Soft magnetic composites （SMCs） were prepared from three different ferromagnetic powder particles： iron powder ASC 100.29, spherical FeSi particles and vitroperm （Fe73CulNb3Si16B7） flakes. Two types of hybrid org...Soft magnetic composites （SMCs） were prepared from three different ferromagnetic powder particles： iron powder ASC 100.29, spherical FeSi particles and vitroperm （Fe73CulNb3Si16B7） flakes. Two types of hybrid organic-inorganic phenolic resins modified with either silica nanoparticles or boron were used to design a thin insulating layer perfect- ly covering the ferromagnetic particles. Fourier transform infrared （FTIR） spectrometry confirmed an incorporation of silica or boron into the polymer matrix, which manifested itself through an improved thermal stability of the hybrid resins verified by thermogravimetric-differential scanning calorimetry （TG-DSC） analysis. The core-shell particles prepared from the ferromagnetic powder particles and the modified hybrid resins were further compacted to the cylindrical and toroidal shapes for the mechanical, electrical and magnetic testing. A uniform distribution of the resin between the ferromagnetic particles was evidenced by scanning electron microscope （SEM） analysis, which was also reflected in a rather high value of the electrical resistivity. A low porosity and extraordinary high values of mechanical hardness and flexural strength were found in SMC consisting of the iron powder and phenolic resin modified with boron. The coercive fields of the prepared samples were comparable with the commercial SMCs.展开更多
Objective：To evaluate the in vitro and in vivo toxicity of self-prepared nanosized Fe2O3, which has the potential implication in tumor hyperthermia. Methods： Fe2O3 nanoparticles were prepared by improving co-precipi...Objective：To evaluate the in vitro and in vivo toxicity of self-prepared nanosized Fe2O3, which has the potential implication in tumor hyperthermia. Methods： Fe2O3 nanoparticles were prepared by improving co-precipitation, which characterization was detected by TEM, XRD, CMIAS, EDS. MTT assay was used to evaluate the in vitro cytotoxicity test; hemolytic test was carried out to estimate whether it has blood toxicity; Fe2O3 suspended in sterile 0.9% NaCl was intraperitoneally injected into Kumning mouse to calculate the LD50 ; micronucleus （MN） were reckoned to identify whether it is genotoxic. Results：The nanoparticles are brown spherical particles with diameter ranging from 8 to 15 nm, which have good decentralization and stability. The experiments also showed that the toxicity of the material on mouse fibroblast （L-929） cell lines was 0 - 1 degree ; it has no hemolysis activity; LD50 arrived at 5.45 g/kg^-1 after intraperitoneal injection of 1 ml suspension; micronucleus test showed that it has no genotoxic effects either. Conclusion： The results showed that the Fe2O3 nanoparticles are prepared successfully, the self-prepared nanosized Fe2O3 is a kind of high biocompatibility materials and perhaps it is suitable for further application in tumor hyperthermia.展开更多
目的:研究超顺磁性纳米铁颗粒(superparamagnetic iron oxide particles,SPIO)体外标记人脐带间充质干细胞(HUCMSCs)及MRI成像示踪的可行性。方法:从人胎儿脐带中分离培养、扩增脐带间充质干细胞(HUCMSCs),分别采用0μg/ml,25μg/ml,50...目的:研究超顺磁性纳米铁颗粒(superparamagnetic iron oxide particles,SPIO)体外标记人脐带间充质干细胞(HUCMSCs)及MRI成像示踪的可行性。方法:从人胎儿脐带中分离培养、扩增脐带间充质干细胞(HUCMSCs),分别采用0μg/ml,25μg/ml,50μg/ml浓度的SPIO标记0.5x106,1x106,2x106和10x106HUCMSCs。普鲁士蓝染色和透射电镜鉴定细胞内铁颗粒情况,并用3.0TMRI离体扫描T1WI,T2WI,GRE/300序列成像,测定细胞群信号。结果:不同数量的HUCMSCs与0μg/ml,25μg/ml,50μg/ml浓度的SPIO共同培养18小时,普鲁士蓝染色发现标记的细胞随标记浓度的升高染色程度逐渐加深。透射电镜检查显示细胞内含致密铁颗粒。离体MRI不同序列测定不同浓度SPIO标记相同数量的细胞群,GRE/30°和T2WI测定的各组之间均有统计学差别,50μg/ml与25μg/ml组分别与0μg/ml组之间有显著统计学差别(P<0.05);同一浓度SPIO标记人脐带间充质干细胞,信号强度与细胞数量有关(P<0.05)。结论:SPIO可以标记人脐带间充质干细胞,应用MRI可以对其进行体外示踪和监测。展开更多
基金Supported by the Slovak Research and Development Agency under the contracts(APVV-0222-10)the Operational Program"Research and Development"financed through European Regional Development Fund(ITMS 26220220105)the Scientific Grant Agency of the Ministry of Education of Slovak Republic and the Slovak Academy of Sciences,projects(VEGA 1/0861/12,VEGA 1/0862/12,VEGA VEGA 2/0155/12)
文摘Soft magnetic composites （SMCs） were prepared from three different ferromagnetic powder particles： iron powder ASC 100.29, spherical FeSi particles and vitroperm （Fe73CulNb3Si16B7） flakes. Two types of hybrid organic-inorganic phenolic resins modified with either silica nanoparticles or boron were used to design a thin insulating layer perfect- ly covering the ferromagnetic particles. Fourier transform infrared （FTIR） spectrometry confirmed an incorporation of silica or boron into the polymer matrix, which manifested itself through an improved thermal stability of the hybrid resins verified by thermogravimetric-differential scanning calorimetry （TG-DSC） analysis. The core-shell particles prepared from the ferromagnetic powder particles and the modified hybrid resins were further compacted to the cylindrical and toroidal shapes for the mechanical, electrical and magnetic testing. A uniform distribution of the resin between the ferromagnetic particles was evidenced by scanning electron microscope （SEM） analysis, which was also reflected in a rather high value of the electrical resistivity. A low porosity and extraordinary high values of mechanical hardness and flexural strength were found in SMC consisting of the iron powder and phenolic resin modified with boron. The coercive fields of the prepared samples were comparable with the commercial SMCs.
基金Grant sponsor:National Natural Science Foundation of China,Grant number:30371830Grant sponsor:National Hi-tech research and development program of China,Grant number:2002AA302207+3 种基金 Grant sponsor:Natural Science Foundation of Jiangsu,Grant number:BK2001003Grant sponsor:Hi-tech research pro-gram of Jiangsu,Grant number:BG2001006 Grant sponsor:Key Project of Chinese Traditional Medicine of Jiangsu,Grant number:H027Grant sponsor:Sci-ence Foundation of Southeast University,Grant number:9223001162
文摘Objective：To evaluate the in vitro and in vivo toxicity of self-prepared nanosized Fe2O3, which has the potential implication in tumor hyperthermia. Methods： Fe2O3 nanoparticles were prepared by improving co-precipitation, which characterization was detected by TEM, XRD, CMIAS, EDS. MTT assay was used to evaluate the in vitro cytotoxicity test; hemolytic test was carried out to estimate whether it has blood toxicity; Fe2O3 suspended in sterile 0.9% NaCl was intraperitoneally injected into Kumning mouse to calculate the LD50 ; micronucleus （MN） were reckoned to identify whether it is genotoxic. Results：The nanoparticles are brown spherical particles with diameter ranging from 8 to 15 nm, which have good decentralization and stability. The experiments also showed that the toxicity of the material on mouse fibroblast （L-929） cell lines was 0 - 1 degree ; it has no hemolysis activity; LD50 arrived at 5.45 g/kg^-1 after intraperitoneal injection of 1 ml suspension; micronucleus test showed that it has no genotoxic effects either. Conclusion： The results showed that the Fe2O3 nanoparticles are prepared successfully, the self-prepared nanosized Fe2O3 is a kind of high biocompatibility materials and perhaps it is suitable for further application in tumor hyperthermia.
文摘目的:研究超顺磁性纳米铁颗粒(superparamagnetic iron oxide particles,SPIO)体外标记人脐带间充质干细胞(HUCMSCs)及MRI成像示踪的可行性。方法:从人胎儿脐带中分离培养、扩增脐带间充质干细胞(HUCMSCs),分别采用0μg/ml,25μg/ml,50μg/ml浓度的SPIO标记0.5x106,1x106,2x106和10x106HUCMSCs。普鲁士蓝染色和透射电镜鉴定细胞内铁颗粒情况,并用3.0TMRI离体扫描T1WI,T2WI,GRE/300序列成像,测定细胞群信号。结果:不同数量的HUCMSCs与0μg/ml,25μg/ml,50μg/ml浓度的SPIO共同培养18小时,普鲁士蓝染色发现标记的细胞随标记浓度的升高染色程度逐渐加深。透射电镜检查显示细胞内含致密铁颗粒。离体MRI不同序列测定不同浓度SPIO标记相同数量的细胞群,GRE/30°和T2WI测定的各组之间均有统计学差别,50μg/ml与25μg/ml组分别与0μg/ml组之间有显著统计学差别(P<0.05);同一浓度SPIO标记人脐带间充质干细胞,信号强度与细胞数量有关(P<0.05)。结论:SPIO可以标记人脐带间充质干细胞,应用MRI可以对其进行体外示踪和监测。
