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Ana Arizaga Gemma Ibarz Rafael Piñol Ainhoa Urtizberea 《Journal of Experimental Nanoscience》2014,9(6):561-569
A multiresponsive system that consists on pH-responsive polymer microspheres with encapsulated iron oxide magnetic nanoparticles that rendered the core magnetic to enable externally controlled actuation under magnetic induction has been developed. The inorganic nanoparticles were first prepared and, then, further encapsulated in a pH-sensitive poly(4-vinylpyridine). These spheres have been obtained by a modification of the simple, rapid and high-reproducible nanoprecipitation method. Magnetic measurements showed that the iron oxide nanoparticles are superparamagnetic and, therefore, able to undergo a local increase of the temperature when an oscillating magnetic field is applied. Magnetically triggered heating and pH sensitivity can be useful for biomedical applications. 相似文献
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Maghemite nanoparticle‐decorated hollow fiber electromembrane extraction combined with dispersive liquid–liquid microextraction for determination of thymol from Carum copticum 下载免费PDF全文
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《Baosteel Technical Research》2010,(Z1):134
Magnetizing roasting via a fluidized bed,which was recognized as an efficient method for beneficiation of low-grade iron ores,has attracted much attention in China recently due to the fluctuation of the international iron ore market.In order to examine the effects of magnetic properties on the separability and to optimize the operating parameters,magnetic susceptibility and coercivity of a low-grade hematite after magnetizing reduction and reoxidation under different conditions were investigated.It was found that the magnetic susceptibility of roasted ore increased with reduction degree and particle diameter to different degrees.The magnetite was re-oxidized to maghemite when the temperature was below 400℃,and the magnetic susceptibility decreased slightly.The recovery efficiency decreased notably with the particle size for very fine grains although no significant change was found in magnetic susceptibility.The coercivity and remanence of roasted ores decreased with increasing roasting temperature.The scanning electron microscope(SEM) study showed that more cracks were produced by the reoxidation of reduced ores,which could possibly favor the intergranular fracturing and the liberation for further treatment. 相似文献
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巴西和印度粗矿粉烧结特性研究 总被引:1,自引:0,他引:1
对巴西和印度粗矿粉的烧结性能进行了研究,结果表明,这两种矿烧结性能较差,当它们的总和超过综合料配比的30%时,烧结矿产量降低,含粉率升高,大烟道温度下降。其原因是巴西矿和印度矿粒度组成差,颗粒形成不合理及软化温度区间大所致。 相似文献
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Yi‐nan Wu Meimei Zhou Shu Li Zehua Li Jie Li Baozhen Wu Guangtao Li Fengting Li Xiaohong Guan 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(14):2927-2936
A general one‐step in situ pyrolysis route for the construction of metal–organic frameworks encapsulating superparamagnetic γ‐Fe2O3 NPs dispersed in the confined cavities of MOFs homogeneously is described. The integration of γ‐Fe2O3 NPs or clusters into MOFs can endow these porous materials with superparamagnetic element. By the combination of the thermal stability of MOFs and pyrolysis of metal triacetylacetonate complex at matched conditions, the porous structure of MOFs are well maintained while the size‐induced superparamagnetic property of nano γ‐Fe2O3 is obtained. As a proof of concept, both the γ‐ Fe2O3@ZIF‐8 and γ‐Fe2O3@MIL‐53(Al) were successfully prepared, and the latter was chosen to demonstrate its potential drug delivery as a magnetic MOF. 相似文献
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The detailed microstructure of oxides at the metal–scale interface of a commercial, hot-rolled steel strip has been examined using analytical electron microscopy. A continuous magnetite layer of about 1–2 m thick was observed at the interface. The magnetite layer often contained cracks propagating in directions parallel to the interface. In the vicinity of the cracks, the magnetite was oxidized to nanosized maghemite (-Fe2O3). We also observed evidence indicating the existence of microchannels which were roughly perpendicular to the interface and might allow oxygen to reach the embedded cracks. Oxide above the magnetite layer was a mixture of -iron and magnetite produced by wustite decomposition. 相似文献
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Pavel ?tarha David Smola Ji?í Tu?ek Zdeněk Trávní?ek 《International journal of molecular sciences》2015,16(1):2034-2051
The preparation and thorough characterization of a hybrid magnetic carrier system for the possible transport of activated platinum-based anticancer drugs, as demonstrated for cisplatin (cis-[Pt(NH3)2Cl2], CDDP), are described. The final functionalized mag/Au–LA–CDDP* system consists of maghemite/gold nanoparticles (mag/Au) coated by lipoic acid (HLA; LA stands for deprotonated form of lipoic acid) and functionalized by activated cisplatin in the form of cis-[Pt(NH3)2(H2O)2]2+ (CDDP*). The relevant techniques (XPS, EDS, ICP-MS) proved the incorporation of the platinum-containing species on the surface of the studied hybrid system. HRTEM, TEM and SEM images showed the nanoparticles as spherical with an average size of 12 nm, while their superparamagnetic feature was proven by 57Fe Mössbauer spectroscopy. In the case of mag/Au, mag/Au–HLA and mag/Au–LA–CDDP*, weaker magnetic interactions among the Fe3+ centers of maghemite, as compared to maghemite nanoparticles (mag), were detected, which can be associated with the non-covalent coating of the maghemite surface by gold. The pH and time-dependent stability of the mag/Au–LA–CDDP* system in different media, represented by acetate (pH 5.0), phosphate (pH 7.0) and carbonate (pH 9.0) buffers and connected with the release of the platinum-containing species, showed the ability of CDDP* to be released from the functionalized nanosystem. 相似文献