Synthesis Of New Hybrid Materials Research Articles

Synthesis of New Hybrid Materials of SiO2@Melamine-Cyanurate as Precursors for Graphite-Like Carbon Nitride

Synthesis of New Hybrid Materials of SiO2@Melamine-Cyanurate as Precursors for Graphite-Like Carbon Nitride

Carbon Nanoparticles Entrappedtriclinic Iron Vanadate: A Promising Material for the Synthesis of Diformylfuran.

AbstractDeveloping sustainable, inexpensive material has been proposed as a promising catalyst. Herein, we report the synthesis of new hybrid material composed of carbon nanoparticles entrapped in iron vanadate. Thus obtained new material was characterized using SEM, PXRD, Raman and XPS.The catalytic potentiality of CNP/FeVO4has been tested in the oxidation of biomass derived hydroxymethylfurfural (HMF) in an aqueous medium. An enhanced conversion of 5‐HMF to diformylfuran (DFF) is observed in the presence of CNP/FeVO4than FeVO4alone. The absence of expensive metals and using only water as a solvent, along with recyclability of catalyst make our catalytic method green and attractive.

Optical, UV-Vis spectroscopy studies, electrical and dielectric properties of transition metal-based of the novel organic–inorganic hybrid (C6H10N2)(Hg2Cl5)2.3H2O

In this work, we are interested in the synthesis of new hybrid material (C6[Formula: see text]N2)(Hg2[Formula: see text].3H2O grown by hydrothermal methods. X-ray diffraction indicates that this compound crystallizes at 150(2) K in the monoclinic system with [Formula: see text]/[Formula: see text] space group, with the following unit cell parameters: [Formula: see text](15) Å, [Formula: see text](15) Å, [Formula: see text](6) Å, [Formula: see text] and [Formula: see text]. On the other hand, the optical properties of this compound were studied using ultraviolet-visible (UV-Vis) spectroscopy in the range 200–800[Formula: see text]nm. Furthermore, the optical absorbances are used to determine the absorption coefficient [Formula: see text] and the optical band gap [Formula: see text], so the Tauc model was used to determine the optical gap energy of the compound (C6[Formula: see text]N2)(Hg2[Formula: see text].3H2O. The analysis of the results revealed the existence of optical allowed indirect transition mechanisms with the band gap energy equal to (2.37[Formula: see text]eV) for liquid and (4.33[Formula: see text]eV) for solid. Impedance measurements indicate that the electrical and dielectric properties are strongly dependent on both temperature and frequency. Nyquist plots ([Formula: see text] versus [Formula: see text]) show that the conductivity behavior is accurately represented by an equivalent circuit model which consists of a series combination of bulk and grain boundary. Furthermore, the angular frequency dependence plots of the real and imaginary parts, [Formula: see text] and [Formula: see text], of complex dielectric permittivity [Formula: see text] and tan [Formula: see text] losses at several temperatures between 303 and 453[Formula: see text]K were studied for the title compound. Finally, the modulus plots can be characterized by the presence of two relaxation peaks.

Inorganic-organic thin implant coatings deposited by lasers.

The lifetime of bone implants inside the human body is directly related to their osseointegration. Ideally, future materials should be inspired by human tissues and provide the material structure-function relationship from which synthetic advanced biomimetic materials capable of replacing, repairing, or regenerating human tissues can be produced. This work describes the development of biomimetic thin coatings on titanium implants to improve implant osseointegration. The assembly of an inorganic-organic biomimetic structure by UV laser pulses is reported. The structure consists of a hydroxyapatite (HA) film grown onto a titanium substrate by pulsed-laser deposition (PLD) and activated by a top fibronectin (FN) coating deposited by matrix-assisted pulsed laser evaporation (MAPLE). A pulsed KrF* laser source (λ = 248 nm, τ = 25 ns) was employed at fluences of 7 and 0.7J/cm(2) for HA and FN transfer, respectively. Films approximately 1500 and 450 nm thick were obtained for HA and FN, respectively. A new cryogenic temperature-programmed desorption mass spectrometry analysis method was employed to accurately measure the quantity of immobilized protein. We determined that less than 7 μg FN per cm(2) HA surface is adequate to improve adhesion, spreading, and differentiation of osteoprogenitor cells. We believe that the proposed fabrication method opens the door to combining and immobilizing two or more inorganic and organic materials on a solid substrate in a well-defined manner. The flexibility of this method enables the synthesis of new hybrid materials by simply tailoring the irradiation conditions according to the thermo-physical properties of the starting materials.

Kinetics and thermodynamics of Cr(VI) ion adsorption onto organo-bentonite from the Amazon region

A natural bentonite clay sample from the Amazon region (Amazonas State) was utilized for the synthesis of new hybrid materials (organo-bentonite) produced by the organofunctionalization process. The organo-bentonite types were composed of an Amazon bentonite sample, 3-aminopropyltrietoxisilane and 3,2-aminoethylaminopropyltrimetoxisilane. The natural bentonite and organo-bentonite samples were used in batch studies for the adsorption of Cr(VI) ions from aqueous solution. The adsorption data were fitted to equilibrium and kinetic models. The effects of stirring time, adsorbent dosage and pH on the adsorption capacity demonstrated that 90 min is sufficient to reach equilibrium at room temperature and over a pH range of 6.0–8.0, the batch results were confirmed by column method and show that the adsorption process of materials accorded with Redlich–Peterson, Sips, and Langmuir isotherm models. The exothermic enthalpic values reflected a favorable energetic process for chromium ions anchored in the material surfaces. The negative Gibbs free energy results supported the spontaneity of three adsorption reactions with Cr(VI) ions. The model of Adams–Bohart was used to analyze the adsorption experimental data and the model parameters were evaluated.

Synthesis of new hybrid material based on copolymer and Pd-nanoparticles.

ABSTRACTIn this work, the synthesis of new hybrid material based on a poly (buthyl acrylate –co- vinyl formamide) copolymer using the emulsion polymerization and doped with Pd, is discussed. The copolymer structure was confirmed by FT-IR. Afterwards, Pd nanocrystals previously synthesized, resulting on a spherical shape of ~ 5 nm, as measured by High-resolution transmission electron microscopy (HR-TEM), were deposited on the structure of the organic material. The films were analyzed using AFM and Scanning electron microscopy (SEM), giving rise to a hybrid material that could be applied in areas such as nanolithography, catalysis, and sensors.

Photoluminescence as Complementary Evidence for Short-Range Order in Ionic Silica Nanoparticle Networks

Recently we published the synthesis of new hybrid materials, ionic silica nanoparticles networks (ISNN), made of silica nanoparticles covalently connected by organic bridging ligands containing imidazolium units owing to a “click-chemistry-like” reaction. Among other techniques small-angle X-ray scattering (SAXS) experiments were carried out to get a better picture of the network extension. It turned out that the short-range order in ISNN materials was strongly influenced by the rigidity of the bridging ligand, while the position of the short-range order peaks confirmed the successful linking of the bridging ligands. The photoluminescence experiments reported in this communication revealed strongly enhanced emission in the hybrid material in comparison with neat imidazolium salts. Moreover the shift of the emission maximum toward longer wavelengths, obtained when varying the aromatic ring content of the bridging ligand, suggested the existence of strong π−π stacking in the hybrid material. Experiments revealed a stronger luminescence in those samples exhibiting the higher extent of short-range order in SAXS.

Hydroxylated Cyclophosphazene/Silica Hybrid Materials: Synthesis and Characterization

The synthesis of new hybrid materials that are prepared by the sol-gel technique is presented. The synthesis involves the reaction of a free hydroxylic group-containing cyclophosphazene, hexakis(4-hydroxyphenoxy)cyclophosphazene, and a hydrolyzed tetraethoxysilane under acid catalysis. Evidence for the formation of genuine chemical bonds between the hydroxylated cyclophosphazene and the three-dimensional silica network is presented. The formation of these bonds was confirmed by spectroscopic techniques (FTIR, 31 P, 29 Si, and 13 C NMR both in solution and in the solid state and X-Ray Diffraction analysis). The results are supported by thermal characterization of the materials based on Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) determinations.

Synthesis of New Hybrid Materials by Intercalation of a Bifunctional Aminophosphane and Its Tungsten Pentacarbonyl Complex in α‐Zirconium Phosphate

Functionalization of a phosphane ligand facilitates intercalation of the free ligand and its tungsten pentacarbonyl complex (example shown bottom right) in α-zirconium phosphate (section of structure shown bottom left). Syntheses of intercalated products with the stoichiometry [Zr(HPO4)2(Q)x·yH2O] (Q = Ph2PCH2CH2NMe2, x = 0.46, y = 1.1; Q = (OC)5W(Ph2PCH2CH2NMe2), x = 0.51, y = 1.5) are reported.