scholarly journals The Isoelectric Point and the Surface Charge of Barium Titanate Nanoparticles/Graphene Oxide Determined Using the Electrophoretic Mobility Technique

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
Vuong Thi Vy Anh ◽  
Nguyen Thi Dung ◽  
Chu Ngoc Chai ◽  
Phan Thi Tuyet Mai ◽  
Nguyen Xuan Hoan
Keyword(s):  
Graphene Oxide ◽  
Composite Materials ◽  
Barium Titanate ◽  
Electrophoretic Mobility ◽  
Potential Measurement ◽  
Tetragonal Crystal ◽  
Particles Size Distribution ◽  
Barium Titanate Nanoparticles ◽  
The Stability ◽  
Batio3 Nanoparticles

Barium titanate nanopowders, and composite materials of barium titanate/ graphene oxide (10 wt.% of graphene oxide according to the initial composite composition) were synthesized by hydrothermal method at the fixed reaction condition of 200 oC and 24 hours. The obtained powders were characterized by different techniques: X-ray diffraction, FTIR spectroscopy, Particles size distribution, and Scanning electron microscopy. Zeta potential measurement under electrophoretic mobility technique was also employed to investigate the stability of the BaTiO3 nanoparticles and composite materials of barium titanate/graphene oxide. The results showed that the BaTiO3 present with the tetragonal crystal structure (P4mm, a = 4.0000 Å, c = 4.0109 Å) and has uniform morphology with the grain sizes are in the range of 70 - 140 nm. The BaTiO3 nanoparticles were well distribution and covered on a surface of graphene oxide. The BaTiO3 nanoparticles, and BaTiO3/graphene oxide are stable in alkali, neutral media, and acidic media up to pH ~ 5.

Crystallinity of Barium Titanate Nanoparticles Synthesized by Sol-Gel Method

2007 ◽  
Vol 350 ◽  
pp. 31-34 ◽  
Author(s):  
Teruhisa Makino ◽  
Masashi Arimura ◽  
Kunitaka Fujiyoshi ◽  
Yoko Yamashita ◽  
Makoto Kuwabara
Keyword(s):  
Barium Titanate ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Scanning Calorimetry ◽  
Synthesis Conditions ◽  
Sol Gel Process ◽  
Aging Conditions ◽  
Barium Titanate Nanoparticles ◽  
Batio3 Nanoparticles

We synthesized barium titanate (BaTiO3) nanoparticles by sol-gel process and investigated their crystallization behavior using differential scanning calorimetry and X-ray diffraction. BaTiO3 nanoparticles with various degrees of crystallinity were obtained by adjusting synthesis conditions. Under aging conditions that do not allow dealcholization reaction to complete, many hydroxyl ligands remain in as-synthesized BaTiO3 nanoparticles, resulting in the formation of voids or defects in the nanoparticles after calcination. It is essential to use high concentration alkoxides precursor solutions for producing BaTiO3 nanoparticles with high crystallinity at low temperature.

Particle Structure Analysis of Highly-Dispersed Barium Titanate Nanoparticles Obtained from Barium Titanyl Oxalate Nanoparticles and their Dielectric Properties

2009 ◽  
Vol 421-422 ◽  
pp. 506-509 ◽  
Author(s):  
Shuhei Kondo ◽  
Chikako Moriyoshi ◽  
Yoshihiro Kuroiwa ◽  
Satoshi Wada
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
Layer Thickness ◽  
Rietveld Analysis ◽  
Particle Structure ◽  
Maximum Dielectric Constant ◽  
Barium Titanyl Oxalate ◽  
Barium Titanate Nanoparticles ◽  
Titanyl Oxalate ◽  
Batio3 Nanoparticles

Barium titanate (BaTiO3) nanoparticles were prepared by two-step thermal decomposition method of barium titanyl oxalate nanoparticles with a size of 30 nm. The BaTiO3 particle sizes were changed from 12.3 to 142 nm by control of temperature at 2nd step. The X-ray diffraction (XRD) measurement revealed that a clear splitting of 002 and 200 planes was observed over 40 nm, and the c/a ratio of 1.0089 was obtained for the BaTiO3 nanoparticles with a size of 62.3 nm. This high c/a ratio in the BaTiO3 nanoparticles suggested that its mesoscopic particle structure was composed of very thin surface cubic layer below 5 nm. Thus, synchrotron XRD data were analyzed using a “two layers” model and a “three layers” model. The Rietveld analysis using the three layers model resulted in the particle structure with a cubic layer thickness of 2.5 nm and structure gradient layer thickness of 7.5 nm. Finally, the dielectric constant of these BaTiO3 nanoparticles with thin surface cubic layer was measured at room temperature, and the maximum dielectric constant over 30,000 was obtained at the nanoparticles with a size of 83.6 nm.

scholarly journals Design and Construction of Capacitors with the Use of Nano-Barium Titanate’s (BaTiO3) Composite Materials

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
P. N. Nikolarakis ◽  
I. A. Asimakopoulos ◽  
L. Zoumpoulakis
Keyword(s):  
Composite Materials ◽  
Barium Titanate ◽  
Dielectric Material ◽  
Electrical Energy ◽  
Ferroelectric Material ◽  
Sensors And Actuators ◽  
Thermosetting Polymers ◽  
Passive Filters ◽  
Different Types ◽  
Barium Titanate Nanoparticles

The basic idea of this work, from the beginning of the laboratory work till now, is to develop innovative polymer composite materials using nanoparticles that can polarize in such a way that electrical energy can be stored. A number of thermosetting polymers have been laboratory-polymerized and then mixed with barium titanate nanoparticles, in order to develop new polymer nanocomposites. Barium titanate is a well-known dielectric material, which is used in sensors and actuators as it is a piezoelectric and ferroelectric material. In this work, we examine the storage capability between different types of such composites by creating passive filters.

Size Dependence of Dielectric Properties for Barium Titanate Nanoparticles Prepared under Various Vacuum Atmospheres

2006 ◽  
Vol 320 ◽  
pp. 139-142 ◽  
Author(s):  
Satoshi Wada ◽  
Masanori Ohishi ◽  
Kayo Takizawa ◽  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
Fine Particles ◽  
Particle Growth ◽  
Dielectric Measurement ◽  
High Particle ◽  
Heat Treated ◽  
Barium Titanyl Oxalate ◽  
Barium Titanate Nanoparticles ◽  
Batio3 Nanoparticles

Barium titanate (BaTiO3) fine particles were prepared using the 3-step thermal decomposition method of barium titanyl oxalate under various vacuum atmospheres. In this method, the first two steps prepared BaTiO3 nanoparticles with 30 nm, and at the 3rd step, BaTiO3 nanoparticles were heat-treated at various temperature and degree of vacuum. As a result, as degree of vacuum is high, particle size of BaTiO3 fine particles decreased. Moreover, the dielectric constant of BaTiO3 fine particles was measured using the powder dielectric measurement method with slurry. The dielectric constant of these particles showed the dielectric maximum of 4,320 at 200 nm despite degree of vacuum. This result revealed that degree of vacuum during particle growth of BaTiO3 particles had no relation about dielectric constant.

Dielectric Measurement for Barium Titanate Nanoparticles Using Far Infrared Reflection Method

2007 ◽  
Vol 350 ◽  
pp. 47-50 ◽  
Author(s):  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Satoshi Wada
Keyword(s):  
Dielectric Constant ◽  
Barium Titanate ◽  
High Dielectric Constant ◽  
Far Infrared ◽  
Dielectric Measurement ◽  
Reflection Method ◽  
Infrared Reflection ◽  
Barium Titanate Nanoparticles ◽  
High Dielectric ◽  
Batio3 Nanoparticles

Barium titanate (BaTiO3) nanoparticles with various particle sizes from 20 to 430 nm were prepared using a 2-step thermal decomposition method. Powder dielectric measurement clarified that dielectric constant of BaTiO3 particles with 140 nm exhibited a maximum around 5,000. To explain this high dielectric constant, THz-region dielectric properties of BaTiO3 nanoparticles, especially Slater transverse optic (TO) mode frequency, were estimated using the far infrared (FIR) reflection method. As the result, it was found that the Slater TO mode of BaTiO3 particles with 140 nm exhibited a minimum. Therefore, the high dielectric constant around 5,000 at 140 nm can be originated from the softening of the Slater TO mode.

scholarly journals Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 70
Author(s):  
Maria Raposo ◽  
Carlota Xavier ◽  
Catarina Monteiro ◽  
Susana Silva ◽  
Orlando Frazão ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Layer By Layer ◽  
Film Stability ◽  
A Value ◽  
Device Reliability ◽  
Sensor Devices ◽  
Lbl Films ◽  
The Stability

Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

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