Investigations into sol-gel silica and silica hybrid coatings for dielectromagnetic soft magnetic composite applications

Pang, Yongxin; Hodgson, Simon; Węgliński, B.; Gaworska, D.

doi:10.1007/s10853-006-0360-9

Cited by 29 publications

(16 citation statements)

References 10 publications

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“…FT‐IR spectra of films prepared by coating the BTES‐Ac‐a and BTES‐Ac‐b sols on silicon wafer, followed by calcination at various temperatures are shown in Figure . The CH stretching bands at 2800–3000 cm −1 of the monomers were weakened by the gel formation, indicating the hydrolysis of ethoxy groups . At the same time, broad and intense bands ascribed to SiO and OH stretching appeared around 1100 and 3400 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 95%

“…To investigate the mechanism of the decomposition of BTES‐Ac‐a on contact with water during RO measurements, a BTES‐Ac‐a film was prepared on silicon wafer and soaked in water for 24 h. The FT‐IR spectrum after soaking (Figure ) showed slight increases of the OH and SiOH vibration bands at approximately 3450 and 950 cm −1 , respectively . However, no other clear changes were seen between the spectra before and after soaking.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of organically bridged trialkoxysilanes bearing acetoxymethyl groups and applications to reverse osmosis membranes

Yamamoto

Ohshita

Mizumo

et al. 2016

Applied Organom Chemis

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New bridged trialkoxysilanes bearing acetoxymethyl groups were synthesized by double hydrosilylation of 1,6‐diacetoxy‐2,4‐butadiyne, using two equivalents of triethoxysilane and a metal catalyst. With a Ru catalyst, the reaction proceeded via anti‐addition to provide BTES‐Ac‐a as a single isomer, while a similar reaction with a Pt or Rh catalyst provided an isomeric mixture of syn‐adducts BTES‐Ac‐b. Reverse osmosis (RO) silica membranes were prepared by the sol–gel process with BTES‐Ac‐a and BTES‐Ac‐b and the membranes were examined with respect to water desalination using a 2000 ppm NaCl aqueous solution. NaCl rejection of the membranes increased to reach 96% at the early stage of the RO experiments. However, the rejection decreased gradually to 85% after 70 and 200 h for BTES‐Ac‐a and BTES‐Ac‐b, respectively, due to hydrolytic decomposition of the silica network during the experiments. In contrast, a membrane prepared from copolymerization of BTES‐Ac‐a with ethane‐bridged bistrialkoxysilane (BTES‐E1) showed improved stability towards hydrolysis with stable NaCl rejection of 96% with higher water permeance (3.5 × 10−13 m3 m−2 s−1 Pa−1) than that of a membrane prepared by homopolymerization of BTES‐E1 (2.7 × 10−14 m3 m−2 s−1 Pa−1) reported previously.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Synthesis of organically bridged trialkoxysilanes bearing acetoxymethyl groups and applications to reverse osmosis membranes

Yamamoto

Ohshita

Mizumo

et al. 2016

Applied Organom Chemis

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“…This can be attributed to the loss of organic groups from the dielectric. FTIR/DTA Studies carried out on silica hybrid materials reported elsewhere [12,13], indicate that the methyl group in these systems is stable up to approximately 500 1C, at which point pyrolysis of the organic group occurs and largely completes by 600 1C.…”

Section: (A)-(c)mentioning

confidence: 88%

The influence of the dielectric on the properties of dielectromagnetic soft magnetic composites. Investigations with silica and silica hybrid sol–gel derived model dielectric

Pang

Hodgson

Koniarek

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…Among these properties, low core loss is most desirable for high-frequency applications. Insulation coating serves as an important procedure in the preparation of the SMCs for increased electrical resistivity and reduced core loss [3][4][5]. Both organic and inorganic materials have been used as the insulation coating for the SMCs.…”

Section: Introductionmentioning

confidence: 99%

“…Both organic and inorganic materials have been used as the insulation coating for the SMCs. Despite the good adhesion and flexibility of the organic coatings, most of them such as epoxy and phenolic resin exhibit poor resistance against high temperature (above 200°C) [5][6][7]. This limits the temperature used for the post-annealing process and hinders complete relaxation of the internal stress introduced by ball milling and compaction procedures [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation on sol–gel Al2O3 and hybrid phosphate-alumina insulation coatings for FeSiAl soft magnetic composites

Liu

Yan

2015

J Mater Sci

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Alumina has been prepared by sol-gel method as the coating layer in the fabrication of FeSiAl soft magnetic composites (SMCs). Influence of the Al 2 O 3 content on the magnetic properties of the SMCs has been studied, and optimized effective permeability (l e = 116.3) and core loss (P cv = 331.2 mW cm -3 ) measured at 50 kHz, 100 mT was achieved with 0.8 wt% Al 2 O 3 . Hybrid phosphate-alumina coating has also been used to prepare the FeSiAl SMCs with a total addition of 0.8 wt%. Significantly improved performance of the SMCs can be achieved with the hybrid coating compared to single phosphate or alumina coating. The addition of 0.2 wt% H 3 PO 4 and 0.6 wt% Al 2 O 3 gives rise to the optimal magnetic properties (l e = 123.4; P cv = 226.4 mW cm -3 ) of the FeSiAl SMCs. For the hybrid coating, the inner phosphate layer grown by direction reaction at the powder surfaces gives rise to excellent adhesion. Also, investigation on the thermal stability of the coatings indicates that the outer Al 2 O 3 layer hinders the decomposition of the phosphate layer, leading to enhanced magnetic performance of the SMCs.

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Investigations into sol-gel silica and silica hybrid coatings for dielectromagnetic soft magnetic composite applications

Cited by 29 publications

References 10 publications

Synthesis of organically bridged trialkoxysilanes bearing acetoxymethyl groups and applications to reverse osmosis membranes

Synthesis of organically bridged trialkoxysilanes bearing acetoxymethyl groups and applications to reverse osmosis membranes

The influence of the dielectric on the properties of dielectromagnetic soft magnetic composites. Investigations with silica and silica hybrid sol–gel derived model dielectric

Investigation on sol–gel Al2O3 and hybrid phosphate-alumina insulation coatings for FeSiAl soft magnetic composites

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