Surface OH groups governing surface chemical properties of SiO2 thin films deposited by RF magnetron sputtering

Takeda, Satoshi; Fukawa, Makoto

doi:10.1016/s0040-6090(03)01094-0

Cited by 33 publications

(33 citation statements)

References 10 publications

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“…The observed increasing trend is consistent with previous study [33]. The behavior of this system is associated with amount of surface OH species determined by X-ray photoelectron spectroscopy (XPS) reported by our group [23] and others (see for example [34]). …”

Section: Resultssupporting

confidence: 92%

Surface roughness analysis of hydrophilic SiO2/TiO2/glass nano bilayers by the level crossing approach

Daryaei

Tabar

Moshfegh

2013

Physica A: Statistical Mechanics and its Applications

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The effect of etching time on the statistical properties of the hydrophilic surface of SiO2/TiO 2 /Glass nano bi-layer has been studied using Atomic Force Microscopy (AFM) and stochastic approach based on the level crossing analysis. We have created a rough surface of the hydrophilic SiO 2 /TiO 2 nano bi-layer system by using 26% Potassium Hydroxide (KOH) solution.Measuring the average apparent contact angle assessed the degree of hydrophilicity and the optimum condition was determined at 10 min etching time. Level crossing analysis based on AF images provided deeper insight into the microscopic details of the surface topography. For different etching time, it has been shown that the average frequency of visiting a height with positive slope behaves Gaussian for heights near the mean value and obeys power law for the heights far away from the mean value. Finally, by applying the generalized total number of crossings with positive slope, it was found that the both high heights and deep valleys of the surface are extremely effective in hydrophilic degree of the SiO 2 /TiO 2 /Glass nano bi-layer investigated system.

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Section: Resultssupporting

confidence: 92%

Surface roughness analysis of hydrophilic SiO2/TiO2/glass nano bilayers by the level crossing approach

Daryaei

Tabar

Moshfegh

2013

Physica A: Statistical Mechanics and its Applications

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“…However, similarly high contact angles on silicon oxide surfaces were also reported in literature [16]. The variation in the wettability is commonly explained by difference in the preparation method and the altering of the surfaces properties by absorption of organic materials [16,17]. In this context, it is interesting to note that significantly smaller contact angles were measured on the silicon oxide covered pyramid structures than for smooth and crater-like structured samples with identical surface chemistry.…”

Section: Influence Of Structure On Wettabilitysupporting

confidence: 73%

Effect of nanoscale topography and chemical composition of surfaces on their microfrictional behaviour

Gerbig

Ahmed²,

Chetwynd

et al. 2006

Tribol Lett

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The influence of nanoscale topography and chemical composition on microfriction has been studied at different humidities. Structured surfaces exhibit lower friction than smooth ones. Among the structured surfaces, the crater-like morphologies show lower friction than pyramid-like morphologies. No significant differences in friction were observed when varying the roughness of the crater-like structures. On pyramid-like morphologies, friction increases with decreasing roughness. Additional hydrophobization of surface nanostructures results in only small reductions in friction.

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“…When we used X-ray photoelectron spectroscopy (XPS) to analyze the chemical species on the surfaces of the as-polished Ti, as-anodized Ti, and hydrothermally treated Ti samples processed at 453 K, the elements C, O, and Ti were detected on all the samples. In general, WCA is strongly related to the surface chemical species, such as OH groups and adsorbed hydrocarbon, each of which has the opposite effect on WCA [23,25]. The numbers of OH groups and amounts of adsorbed hydrocarbon on the as-polished Ti, the as-anodized Ti, and the hydrothermally treated Ti are shown in Figure 4.…”

Section: Effect Of Hydrothermal Treatment On Filmmentioning

confidence: 99%

Osteoconductivity of Superhydrophilic Anodized TiO<sub>2</sub> Coatings on Ti Treated with Hydrothermal Processes

Yamamoto

Arii²,

Kuroda³

et al. 2013

JBNB

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Surface hydrophilicity is considered to have a strong influence on the biological reactions of bone-substituting materials. However, the influence of a hydrophilic surface on osteoconductivity is not completely clear, especially for superhydrophilic surfaces. In this study, we conferred superhydrophilic properties on anodized TiO 2 coatings using a hydrothermal treatment, and developed a method to maintain this surface until implantation. The osteoconductivity of these coatings was evaluated with in vivo tests. A hydrothermal treatment made the surface of as-anodized samples more hydrophilic, up to a water contact angle of 13 (deg.). Storage in both air and distilled water increased the water contact angle after several days because of the adsorption of hydrocarbon. However, storage in phosphate buffered solution led to a reduction in the water contact angle, because of the adsorption of the inorganic ions in the solution, and the sample retained its high hydrophilicity for a long time. As the water contact angle decreased, the hard tissue formation ratio increased continuously up to 58%, which was about four times higher than the hard tissue formation ratio on as-polished Ti.

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Surface OH groups governing surface chemical properties of SiO2 thin films deposited by RF magnetron sputtering

Cited by 33 publications

References 10 publications

Surface roughness analysis of hydrophilic SiO2/TiO2/glass nano bilayers by the level crossing approach

Surface roughness analysis of hydrophilic SiO2/TiO2/glass nano bilayers by the level crossing approach

Effect of nanoscale topography and chemical composition of surfaces on their microfrictional behaviour

Osteoconductivity of Superhydrophilic Anodized TiO<sub>2</sub> Coatings on Ti Treated with Hydrothermal Processes

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Surface OH groups governing surface chemical properties of SiO2 thin films deposited by RF magnetron sputtering

Cited by 33 publications

References 10 publications

Surface roughness analysis of hydrophilic SiO2/TiO2/glass nano bilayers by the level crossing approach

Surface roughness analysis of hydrophilic SiO2/TiO2/glass nano bilayers by the level crossing approach

Effect of nanoscale topography and chemical composition of surfaces on their microfrictional behaviour

Osteoconductivity of Superhydrophilic Anodized TiO&lt;sub&gt;2&lt;/sub&gt; Coatings on Ti Treated with Hydrothermal Processes

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Osteoconductivity of Superhydrophilic Anodized TiO<sub>2</sub> Coatings on Ti Treated with Hydrothermal Processes