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CePO4纳米微粒的摩擦学行为 总被引:7,自引:0,他引:7
稀土元素由于具有4f电子特性,使其元素及其化合物具有许多特殊的性能.因此,研究和开发稀土在润滑材料领域的应用,具有重要意义[1~6].本文采用吸附共沉淀表面修饰法制备了磷酸烷酯修饰的CePO4纳米微粒,并将其分散于基础润滑油中考察其摩擦学行为,试图利... 相似文献
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二(三)苄基锡不饱和烃基膦酸酯的合成 总被引:15,自引:3,他引:15
合成了10种二(三)苄基锡不饱和烃基膦酸酯[(PhCH2)nSn]n-1O2P(O)R(n=2,3;R=—C≡CPh,—C≡CC5H11-n,—C≡CCH2OCH3,—C≡CCH2OC2H5,—CH=CClPh),利用元素分析、核磁共振氢谱和TG-DTA对其组成和结构进行了表征.初步生物活性测试表明,有些化合物具有较强的杀螨和杀菌活性 相似文献
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Four BrØsted acid ionic liquids (ILS) [MMP][DMP], [MEP][DEP], [HMP][DMP] and [HEP][DEP] were synthesized and used as extractants for desulfurization of aromatic sulfur compounds in model oil. The mutual solubility of four ILs were investigated. The extraction equilibrium of four ILs could be reached in as soon as 5 min and the extraction capability followed the order [MMP][DMP]>[MEP][DEP]>[HEP][DEP]>[HMP][DMP]. The S extraction showed the highest efficiency under the conditions of 30°C, 30 min and 1:1 (V/V) IL:oil. Under the optimal condition, 70.9% of thiophene (TS), 76.9% of benzothiophene (BT) and 87.5% of dibenzothiophene (DBT) in n‐octane could be efficiently removed by [MMP][DMP]. The multiple extraction and regeneration performance of [MMP][DMP] for TS was also investigated and the results were satisfying. These results suggest that [MMP][DMP] has the best extraction capability and can serve as a promising solvent for extractive desulfurization of fuel oils. 相似文献
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The micellization of several monoalkylphoshpates with chain lenghts from 6 to 10 carbons have been investigated by31P and13C NMR spectroscopy with some additional electrical conductivity, density and small angle neutron scattering measurements.The major part of this study was performed on sodium monooctylphosphate. The critical concentration of micellization is 0.14 M, the partial molar volume is 170 cm3/mole in the micellar state. Small angle neutron scattering measurements on a 0.5 molar solution lead to an aggregation number of 43. NMR studies over the whole concentration range show that the pseudophase model holds. The geometry around the polar head is found almost unchanged upon micellization. The frequency denpendence of the31P longitudinal relaxation is interpreted by an isotropic fas motion (
R=6.5 × 10–11 for the free monomers and by a strongly anisotropic motion withD
/D
10 and
0=(6D)–1 =1.25×10–9
s in the micellar state. 相似文献
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