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[求助]
鎳等磁性納米粒子一維"豆莢"型結(jié)構(gòu)的制備和磁化特征(10774138)
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鐵桿木蟲(chóng) (著名寫(xiě)手)
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【答案】應(yīng)助回帖
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nlkuhrj: 金幣+40, 基金HEPI+1, ★★★★★最佳答案 2013-02-22 22:23:32
nlkuhrj: 金幣+40, 基金HEPI+1, ★★★★★最佳答案 2013-02-22 22:23:32
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中文摘要： 本課題在一維鏈納米結(jié)構(gòu)的制備、表征和應(yīng)用方面取得了系列成果，已經(jīng)發(fā)表SCI檢索論文20篇，其中影響因子大于3的有11篇。獲得兩項(xiàng)國(guó)家發(fā)明專(zhuān)利。代表性工作包括：通過(guò)在超臨界CO2體系中分解二茂鐵成功制備了非晶碳層包裹的Fe3O4納米粒子一維鏈，這些鏈?zhǔn)怯梢欢〝?shù)量的單磁疇Fe3O4粒子沿著平行于非晶碳層的方向有序排列而成的。Fe3O4納米粒子的粒徑范圍為40-120nm,且每?jī)蓚�(gè)相鄰粒子間的間距幾乎相等。研究發(fā)現(xiàn)粒子間的強(qiáng)磁偶極子相互作用促使納米粒子自組裝形成有序的一維鏈狀結(jié)構(gòu)。磁測(cè)量和磁力顯微鏡表征揭示一維鏈在室溫下呈現(xiàn)長(zhǎng)程鐵磁有序。在基于Fe3O4納米粒子一維鏈磁響應(yīng)液態(tài)光子晶體和BRAGG反射器制備方面取得了很大進(jìn)展，通過(guò)控制間距，制備了對(duì)紅、藍(lán)等特定波長(zhǎng)有異常反射的磁響應(yīng)BRAGG反射器。在特殊一維結(jié)構(gòu)—環(huán)的大量制備和組裝規(guī)律方面取得了新的進(jìn)展，通過(guò)對(duì)形成機(jī)理的深入研究，能夠可控制備大量一維環(huán)狀磁通閉合態(tài)結(jié)構(gòu)。 中文主題詞： 一維鏈納米結(jié)構(gòu);一維環(huán)狀磁通閉合態(tài)結(jié)構(gòu);一維鏈磁響應(yīng)液態(tài)光子晶體;Fe3O4 納米粒子 英文摘要: 19 papers have been published under the financial support by the project of the National Natural Science Foundation of China under Grant No. 10774138, including 11 papers with IF higher than 3. For example, magnetite chains with a number of magnetite particles arranged in a line parallel to the outer amorphous carbon coating have been prepared. The sizes of the nanoparticles range from 40 to 120 nm, with nearly identical gaps between every two adjacent particles. The synthesized chains display ferromagnetic properties with several single-magnetic-domain (SD) nanoparticles assembled in an orderly fashion. Based on the formation process of chains in our reaction system, it is suggested that the localized environments favor the growth of SD nanoparticles, and the strong magnetic dipolar–dipolar interactions lead to the self-assembly of SD nanoparticles. Superparamagnetic colloidal nanochains (CNCs) coated and linked by carbon were prepared by solvothermal decomposition of ferrocene at a temperature of 180-200 °C with a 0.20 T magnetic-field applied. It is demonstrated that CNCs with different intraparticle spaces (216, 186, and 173 nm) can be obtained by changing the reaction temperature. Under the induction of an external magnetic field (e.g., 0.10 T), the ethanol suspension of the three samples can diffract different wavelengths of visible light, displaying red, green, and blue color, respectively. The three samples did not show the dependence of the diffraction wavelength on the strength of induction magnetic field, which indicates that the superparamagnetic CNCs can be used as magnetic-responsive Bragg reflectors. 英文主題詞： 1D nanostructures; 1D nanorings; magnetic-responsive liquid Bragg reflectors of 1D chains; magnetite nanoparticles |
2樓2013-02-22 21:02:03
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