scholarly journals Filler Dependent Microstructural and Optical Properties of PVDF/PEG Blends Versus PVDF/GO Nanocomposites

2021 ◽  
Author(s):  
Maheswar Panda
Keyword(s):  
Optical Properties ◽  
Polymer Nanocomposites ◽  
Spin Coating ◽  
Polyvinylidene Fluoride ◽  
Optical Constants ◽  
Structural Features ◽  
Visible Range ◽  
Solution Casting ◽  
Uv Visible ◽  
Optical Applications

Abstract The micro-structural features and the optical properties of polymer blends (PB) of polyvinylidene fluoride (PVDF) base with polyethylene glycol (PEG) and polymer nanocomposites (PNC) of PVDF base with graphene oxide (GO) as fillers are compared. Different weight fractions of PVDF/PEG and PVDF/GO samples were prepared through solution casting followed by spin coating. The microstructure of PVDF/PEG and PVDF/GO shows formation of immiscible/compatible/ homogenous microstructures over different extents of loading of the filler components. UV-Visible spectrometry revealed an increase in absorbance with the amount of filler and the absorbance was found to be lesser and highly dispersive for the PB as compared to PNC, attributed to the heterogeneity/electrical conductivity of the respective fillers of the two systems. Spectroscopic ellipsometry was used to study the various optical constants (e.g. refractive index, extinction co-efficient, etc.) & their dispersion behavior over the visible range of wavelengths. The parameters show large variation as a function of component fillers due to the different extent of interaction of matrix/filler. The optimized parameters were obtained for the 20% PB & the 5% PNC samples respectively, suggesting PNC with nano fillers are always to be a better choice for developing them as materials suitable for various optical applications.

Influence of Bi2O3 on Borophosphate Glasses Properties

2014 ◽  
Vol 979 ◽  
pp. 343-346 ◽  
Author(s):  
Natthakridta Chanthima ◽  
Jakrapong Kaewkhao
Keyword(s):  
Optical Properties ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Packing Density ◽  
Visible Range ◽  
Melt Quenching ◽  
Borophosphate Glasses ◽  
Borophosphate Glass ◽  
Uv Visible

Borophosphate glasses have been synthesized with a Bi2O3concentration of 15.0 to 25.0 mol%, added 2.5 mol% for each concentration, by the normal melt quenching technique at 1200 °C. The physical and optical properties of bismuth borophosphate glass systems have been studied. The glasses are characterized for their physical and optical properties. The density and molar volume of these glasses were found in the range 3.4391 to 3.9338 g/cm3and 52.2515 to 55.7557 cm3/mol, respectively. It was observed that the density and molar volume of these glasses was increased with increasing the concentration of Bi2O3. The absorption spectra of these glasses were recorded in the UV-Visible range. It has been found that, the absorption spectra were shifted to longer wavelength with higher Bi2O3concentration. In addition, the oxygen packing density of glass samples have been also investigated.

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

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.

Resolving Optical Constants from Reflectance of Liquids in the UV-Visible Range

1999 ◽  
Vol 53 (1) ◽  
pp. 92-96 ◽  
Author(s):  
Jukka A. Räty ◽  
Erik M. Vartiainen ◽  
Kai-Erik Peiponen
Keyword(s):  
Optical Constants ◽  
Visible Range ◽  
Uv Visible

scholarly journals Carbon Soot Polymer Nanocomposites (CSPNCs): Production, Surface Morphological, Glass Transition Temperature Phenomenon and Optical Properties

2021 ◽  
Author(s):  
Rakhi Tailor ◽  
Yogesh Kumar Vijay ◽  
Minal Bafna
Keyword(s):  
Optical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Polymer Nanocomposites ◽  
Synthesis Methods ◽  
Solution Casting ◽  
Deposition Method ◽  
The Third ◽  
Carbon Soot ◽  
Solution Casting Method

The present chapter covers the production and properties of carbon soot nanoparticles (CSNPCs) and their doped carbon soot polymer nanocomposites (CSPNCs). The first part of this chapter will provide a brief introduction of carbon soot, its morphology, production and synthesis methods. The second part will explain the investigation of carbon soot nanoparticles by flame deposition method and their properties. The third part will provide a short knowledge on polymer nanocomposites (PNCs) and their processing methods. The last part will illustrate the production of carbon soot polymer nanocomposites by solution casting method and their important properties. At the end, the chapter concludes with future scopes.

scholarly journals Tailoring the Optical Properties of Polymers Blend Nanocomposites

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Y.K. Saraswat ◽  
Shalini Agarwal ◽  
Vibhav K. Saraswat
Keyword(s):  
Optical Properties ◽  
Optical Constants ◽  
Dielectric Constants ◽  
Solution Casting ◽  
Structural And Optical Properties ◽  
Casting Method ◽  
Tio2 Content ◽  
Vis Spectroscopy ◽  
Solution Casting Method ◽  
Blend Nanocomposites

The presented work deals with the structural and optical properties of chemically synthesized TiO2 nanoparticles filled PC/PS blend nanocomposites. A series of PC/PS (100/0, 50/50, 0/100 wt%/wt %) -TiO2 (1, 2, 3 wt %) blend nanocomposites have been prepared by solution casting method. Prepared blend nanocomposites have been subjected to XRD, SEM and FTIR for structural analysis. Optical constants have been analyzed using UV-Vis spectroscopy. The XRD, SEM and FTIR spectrum confirms the formation of PC/PS-TiO2 blend nanocomposites. Results reveal the decrease in band gap and enhancement in optical constants like, extinction coefficient, refractive index and dielectric constants of blend nanocomposites with nanofiller TiO2 content.

A Study on Structure and Optical Properties of Sputtered TiO2 Films

2014 ◽  
Vol 875-877 ◽  
pp. 223-227
Author(s):  
Mei Dong Huang ◽  
Shan Du ◽  
Hong Yu Li ◽  
Chun Wei Liu ◽  
Xiao Hong Tang
Keyword(s):  
Optical Properties ◽  
Optical Constants ◽  
Visible Range ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Argon Flow ◽  
Titanium Oxide Films ◽  
K9 Glass

Influence of argon flow on the optical properties of titanium oxide films, which were fabricated on well-polished K9 glass substrate through r.f. magnetron sputtering, has been investigated. X-ray diffraction (XRD) was employed to analyse the microstructure. Surface morphology was observed by atomic force microscopy (AFM). Transmittance of the films was measured within the visible range by UV-3600 spectrometer. The optical constants, such as thickness, refractive index and extinction coefficient, were measured using an ellipsometer. The experimental results and the effects of argon flow on optical constants of the TiO2films have been discussed and analysed.

scholarly journals Effect of Phosphoric Acid Concentration on the Optical Properties of Partially Phosphorylated PVA Complexes

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Asmalina Mohamed Saat ◽  
Mohd Rafie Johan
Keyword(s):  
Optical Properties ◽  
Phosphoric Acid ◽  
Polyvinyl Alcohol ◽  
Absorption Spectra ◽  
Solution Casting ◽  
Casting Technique ◽  
Uv Absorption Spectra ◽  
Solution Casting Technique ◽  
Uv Visible ◽  
Phosphoric Acid Concentration

Partially phosphorylated polyvinyl alcohol (PPVA) films were prepared at five mole ratios of phosphoric acid (PA) using solution casting technique. The optical properties of the PPVA films were examined using UV-visible (UV) and photoluminescence (PL) spectroscopy. The UV absorption spectra reveal that the absorption peaks are blue-shifted with an increase in PA concentration added to the pure PVA. The PL spectra show the presence of peaks which are characteristic of isotactic (389–398, 460–462 nm), syndiotactic (418–420 nm), and atactic (440–446 nm) configurations of the PPVA. The results also show the peak of O–P–O bonding at a wavelength range of 481–489 nm.

Physical Properties of MEH-PPV Thin Films at Different Ageing

2015 ◽  
Vol 1109 ◽  
pp. 534-538
Author(s):  
Najwa Ezira Ahmed Azhar ◽  
A.K.S. Shafura ◽  
Irma Hidayanti Halim Affendi ◽  
Shafinaz Sobihana Shariffudin ◽  
Mohamad Rusop
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Ageing Time ◽  
Toluene Solution ◽  
Band Gaps ◽  
Phenylene Vinylene ◽  
Electrical And Optical Properties ◽  
Uv Visible ◽  
Atom Force Microscope

Poly (2-methoxy-5(2’-ethylhexyloxy)-phenylene vinylene) (MEH-PPV) thin films were deposited by spin-coating technique. The MEH-PPV powders were dissolved in toluene solution. In this study, we report the effect of ageing on electrical and optical properties MEH-PPV thin films. The thickness of MEH-PPV increased as ageing time increased. The electrical properties were obtained using 2-point probe. The resistivity of thin films decreased as ageing time increased and vice versa with conductivity. The optical properties were investigated using UV-Visible-NIR (UV-VIS-NIR) and atom force microscope (AFM). From UV-Vis result shows the lower band gaps of films in toluene solution proved MEH-PPV has longer conjugation segments. The surface roughness of thin films decreased with the increased of ageing time; which is caused by the aggregation of the MEH-PPV. The PL spectra show the quenching of emission might be due to the conjugation of length polymer changes in different ageing times.

scholarly journals Self-assembled graphene-based microfibers with eclectic optical properties

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mahdi Ghamsari ◽  
Tayyebeh Madrakian ◽  
Abbas Afkhami ◽  
Mazaher Ahmadi
Keyword(s):  
Optical Properties ◽  
Free Standing ◽  
Mechanical And Electrical Properties ◽  
Near Ir ◽  
The Subject ◽  
Uv Visible ◽  
Self Assembled ◽  
Optical Applications ◽  
Upconversion Emissions ◽  
Tunable Interference

AbstractThe construction of graphene-based microfibers with reinforced mechanical and electrical properties has been the subject of numerous researches in recent years. However, the fabrication of graphene-based fibers with remarkable optical features still remains a challenge and has not been addressed so far. This paper aims to report a series of flexible self-assembled fibers, synthesized through a few-minute sonication of thermally oxidized graphene oxide nanosheets, so-called Nanoporous Over-Oxidized Graphene (NOG), in an acidic medium. These free-standing glassy fibers were classified into four distinct morphological structures and displayed a collection of intriguing optical properties comprising high transparency, strong birefringence, fixed body colorations (e.g. colorless, blue, green, and red), tunable interference marginal colorations, UV–visible-near IR fluorescence, and upconversion emissions. Moreover, they exhibited high chemical stability in strongly acidic, basic, and oxidizing media. The foregoing notable attributes introduce the NOG fiber as a promising candidate both for the construction of graphene-based photoluminescent textiles and the development of a wide variety of optical applications.

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