将纳米Fe3O4磁性颗粒加入由PMDA和ODA制备的PAA聚合物溶液中,通过静电纺丝法制备PAA/Fe3O4复合纤维。利用扫描电镜(SEM)和透射电镜(TEM)对复合纳米纤维的微观形貌和Fe3O4在纤维中的分布进行了观察,采用X射线衍射仪(XRD)验证了Fe3O4在复合纳米纤维中的存在,通过磁性实验分析了纳米复合材料的磁性能,同时使用红外光谱仪对纳米复合材料的化学结构进行了分析。结果表明,所制备PAA/Fe3O4磁性纳米纤维成型良好,Fe3O4磁性颗粒已分散在纤维中,与PAA是物理复合,材料具有一定磁性,为进一步制备聚酰亚胺磁性复合纳米纤维做了有益的探索研究。聚合物磁性复合材料由于其独特的物理化学性能及超顺磁性,有着广阔的应用前景。

The PMDA and ODA were used to prepare polyamic acid(PAA)solution and Fe3 O4 magnetic nanop-articles were added to the PAA solution containing the dispersant.The nanofibers of PAA/Fe3 O4 were prepared by electro-spinning.The microstructure of nanocomposite fibers and the distribution of magnetite (Fe3 O4 )nan-oparticles in fibers were characterized using scanning electron microscopy (SEM)and transmission electron mi-croscopy(TEM).And X-ray diffractometry(XRD)proved that Fe3 O4 nanoparticles existed in nanocomposite fi-bers.The magnetic properties of Fe3 O4 nanoparticles and nanocomposites were characterized using SQUID. Fourier transform infrared spectroscope (FT-IR)was used to analysis the chemical structures.The study showed that the morphology of the PAA/Fe3 O4 nanocomposite fibers was uniform and continuous,and Fe3 O4 nanoparticles were dispersed in the PAA solution by physical composite.The nanocomposite fibers showed a certain magnetic property.In this paper,some beneficial invest

以磁性纤维、黏胶纤维混纺纱为原料，编织开发出纬平针、1＋1罗纹、畦编、半畦编、罗纹空气层、罗纹半空气层共6种组织的针织面料，分别测试它们的顶破强力、透气性、透湿性、保温性、折皱弹性、刚柔性以及磁感应功能等性能．并采用模糊数学综合评判的方法对磁性纤维针织面料的服用性能进行综合分析与评价。结果表明：罗纹空气层组织综合服用性能最好。畦编组织次之，纬平针组织和1＋1罗纹组织相近．罗纹半空气层组织最差：该磁性纤维针织面料舒适性和外观保形性均满足服用要求，面料表面磁感应强度可以达到磁疗效果的要求．适合开发保健功能性服装。

The paper develops six kinds of knitted fabrics by using magnetic fiber yarns-plain, 1+1 rib, full-cardigan stitch, royal rib, piquette and cross miss stitch, and also tests their bursting strength, air permeability, moisture permeability, heat retention, crease elasticity, flexibility and magnetic inductive properties. In addition, it makes a comprehensive evaluation for the testing results by using a fuzzy mathematical method. It points out that the piquette bears the most excellent wearing properties, full-cardigan stitch comes second; those for plain and 1+1 rib are similar; and the cross miss stitch shows the worst in all. Finally, it indicates that the comfort properties and the shape-preserving properties can meet the wearing request, the magnetic inductive intensity can reach the medical magnetic effects for healthy, which is suitable for developing the health care functional garments.

以聚乙烯吡咯烷酮、钛酸丁酯和Fe3O4@SiO2为前驱物，将静电纺丝技术和高温煅烧法相结合，成功地制备出内含Fe3O4@SiO2纳米粒子的磁性TiO2纳米纤维。利用XRD、SEM、TEM、UV-Vis光谱及Shole7304型振动样品磁强计等测试手段对样品的结构和形貌及磁性进行表征，在光催化实验中选罗丹明B为降解模拟污染物测试了太阳光照射下的光催化活性。实验结果表明：所制备的磁性TiO2纳米纤维在模拟太阳光光照下表现出较好的光催化活性。另外，该纤维在外加磁场下能够简单有效地分离回收。

The magnetic TiO2 nanofibers with well-dispersed Fe3O4@TiO2 nanoparticles have been prepared by elec-trospinning technique in which PVP, Ti(OiPr)4 and different quantities Fe3O4@SiO2 were used as precusors. XRD, SEM, TEM, Uv-vis spectrums were used to characterize and analyze the structure and morphology and sample magnetic properties were tested by shole 7304 magnetometer. The photocatalytic activity was determined under ultraviolet light irradiation by using RhB degration as model reaction. The results show that the as-prepared samples were anatases and Fe3O4@SiO2 were distributed in the TiO2 nanofibers averagely. The Uv-vis spectrum indicate that TiO2 photocatalytic activity apparently enhanced and the adsorption range was shifted to the infrared region. The as-prepared samples with strong magnetism can be separated and rewarded by adding the magnetic field. The photocatalytic activity of RhB degradation for the samples under ultraviolet light irradiation was improved sign

系统研究了含钴聚碳硅烷交联丝的氧含量对所成含钴碳化硅(Co-SiC)纤维结构与性能的影响。研究结果显示,较之交联丝Co-PCS-air, Co-PCS-O2的氧含量较高,陶瓷产率较高,所成纤维的SiCxOy相含量较高、β-SiC和CoSi晶粒的增长速度较快,晶粒的尺寸较大,达到最大力学性能的烧结温度较低,电阻率也较低。该纤维电阻率在100~103Ω?cm之间可调,且具有一定的磁性,有望用作吸波纤维。

In this work,it was systematically studied that how oxygen content of cured cobalt-containing polycar-bosilance (PCS)fibers influences the structure and properties of cobalt-containing silicon carbide(Co-SiC)fi-bers.Compared to cured Co-PCS-air fibers,Co-PCS-O2 fibers have a higher oxygen content and higher ceramic yield.For Co-PCS-O2 fibers derived from cured Co-PCS-O2 ,lower pyrolysis temperature was required to reach maximum mechanical properties.And higher SiCx Oy content,higher growing speed and final sizes ofβ-SiC and CoSi grains and lower electrical conductivity were observed.Co-PCS-O2 fibers have a electrical conductivity con-trollable between 100- 103Ω??cm and were magnetic to some degree,enabling this kind of fibers to have the po-tential to be used as wave-absorbing materials.

电纺纳米纤维因具有快速的吸/脱附特性和较高的吸/脱附效率等独特优势,近年来被广泛用于食品分析检测。本文简述了纳米纤维特性及静电纺丝技术,重点综述了电纺纳米纤维在食品分析检测中的应用,其中着重对聚苯乙烯(PS)、尼龙6等单组份电纺纳米纤维以及聚冠醚/聚苯乙烯(PCE-PS)等混合组份纳米纤维在食品分析中的应用进展做了阐述,同时对其他一些纳米材料如纳米晶簇、碳纳米管、石墨烯、磁性纳米粒子、纳米金属氧化物、量子点在食品分析检测中的某些最新研究成果和应用做了简要介绍;此外还展示了一些纳米纤维固相萃取器件和装置,并对其做了简要说明;最后对电纺纳米纤维在食品分析检测中的应用作了总结和展望。

Electrospinning nanofibers have been used for food analysis and determination in recent years because of their unique advantages, such as high efficiency and fast speed of absorption/desorption. In this paper, nanofiber properties and electrospinning technology are sketched. The application of elec-trospinning nanofibers on food analysis has been elaborately summarized, especially one-component elec-trospinning nanofibers, mainly including polystyrene (PS) and nylon 6, and hybrid components electros-pinning nanofibers, mainly including polymeric crown ethers/polystyrene (PCE-PS). Some new study re-sults of other nanomaterials, mainly including nanocrystalline clusters, carbon nanotubes, grapheme, magnetic nanoparticles, nanoscale metal oxides, quantum dot, on food analysis are briefly introduced. Additionally, the novel packed-fiber solid-phase extraction devices and apparatus have been also presented and briefly described. At last, the application of the electrospinning nanofibers on