Thin‐Oxide Dielectric Strength Improvement by Adding a Phosphonic Acid Chelating Agent into  NH 4 OH  ‐  H 2 O 2 Solution

1994 ◽  
Vol 141 (10) ◽  
pp. L139-L142 ◽  
Author(s):  
Hideo Akiya ◽  
Shuji Kuwano ◽  
Tohru Matsumoto ◽  
Hisashi Muraoka ◽  
Manabu Itsumi ◽  
...  
Keyword(s):  
Phosphonic Acid ◽  
Chelating Agent ◽  
Dielectric Strength ◽  
Thin Oxide ◽  
Strength Improvement

scholarly journals Dielectric Strength Improvement of Natural Ester Insulation Oil via Mixed Antioxidants: Taguchi Approach

2017 ◽  
Vol 7 (2) ◽  
pp. 650 ◽  
Author(s):  
Sharin Ab Ghani ◽  
Zulkarnain Ahmad Noorden ◽  
Nor Asiah Muhamad ◽  
Hidayat Zainuddin ◽  
Muhammad Ilman Hakimi Chua Abdullah ◽  
...  
Keyword(s):  
Oxidative Stability ◽  
Breakdown Voltage ◽  
Dielectric Strength ◽  
Taguchi Approach ◽  
Electrode Gap ◽  
Validation Test ◽  
Designed Experiment ◽  
Optimum Response ◽  
Natural Ester ◽  
Strength Improvement

<span lang="EN-US">Recently, natural ester insulation (NEI) oils are found to be the best candidates to replace mineral-based insulation oils for oil-immersed transformer applications. However, NEI oils are prone to oxidation due to their poor oxidative stability which can be improved by adding antioxidants into the oils. Latest studies have also shown that the use of selected antioxidants improves the AC breakdown voltage (BdV) of NEI oils. However, the experiments in previous studies were designed using the conventional one-factor-at-a-time (OFAT) method, which requires a large number of samples to be tested in order to determine the optimum response. Thus, a Taguchi-based designed experiment is introduced in this study in replacement of the OFAT method. It is found that this method is capable of determining the optimum concentrations of propyl gallate (PG) and citric acid (CA) which will maximize the AC BdV and improve the oxidative stability of the NEI oil. An AC breakdown voltage test is conducted in accordance with the ASTM D1816 standard using Megger OTS60PB portable oil tester, in which the electrode gap distance is kept fixed at 1 mm. The results indicate that the addition of PG and CA antioxidants increases the AC BdV of the rapeseed-based NEI oil. It is found that the optimum concentrations of PG and CA antioxidant is 0.05 and 0.25 wt.%, respectively. Lastly, the model developed in this study is analysed using analysis of variance (ANOVA). Validation test is also conducted on the optimized NEI oil to determine its dielectric strength and oxidative stability.</span>

Dielectric Strength Improvement by Higher Frequency AC Conditioning

2021 ◽  
Author(s):  
Ryota Konagi ◽  
Hiroki Kojima ◽  
Shinsuke Iitsuka ◽  
Masato Kobayashi ◽  
Naoki Hayakawa
Keyword(s):  
Dielectric Strength ◽  
Strength Improvement

Phosphonic Acid-Modified Barium Titanate Polymer Nanocomposites with High Permittivity and Dielectric Strength

2007 ◽  
Vol 19 (7) ◽  
pp. 1001-1005 ◽  
Author(s):  
P. Kim ◽  
S. C. Jones ◽  
P. J. Hotchkiss ◽  
J. N. Haddock ◽  
B. Kippelen ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Polymer Nanocomposites ◽  
Phosphonic Acid ◽  
Dielectric Strength ◽  
High Permittivity

High performance polymer/BaTiO3 nanocomposites based on surface-modified metal oxide nanoparticles using functional phosphonic acids for electronic applications

2008 ◽  
Vol 1113 ◽  
Author(s):  
Philseok Kim ◽  
Natalie M. Doss ◽  
John P. Tillotson ◽  
Xiao-Hong Zhang ◽  
Simon C. Jones ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Metal Oxide ◽  
Phosphonic Acid ◽  
Volume Fraction ◽  
Metal Oxide Nanoparticles ◽  
Dielectric Strength ◽  
Oxide Nanoparticles ◽  
High Quality ◽  
Nanocomposite Thin Films

ABSTRACTPolymer/ceramic nanocomposites provide a means of combining the high permittivities (εr) of metal oxide nanoparticles with the solution-processability and high dielectric strength of polymeric hosts. Simple mixing of nanoparticles and polymers generally results in poor quality nanocomposites due to the agglomeration of nanoparticles and poor miscibility of nanoparticles with host materials. We have shown that surface modification of metal oxide nanoparticles with phosphonic acid-based ligands affords robust surface modification and improves the processiblity and the quality of the resulting nanocomposites. We report on the use of phosphonic-acid modified barium titanate (BaTiO3, BT) nanoparticles in dielectric nanocomposites and their applications to high-energy-density capacitors and solution-processable high permittivity gate insulators in organic field-effect transistors (OFETs). Surface modification of BT nanoparticles enabled the formation of high quality nanocomposite thin films with ferroelectric polymer hosts such as poly(vinylidene fluoride-co-hexafluoropropylene), P(VDF-HFP), with large volume fractions (up to 50 vol. %), which are potentially useful materials for electrical energy storage. Similarly, the use of phosphonic acid-modified BT nanoparticles in cross-linked poly(4-vinylphenol) (PVP) allowed to form gate insulators for OFETs. High quality nanocomposite thin films at high nanoparticle volume fractions (up to 37 vol. %) with a large capacitance density (∼50 nF/cm2) and a low leakage current (10−8 A/cm2) were obtained. Pentacene-based p-type OFETs using these nanocomposites showed a large on/off current ratio (Ion/off 104 ∼ 106). We will also present the results from a recent experimental and theoretical study where the BT nanoparticle volume fraction was systematically varied in P(VDF-HFP) host, εr = 11, to find the optimum permittivity and dielectric strength, which provided a guideline for the optimization of the volume fraction for achieving maximum energy density.

Sign in / Sign up

Export Citation Format

Share Document