Preparation, characterization, and tribological evaluation of a calcium borate embedded in an oleic acid matrix / Sheng Han in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13869-13874 Titre : Preparation, characterization, and tribological evaluation of a calcium borate embedded in an oleic acid matrix Type de document : texte imprimé Auteurs : Sheng Han, Auteur ; Sizhou Liu, Auteur ; Yuhong Wang, Auteur Année de publication : 2013 Article en page(s) : pp. 13869-13874 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Calcium borate Résumé : Calcium borate nanoparticles embedded in an oleic acid liquid matrix (CBNL) with high stability in base oil were synthesized as nanoparticle lubricant additives designed as potential solution to problems of insolubility and stable dispersity using the conventional preparation method. The microstructures of the as-synthesized samples were characterized by laser particle analysis, infrared spectra, and thermogravimetric analysis. The results indicated that, in CBNL, the composition of the nanosized calcium borate was 2CaO·B2O3·xH2O, and the average size of the calcium borate nanoparticles was about 18 nm. The tribological properties of CBNL as a lubricating oil additive were evaluated on a four-ball tribometer. CBNL exhibited excellent tribological capacities including load-carrying, friction-reducing, and antiwear properties. The worn surface of the steel ball was investigated by a three-dimensional noncontact surface profile meter and X-ray photoelectron spectroscopy. The tribological mechanism of the nanoparticles was discussed. The excellent tribological properties exhibited by the as-synthesized sample resulted from a wear-resistant film containing both depositions and the tribochemical reaction products that comprise B2O3, FeB, and Fe2O3. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300940r [article] Preparation, characterization, and tribological evaluation of a calcium borate embedded in an oleic acid matrix [texte imprimé] / Sheng Han, Auteur ; Sizhou Liu, Auteur ; Yuhong Wang, Auteur . - 2013 . - pp. 13869-13874. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 13869-13874 Mots-clés : Calcium borate Résumé : Calcium borate nanoparticles embedded in an oleic acid liquid matrix (CBNL) with high stability in base oil were synthesized as nanoparticle lubricant additives designed as potential solution to problems of insolubility and stable dispersity using the conventional preparation method. The microstructures of the as-synthesized samples were characterized by laser particle analysis, infrared spectra, and thermogravimetric analysis. The results indicated that, in CBNL, the composition of the nanosized calcium borate was 2CaO·B2O3·xH2O, and the average size of the calcium borate nanoparticles was about 18 nm. The tribological properties of CBNL as a lubricating oil additive were evaluated on a four-ball tribometer. CBNL exhibited excellent tribological capacities including load-carrying, friction-reducing, and antiwear properties. The worn surface of the steel ball was investigated by a three-dimensional noncontact surface profile meter and X-ray photoelectron spectroscopy. The tribological mechanism of the nanoparticles was discussed. The excellent tribological properties exhibited by the as-synthesized sample resulted from a wear-resistant film containing both depositions and the tribochemical reaction products that comprise B2O3, FeB, and Fe2O3. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300940r

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Synthesis of dipentyl carbonate by transesterification using basic ionic liquid [bmIm] OH catalyst / Sheng Han in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5433–5437 Titre : Synthesis of dipentyl carbonate by transesterification using basic ionic liquid [bmIm] OH catalyst Type de document : texte imprimé Auteurs : Sheng Han, Auteur ; Ming Luo, Auteur ; Xiaoli Zhou, Auteur Année de publication : 2012 Article en page(s) : pp. 5433–5437 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : catalytic Ionic liquid Résumé : The catalytic synthesis from transesterification of dimethyl carbonate (DMC) and 1-pentanol (1-PeOH) over alkaline ionic liquid 1-butyl-3-methylimidazolium hydroxide ([bmIm]OH), as well as the optimal reaction conditions, was studied. Results showed that [bmIm]OH exhibited high activity and when the reaction time was 4 h, catalyst dosage was 2.0%, n(DMC):n(1-PeOH) was 1:4, and the dipentyl carbonate (DPC) yield was up to 75.81%. After the alkaline ionic liquid [bmIm]OH was used 5 times repeatedly, the catalytic activity still remained at 94%. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202628m [article] Synthesis of dipentyl carbonate by transesterification using basic ionic liquid [bmIm] OH catalyst [texte imprimé] / Sheng Han, Auteur ; Ming Luo, Auteur ; Xiaoli Zhou, Auteur . - 2012 . - pp. 5433–5437. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5433–5437 Mots-clés : catalytic Ionic liquid Résumé : The catalytic synthesis from transesterification of dimethyl carbonate (DMC) and 1-pentanol (1-PeOH) over alkaline ionic liquid 1-butyl-3-methylimidazolium hydroxide ([bmIm]OH), as well as the optimal reaction conditions, was studied. Results showed that [bmIm]OH exhibited high activity and when the reaction time was 4 h, catalyst dosage was 2.0%, n(DMC):n(1-PeOH) was 1:4, and the dipentyl carbonate (DPC) yield was up to 75.81%. After the alkaline ionic liquid [bmIm]OH was used 5 times repeatedly, the catalytic activity still remained at 94%. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202628m

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