Synthesis of hydrophobic zinc borate nanodiscs for lubrication

Tian, Yumei; Guo, Yupeng; Jiang, Man; Ye, Sheng; Bala, Hari; Zhang, Guangyu; Jiang, Yanqiu; Zhou, Bing; Wang, Zichen

doi:10.1016/j.matlet.2006.01.108

Cited by 85 publications

(44 citation statements)

References 29 publications

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“…8,9 For instance, Tian and co-workers produced zinc borate nanodiscs from borax and zinc sulfate in the presence of oleic acid as a modifying agent. 9 The produced nanodiscs were used as lubricating oil additive and they decreased friction coefficient value from 0.12 to 0.02. Nanoparticles agglomerate owing to the influence of interfacial tension during conventional drying.…”

Section: Introductionmentioning

confidence: 99%

Supercritical Carbon Dioxide Drying of Methanol−Zinc Borate Mixtures

Gönen

Balköse

Gupta

et al. 2009

Ind. Eng. Chem. Res.

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Supercritical carbon dioxide (CO 2 ) drying of zinc borate species was investigated to evaluate possible chemical alterations in the product during the drying. Methanol-wetted zinc borates produced either from borax decahydrate and zinc nitrate hexahydrate (2ZnO · 3B 2 O 3 · 7H 2 O) or from zinc oxide and boric acid (2ZnO · 3B 2 O 3 · 3H 2 O) were dried by both conventional and supercritical carbon dioxide drying methods. Zinc borate samples dried by both techniques were characterized using analytical titration, X-ray powder diffraction (XRD), thermo gravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, elemental analysis, and scanning electron microscopy (SEM). It was found that while zinc borate obtained from zinc oxide and boric acid did not have any chemical interaction with CO 2 , carbonates were formed on the surface of zinc borate obtained from borax decahydrate and zinc nitrate hexahydrate. The main factor for the carbonate formation during supercritical CO 2 drying is anticipated as the structural differences of zinc borate species. CO 2 is a nonpolar solvent, and it does not usually react with polar substances unless water is present in the medium. While 2ZnO · 3B 2 O 3 · 3H 2 O had three bound OH groups, 2ZnO · 3B 2 O 3 · 7H 2 O had five bound OH groups and one mole of water of crystallization. It is proposed that the water of crystallization reacts with CO 2 forming carbonic acid. Then, carbonic acid, which is stronger than boric acid, substitutes borate ions from their zinc salts.

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Section: Introductionmentioning

confidence: 99%

Supercritical Carbon Dioxide Drying of Methanol−Zinc Borate Mixtures

Gönen

Balköse

Gupta

et al. 2009

Ind. Eng. Chem. Res.

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“…The band at 3404 cm -1 is attributed to O-H stretching vibration [6]. The band at 1655 cm -1 is attributed to the H-O-H bending mode, which indicates that the compound contains the crystal water [1,2,6]. The band at 1390 and 986 cm -1 should be the asymmetric and symmetric stretching of B-O band [1,2].…”

Section: Methodsmentioning

confidence: 98%

“…The band at 1655 cm -1 is attributed to the H-O-H bending mode, which indicates that the compound contains the crystal water [1,2,6]. The band at 1390 and 986 cm -1 should be the asymmetric and symmetric stretching of B-O band [1,2]. As for OANLBs, the band at 1548 cm -1 is attributed to the existence of carboxylic acid salt in OA-capped lanthanum borate [18].…”

Section: Methodsmentioning

confidence: 98%

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Hydrothermal Synthesis, Characterization, and Tribological Behavior of Oleic Acid-Capped Lanthanum Borate with Different Morphologies

Jia

Xia

2010

Tribol Lett

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In this paper, nano/microstructure lanthanum borates were synthesized by hydrothermal route. Furthermore, oleic acid-capped nano/microstructure lanthanum borates (OANLBs) were also prepared. The nano/microstructure of lanthanum borate is characterized by means of Fourier transform-infrared spectroscopy (FT-IR), fieldemission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). At the same time, the friction and wear properties of OANLBs as additives in poly-alpha-olefin (PAO) were measured for AISI 1045 steel and laser treated AISI 1045 steel. Results show that the PAO containing OANLBs possesses much better tribological properties for steel/steel and steel/laser treated AISI 1045 steel sliding pairs than pure PAO.

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“…Previous work on the synthesis of zinc borate has included reaction of zinc salts and borate salts in hot water (C60°C), use of the ethanol supercritical fluid drying technique, and reaction of zinc oxide and boric acid [2,[7][8][9]. In this study, in contrast with previous studies, zinc borate was synthesized from zinc carbonate, as novel zinc source, with boric acid reference material, and with zinc borate reference material as seed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hydrophobic nanostructured zinc borate from zinc carbonate, and characterization of the product

2014

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In general, zinc oxide and boric acid are used to produce zinc borate. In this study, zinc carbonate was used instead of zinc oxide as the novel zinc source. The purpose of this study was to synthesize hydrophobic, nanostructured zinc borate (3ZnOÁ3B 2 O 3 Á3.5H 2 O) by reaction of zinc carbonate, instead of zinc oxide, with boric acid reference material, and with zinc borate reference material as seed. The modifying agents propylene glycol, kerosene, and oleic acid were used to produce hydrophobic zinc borate. Different solvents (isopropyl alcohol, ethanol, and methanol) were used to obtain a homogeneous phase. The effects of different modifying agents and solvents on the hydrophobicity and nanostructure of the product were investigated. The synthesized zinc borate was characterized by X-ray diffraction and Fourier-transform infrared spectroscopy. Contact angles were measured to determine the hydrophobicity of the products and scanning electron microscopy was used to study both the morphology and nanostructure of the products. Hydrophobic, nanostructured zinc borate was successfully produced by use of zinc carbonate instead of zinc oxide as the novel zinc source. Use of different modifying agents and solvents affected both hydrophobicity and nanostructure.

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Synthesis of hydrophobic zinc borate nanodiscs for lubrication

Cited by 85 publications

References 29 publications

Supercritical Carbon Dioxide Drying of Methanol−Zinc Borate Mixtures

Supercritical Carbon Dioxide Drying of Methanol−Zinc Borate Mixtures

Hydrothermal Synthesis, Characterization, and Tribological Behavior of Oleic Acid-Capped Lanthanum Borate with Different Morphologies

Synthesis of hydrophobic nanostructured zinc borate from zinc carbonate, and characterization of the product

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