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Study on the preparation and friction properties of nano-bismuth

wallpapers News 2021-08-26
Preparation of bismuth nanoparticles
With the rise and development of nanotechnology, the basic research on the application of nano bismuth in the field of lubrication has been promoted, especially nanoparticles show excellent lubrication performance under harsh conditions, and some nanoparticles have a certain repair effect during the friction process. As well as environmentally friendly properties. In this paper, based on the research and development of environmentally friendly lubricant additives with excellent extreme pressure and anti-wear properties, the tribological properties of nano metals and their composite particles as lubricant additives are studied and discussed Its anti-wear and anti-friction action mechanism. Using OP-10 as the surfactant, n-pentanol as co-surfactant, cyclohexane as oil phase, reactant aqueous solution as water phase, and hydrazine hydrate (N2H4·H2O) as reduction The inverse microemulsion system of the agent successfully prepared nano-Bi particles and nano-Bi/Cu composite particles through transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet analysis (UV-Vis), and thermogravimetric analysis (TG-DTA). ) Test method to characterize the particle size and morphology of the synthesized nanoparticles. Stearic acid was used to modify the surface of nano-Bi particles and nano-Bi/Cu composite particles. The results showed that: The adsorption method is chemical adsorption, which makes the nanoparticles change from hydrophilic to lipophilic, and can be well wetted and dispersed by liquid paraffin. Stearic acid-modified nano bismuth powder and nano bismuth copper composite powder are used as lubricating oil additives in the four-ball wear test Tests of anti-wear and anti-friction performance on the machine have shown that both can effectively improve the anti-wear performance of the base oil, and the bearing capacity has also been significantly improved. Surface modified nano bismuth powder and bismuth copper composite powder in the base oil The best addition amount is 0.05 wt%. Compared with pure liquid paraffin, the wear scar diameter of the steel ball is reduced by 22.2% and 31.9%, respectively.
Study on the performance of nano-bismuth particles
Photocatalytic technology has been importantly applied in the field of environmental purification, and has received extensive attention from governments and scientific and technological workers in various countries, and has become a hot spot in sewage treatment research. Most photocatalysts have low quantum efficiency and a narrow spectral response range (usually can only be excited by ultraviolet light) in application research, resulting in low photocatalytic activity. This thesis takes bismuth-based semiconductor photocatalytic materials as the research object and prepares new high-efficiency bismuth-based photocatalysts with different morphologies through synthesis process design. The surface modification and other aspects of research. The research work of this dissertation includes the following four parts: In Chapter 1, we review the current research status of semiconductor nano bismuth at home and abroad, and introduce in detail the photocatalysis principle of semiconductor photocatalysts and the catalytic mechanism of photocatalysts doped with precious metals; at the same time; The methods of preparing and synthesizing nano-photocatalysts and their characterization methods are summarized. Finally, the research status of bismuth-based nano-photocatalysts and the research significance of this thesis are described. In Chapter 2, we used a surfactant as a template one-step hydrothermal method and successfully prepared a bismuth silicate (BSO) nanobelt/nanosheet photocatalyst for the first time. The synthesized BSO sample was characterized by XRD, TEM, HRTEM, BET, DRS. The results indicate that the surfactant CTAB is used as a structure-directing agent, and its concentration changes play a key role in the formation of the crystal phase and morphology of the BSO nanoribbons/nanosheets; the samples are degraded by rhodamine B and phenol under simulated sunlight. The needles showed better photocatalytic activity.

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