Porous, carbon-decorated LiFePO prepared by sol–gel method based on citric acid

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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Ethylene glycol-citric acid-silica hybrid organic-inorganic materials obtained by the sol-gel method

Journal of Sol-Gel Science and Technology ◽

10.1007/bf02436895 ◽

1997 ◽

Vol 8 (1-3) ◽

pp. 535-539 ◽

Cited By ~ 2

Author(s):

A. Campero ◽

Judith Cardoso ◽

S. Pacheco

Keyword(s):

Citric Acid ◽

Ethylene Glycol ◽

Sol Gel ◽

Inorganic Materials ◽

Gel Method ◽

Sol Gel Method ◽

Silica Hybrid

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Overview on the use of surfactants for the preparation of porous carbon materials by the sol-gel method: applications in energy systems

Reviews in Chemical Engineering ◽

10.1515/revce-2018-0056 ◽

2020 ◽

Vol 36 (7) ◽

pp. 771-787 ◽

Cited By ~ 1

Author(s):

Víctor Manuel Ortiz-Martínez ◽

Lucía Gómez-Coma ◽

Alfredo Ortiz ◽

Inmaculada Ortiz

Keyword(s):

Porous Structure ◽

Porous Carbon ◽

Carbon Materials ◽

Sol Gel ◽

Energy Systems ◽

Polymerization Reaction ◽

Gel Method ◽

Sol Gel Method ◽

Porous Carbon Materials ◽

Surfactant Assisted

AbstractPorous carbon materials attract great interest because of the wide range of applications in electrochemical energy systems, especially in the case of structured and porosity-tuned carbons prepared by template-assisted methods. The use of surfactant prevents the collapse of the porous structure during the air-drying stage in the sol-gel process, which is regarded as a critical stage in this method. This work offers an overview on the use of surfactants as templates for the manufacture of tunable porous carbon materials by the sol-gel method mainly using the polymerization reaction of resorcinol (R) and formaldehyde (F). The use of surfactants avoids the application of other economically disadvantaged drying techniques such as supercritical fluids and freeze-drying. The surfactant-assisted sol-gel methods reported in the literature for the fabrication of porous carbons are widely discussed, as well as the potentiality of the synthesized materials as electrodes in electrochemical systems, which greatly depends on the final porous structure. Besides, this work offers information on hybrid methods in which surfactants are used not only for the fabrication of porous carbon materials with mesoporous/microporous structure but also for the development of advanced structures and composites, including nanomaterials with enhanced properties. Finally, future prospects in the synthesis of carbon materials prepared by surfactant-assisted sol-gel method are presented.

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Study on the Synthesis of Batches of the System Y-Ba-Cu-O Using Sol-Gel Method

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.91.19 ◽

2014 ◽

Vol 91 ◽

pp. 19-23

Author(s):

Plamen Pashev ◽

Rositsa Raykova ◽

Yancho Hristov ◽

Bogdan Bogdanov

Keyword(s):

Particle Size ◽

Citric Acid ◽

Sol Gel ◽

Gel Method ◽

Sol Gel Method ◽

Blue Solution ◽

Transformation Processes ◽

Nitrate Solutions ◽

Thermally Treated

The study presented deal with preparation of batches of the system Y-Ba-Cu-O using sol-gel method and citric acid as precursor. Batches with particle size of 100 nm containing each of the phases Y123 and Y211 were prepared. The stoichiometric amounts of Y, Ba and Cu oxides were dissolved in 65% HNO3 until clear blue solution was observed under heating to 80 ̊С. The nitrate solutions obtained were neutralized to pH = 6 with 25% solution of NH3 (p.a.), then С6Н8О7 was added as the gels obtained were thermally treated. The transformation processes taking place under change of temperature were studied by IR, XRD, DTA and SEM.

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Effect of the annealing temperature and of Bi substitution on the structural and magnetic behaviors of double-doping (Bi/La, Ca) (La0.8Ca0.2)1−xBixFeO3 compounds

New Journal of Chemistry ◽

10.1039/d0nj01962c ◽

2020 ◽

Vol 44 (23) ◽

pp. 9813-9821

Author(s):

H. Issaoui ◽

A. Benali ◽

M. Bejar ◽

E. Dhahri ◽

R. F. Santos ◽

...

Keyword(s):

Citric Acid ◽

Curie Temperature ◽

Annealing Temperature ◽

Sol Gel ◽

Gel Method ◽

Sol Gel Method ◽

Double Doping

Perovskite (La0.8Ca0.2)1−xBixFeO3 compounds were synthesized by sol–gel method using the citric acid route and sintered at 800 °C and 900 °C. LCBFO 800 series has the smallest size of crystallites, a larger magnetization and a smaller Curie temperature.

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