Low-Friction Coatings of Zinc Oxide Synthesized by Optimization of Crystal Preferred Orientation

Goto, Masahiro; Kasahara, Akira; Tosa, Masahiro

doi:10.1007/s11249-011-9792-8

Cited by 20 publications

(9 citation statements)

References 13 publications

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“…In particular, zinc oxide has been used in many areas, such as catalysis, 14 - 16 gas sensors, 17 and recently as lubricants. 18 - 19 In our previous study we showed that ZnO nanoparticles coating of stainless steel archwires decreased friction during sliding within stainless steel brackets. 20 In another research, we tried to decrease friction between stainless steel wires and ceramic brackets by depositing ZnO nanoparticles on the wires but we found no significant differences between coated and uncoated wires.…”

Section: Introductionmentioning

confidence: 98%

The effect of ZnO nanoparticle coating on the frictionalresistance between orthodontic wires and ceramic brackets

Behroozian¹,

Kachoei²,

Khatamian³

et al. 2016

J Dent Res Dent Clin Dent Prospects

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Background. Any decrease in friction between orthodontic wire and bracket can accelerate tooth movement in the sliding technique and result in better control of anchorage. This study was carried out to evaluate frictional forces by coating orthodontic wires and porcelain brackets with zinc oxide nanoparticles (ZnO).Methods. In this in vitro study, we evaluated a combination of 120 samples of 0.019×0.025 stainless steel (SS) orthodonticwires and 22 mil system edgewise porcelain brackets with and without spherical zinc oxide nanoparticles. Spherical ZnOnanoparticles were deposited on wires and brackets by immersing them in ethanol solution and SEM (scanning electronmicroscope) evaluation confirmed the presence of the ZnO coating. The frictional forces were calculated between the wiresand brackets in four groups: group ZZ (coated wire and bracket), group OO (uncoated wire and bracket), group ZO (coatedwire and uncoated bracket) and group OZ (uncoated wire and coated bracket). Kolmogorov-Smirnov, Mann-Whitney andKruskal-Wallis tests were used for data analysis.Results. The frictional force in ZZ (3.07±0.4 N) was the highest (P <0.05), and OZ (2.18±0.5 N) had the lowest amount of friction (P <0.05) among the groups. There was no significant difference in frictional forces between the ZO and OO groups (2.65±0.2 and 2.70±0.2 N, respectively).Conclusion. Coating of porcelain bracket surfaces with ZnO nanoparticles can decrease friction in the sliding technique,and wire coating combined with bracket coating is not recommended due to its effect on friction.

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Section: Introductionmentioning

confidence: 98%

The effect of ZnO nanoparticle coating on the frictionalresistance between orthodontic wires and ceramic brackets

Behroozian¹,

Kachoei²,

Khatamian³

et al. 2016

J Dent Res Dent Clin Dent Prospects

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show abstract

“…1). In this method, various time intervals (10,15,20,30,40,50, and 60 min) were chosen for coating the wires with ZnO nanoparticles. Coating of ZnO nanoparticle was confirmed by SEM images of the wires (Fig.…”

Section: Wet Chemical Synthesis Of Zno Nanoparticlementioning

confidence: 99%

“…[10] Before the application of the coated metallic wires and brackets, the biocompatibility and safety of the nanoparticles should be evaluated. Biocompatible nanomaterials especially zinc oxide nanoparticles, have been used in many areas such as in catalysis [11][12][13] , in gas sensors [14] , and recently as lubricants [15,16] . Complementarily, these nanoparticles have an added advantage of possessing antibacterial properties.…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of the orthodontic wire’s friction coated with zinc oxide nanoparticles by two methods of chemical precipitation and hydrothermal process

Tanbakuchi¹,

Kharrazi²,

Nikfarjam³

et al. 2022

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Introduction: In orthodontic treatment with sliding technique, reduction of frictional forces could result in a more effective treatment. Recently, wire coating with nanoparticles were proposed to reduce frictional forces. Aim: The aim of this study was to evaluate the effect of coating wires with zinc oxide nanoparticle by two methods of chemical precipitation and direct hydrothermal process on the wire-bracket frictional force. Materials and methods: In this study, 30 pieces of stainless-steel arch wire with and without zinc oxide nanoparticles and 30 metal brackets with a 0.022-inch slot were divided into three groups: group 1 – control (uncoated wires); group 2 – wires coated with zinc oxide nanoparticles, and group 3 – wires with a thin layer of nanostructured zinc oxide. In the first method, the nanoparticles were made by chemical precipitation method, and in the second method, nanostructure was directly formed on wires. Additionally, SEM observations were used to confirm the presence of nanoparticles on the wires. Friction between wires and brackets was measured using Universal Testing Machine. SPSS v. 20 and ANOVA test was used in order to analyze the data. The significance level was considered as p<0.05. Results: The mean value of frictional forces were 1.73 N, 1.52 N, and 1.56 N in the control group, chemical precipitation method group and thin layer of nanostructured zinc oxide group, respectively. There was no significant difference in friction rate between brackets and stainless-steel wire coated by any of these two methods (p=0.555). Conclusion: Coating of orthodontic wires with zinc oxide nanoparticles can reduce friction with brackets during sliding. There was no difference in the established value of friction between coating of orthodontic wires with chemical precipitation method and thin layer coating method.

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“…Nitrogen in particular has been extensively used for reducing the grain size of ZnO. For most oxides, epitaxial growth along the (0001) plane generates the lowest friction coefficient as it has the lowest energy of all the possible crystallographic orientations, which is also known to reduce friction [ 178 , 179 ]. The addition of noble metals such as silver and gold also causes these metals to precipitate along the grain boundary thus strengthening the grain boundaries.…”

Section: Ceramics In Tribology Researchmentioning

confidence: 99%

Tribological Properties of 2D Materials and Composites—A Review of Recent Advances

2021

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This paper aims to provide a theoretical and experimental understanding of the importance of novel 2D materials in solid-film lubrication, along with modulating strategies adopted so far to improve their performance for spacecraft and industrial applications. The mechanisms and the underlying physics of 2D materials are reviewed with experimental results. This paper covers some of the widely investigated solid lubricants such as MoS2, graphene, and boron compounds, namely h-BN and boric acid. Solid lubricants such as black phosphorus that have gained research prominence are also discussed regarding their application as additives in polymeric materials. The effects of process conditions, film deposition parameters, and dopants concentration on friction and wear rate are discussed with a qualitative and quantitative emphasis that are supported with adequate examples and application areas and summarized in the form of graphs and tables for easy readability. The use of advanced manufacturing methods such as powder metallurgy and sintering to produce solid lubricants of superior tribological performance and the subsequent economic gain from their development as a substitute for liquid lubricant are also evaluated.

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Low-Friction Coatings of Zinc Oxide Synthesized by Optimization of Crystal Preferred Orientation

Cited by 20 publications

References 13 publications

The effect of ZnO nanoparticle coating on the frictionalresistance between orthodontic wires and ceramic brackets

The effect of ZnO nanoparticle coating on the frictionalresistance between orthodontic wires and ceramic brackets

Comparative assessment of the orthodontic wire’s friction coated with zinc oxide nanoparticles by two methods of chemical precipitation and hydrothermal process

Tribological Properties of 2D Materials and Composites—A Review of Recent Advances

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