顺磁性

FeSi nanoparticles were synthesized via thermal decomposition of iron pentacarbonyl in the solution of dioctyl ether, stabilizers oleic acid and oleylamine. The TEM images showed that FeSi nanoparticles had cubic shape, but it seemed that the composition was not uniform. According to the EDS results, the Fe:Si ratio of gray-uniform nanopaiticles was almost 1:1, and blacker FeSi nanoparticles contained more Fe atoms. Although FeSi didn't have uniform structure, it still could be proved that the incorporation of Fe and Si existed in a single nanoparticle. All possible structure, lattice, binding, morphology, surface condition would be discussed. These results indicated that perhaps FeSi2 was the main structure of the new products; however, due to incompletely combination and less synthesized time, it might still contain some part of Si and Fe structure. Besides, FeSi nanoparticles preserved the optical properties from Si atoms, but the PL intensity was much lower. The maxima PL peak appeared at 388 nm with the excitation at 300 nm. Their saturation magnetization, remanent magnetization and coercivity were measured by the SQUID, exhibiting their nearly superparamagnetic behavior.

利用热裂解系统可成功将研磨矽奈米粒子及五羰铁结合，制备出铁矽奈米粒子；从穿透式显微镜照片可知其粒子呈现立方体型态，但颜色深浅及组成不均，EDS结果则显示颜色均匀之粒子铁与矽之组成大致为1：1，颜色较深之粒子则含有较高量的铁元素；尽管组成比例并不统一，但单颗粒子同时含有矽与铁两种元素，初步说明铁矽奈米粒子之形成；进行多种结构与表面分析并探讨所有可能之键结、结构及表面元素后，推测铁矽奈米粒子可能以FeSi2之结构形成，并同时包含未重组完成的矽及铁之结构；利用PL分析得知铁矽奈米粒子确实保留矽之放光特性，并在300 nm激发光源下，於波长388 nm处有一最强放光特性峰，但整体发光效益不及研磨矽奈米粒子之结果；最后，利用超导量子干涉磁化仪量测其饱和磁化量、残留磁化量、与矫顽磁力，发现磁滞现象并不明显而几乎呈超顺磁性。

Monodisperse carboxylated superparamagnetic polymer composite microspheres with high magnetite content were prepared by miniemulsion copolymerzation,in which acrylic acid and styrene were used as polymeric monomers,and Fe3O4 microparticles were costabilized by undecylenic acid /oleic acid.

在表面由十一烯酸和油酸共同修饰的Fe3O4磁流体存在下，以苯乙烯和丙烯酸为共聚单体，用细乳液聚合法，制备了单分散，高Fe3O4含量，且表面带有羧基的超顺磁性高分子复合微球。

When the vials are full of Ar with previous vacuumize, the final milling product is disorder nanocrystalline Fe-Cr solid solution with ferromagnetism similar to the bulk alloys.

球磨50h，形成了bcc结构的顺磁性纳米晶Cr-Fe-V合金。在富Cr的合金成份内，Fe含量越高，生成均质的纳米晶Fe-Cr-V合金所需的球磨时间越长。

Liver ; stem cells ; transplantation ; superparamagnetic iron oxid ; magnetic resonance imaging

肝； 干细胞；移植；超顺磁性氧化铁；磁共振成像

AIM: To label bone marrowderived stem cells with superparamagnetic iron oxid and to explore the image characteristics and signal attenuation rules of in vivo the magnetic resonance imaging of the labeled cells in rabbit liver.

目的：探讨超顺磁性氧化铁标记骨髓干细胞的方法和标记细胞在肝脏内的磁共振活体成像特点和衰减规律。

Once delivered to the heart, injected cells are difficult to distinguish from target tissue by MR in vivo.To specifically imaging injected cells in MR, the recent investigation generally using superparamagnetic iron oxid to label MSCs, which should enable serial tracking and quantification of MSC transplantation noninvasively by MR.

由于MR成像无法区分移植细胞和靶组织细胞，为使移植细胞能在MR上特异性显示，目前广泛使用超顺磁性氧化铁(superparamagnetic iron oxid， SPIO)作为负性标记物标记移植细胞，进行MR体外和活体内的成像研究。

It was found that the stability of the nickelchelates is in accord with the base strength of the amino acids,and these chelates shou...

实验结果表明镍的络合物具四面体结构，N-萘氨基乙酸镍的顺磁性亦证明此点。

In order to expand the application of MRI contrast agent in clinical studies, in this paper the lyophilized SPIO was prepared.

为进一步拓展MRI造影剂在国内的临床应用，本文制备了注射用超顺磁性铁氧体纳米微粒。

Fluid pattern is suitable for NMR porosity calibration in Berea sandstone as well as terrestrial sediment sand with little shale content and well sorted. Ceramics reference material is applied to shaly sand with average sorted. Both fluid pattern and solid ceramics material are not suitable for calibration in sandstone sample with high clay content, complex lithology with rich paramagnetic materials.

流体标样适合于贝瑞砂岩、陆相沉积分选好、泥质含量低的砂岩NMR孔隙度的标定；固体陶瓷标样适合于分选中等的泥质砂岩NMR孔隙度的标定；对粘土含量高的砂岩、含顺磁性物质的砂岩和砾岩等复杂岩性岩样，用流体标样和固体陶瓷标样标定都得不到准确的NMR孔隙度值。

The results show that the nano-structured materials were exactly β-manganese dioxides with tetragonal crystal structures and consisted of straight and smooth nanorods with diameters in the range of 50~70 nm and lengths up to several micrometers, and the β-MnO2 displays also superparamagnetism characteristics.

结果表明，纳米粉体产物是直径为50~70nm，长度约为几个微米并具有四方晶体结构的β-MnO2纳米棒，同时产物表现出超顺磁性特征。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。