Synthesis of terbium(III) complex with a biscoumarin derivative and its immobilization in PMMA-based composite thin films with fluorescent properties

AbstractAn amorphous complex of Tb(III) with the biscoumarin derivative 3,3′-[(4-hydroxyphenyl)methylene)]bis-(4-hydroxy-2H-1-benzopyran-2-one), Tb(H2L)3, was successfully synthesized and characterized. IR- and 1H-NMR-spectroscopy were used to investigate the coordination of the ligand around the Tb(III) ion. Values for the quantum yield and the life time of the excited state of the complex were obtained. The complex was immobilized in transparent and flexible PMMA-based films by a simple casting technique. PMMA/chloroform solutions were used in synthetic procedures that resulted in both glass-supported and self-supporting nanocomposite films. The morphology of the films was studied by scanning electron microscopy, atomic force microscopy and transmission electron microscopy, showing the formation of crack-free films. The presence of the Tb(III) complex in the matrix was proven by the presence of characteristic bands in the IR spectra. Fluorescence microscopy and fluorescence spectroscopy demonstrated the promising optical properties of the films showing the characteristic emission bands of the Tb(III) ions. The longer life time of the excited state of the immobilized complex confirmed the protective role of the PMMA matrix on the optical properties of the complex. The composite films possessing optical properties have the potential for application as active components in optical devices.

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Surface, Temperature and Optical Properties Pd-TiO2 Doped PVA Nanocomposite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.962.77 ◽

2019 ◽

Vol 962 ◽

pp. 77-81

Author(s):

B. Guruswamy ◽

V. Ravindrachary ◽

C. Shruthi ◽

M. Mylarappa ◽

G.O. Obaiah

Keyword(s):

Optical Properties ◽

Thermal Properties ◽

Nanocomposite Films ◽

Solution Casting ◽

Absorption Method ◽

Casting Technique ◽

Solution Casting Technique ◽

Modified Surface ◽

Uv Visible ◽

Effect Of Pd

The effect of Pd-TiO2 nanoparticle doping on structural, optical and thermal properties of the PVA polymer has been investigated using FTIR, UV-Visible, TGA and FESEM analysis. nanosized Pd-TiO2 particles were synthesized using standard method. Pure and Pd-TiO2/PVA nanocomposite films were prepared using solution casting technique. The FTIR study confirmed that the Pd-TiO2 nanoparticles interacts with the OH group of PVA polymer and forms the complex. The presence of these complexes affects the optical and thermal properties the composite. The change in the optical properties was studied using UV-Vis absorption method. The effect of doping on the thermal properties was studied using TGA method and the modified surface morphology using FESEM.

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Optical And Electrical Properties of PVA/A-Al2O3 Nanocomposite Films

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v16i1.8362 ◽

2019 ◽

Vol 16 (1) ◽

pp. 280-298

Author(s):

Sara El-Molla ◽

R. Mahmoud ◽

A.F. Mansour ◽

S.F. Mansour ◽

M.A. Abdo

Keyword(s):

Electron Microscopy ◽

Interfacial Polarization ◽

Combustion Method ◽

Nanocomposite Films ◽

Al2o3 Content ◽

Al2o3 Nanoparticles ◽

Ac Electrical Conductivity ◽

Casting Technique ◽

Auto Combustion ◽

Uv Visible

In the present study, a-Al2O3 nanoparticles were synthesized using the citrate-nitrate auto combustion method. Nanocomposites of PVA/a-Al2O3 were intended by solution casting technique. The micrograph of samples were analysed by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM) and UV-visible spectroscopy analysis. UV-visible results showed that the direct optical band gap decreased with the increase of a-Al2O3 content. The refractive index has been dissected using Wemple and DiDomenico model. Hopping of charge carriers besides interfacial polarization could expound the demeanor of dielectric constant (E'), dielectric loss (E'') and ac electrical conductivity (0-ac) with the frequency and temperatures.

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The Electrodeposition of Nanostructured Ni-TiN Composite Films

Materials Science Forum ◽

10.4028/www.scientific.net/msf.620-622.727 ◽

2009 ◽

Vol 620-622 ◽

pp. 727-730 ◽

Cited By ~ 1

Author(s):

Chao Cai ◽

Jun Ying Yin ◽

Zhao Zhang ◽

Jian Feng Yang

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Ph Value ◽

Composite Films ◽

Bath Temperature ◽

Nanocomposite Films ◽

Solution Ph ◽

Corrosion Properties ◽

Tin Nanoparticles ◽

Scanning Electron

The Ni-TiN nanocomposite films have been successfully fabricated onto commercial brass copper substrates using dc electroplating technique, and the microstructure and anti-corrosion properties of the optimized Ni-TiN nanocomposite have been respectively characterized using scanning electron microscopy (SEM). The results show that the morphology of Ni-TiN composite film is sensitively dependent on the electroplating current density, the concentration of TiN nanoparticles, the solution stirring speed, the bath temperature and the solution pH value.

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Effect of Clay Nanofillers on the Mechanical and Water Vapor Permeability Properties of Xylan–Alginate Films

Polymers ◽

10.3390/polym12102279 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2279

Author(s):

Darrel S. Naidu ◽

Maya J. John

Keyword(s):

Optical Properties ◽

Water Vapor ◽

Water Sorption ◽

Food Packaging ◽

Water Vapor Permeability ◽

Nanocomposite Films ◽

Vapor Permeability ◽

Solvent Casting ◽

Casting Technique ◽

Silicate Layers

In this study, xylan–alginate-based films were reinforced with nanoclays (bentonite or halloysite) by the solvent casting technique. The effect of the nanoclay loadings (1–5 wt %) on various properties—mechanical, optical, thermal, solubility, water sorption, and water vapor permeability (WVP)—of the xylan–alginate films were examined for their application as food packaging materials. A 5 wt % loading of either bentonite or halloysite resulted in a 49% decrease of the WVP due to the impermeable nature of the silicate layers that make up both bentonite and halloysite. Thermal stability and solubility of the nanocomposite films were not significantly influenced by the presence of the nanoclays, whereas the optical properties were significantly improved when compared to neat xylan–alginate blend. In general, films reinforced with bentonite exhibited superior mechanical and optical properties when compared to both halloysite-based nanocomposite and neat films.

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Fabrication of Nanostructured Kaolinite Doped Composite Films from Silicone Rubber with Enhanced Properties

Journal of Composites Science ◽

10.3390/jcs3020050 ◽

2019 ◽

Vol 3 (2) ◽

pp. 50 ◽

Cited By ~ 1

Author(s):

Abdullah Muhammad Zakaria ◽

Shaikat Chandra Dey ◽

Muhammad Mominur Rahman ◽

Mithun Sarker ◽

Md. Ashaduzzaman ◽

...

Keyword(s):

Weight Loss ◽

Silicone Rubber ◽

Composite Films ◽

Filler Loading ◽

Substantial Improvement ◽

Nanocomposite Films ◽

Casting Technique ◽

Mechanical Tensile ◽

Develop Environment ◽

Engineering Polymers

Naturally occurring nanomaterials are finding growing interests in tailoring properties of engineering polymers for advanced applications. The objective of this study was to develop environment-friendly nanocomposite films by reinforcing kaolinite nanofillers (1–10 wt%) in silicone rubber (SR) matrix using a simple solvent casting technique. Kaolinite-reinforced films showed substantial improvement in mechanical (tensile strength, Young’s modulus, and elongation at break) and thermal properties at very low filler loading (5 wt%). The improvement of solvent resistance nature of the fabricated films was another critical aspect of this study. Unfilled SR film showed ~19% weight loss when immersed in toluene for 4 h at 25 °C, whereas only ~4% weight loss was recorded in the case of 5% (w/w) kaolinite loaded film. Therefore, kaolinite has the potential to bring significant improvement in the properties of SR. This study indicates that there is plenty of room at the bottom for proper utilization of the potential of kaolinite for developing SR-based composite materials for potential applications in many industries, such as textile, household cleaning, construction, electronics, automotive, medical, etc.

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Effect of Length of Cellulose Nanofibers on Mechanical Reinforcement of Polyvinyl Alcohol

Polymers ◽

10.3390/polym14010128 ◽

2021 ◽

Vol 14 (1) ◽

pp. 128

Author(s):

Mengxia Wang ◽

Xiaran Miao ◽

Hui Li ◽

Chunhai Chen

Keyword(s):

Mechanical Properties ◽

Polyvinyl Alcohol ◽

High Performance ◽

Mechanical Performance ◽

Cellulose Nanofibers ◽

Composite Films ◽

Nanocomposite Films ◽

Mechanical Reinforcement ◽

Research Attention ◽

Casting Technique

Cellulose nanofibers (CNF), representing the nano-structured cellulose, have attained an extensive research attention due to their sustainability, biodegradability, nanoscale dimensions, large surface area, unique optical and mechanical performance, etc. Different lengths of CNF can lead to different extents of entanglements or network-like structures through van der Waals forces. In this study, a series of polyvinyl alcohol (PVA) composite films, reinforced with CNF of different lengths, were fabricated via conventional solvent casting technique. CNF were extracted from jute fibers by tuning the dosage of sodium hypochlorite during the TEMPO-mediated oxidation. The mechanical properties and thermal behavior were observed to be significantly improved, while the optical transparency decreased slightly (Tr. > 75%). Interestingly, the PVA/CNF20 nanocomposite films exhibited higher tensile strength of 34.22 MPa at 2 wt% filler loading than the PVA/CNF10 (32.55 MPa) while displayed higher elastic modulus of 482.75 MPa than the PVA/CNF20 films (405.80 MPa). Overall, the findings reported in this study provide a novel, simple and inexpensive approach for preparing the high-performance polymer nanocomposites with tunable mechanical properties, reinforced with an abundant and renewable material.

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TAILORING THE ELECTRICAL AND OPTICAL PROPERTIES OF CARBON NANOTUBE REINFORCED TRANSPARENT TiO2 COMPOSITES BY VARYING NANOTUBE CONCENTRATIONS

Surface Review and Letters ◽

10.1142/s0218625x19501038 ◽

2019 ◽

Vol 27 (02) ◽

pp. 1950103

Author(s):

BENGÜ ÖZUĞUR UYSAL ◽

ÜMIT ÖZLEM AKKAYA ARIER ◽

ÖNDER PEKCAN

Keyword(s):

Optical Properties ◽

Carbon Nanotube ◽

Composite Film ◽

Sol Gel ◽

Composite Films ◽

Nanocomposite Films ◽

Bandgap Energy ◽

Electrical And Optical Properties ◽

Sem Image ◽

Beneficial Effects

In the present work, multi-walled carbon nanotube (MWCNT)-doped TiO2 nanocomposite films were synthesized by sol–gel method. The influence of nanotube concentration on the structural, electrical and optical properties of the films was investigated. The beneficial effects of the addition of carbon nanotubes into a TiO2 film and titania-coated MWCNTs have much in common. On the other hand, this work contributes to the previous studies in terms of the optical and electrical properties of MWCNT. For this reason, MWCNT/rare brookite-phased TiO2 matrix as simple sol–gel deposited composite films were investigated in our study. The XRD studies showed that the composite film has a brookite crystal structure at the annealing temperature of 450∘C. According to the surface morphology investigations, SEM image of nanocomposite film shows that composite film has a granular and rod-like structure. The absorbance measurements of the films were carried out by the UV–Vis spectrophotometer to investigate transparency and to calculate the bandgap energy of composite films. The surface resistivity of the MWCNT-doped TiO2 composites decreased from [Formula: see text] to [Formula: see text] ohm/sq with increase in MWCNT content.

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The Effect of CoFe2O4, CuFe2O4 and Cu/CoFe2O4 Nanoparticles on the Optical Properties and Piezoelectric Response of the PVDF Polymer.

10.21203/rs.3.rs-853775/v1 ◽

2021 ◽

Author(s):

Mai EL-Masry ◽

Rania Ramadan

Keyword(s):

Optical Properties ◽

Polyvinylidene Fluoride ◽

Interfacial Polarization ◽

Nanocomposite Films ◽

Piezoelectric Response ◽

Copper Ferrite ◽

Characterization Methods ◽

Casting Technique ◽

Solution Casting Technique ◽

Pure Pvdf

Abstract Cobalt ferrite, Copper ferrite and cobalt doped copper ferrite nanoparticles have been synthesized and characterized using different characterization methods (XRD, FTIR and FESEM). The prepared nanoparticles have been used as promising fillers of the polyvinylidene fluoride (PVDF) polymer. The PVDF/(Cu-CoFe2O4, CoFe2O4, and CuFe2O4) nanocomposites films have been prepared via a simple solution casting technique. The optical properties and the piezoelectric response of the prepared nanocomposite films have been studied. The study showed that Cu-CoFe2O4, CoFe2O4, and CuFe2O4 have enhanced the interfacial polarization density and dielectric constant. The optical conductivity value of PVDF/ (Cu-CoFe2O4 and CoFe2O4) increased five times compared with the pure PVDF. Also, an increase in the piezoelectric response has been recorded by adding the nano-fillers to the pure PVDF.

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