Simple “titanium alkoxide–water–solvent” solutions as titania coating solutions containing no peptizing or chelating agents

Piwluang, Thapanee; Hayashido, Takahiko; Koizumi, Yuta; Yamada, Takehito; Nishimura, Yuki; Kubota, Masumi; Kozuka, Hiromitsu

doi:10.1007/s10971-019-05088-y

Cited by 4 publications

(10 citation statements)

References 11 publications

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“…The single-pulse 1 H and 29 Si NMR spectra of precursor solutions were recorded with an NMR spectrometer (JNM-ECS300, JEOL). The pulse flip angle, relaxation delay, accumulation number, and measurement time were 45°, 5 s, 16, ³10 min, respectively, for 1 H spectra and 30°, 20 s, 22002300, ³13 h, respectively, for 29 Si spectra. To minimize 29 Si signals from sample tube a silica glass tube (5 mmº, SS-002, Shigemi) was used.…”

Section: General Formula Of Hydrolytic Polycondensation Of Tetraalkoxmentioning

confidence: 99%

“…The pulse flip angle, relaxation delay, accumulation number, and measurement time were 45°, 5 s, 16, ³10 min, respectively, for 1 H spectra and 30°, 20 s, 22002300, ³13 h, respectively, for 29 Si spectra. To minimize 29 Si signals from sample tube a silica glass tube (5 mmº, SS-002, Shigemi) was used. Solutions were measured directly without dilution with deuterated solvents; this procedure maximized 29 Si signals from sample solutions and avoided the modification of their conditions by dilution.…”

Section: General Formula Of Hydrolytic Polycondensation Of Tetraalkoxmentioning

confidence: 99%

“…To minimize 29 Si signals from sample tube a silica glass tube (5 mmº, SS-002, Shigemi) was used. Solutions were measured directly without dilution with deuterated solvents; this procedure maximized 29 Si signals from sample solutions and avoided the modification of their conditions by dilution. Although the deuterium field-frequency lock was unusable, resonance frequency was stable enough and its drift during measurements was negligible.…”

Section: General Formula Of Hydrolytic Polycondensation Of Tetraalkoxmentioning

confidence: 99%

“…A long pot life facilitates the storage and repeated use of surplus solutions, making this method more environmentally friendly. The pot life of coating solutions can be extended over a month by reducing water to alkoxide ratio 8),13),28), 29) and/or increasing solvent to alkoxide ratio. 25) However, relevant studies are still limited.…”

Section: Introductionmentioning

confidence: 99%

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Cosolvent-free sol–gel dip-coating of silica films from tetraalkoxysilane–water binary systems: precursor solutions of long pot life and their characterization by nuclear magnetic resonance spectroscopy

Kajihara

Hiruta

Kanamura

2020

J. Ceram. Soc. Japan

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Solutions derived by cosolvent-free (solventless) acid-catalyzed hydrolytic polycondensation of tetramethoxysilane (TMOS)water and tetraethoxysilane (TEOS)water binary systems were used to form silica films by dipcoating. Reactions in these solutions were examined by liquid-state 1 H and 29 Si nuclear magnetic resonance (NMR) spectroscopy, and the results were quantitatively analyzed based on a general reaction formula of tetraalkoxysilane deduced in this study. Transparent crack-free sintered silica films as thick as ³500 nm were obtained from the TEOS-based solutions aged at 80°C, and similar films were also prepared from solutions stored for 30 d at room temperature. Water molecules were nearly absent both in the TMOS and TEOS systems. Unreacted SiOH groups were depressed in the TMOS system whereas abundant in the TEOS system. These SiOH groups in the TEOS system are essential in producing uniform thin films as they render silica oligomers hydrophilic to increase affinity to glass substrates. Furthermore, they were inert and their slow polycondensation enables the extension of pot life. Films prepared from the TMOS system were non-uniform and cracked because the lack of residual SiOH groups impaired wettability to glass substrates and permitted the shrinkage of deposited liquid films before consolidation.

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Section: General Formula Of Hydrolytic Polycondensation Of Tetraalkoxmentioning

confidence: 99%

Section: General Formula Of Hydrolytic Polycondensation Of Tetraalkoxmentioning

confidence: 99%

Section: General Formula Of Hydrolytic Polycondensation Of Tetraalkoxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cosolvent-free sol–gel dip-coating of silica films from tetraalkoxysilane–water binary systems: precursor solutions of long pot life and their characterization by nuclear magnetic resonance spectroscopy

Kajihara

Hiruta

Kanamura

2020

J. Ceram. Soc. Japan

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“…In the progress of advanced technologies, thin oxide films are getting more and more important for various applications (e.g., semiconductors, separation, catalysis and chemical protection) [1][2][3][4][5]. A strong industrial interest is focused on the improvement of coatings for anticorrosion protection.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of phosphate-nickel-titanium composite coatings obtained by sol–gel process for corrosion protection

Chahine

Touhami

et al. 2020

SN Appl. Sci.

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New phosphorus-titanium-nickel composites were deposited on steel substrate by using sol gel spin coating technique for application as anticorrosion coatings. Along with the synthesis, the effects of annealing temperature and various number of coating layers on anticorrosion properties were looked into. The corrosion behavior of deposited and annealed coatings was evaluated by salt spray testing in a neutral mist (ASTM B117-85 NSS) of 5% NaCl at 35 °C for 300 h. Titanium tetra-isopropoxide, tri-methyl phosphate and Nickel (II) nitrate hexahydrate were used as precursors. To characterize the coatings and powder various techniques were used: Thermogravimetric Analysis coupled to Differential Scanning Calorimetry, Fourier Transform Infrared Spectroscopy, X-Ray Diffraction, Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray (EDX) analysis, Elemental Analysis ICP and X-ray photoelectron spectroscopy (XPS). The microstructure and elemental identification were done by SEM with EDX and XPS analysis. XPS analysis confirmed that Ti, Ni, P, and O elements are present in the surface. The functional groups were identified by FTIR analysis. Finally, steel plates coated with TiO 2-NiO-P 2 O 5 composite displayed satisfactory anticorrosion properties under simulated seawater environment. The results of the study revealed that the annealing temperature at 450 °C and after six layers had a great impact on the anticorrosion properties of 57.5TiO 2-12.5NiO-30P 2 O 5 composite.

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Isobaric vapour-liquid equilibrium of methanol + tetrahydrofuran + imidazolium-based ionic liquids at 101.3 kPa

Zhu

Sun

et al. 2020

Journal of Molecular Liquids

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Simple “titanium alkoxide–water–solvent” solutions as titania coating solutions containing no peptizing or chelating agents

Cited by 4 publications

References 11 publications

Cosolvent-free sol–gel dip-coating of silica films from tetraalkoxysilane–water binary systems: precursor solutions of long pot life and their characterization by nuclear magnetic resonance spectroscopy

Cosolvent-free sol–gel dip-coating of silica films from tetraalkoxysilane–water binary systems: precursor solutions of long pot life and their characterization by nuclear magnetic resonance spectroscopy

Preparation and characterization of phosphate-nickel-titanium composite coatings obtained by sol–gel process for corrosion protection

Isobaric vapour-liquid equilibrium of methanol + tetrahydrofuran + imidazolium-based ionic liquids at 101.3 kPa

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