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 Sol-gel synthesis and study of neodymium substitution effects in Co-Al-Nd-O system with possible applications as novel inorganic pigments

2012 ◽  
Vol 10 (5) ◽  
pp. 1574-1583 ◽  
Author(s):  
Dalia Jonynaite ◽  
Darius Jasaitis ◽  
Rimantas Raudonis ◽  
Algirdas Selskis ◽  
Remigijus Juskenas ◽  
...  
Keyword(s):  
Sol Gel ◽  
Substitution Effects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Sol Gel Process ◽  
New Compounds ◽  
Sol Gel Synthesis

AbstractIn the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.

Infrared Characterization of PMMA-SiO2 Hybrid Glasses Obtained by Sol-Gel Process

2010 ◽  
Vol 1278 ◽  
Author(s):  
L.L. Díaz-Flores ◽  
A. S. López Rodríguez ◽  
P. SifuentesGallardo ◽  
M.A. Hernàndez Rivera ◽  
M.a Garnica Romo ◽  
...  
Keyword(s):  
Sol Gel ◽  
Chemical Properties ◽  
Hybrid Coatings ◽  
Force Microscopy ◽  
Air Atmosphere ◽  
Atomic Force ◽  
Sol Gel Process ◽  
Traditional Process ◽  
And Chemical Properties

AbstractThis work is about the production of hybrid coatings of the system SiO2-PMMA (PMMA, polymethylmethacrylate). These materials have interesting mechanical and chemical properties useful for anticorrosive and wear resistance applications. SiO2-PMMA hybrids were obtained by the sol-gel traditional process, using tetraethylorthosilicate (TEOS) and methylmethacrylate (MMA) by Aldrich Co, as starting reagents. The SiO2:PMMA ratio was varied from 0:1 to about 1:1 at air atmosphere deposition. The coatings were obtained on acrylic sheets and silicon wafers. A diversity of coatings with chemical composition ranging from SiO2 and PMMA to obtain the SiO2-PMMA hybrids were obtained. Infrared (IR) and atomic force microscopy (AFM), were performed to determinate structural and morphological behavior.

Structural and Optical Characterization of Synthesized TiO2 Nanopowder Using Sol–Gel Technique

2016 ◽  
Vol 15 (01n02) ◽  
pp. 1650002 ◽  
Author(s):  
S. Lourduraj ◽  
R. Victor Williams
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Visible Spectrum ◽  
Average Crystallite Size ◽  
Xrd Analysis ◽  
Force Microscopy ◽  
Morphological Studies ◽  
Atomic Force ◽  
Gel Technique

The nanocrystalline TiO2 powder was synthesized by sol–gel method. The XRD analysis reveals that TiO2 powder was highly crystalline (anatase phase) and nanostructured with tetragonal system. The average crystallite size after calcined at 673[Formula: see text]K is found to be 7.7[Formula: see text]nm. The surface morphological studies using scanning electron microscopy (SEM) exhibit that the formation of nanosized TiO2 particles with less densification nature. Atomic force microscopy (AFM) topography exhibits the uniform distribution of spherical-shaped particles. The energy dispersive X-ray spectroscopy (EDX) confirms the presence of Titanium and Oxygen in synthesized TiO2 nanopowder. The value of optical bandgap of TiO2 nanopowder calculated from UV-Visible spectrum is 3.45[Formula: see text]eV. The presence of TiO2 particles is confirmed from the dominant fourier transform infrared (FTIR) peaks at 621[Formula: see text]cm[Formula: see text] and 412[Formula: see text]cm[Formula: see text].

scholarly journals Synthesis and Characterization of PLA-Micro-structured Hydroxyapatite Composite Films

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 274 ◽  
Author(s):  
Andreea Madalina Pandele ◽  
Andreea Constantinescu ◽  
Ionut Cristian Radu ◽  
Florin Miculescu ◽  
Stefan Ioan Voicu ◽  
...  
Keyword(s):  
Composite Films ◽  
Synthesis Method ◽  
Polymer Chains ◽  
Force Microscopy ◽  
Degradation Temperature ◽  
Atomic Force ◽  
Hydroxyapatite Composite ◽  
Ft Ir ◽  
Ir And Raman

This article presents a facile synthesis method used to obtain new composite films based on polylactic acid and micro-structured hydroxyapatite particles. The composite films were synthesized starting from a polymeric solution in chloroform (12 wt.%) in which various concentrations of hydroxyapatite (1, 2, and 4 wt.% related to polymer) were homogenously dispersed using ultrasonication followed by solvent evaporation. The synthesized composite films were morphologically (through SEM and atomic force microscopy (AFM)) and structurally (through FT-IR and Raman spectroscopy) characterized. The thermal behavior of the composite films was also determined. The SEM and AFM analyses showed the presence of micro-structured hydroxyapatite particles in the film’s structure, as well as changes in the surface morphology. There was a significant decrease in the crystallinity of the composite films compared to the pure polymer, this being explained by a decrease in the arrangement of the polymer chains and a concurrent increase in the degree of their clutter. The presence of hydroxyapatite crystals did not have a significant influence on the degradation temperature of the composite film.

scholarly journals Cellulose-Cyclodextrin Co-Polymer for the Removal of Cyanotoxins on Water Sources

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2075
Author(s):  
Diego Gomez-Maldonado ◽  
Iris Beatriz Vega Erramuspe ◽  
Ilari Filpponen ◽  
Leena-Sisko Johansson ◽  
Salvatore Lombardo ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Cellulose Nanofibrils ◽  
Human Consumption ◽  
Nutrient Runoff ◽  
Force Microscopy ◽  
Atomic Force ◽  
Safe Limits ◽  
Ft Ir ◽  
Recreational Use

With increasing global water temperatures and nutrient runoff in recent decades, the blooming season of algae lasts longer, resulting in toxin concentrations that exceed safe limits for human consumption and for recreational use. From the different toxins, microcystin-LR has been reported as the main cyanotoxin related to liver cancer, and consequently its abundance in water is constantly monitored. In this work, we report a methodology for decorating cellulose nanofibrils with β-cyclodextrin or with poly(β-cyclodextrin) which were tested for the recovery of microcystin from synthetic water. The adsorption was followed by Quartz Crystal Microbalance with Dissipation monitoring (QCM-D), allowing for real-time monitoring of the adsorption behavior. A maximum recovery of 196 mg/g was obtained with the modified by cyclodextrin. Characterization of the modified substrate was confirmed with Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Photoelectron Spectroscopy (XPS), Thermogravimetric Analysis (TGA), and Atomic Force Microscopy (AFM).

Characterization of Asymmetric Polydiacetylene Ultrathin Films

1995 ◽  
Vol 382 ◽  
Author(s):  
D. W. Cheong ◽  
V. Shivshankar ◽  
H. C. Wang ◽  
C. M. Sung ◽  
J. Kumar ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Second Harmonic ◽  
Film Deposition ◽  
Asymmetric Structure ◽  
Blodgett Film ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Ft Ir

ABSTRACTNonlinear optical (NLO) ultrathin films of a preforrned asymmetric polydiacetylene have been fabricated by Z-type Langmuir-Blodgett film deposition from the air-water interface. Induced in-plane orientation of the polydiacetylene backbone on the substrates has been confirmed by UV/Vis, FT-IR dichroism, and degenerate four wave mixing (DFWM) studies. All the measurements indicate that the backbone is prefe rentially oriented along the dipping direction. Second harmonic generation study suggests that the LB multilayers form an asymmetric structure (Z-type) due to the accumulation of 2-dimensional ordered monolayer and the dominant induced second order polarization is in the plane of the film. The film morphology and molecular orientation have been investigated by atomic force microscopy (AFM).

Fabrication and Characterization for Innate Super-Hydrophilic SiO2 Thin Films

2013 ◽  
Vol 743-744 ◽  
pp. 377-381
Author(s):  
Kai Bo Shen ◽  
Huan Yang ◽  
Jian Liu ◽  
Wei Wang ◽  
Yue Huang ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Acid Base ◽  
Coating Films ◽  
Hydroxyl Content ◽  
Force Microscopy ◽  
Atomic Force ◽  
Inorganic Thin Films ◽  
Ft Ir ◽  
Fabrication And Characterization

Distinguished with photoinduced super-hydrophilic inorganic thin films, non-photoinduced innate super-hydrophilic SiO2 thin films were successfully fabricated in this work. The SiO2 sol was prepared by acid-base two-step sol-gel method. The mix solution containing SiO2 sol and polyethylene glycol (PEG) was coated on glass substrate and then went through thermal treatment to obtain innate super-hydrophilic SiO2 thin films. The films were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and contact angle meter. The results show that the surface concave-convex microstructure and the hydroxyl content are the factors that endow the SiO2 coating films with innate super-hydrophilic property.

Effect of Copper Concentration on Characterization of Cu2Zn0.8Cd0.2SnS4 Pentrary Alloy Nanostructures

2015 ◽  
Vol 754-755 ◽  
pp. 1115-1119 ◽  
Author(s):  
A.S. Ibraheam ◽  
Y. Al-Douri ◽  
Uda Hashim
Keyword(s):  
Spin Coating ◽  
Copper Concentration ◽  
Sol Gel ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Average Grain Size ◽  
Alloy Nanostructures ◽  
Effect Of Copper

Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructure were prepared and deposited on glass substrates with different copper concentrations ( 0.3, 0.5, 0.7 and 0.9 mol/L ) using Sol gel – spin coating method.morphological and analytical studies were investigated by Field Emission-Scanning Electron Microscope (FE-SEM), atomic force microscopy (AFM). It is found that the average grain size of Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructure is 51.92 to 76.43 nm for the thin films prepared at 0.3, 0.5, 0.7 and 0.9 mol/L respectively .

scholarly journals Characterization of the Spindle Morphology Nanomicelles Assembled from Sericin and Gelatin

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Xiaozhou Su ◽  
Lei Li ◽  
Weihan Huang
Keyword(s):  
Electron Microscopy ◽  
Protein Concentration ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Ft Ir ◽  
And Storage ◽  
Ft Ir Spectroscopy

Complex nanomicelles were prepared by sericin and type A gelatin with molecular weight of 5789 Da and 128664 Da separately. The assembling conditions were as follows: mass ratio (sericin/gelatin) was 1 : 1, protein concentration was 0.5%, temperature was 35°C, and assembling time was 18 hours. Scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), and dynamic light scattering (DLS) were conducted to observe and characterize the complex nanomicelles. Results showed that the complex sericin/gelatin micelles was a kind of nanospindle micelles. The micelles had high electrochemical stability, thermal stability, antidilution stability, and storage stability.

scholarly journals Synthesis and Characterization of Nanostructure Tio2/Anthraquenone (AQ) Prepared by Sol-Gel Method

2017 ◽  
Vol 28 (1) ◽  
pp. 76
Author(s):  
Fadhela M. Hussein
Keyword(s):  
Sol Gel ◽  
X Ray Diffraction ◽  
First Order ◽  
Atomic Force ◽  
Rate Of Reaction ◽  
Ft Ir ◽  
Gel Technique ◽  
Uv Visible ◽  
Nano Titanium Dioxide

sol–gel technique conducted to synthesize nano titanium dioxide with anthraquenone (AQ) relatively in acidic pH. Nanoparticles were characterized using techniques like, Scanning Electrion Microscope (SEM), Atomic Force Microscope (AFM), UV-Visible Spectrioscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR), SEM picture display that the TiO2/AQ is spherical in style, the band gap of TiO2/AQ nanoparticle is (3.05eV), BET and BJH analysis provides Pore volume and specific Surface area and the kinetic studie Suggest that the reaction is pseudo first order and the rate of reaction was reduce with rising initial concentration for p-Nitrotolune.

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