Synthesis and characterization of poly(4-vinyl pyridine-co-styrene)/FHAP nanocomposite, and its biomedical application

Dhanalakshmi, C. P.; Vijayalakshmi, L.; Narayanan, Vijaykrishnan

doi:10.1007/s13204-012-0173-x

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Nanocomposite is one of the promising fields for current research and development in all the technical disciplines (Sureshkumar et al 2016;Dhanalakshmi et al 2013). Polymer/layered silicate nanocomposites (PLSN) display a significant interest among the industry and academia owing to their enhanced properties over conventional (micro and macro) composites.…”

Section: Introductionmentioning

confidence: 99%

Sonication-assisted synthesis of polystyrene (PS)/organoclay nanocomposites: influence of clay content

Suresh

Kumar

et al. 2017

Appl Nanosci

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This article presents the synthesis of a series of polystyrene (PS)/organoclay nanocomposite films consisting of different contents of clay (1-7 wt%) by sonicationcoupled solvent-blending technique. The prepared PS nanocomposite films were characterized using various techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA). The XRD and TEM results revealed the formation of exfoliated nanocomposites at lower loading of organoclay (\5 wt%). The presence of various functional groups in the organoclay and PS/organoclay nanocomposite was verified by FTIR spectra. The thermal stability of PS nanocomposites was significantly improved as compared to pristine PS, which is evident from TGA analysis. When 10% mass loss was chosen as a point of reference, the thermal degradation temperature of PS nanocomposite holding 7 wt% of organoclay was found to be 30°C more over pristine PS. The thermal kinetic parameters such as activation energy (E a ), pre-exponential factor (A), and the order of reaction (n) were determined by employing the Coats-Redfern model. Thermal degradation reaction mechanism of PS nanocomposites was also investigated.

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Section: Introductionmentioning

confidence: 99%

Sonication-assisted synthesis of polystyrene (PS)/organoclay nanocomposites: influence of clay content

Suresh

Kumar

et al. 2017

Appl Nanosci

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“…Coatings containing P4VPy have been used as pH‐sensitive devices, 21 nitroaromatic sensors, 22 corrosion inhibition, 23 dye‐sensitized solar cells 24 and transport layers in LEDs 25 . Other studies discuss the reinforcement of P4VPy with nanographite for sensors, 26 Au for intelligent catalysts, 27 fluoridated hydroxyapatite for medical uses, 28 with Ag for antibacterial surfaces, 29 CdSe nanocrystals for luminescent devices, 30 and aluminum nitride (AlN) for heat dissipation 31 . The latter type of filler is a ceramic material, with large thermal conductivity (~321 W/m K at 300 K) 32 and a wide bandgap of 6.2 eV.…”

Section: Introductionmentioning

confidence: 99%

Novel aspects derived from the influence of dispersion properties of poly(4‐vinylpyridine)/aluminum nitride nanocomposite encapsulants on light‐extraction efficiency of light emitting diodes

Barzic¹

2021

Polymers for Advanced Techs

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New nanocomposites based on poly(4‐vinylpyridine) (P4VPy) containing 0%–5% aluminum nitride (AlN) are characterized to check their suitability as encapsulants for light emitting diodes with better light extraction efficiency (LEE). Optical microscopy and scanning electron microscopy images indicate a good dispersion of the nanofillers inside the P4VPy. Spectroscopy data reveal that up to 1% filler, the transparency is preserved, being 78.2% at 450 nm for the sample filled with 1% AlN. Introduction of polar nanoceramics in the matrix determines an increase in the refractive index from 1.618 (0%AlN) to 1.650 (5%AlN) at 486 nm. All samples display normal dispersion curves in visible range. The linear and nonlinear optical parameters are enhanced upon reinforcement with AlN nanoparticles. New insights on LEE are extracted by analyzing the implications of dispersion of the samples at semiconductor and air interfaces, respectively. Implementation of the composite samples in a GaN‐based light emitting diodes determines enlargement of the critical angle and light escape cone. By making a comparison of the device in the presence and absence of P4VPy/AlN 1% encapsulant, the LEE at 486 nm at GaN interface improves by 58.4%, while at air interface LEE is increased up to 21.4%.

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“…Generally, it is possible to produce small particle size and high-purity FA powders using sol gel precipitation techniques, if the precipitation system and conditions are well controlled and there is a reproducible precipitate. There are several significant variables of the precipitation process such as solution concentration (Ca/P ratio), PH, acid addition rate, stirrer speed, temperature, reaction time and atmospheric condition [19].…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of Sodium alginate mediated Fluorapatite Nanoparticle via Sol-Gel method

Kia

Ahmad

Shameli

2021

JRNN

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Fluorapatite (FA) can be used as a bioactive substance in the body, especially the teeth implants. The FA nanoparticle was synthesized by adding the fluorine to the structure of HA using sol–gel method and the heat treatment of 700 °C. Being low costs, eco-friendly and safer features are obvious advantages of the green synthesis of FA nanoparticles by using bio stabilizer of sodium alginate. Calcium nitrate tetrahydrate, diammonium phosphate, ammonium fluoride were used as precursors of Ca, P and F respectively with the ratio of 1:67 Ca/P. The presence of crystal structure of HA and FA investigated by the results of XRD which confirmed the substitution of hydroxyl groups with the fluorine in the crystal structure of apatite. FTIR obtained that fluorine was substituted by hydroxyl groups in the structure of fluoridated hydroxyapatite by disappearing the hydroxyl groups at 3600 cm-1 in the FA. TGA investigated the thermal stability of the nanoparticles that showed the discrepancy of weight loss for HA and FA between 600?C to 800?C. By using TEM, average sizes of 35 and 49 nm were determined for HA and FA respectively. FESEM results confirmed the shapes and distribution of particles of HA and FA in that, round like for the former and rode like for the later. The overall performance of utilizing sodium alginate (SA) as a bio-stabilizer is to obtain better precipitate which leads to having better crystallinity and smaller particle size and thermal stability remarkably improved.

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Synthesis and characterization of poly(4-vinyl pyridine-co-styrene)/FHAP nanocomposite, and its biomedical application

Cited by 5 publications

References 38 publications

Sonication-assisted synthesis of polystyrene (PS)/organoclay nanocomposites: influence of clay content

Sonication-assisted synthesis of polystyrene (PS)/organoclay nanocomposites: influence of clay content

Novel aspects derived from the influence of dispersion properties of poly(4‐vinylpyridine)/aluminum nitride nanocomposite encapsulants on light‐extraction efficiency of light emitting diodes

Green synthesis of Sodium alginate mediated Fluorapatite Nanoparticle via Sol-Gel method

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