Submicron-Lubricant Based on Crystallized Fe<sub>3</sub>O<sub>4</sub> Spheres for Enhanced Tribology Performance

Song, Xiaoyun; Qiu, Zhiwen; Yang, Xiaopeng; Gong, Haibo; Zheng, Shuilin; Cao, Bingqiang; Wang, Hongqiang; Möhwald, Helmuth; Shchukin, Dmitry G.

doi:10.1021/cm502426y

Cited by 63 publications

(38 citation statements)

References 45 publications

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“…This physical growth process can simply described as a laser‐stimulated surface tension energy release (LSSTER) method. More discussion about the ZnO, TiO 2 , CuO, and Fe 3 O 4 spheres growth through LSSTER method can be found in our former paper . Typical high‐resolution TEM image shown in Figure f proves these ZnO spheres after laser irradiation are of single crystal with clean surface, which is also consisted with the former results of Wang et al …”

Section: Resultssupporting

confidence: 78%

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

Duan

Song

et al. 2014

Adv Eng Mater

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In this paper, ZnO submicrospheres are prepared by a simple laser-stimulated surface tension energy release strategy, which is a very convenient method for growing inorganic oxide spheres with high melting points. The detailed morphology evolution of ZnO particles is investigated by changing the laser fluence. The formation of spherical morphology is due to the particle spherizing and/or coalescence as a result of surface area minimum and release of surface tension energy when particles are heated by laser irradiation. ZnO submicrospheres can effectively reduce the friction coefficients when used as lubricating oil additives, which exhibit a clear morphology-dependent property. But the wear becomes worse due to its small hardness. However, the compositing ZnO submicrospheres with Al 2 O 3 nanoparticles as the lubricating oil additives can notably improve both the friction-reduction and anti-wear properties. The surface analysis of the thrust rings suggests that rolling friction becomes dominant instead of sliding friction and these composite particles squeezed into the grooves on the rubbing surfaces can reduce wear.

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Section: Resultssupporting

confidence: 78%

“…All of the prepared suspensions were centrifuged at 12 000 rpm after laser irradiation and then dried at 50 °C for further characterizations and applications. Al 2 O 3 nanoparticles were prepared by hydrothermal method according to our previous report …”

Section: Methodsmentioning

confidence: 99%

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

Duan

Song

et al. 2014

Adv Eng Mater

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“…As a result, educts with sizes in the range of 200~1000 nm can be directly reshaped into SMSs, similar to the previously reported LML-induced shape conversion57. The driving force of shape conversion from irregular powders to spherical particles is due to its smallest surface area among all surfaces at a given volume, that is, smallest surface energy for spherical particles61. Please note the limitation of the model used to create Fig.…”

Section: Discussionsupporting

confidence: 77%

Germanium Sub-Microspheres Synthesized by Picosecond Pulsed Laser Melting in Liquids: Educt Size Effects

Zhang

Lau

et al. 2017

Sci Rep

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Pulsed laser melting in liquid (PLML) has emerged as a facile approach to synthesize submicron spheres (SMSs) for various applications. Typically lasers with long pulse durations in the nanosecond regime are used. However, recent findings show that during melting the energy absorbed by the particle will be dissipated promptly after laser-matter interaction following the temperature decrease within tens of nanoseconds and hence limiting the efficiency of longer pulse widths. Here, the feasibility to utilize a picosecond laser to synthesize Ge SMSs (200~1000 nm in diameter) is demonstrated by irradiating polydisperse Ge powders in water and isopropanol. Through analyzing the educt size dependent SMSs formation mechanism, we find that Ge powders (200~1000 nm) are directly transformed into SMSs during PLML via reshaping, while comparatively larger powders (1000~2000 nm) are split into daughter SMSs via liquid droplet bisection. Furthermore, the contribution of powders larger than 2000 nm and smaller than 200 nm to form SMSs is discussed. This work shows that compared to nanosecond lasers, picosecond lasers are also suitable to produce SMSs if the pulse duration is longer than the material electron-phonon coupling period to allow thermal relaxation.

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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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Submicron-Lubricant Based on Crystallized Fe₃O₄ Spheres for Enhanced Tribology Performance

Cited by 63 publications

References 45 publications

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

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

Germanium Sub-Microspheres Synthesized by Picosecond Pulsed Laser Melting in Liquids: Educt Size Effects

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

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Submicron-Lubricant Based on Crystallized Fe3O4 Spheres for Enhanced Tribology Performance

Cited by 63 publications

References 45 publications

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

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

Germanium Sub-Microspheres Synthesized by Picosecond Pulsed Laser Melting in Liquids: Educt Size Effects

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

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Submicron-Lubricant Based on Crystallized Fe₃O₄ Spheres for Enhanced Tribology Performance

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

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