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Poly(ethylene terephthalate) (PET) has been mixed with fluorite (CaF2) particles to obtain micro- and nano-composites aiming to obtain a hybrid multifilament. In first term, the use of two montanic waxes and an amide wax as dispersing agents towards the compatibilization of the inorganic and organic components of the CaF2/PET composite were considered. To do this, non-isothermal crystallization studies by differential scanning calorimetry have been carried out. Moreover, the influence of the CaF2 particle size and concentration on the thermal properties of the system have been also studied by this technique. Finally, the extrapolation of the results has materialised as a novel PET/CaF2 hybrid multifilament. Thermal and mechanical properties and molecular weight of the multifilament have been as well evaluated. 相似文献
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The generalized theory of double-mode electrostatic dispersing prism for time-domain compressing electron pulse is presented. The fundamental difference between the two modes of o mode and e mode lies in the dispersive dependence of electron's time of flight on its initial kinetic energy at prism entrance: the electrons with higher initial axial energy definitely have longer time of flight for o mode, while not the case for e mode, which results from the electron pulse's U-shaped motion in the prism. The dispersive dependence of time of flight constitutes the mechanism of electron pulse compression for each mode. An example is given to demonstrate the issue of parameter choosing for the prism and to verify its tunable performance of compression. 相似文献
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Following recent work of Chernov, Markarian, and Zhang, it is known that the billiard map for dispersing billiards with zero
angle cusps has slow decay of correlations with rate 1/n. Since the collisions inside a cusp occur in quick succession, it is reasonable to expect a much faster decay rate in continuous
time. In this paper we prove that the flow is rapid mixing: correlations decay faster than any polynomial rate. A consequence is that the flow admits strong statistical properties
such as the almost sure invariance principle, even though the billiard map does not.
The techniques in this paper yield new results for other standard examples in planar billiards, including Bunimovich flowers
and stadia. 相似文献
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以醋酸盐为原料, 以十六烷基三甲基溴化铵(CTAB)为分散剂, 通过水热合成-高温烧结的方法制备高镍三元正极材料LiNi0.6Co0.2Mn0.2O2. 结果表明, 适量分散剂CTAB的加入可有效调节材料的颗粒形貌尺寸, 降低锂镍混排, 改善材料的电化学性能. 加入2%(质量分数) CTAB时, 制备的电池材料具有完整有序的层状结构, 且颗粒均匀分散, 具有最佳的循环性能和高低温性能. 该材料在室温及倍率1C下循环100次后, 容量保持率为88.5%. 在?20, 25和55 ℃条件下及倍率0.1C充放电时, 首次放电比容量分别为60.3, 168.5和207.2 mA·h/g. 相似文献
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A. Reindl A. Voronov P.K. Gorle M. Rauscher A. Roosen W. Peukert 《Colloids and surfaces. A, Physicochemical and engineering aspects》2008,320(1-3):183-188
One possible approach to prevent the oxidation of silicon nanoparticles during a dispersing process is to use a dispersing medium, which does not contain any oxygen atoms in its structure, e.g. toluene. However, dispersing nanoparticles in such a non-polar organic medium is a major challenge, because the particles tend to aggregate very easily. The attempt of wet-grinding non-stabilized SiNP in toluene with a stirred media mill results in μm-sized aggregates that precipitate rapidly. In order to achieve stable suspensions with regard to aggregation a suitable additive, added during the process of dispersion, is necessary. The stabilizing efficiency of several different additives, mostly oligo- and polymeric compounds, was evaluated by investigating the aggregate formation via dynamic light scattering, complemented by scanning electron micrographs. This work demonstrates that the stability of the particulate system and therefore the formation of aggregates can be adjusted selectively by the choice of the additive towards well-dispersed or densified particles. The attachment of the additives upon the surface of the SiNP was examined by diffuse reflectance infrared Fourier transform spectroscopy and the surface coverage was quantified by a combination of thermogravimetric analysis and gas sorption experiments. 相似文献
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