Morphology Evolution of ZnO Submicroparticles Induced by Laser Irradiation and Their Enhanced Tribology Properties by Compositing with Al<sub>2</sub>O<sub>3</sub> Nanoparticles

Duan, Guangbin; Hu, Xilun; Song, Xiaoyun; Qiu, Zhiwen; Gong, Haibo; Cao, Bingqiang

doi:10.1002/adem.201400385

Cited by 15 publications

(11 citation statements)

References 40 publications

(35 reference statements)

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“…This condition may be a result of the nanocrystalline nature of the films as calculated by the Debye-Scherrer equation [12,13]. Our result is comparable to that obtained by using sub-microsphere ZnO particles and compositing sub-microsphere ZnO with Al 2 O 3 nanoparticles as lubricant additives studied by other authors [12,13,20]. Those authors also suggested that rolling friction became dominant instead of sliding friction, thereby causing the composite micro/ nanoparticles to squeeze into the grooves on the rubbing surfaces and reducing friction and wear.…”

Section: Friction and Wear Resultssupporting

confidence: 86%

“…Compositing ZnO and organic polymers has also been shown to improve tribological performance and thermal stability, as well as nanochemical properties [14][15][16][17][18][19]. Furthermore, in terms of lubricant additives, compositing ZnO submicrospheres with Al 2 O 3 nanoparticles had been shown to notably improve both the friction reduction and antiwear properties [20]. Such improved tribological properties were attributed to the fact that rolling friction became dominant instead of sliding friction, while the micro/nanoparticles squeezed into the grooves on the rubbing surfaces to reduce wear.…”

Section: Introductionmentioning

confidence: 99%

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Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

et al. 2017

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N-doped ZnO thin films were deposited on 304L stainless steel through the pyrolysis of zinc acetate and ammonium acetate in different ratios at a temperature of 420 °C using metal organic chemical vapor deposition. Compositional and structural analyzes of the films were performed by using Rutherford backscattering spectroscopy and X-ray diffraction. The frictional behavior of the thin films and 304L stainless steel substrate was evaluated using a ball-on-flat configuration with reciprocating sliding under marginally lubricated and fully flooded conditions. Al alloy (2017) was used as ball counterface, while basestock synthetic polyalfaolefin oil (PAO10) without additives was used as lubricant. The flat and ball counterface surfaces were examined to assess the wear dimension and failure mechanism. Under marginally lubricated condition, N-doped ZnO thin films provided significant reduction in friction, whereas the films have minimal or no effect in friction under fully flooded condition. N-doped ZnO thin films showed a significant effect in protecting the ball counterface as wear volume was reduced compared with that of the substrate under the marginally lubricated condition. Under the fully flooded condition, with the exception of one of the films, the wear volume of the N-doped ZnO thin films ball reduced compared with that of the substrate. In all the ball counterfaces for N-doped ZnO thin films under both conditions, wear occurred through abrasive mechanism of various degrees or mild polishing. Thus, superfluous lubrication of N-doped ZnO thin films is not necessary to reduce friction and wear.

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Section: Friction and Wear Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

et al. 2017

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“…Recently, the lubrication property of oil has been reported to be greatly improved by the addition of ceramic sub‐micrometer spherical particles fabricated by PLML . This finding is quite an interesting example of the utilization of the good mechanical properties and the sphericity of these particles.…”

Section: Introductionmentioning

confidence: 83%

High‐Strength Sub‐Micrometer Spherical Particles Fabricated by Pulsed Laser Melting in Liquid

Kondo

Shishido²,

Kamiya

et al. 2018

Part & Part Syst Charact

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nanostructures. However, these nanostructures have strongly anisotropic mechanical properties originated from their shapes. Furthermore, various nanocomposites using nanoparticles [3] or nanosheets [4] as fillers have been extensively studied because of their designable mechanical properties. However, direct studies on the mechanical properties of smaller 0D nanoparticles have been quite limited so far.Sub-micrometer spherical particles can be synthesized by applying pulsed laser irradiation onto raw colloidal nanoparticles dispersed in a liquid medium as a new type of 0D nanoparticles. This technique is referred to as pulsed laser melting in liquid (PLML). [5][6][7][8] In this process, raw nanoparticles are selectively heated and melted by unfocused pulsed laser irradiation to form droplets due to the temperature increase over the melting point. Raw nanoparticles are generally aggregated in liquid, and therefore aggregates merge into large sub-micrometersized droplets during instantaneous laser heating. Subsequently, generated droplets are quenched by the surrounding liquid to become highly crystalline nonporous sub-micrometer spherical particles. Sub-micrometer-sized particles are obtained due to the balance between the size-dependent optical absorption efficiency of particles and the heat capacity of the material to reach the melting point. [9,10] Using this technique, sub-micrometer spherical particles can be fabricated for various materials, such as metals, [11,12] oxides, [13,14] semiconductors, [15] and even carbides. [7,16] As commercially available sub-micrometer spherical particles are Sub-micrometer spherical particles that are obtained by pulsed laser melting in liquid (PLML) are usually observed to be single crystalline, and it is suggested that they are mechanically very strong. In this study, fracture tests of various sub-micrometer spherical particles are performed by compressive force application. The results indicate that B 4 C and TiO 2 sub-micrometer spherical particles exhibit brittle fracture behavior under tensile fracture mode at the center of the particles. The fracture strength of the sub-micrometer spherical particles is larger than that of the bulk material reported in the literature by about one order of magnitude. TiO 2 sub-micrometer spherical particles obtained by PLML are stronger than the commercially available TiO x sub-micrometer spherical particles with a porous structure. In addition, due to the single crystallinity of particles, smaller particles have larger fracture strength, becoming up to 10-40% of ideal tensile fracture strength calculated based on density functional theory. Thus, these results demonstrate that sub-micrometer spherical particles obtained using PLML exhibit fairly strong and unique mechanical properties, and therefore they are very promising for various mechanical applications at the sub-micrometer size scale. Fracture Strength AnalysisThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/ppsc.2018...

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“…Laser ablation offers a versatile platform that can simultaneously induce surface structures [1][2][3] and synthesize nanomaterials [4][5][6][7][8][9][10][11][12][13] for diverse applications, such as wettability control [14][15][16][17] , bioimaging 6,18 , cellular growth manipulation [19][20][21] , lithium-ion batteries 22 , surface enhanced Ra-man scattering (SERS) detection 23,24 , catalysis/ photocatalysis/electrochemical-catalysis 6,7,25 and antifriction [26][27][28][29] . Laser processing also enables the microfabrication of three-dimensional structures and devices 30,31 .…”

Section: Introductionmentioning

confidence: 99%

Hierarchical microstructures with high spatial frequency laser induced periodic surface structures possessing different orientations created by femtosecond laser ablation of silicon in liquids

Zhang¹,

Sugioka²

2019

Opto-Electronic Advances

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High spatial frequency laser induced periodic surface structures (HSFLs) on silicon substrates are often developed on flat surfaces at low fluences near ablation threshold of 0.1 J/cm 2 , seldom on microstructures or microgrooves at relatively higher fluences above 1 J/cm 2. This work aims to enrich the variety of HSFLs-containing hierarchical microstructures, by femtosecond laser (pulse duration: 457 fs, wavelength: 1045 nm, and repetition rate: 100 kHz) in liquids (water and acetone) at laser fluence of 1.7 J/cm 2. The period of Si-HSFLs in the range of 110-200 nm is independent of the scanning speeds (0.1, 0.5, 1 and 2 mm/s), line intervals (5, 15 and 20 μm) of scanning lines and scanning directions (perpendicular or parallel to light polarization direction). It is interestingly found that besides normal HSFLs whose orientations are perpendicular to the direction of light polarization, both clockwise or anticlockwise randomly tilted HSFLs with a maximal deviation angle of 50° as compared to those of normal HSFLSs are found on the microstructures with height gradients. Raman spectra and SEM characterization jointly clarify that surface melting and nanocapillary waves play important roles in the formation of Si-HSFLs. The fact that no HSFLs are produced by laser ablation in air indicates that moderate melting facilitated with ultrafast liquid cooling is beneficial for the formation of HSFLs by LALs. On the basis of our findings and previous reports, a synergistic formation mechanism for HSFLs at high fluence was proposed and discussed, including thermal melting with the concomitance of ultrafast cooling in liquids, transformation of the molten layers into ripples and nanotips by surface plasmon polaritons (SPP) and second-harmonic generation (SHG), and modulation of Si-HSFLs direction by both nanocapillary waves and the localized electric field coming from the excited large Si particles.

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Morphology Evolution of ZnO Submicroparticles Induced by Laser Irradiation and Their Enhanced Tribology Properties by Compositing with Al₂O₃ Nanoparticles

Cited by 15 publications

References 40 publications

Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

High‐Strength Sub‐Micrometer Spherical Particles Fabricated by Pulsed Laser Melting in Liquid

Hierarchical microstructures with high spatial frequency laser induced periodic surface structures possessing different orientations created by femtosecond laser ablation of silicon in liquids

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Morphology Evolution of ZnO Submicroparticles Induced by Laser Irradiation and Their Enhanced Tribology Properties by Compositing with Al2O3 Nanoparticles

Cited by 15 publications

References 40 publications

Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

Tribological behavior of N-doped ZnO thin films by metal organic chemical vapor deposition under lubricated contacts

High‐Strength Sub‐Micrometer Spherical Particles Fabricated by Pulsed Laser Melting in Liquid

Hierarchical microstructures with high spatial frequency laser induced periodic surface structures possessing different orientations created by femtosecond laser ablation of silicon in liquids

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Product

Resources

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Morphology Evolution of ZnO Submicroparticles Induced by Laser Irradiation and Their Enhanced Tribology Properties by Compositing with Al₂O₃ Nanoparticles