing sensitivity and a higher thermal activation energy compared to the physically-incorporated one, since these Ru(II) molecules are strongly covalently-grafted onto the Si–O network via the CH2–Si bonds and less –OH group.

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.

Synthesis and Characterization of Siloxane-Polyurethane Hybrid Materials

2008 ◽  
Vol 396-398 ◽  
pp. 481-484
Author(s):  
Rodrigo Jiménez-Gallegos ◽  
L. Téllez-Jurado ◽  
Luis M. Rodríguez-Lorenzo ◽  
Julio San Román
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Proton Nuclear Magnetic Resonance ◽  
X Ray Diffraction ◽  
Organic Part ◽  
Sol Gel Process ◽  
Nmr Techniques ◽  
Ft Ir ◽  
Characterization Of Materials

This paper focuses on the preparation of siloxane-polyurethane hybrid materials using a sol-gel method. The global aim of the project is to tailor mechanical properties, degradability rate, bioactivity and biocompatibility to design scaffolds for musculoskeletal applications. A series of seven hybrid materials were synthesized with varying the proportion of polydimethylsiloxane (PDMS), and Polyurethane (PU). The organic part ratios (by weight) employed were (% PDMS:% PU) 30:0, 35:5, 20:10, 15:15, 10:20, 5:25, and 0:30. The organic part was reacted with constant 70 % TEOS to obtain the hybrid materials. A sol-gel process was selected for the synthesis of the hybrids. The characterization of materials was carried out by the fourier-infrared spectroscopy (FT-IR), x-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electronic microscopy (SEM) and proton nuclear magnetic resonance (1H-NMR) techniques in order to analyze the structure, microstructure and chemical composition of the hybrid materials. Gelification time depends on the proportion of PU used. When no PU is employed, the gel time is 8 hours but it rises up to 18 days for 30 % of polyurethane. Materials range from opaque to translucent but with a greater fragility for greater amounts of polyurethane. No differences in the bonding of materials could be appreciated.

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.

scholarly journals Preparation of TiO2@ZIF-8 for the removal of As(III) in water

2017 ◽  
Vol 17 (6) ◽  
pp. 1730-1739 ◽  
Author(s):  
Guangpeng Li ◽  
Hui Jiang ◽  
Dan Li ◽  
Tianyu Liao ◽  
Lingling Yuan ◽  
...  
Keyword(s):  
Uv Light ◽  
Removal Rate ◽  
Sol Gel ◽  
Illumination Condition ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Uv Light Irradiation ◽  
The Matrix ◽  
Ft Ir ◽  
The Stability

Abstract To remove As(III) in water, the composite material of TiO2@ZIF-8 was prepared by a sol-gel method with zeolitic imidazolate framework-8 (ZIF-8) as the matrix. The structure of TiO2@ZIF-8 was characterized with scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The results indicated that the best loading efficiency of TiO2 on ZIF-8 occurred when it was calcined at 300 °C for 3 h. This material was used to remove As(III) from aqueous solution, and the effect of the initial concentration of As(III), pH, and the illumination condition on the removal of As(III) was investigated. The results showed that the removal rate of As(III) was as high as 100% under a pH of 4–7, an initial As(III) concentration of less than 2 mg/L, and UV-light irradiation for 2 h. The repeated experiments were also performed for the investigation of the stability of TiO2@ZIF-8.

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.

Hybrid materials for Optical Limiting

2004 ◽  
Vol 847 ◽  
Author(s):  
Marcus Örtenblad ◽  
Stephane Parola ◽  
Frédéric Chaput ◽  
Cédric Desroches ◽  
Catherine Sigala ◽  
...  
Keyword(s):  
Solid State ◽  
Hybrid Materials ◽  
Molecular Species ◽  
Sol Gel ◽  
Wavelength Region ◽  
Optical Limiting ◽  
Sol Gel Process ◽  
The Matrix ◽  
Matrix Class ◽  
The Stability

ABSTRACTMaterials based on alkynyl platinum derivatives and thiacalixarenes were prepared through the sol-gel process The molecular species were grafted to the matrix (class II hybrid) in order to maximise the concentration and the stability of the final solid-state material Broadband optical limiting performance in the visible wavelength region was observed in the prepared materials Thermomechanical characterisation of the matrix is also discussed.

scholarly journals FT-IR Characterization of Antimicrobial Hybrid Materials through Sol-Gel Synthesis

2020 ◽  
Vol 10 (3) ◽  
pp. 1180 ◽  
Author(s):  
Michelina Catauro ◽  
Simona Piccolella ◽  
Cristina Leonelli
Keyword(s):  
Hydrogen Bonds ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Titanium Butoxide ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ft Ir ◽  
Escherichia Coli Bacteria ◽  
Sol Gel Synthesis

Silica/polycaprolactone and titania/polycaprolactone hybrid organic/inorganic amorphous composites were prepared via a sol-gel method starting from a multi-element solution containing tetramethyl orthosilicate (TMOS) or titanium butoxide (TBT), polycaprolactone (PCL), water and methylethylketone (MEK). The molecular structure of the crosslinked network was based on the presence of the hydrogen bonds between organic/inorganic elements as confirmed by Fourier Transform Infra-Red (FT-IR) analysis. In particular, the structure of crosslinked network was realized by hydrogen bonds between the X-OH (X = Si or Ti) group (H donator) in the sol-gel intermediate species and ester groups (H-acceptors) in the repeating units of the polymer. The morphology of the hybrid materials; pore size distribution, elemental homogeneity and surface features, was studied by scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) and by atomic force microscopy (AFM). The bioactivity of the synthesized hybrid materials was confirmed by observing the formation of a layer of hydroxyapatite (HAP) on the surface of the samples soaked in a simulated body fluid. The antimicrobial behavior of synthetized hybrids was also assessed against Escherichia coli bacteria. In conclusion, the prepared hybrid materials are proposed for use as future bone implants.

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.

Spectroscopic and Thermal Studies of Polyalkoxysilanes and Silica-Chitosan Hybrid Materials

2015 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Antonio Sanchez-Fernandez ◽  
Laura Pena-Paras ◽  
Elisa M. Mendoza ◽  
Alejandra Leyva ◽  
Luis A. Bautista ◽  
...  
Keyword(s):  
Solid State ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Thermal Studies ◽  
13C Nmr Spectroscopy ◽  
Differential Scanning Calorimetric ◽  
Reaction Products ◽  
Natural Polymers ◽  
Sol Gel Process ◽  
Ft Ir

Polymers of organoalkoxysilanes (or polyalkoxysilanes) were synthesized through sol-gel process using different organosilanes: Tetraethylorthosilicate (TEOS), (3-Glycidyloxypropyl) trimethoxysilane (GPTMS), Trimethoxy(propyl)silane (TMPS), and/or Triethoxy(octyl)silane (EOS). Different carboxylic acids (acetic, formic, and citric) were used to prepare polyalkoxysilanes, with citric acid acting as a reactant rather than a catalyst for the sol-gel reaction. Silica-chitosan hybrid materials were synthesized reacting polyalkoxysilanes and chitosan, one of the most important and most studied natural polymers, through sol-gel process. The synthesized materials were characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetrical analysis (TGA), differential Scanning Calorimetric (DSC) and solid-state Carbon-13 Nuclear Magnetic Resonance (solid-state   13C-NMR) spectroscopy, obtaining information on the structural properties of each modified materials. The results obtained by NMR indicate that the oxirane group of GPTMS remains in all reaction products to form different polyalkoxysilanes.

Synthesis and Characterization of SAR/SiO2 Hybrid Materials with High Thermal Stability

2011 ◽  
Vol 211-212 ◽  
pp. 571-575
Author(s):  
Jian Zhang ◽  
Jia Liu ◽  
Can Feng Wang ◽  
Fa Rong Huang ◽  
Lei Du
Keyword(s):  
Thermal Stability ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Terminal Group ◽  
High Thermal Stability ◽  
High Yield ◽  
Synthesis And Characterization ◽  
Curing Process ◽  
Ft Ir

A silicon-containing arylacetylene resin, poly[(dimethylsilyl)eneethynylene phenyleneethynylene] with methoxy silyl terminal group (abbreviated MSAR) was synthesized. The resin and tetraethoxysilane (abbreviated TEOS) were used to prepare silicon-containing arylacetylene resin (abbreviated SAR) /SiO2 hybrid materials by a sol-gel method. Both the curing process of the xerogel and thermal properties of the hybrid materials were studied by FT-IR, DSC and TGA. The thermogravimetric analysis of the hybrid materials showed that Td5 (temperature of 5% weight loss) was 696°C and char yield was 92.1% at 800°C in nitrogen. A Si-C-O ceramic residue was obtained in high yield(86.8%) by sintering up to 1450°C in nitrogen.

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