Magnetoelectric properties of lead-free (80Bi0.5Na0.5TiO3-20Bi0.5K0.5TiO3)-Ni0.8Zn0.2Fe2O4 particulate composites prepared by in situ sol-gel

Deposition of highly textured ReBa2Cu3O7−δ (RBCO) films on metallic substrates requires a buffer layer to prevent chemical reactions, reduce lattice mismatch between metallic substrate and superconducting film layer, and to prevent diffusion of metal atoms into the superconductor film. Nickel tapes are bi-axially textured by cold rolling and annealing at appropriate temperature (RABiTS) for epitaxial growth of YBa2Cu3O7−δ (YBCO) films. As buffer layers, several oxide thin films and then YBCO were coated on bi-axially textured nickel tapes by dip coating sol-gel process. Biaxially oriented NiO on the cube-textured nickel tape by a process named Surface-Oxidation- Epitaxy (SEO) has been introduced as an alternative buffer layer. in this work we have studied in situ growth of nickel oxide by ESEM and hot stage.Representative cold rolled nickel tape (99.999%) was annealed in an electric furnace under 4% hydrogen-96% argon gas mixture at 1050°C to get bi-axially textured nickel tape.

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A Phenomenological Approach to Study the Magnetoelectric (ME) Response of Lead free Magnetostrictive NiFe2O4– Piezoelectric BaZr0.2Ti0.8O3 Particulate Composites

Solid-State Electronics ◽

10.1016/j.sse.2021.108110 ◽

2021 ◽

pp. 108110

Author(s):

Pradeep Chavan

Keyword(s):

Phenomenological Approach ◽

Lead Free ◽

Particulate Composites

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In‐Situ Construction of Lead‐Free Perovskite Direct Z‐Scheme Heterojunction Cs 3 Bi 2 I 9 /Bi 2 WO 6 for Efficient Photocatalysis of CO 2 Reduction

Solar RRL ◽

10.1002/solr.202000691 ◽

2020 ◽

Author(s):

Zhao-Lei Liu ◽

Rui-Rui Liu ◽

Yan-Fei Mu ◽

You-Xiang Feng ◽

Guang-Xing Dong ◽

...

Keyword(s):

Lead Free

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Carbon Nitride Quantum Dots Modified TiO2 Inverse Opal Photonic Crystal for Solving Indoor VOCs Pollution

Catalysts ◽

10.3390/catal11040464 ◽

2021 ◽

Vol 11 (4) ◽

pp. 464

Author(s):

Jie Yu ◽

Angel Caravaca ◽

Chantal Guillard ◽

Philippe Vernoux ◽

Liang Zhou ◽

...

Keyword(s):

Quantum Dots ◽

Carbon Nitride ◽

Sol Gel ◽

Green Energy ◽

Inverse Opal ◽

Oxidation Reactions ◽

Composite Photocatalyst ◽

Colloidal Photonic Crystals ◽

Inverse Opal Structure

Indoor toxic volatile organic compounds (VOCs) pollution is a serious threat to people’s health and toluene is a typical representative. In this study, we developed a composite photocatalyst of carbon nitride quantum dots (CNQDs) in situ-doped TiO2 inverse opal TiO2 IO for efficient degradation of toluene. The catalyst was fabricated using a sol-gel method with colloidal photonic crystals as the template. The as-prepared catalyst exhibited excellent photocatalytic performance for degradation of toluene. After 6 h of simulated sunlight irradiation, 93% of toluene can be converted into non-toxic products CO2 and H2O, while only 37% of toluene is degraded over commercial P25 in the same condition. This greatly enhanced photocatalytic activity results from two aspects: (i) the inverse opal structure enhances the light harvesting while providing adequate surface area for effective oxidation reactions; (ii) the incorporation of CNQDs in the framework of TiO2 increases visible light absorption and promotes the separation of photo-generated charges. Collectively, highly efficient photocatalytic degradation of toluene has been achieved. In addition, it can be expanded to efficient degradation of organic pollutants in liquid phase such as phenol and Rhodamine B. This study provides a green, energy saving solution for indoor toxic VOCs removal as well as for the treatment of organic wastewater.

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Characterization of in-situ zirconia/mullite composites prepared by sol-gel technique

Journal of Asian Ceramic Societies ◽

10.1080/21870764.2021.1929738 ◽

2021 ◽

pp. 1-7

Author(s):

Abdu. I. Abdallah ◽

M. Sayed ◽

M. Awaad ◽

Adam H. E. Yousif ◽

S.M. Naga

Keyword(s):

Sol Gel ◽

Gel Technique

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KNN-BF Lead-Free Piezoelectric Ceramics Synthesized by Sol-Gel Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.740.3 ◽

2015 ◽

Vol 740 ◽

pp. 3-6

Author(s):

Guo Yuan Cheng ◽

Xing Hua Fu ◽

Xin Jin ◽

Wen Hong Tao ◽

Yu Qin Qiang

Keyword(s):

Comparative Analysis ◽

Citric Acid ◽

Dielectric Loss ◽

Sintering Temperature ◽

Sol Gel ◽

Piezoelectric Ceramics ◽

Lead Free ◽

Gel Method ◽

Sol Gel Method ◽

Metal Chelator

KNN-BF piezoelectric ceramics synthesized by sol-gel method in this experiment. By controlling bismuth and iron content in the system to study effects of them. We selected citric acid as metal chelator and ethylene glycol as esterification agent. PH maintained 5-6 during preparation of the sol. Sintering temperature of ceramic selected 1100°C. Preparation ceramics under these conditions and comparative analysis, the structure of ceramics is single perovskite and shap of crystals are square block. With the increase of x, properties of ceramics firstly increases and then decreases: d33, εr, Qm, Kpreaching the maximum, values of them were 136pC/N, 630(f =1KHz), 212, 0.41 respectively; dielectric loss to minimum is 0.07(f =1KHz); at this point, ceramics had best performance.

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Studies on Adsorption Performance of Reactive Dye Remazol Navy RGB (RN-RGB) via Epoxide Functional Magnetic ?-Al2O3 Nanocomposite Particles

Journal of Scientific Research ◽

10.3329/jsr.v9i4.32729 ◽

2017 ◽

Vol 9 (4) ◽

pp. 421-429

Author(s):

S. S. Bristy ◽

H. Ahmad

Keyword(s):

Sol Gel ◽

Reactive Dye ◽

Al2o3 Nanoparticles ◽

Silica Layer ◽

Seeded Polymerization ◽

Nanocomposite Particles ◽

Adsorption Performance ◽

Magnetite Fe3o4 ◽

Co Precipitation

The nanocomposite particles named as ?-Al2O3/Fe3O4/SiO2/poly(glycidyl methacrylate) or ?-Al2O3/Fe3O4/SiO2/PGMA were prepared by multi-step process. At first, ?- Al2O3 nanoparticles were prepared by sol-gel method. Magnetite, Fe3O4, nanoparticles were then precipitated by in situ co-precipitation in presence of ?-Al2O3 particles, followed by incorporation of mesoporous silica layer using Stöber process. Finally, the surface of the ?-Al2O3/Fe3O4/SiO2 nanocomposite particles was modified by seeded polymerization of GMA using free radical polymerization. The surface modification, morphology and size distribution of the prepared nanocomposite particles were confirmed by FTIR, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The adsorption capacity of ?-Al2O3/Fe3O4/SiO2/PGMA nanocomposite particles was evaluated using remazol navy RGB (RN-RGB) as a model dye.

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Synthesis and Intermolecularly Mediated Assembly of Organic Pigment in Hybrid Coating Films

MRS Proceedings ◽

10.1557/proc-519-103 ◽

1998 ◽

Vol 519 ◽

Author(s):

Y. Yan ◽

Z. Duan ◽

D.-G. Chen ◽

S. Ray Chaudhuri

Keyword(s):

Sol Gel ◽

Hybrid Coating ◽

Hypsochromic Shift ◽

Hybrid Films ◽

Coating Films ◽

Organic Pigment ◽

Inorganic Hybrid ◽

Matrix Interactions ◽

Sol Gel Process

AbstractThe insoluble, strongly hydrogen bonded organic pigment of 3,6-bis-(4-chlorphenyl)-l,4- diketopyrrolo [3,4-c] pyrrole was transiently blocked by adding carbamate groups, and consequently incorporated into organic-inorganic hybrid matrices by a sol-gel process. The homo- (pigment-pigment) and hetero-intermolecular (pigment-matrix) interactions were found to control both the assembly and dispersion of pigment molecules in the hybrid coating films. A weaker interaction between matrices and pigment molecules results in aggregation of the carbamate pigment in the methyl-silicate films. A stronger interaction forms a homogenous dispersion and coloration of the phenyl-silicate films. The as-prepared methyl- and phenylsilicate films doped with the organic pigment were distinguished by a morphology change and a blue (hypsochromic) shift in absorption from 550 to 460 nm. Thermal treatment can remove the carbamate groups and in-situ form the organic pigment in the hybrid films.

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