Synthesis, microstructure and optical characterization of zirconium oxide nanostructures

Kumari, Latha; Du, Guohao; Li, W.Z.; Vennila, R. Selva; Saxena, Sumit; Wang, D.Z.

doi:10.1016/j.ceramint.2009.02.007

Cited by 104 publications

(55 citation statements)

References 33 publications

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“…Lately, nanocrystalline substances, in particular zirconia nano-particles (ZrO 2 -NP)s, have gained much attention due to their exceptional physical and chemical properties, which are considerably different from their microcrystalline counterparts [6,7]. (ZrO 2 -NP)s as an ordinary refractory material, has extensive uses in lots of technological areas, such as damage-resistant optical coatings, high-performance transformation-toughened structural engineering ceramics, fuel-cell electrolytes, gate dielectrics, catalysts, buffer layers for superconductor growth, and oxygen sensors [8,9].…”

Section: Introductionmentioning

confidence: 99%

Novel flame retardant zirconia-reinforced nanocomposites containing chlorinated poly(amide-imide): synthesis and morphology probe

Mallakpour

Zeraatpisheh

2013

Journal of Experimental Nanoscience

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In the present investigation, a thermally stable poly(amide-imide) (PAI) was synthesised from the polymerisation reaction of 4,4 0 -methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) as a chlorinated diacid with 4,4 0 -methylenebis (3-chloro-2,6-diethylaniline) using molten tetra-n-butylammonium bromide and triphenyl phosphite as a condensing agent and green media. This methodology offers enhancements for the synthesis of polymers with regard to yield of products, simplicity in operation, and green aspects by avoiding volatile solvents. From the chemical point of view, the chloride and ethylene groups impart to the polymer's chain increased solubility of obtained polymer in organic solvent. Then, the surface of zirconia nanoparticles (ZrO 2 -NPs) was modified with 3-aminopropyltriethoxylsilane as a coupling agent. The obtained polymer and inorganic metal oxide NPs were used to prepare PAI/ZrO 2 nanocomposites through ultrasonic irradiation. The formation of PAI was confirmed by 1 H-NMR, FT-IR spectroscopy, and elemental analysis. The obtained polymer was synthesised with good yield (90%) and moderate inherent viscosity (0.48 dL/g). The resulting NP filled composites were also characterised by FT-IR, XRD, FE-SEM, TEM and TGA. The TEM and FE-SEM results indicated a high dispersion level of the nanoscale inorganic particles in the polymer matrix. In this article, ZrO 2 -NPs are employed to improve flame retardancy of nanocomposites. TGA thermographs confirmed that the heat stability of the prepared NP-reinforced composites was improved in the presence of ZrO 2 nanocrystals.

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Section: Introductionmentioning

confidence: 99%

Novel flame retardant zirconia-reinforced nanocomposites containing chlorinated poly(amide-imide): synthesis and morphology probe

Mallakpour

Zeraatpisheh

2013

Journal of Experimental Nanoscience

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“…It can be organized into three phases at different temperatures: monoclinic, tetragonal and cubic. Monoclinic is the most thermodynamically stable phase at room temperature [9].…”

Section: Introductionmentioning

confidence: 99%

Novel polyvinylpyrrolidone nanocomposites with dispersed poly(amide-imide)/nano-ZrO2 as new nano-filler: morphology, thermal and optical properties

Mallakpour

Mani

2015

Polym. Bull.

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In this paper, ultrasonic technique and a biocompatible coupling agent were used for the surface modification of ZrO 2 nanoparticles (NPs). The grafting of N-trimellitylimido-L-leucine as bioactive and biocompatible coupling agent on the surface of ZrO 2 NPs was confirmed by Fourier transmission infrared spectroscopy and thermogravimetric analysis. Subsequently, the modified NPs were incorporated into the poly(amide-imide) (PAI) matrix through good dispersion. Therefore, poly(amide-imide)/nano-ZrO 2 nanocomposite (PAI/nano-ZrO 2 ) was synthesized via ultrasonic technique. Field emission scanning electron microscopy and transmission electron microscopy images of the obtained PAI/nano-ZrO 2 illustrated nanostructured morphology. Then, PAI/nano-ZrO 2 was used as a nano-filler and was embedded into the polyvinylpyrrolidone (PVP) in various weight percent to form PVP NCs to improve its properties. These NCs were investigated by different analyses. Change in the results of analysis when compared to the pure PVP confirmed that there are good interactions between nano-filler and the PVP matrix as a result of hydrogen bonding. The thermal stability of the PVP was enhanced with the addition of small amounts of nano-filler. Also, the incorporation of the PAI/nanoZrO 2 influenced the UV-Vis absorption of the pure PVP.

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“…The success of this field is mainly assigned to the possibility of preparing inorganic structures by using the soft chemistry approach, also known as ''chimie douce,'' such as the sol-gel processing [6]. Among several inorganic particles used to modify epoxy systems, zirconia appears as a very promising inorganic component to impart some specific characteristics such as, high refractive index, large optical band gap, and low optical loss [7]. These properties associated with high transparency are very important for encapsulating light-emitting diodes (LEDs), because they are able to reduce the refractive index mismatch between the LED dies and air [8,9].…”

Section: Introductionmentioning

confidence: 99%

Zirconium-methacrylate oxoclusters as new hybrid materials for the modification of epoxy systems

et al. 2015

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Oxozirconium clusters bearing methacrylate moiety (ZrMe) were synthesized by sol-gel process and used in epoxy networks to develop epoxy-based nanocomposites with potential application as encapsulant for light-emitting diode. Diglycidyl ether of bisphenol A-based epoxy resin was previously functionalized with acrylic acid to introduce some vinyl groups in the matrix and improve its interaction with the oxocluster. The ZrMe particles were previously dispersed in the epoxy matrix or in the 4-methyl-tetrahydrophthalic anhydride used as hardener, and the systems were cured with anhydride or with a combination of anhydride and benzoyl peroxide. The last compound promotes the covalent bond between the epoxy matrix and the ZrMe through free radical reactions between the vinyl groups. The dispersion of ZrMe into the epoxy matrix resulted in a significant increase in viscosity, mainly for systems dispersed with a combination of high shear mechanical mixing and ultrasonification. The dispersion of ZrMe into the anhydride resulted in nanocomposites with higher transparency, better dispersion of the oxocluster into the matrix bulk, as observed by transmission electron microscopy, and higher thermal conductivity, mainly for systems cured with anhydride and peroxide. The use of anhydride in combination with BPO also resulted in significant increase in glass transition temperature.

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Synthesis, microstructure and optical characterization of zirconium oxide nanostructures

Cited by 104 publications

References 33 publications

Novel flame retardant zirconia-reinforced nanocomposites containing chlorinated poly(amide-imide): synthesis and morphology probe

Novel flame retardant zirconia-reinforced nanocomposites containing chlorinated poly(amide-imide): synthesis and morphology probe

Novel polyvinylpyrrolidone nanocomposites with dispersed poly(amide-imide)/nano-ZrO2 as new nano-filler: morphology, thermal and optical properties

Zirconium-methacrylate oxoclusters as new hybrid materials for the modification of epoxy systems

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