Synthesis of magnetite nanoparticles and the process of forming Fe-based nanomaterials
    6.
    发明授权
    Synthesis of magnetite nanoparticles and the process of forming Fe-based nanomaterials 失效
    磁铁矿纳米颗粒的合成及形成铁基纳米材料的工艺

    公开(公告)号:US06962685B2

    公开(公告)日:2005-11-08

    申请号:US10124078

    申请日:2002-04-17

    申请人: Shouheng Sun

    发明人: Shouheng Sun

    摘要: A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200–360 C is described. The size of the particles can be controlled either by changing the iron salt to acid/amine ratio or by coating small nanoparticles with more iron oxide. Magnetite nanoparticles in the size ranging from 2 nm to 20 nm with a narrow size distribution are obtained with the invention. The invention can be readily extended to other iron oxide based nanoparticle materials, including M Fe2O4 (M=Co, Ni, Cu, Zn, Cr, Ti, Ba, Mg) nanomaterials, and iron oxide coated nanoparticle materials. The invention also leads to the synthesis of iron sulfide based nanoparticle materials by replacing alcohol with thiol in the reaction mixture. The magnetite nanoparticles can be oxidized to γ-Fe2O3, or α-Fe2O3, or can be reduced to bcc-Fe nanoparticles, while iron oxide based materials can be used to make binary iron based metallic nanoparticles, such as CoFe, NiFe, and FeCoSmx nanoparticles.

    摘要翻译: 描述了通过将铁盐与醇,羧酸和胺在有机溶剂中混合并将混合物加热至200-360℃来制备磁铁矿纳米颗粒材料的方法和结构。 颗粒的大小可以通过将铁盐改变成酸/胺的比例或通过用更多的氧化铁涂覆小的纳米颗粒来控制。 通过本发明获得尺寸范围为2nm至20nm且具有窄尺寸分布的磁铁矿纳米颗粒。 本发明可以容易地扩展到其它基于氧化铁的纳米颗粒材料,包括M Fe 2 O 4(M = Co,Ni,Cu,Zn,Cr,Ti,Ba ,Mg)纳米材料和氧化铁涂覆的纳米颗粒材料。 本发明还导致通过在反应混合物中用硫醇代替醇来合成基于硫化铁的纳米颗粒材料。 磁铁矿纳米粒子可被氧化成γ-Fe 2 O 3 3或α-Fe 2 O 3 3, 或可以还原成bcc-Fe纳米颗粒,而基于氧化铁的材料可用于制备二元铁基金属纳米颗粒,例如CoFe,NiFe和FeCoSmx纳米颗粒。

    Monodisperse nanoparticle containing thin films via self-assembly
    8.
    发明申请
    Monodisperse nanoparticle containing thin films via self-assembly 审中-公开
    通过自组装的含有薄膜的单分散纳米粒子

    公开(公告)号:US20050009079A1

    公开(公告)日:2005-01-13

    申请号:US10912266

    申请日:2004-08-05

    摘要: A method and structure that forms a multilayer nanoparticle thin film assembly begins by functionalizing a substrate with functional molecules. Next, the invention replaces a stabilizer on a bottom surface of the first nanoparticles with the functional molecules via surface ligand exchange to make a first nanoparticle layer on the substrate. The invention then replaces the stabilizer on a top surface of the first nanoparticle layer with functional molecules via surface ligand exchange. The invention replaces the stabilizer on a bottom surface of the second nanoparticles with the functional molecules via surface ligand exchange to make a second nanoparticle layer on the first nanoparticle layer. Lastly, the invention repeats the previous steps and forms additional nanoparticle layers.

    摘要翻译: 形成多层纳米颗粒薄膜组件的方法和结构开始于用功能分子官能化底物。 接下来,本发明通过表面配体交换将第一纳米颗粒的底表面上的稳定剂与官能分子取代,以在衬底上形成第一纳米颗粒层。 然后,本发明通过表面配体交换用功能分子替代第一纳米颗粒层的顶表面上的稳定剂。 本发明通过表面配体交换将具有功能分子的第二纳米颗粒的底表面上的稳定剂替代为在第一纳米颗粒层上形成第二纳米颗粒层。 最后,本发明重复前述步骤并形成额外的纳米颗粒层。

    Metal salt reduction to form alloy nanoparticles
    9.
    发明授权
    Metal salt reduction to form alloy nanoparticles 失效
    金属盐还原形成合金纳米粒子

    公开(公告)号:US06676729B2

    公开(公告)日:2004-01-13

    申请号:US10039540

    申请日:2002-01-02

    申请人: Shouheng Sun

    发明人: Shouheng Sun

    IPC分类号: B22F924

    摘要: A method for making nanoparticles via metal salt reduction comprises, first, mixing metal salts in a solvent. Second, a reducing agent is added to the solvent at a temperature in the range of 100° C. to 350° C. Third, the nanoparticles dispersion is stabilized. Fourth, the nanoparticles are precipitated from the nanoparticle dispersion. Finally, the nanoparticles are re-dispersed into the solvent. The metal salt comprises a combination of FeCl2, FeCl3, Fe(OOCR)2, Fe(RCOCHCOR)3, CoCl2, Co(OOCR)2, Co(RCOCHCOR)2, and one of Pt(RCOCHCOR)2, PtCl2. The reducing agent comprises one of MBR3H, MH, M naphthalides, and polyalcohol; wherein R comprises one of H and an alkyl group, wherein M comprises one of Li, Na, and K. Long chain alkyl diols, and alkyl alcohol, can be used as a co-surfactant or a co-reducing agent to facilitate nanoparticle growth and separation.

    摘要翻译: 通过金属盐还原制备纳米颗粒的方法包括首先在溶剂中混合金属盐。 其次,在100〜350℃的温度下,向溶剂中添加还原剂。第三,使纳米粒子分散体稳定。 第四,纳米颗粒从纳米颗粒分散体中沉淀。 最后,将纳米颗粒再分散到溶剂中。 金属盐包括FeCl 2,FeCl 3,Fe(OOCR)2,Fe(RCOCHCOR)3,CoCl 2,Co(OOCR)2,Co(RCOCHCOR)2和Pt(RCOCHCOR)2,PtCl 2之一的组合。 还原剂包括MBR3H,MH,M萘和多元醇之一; 其中R包括H和烷基中的一个,其中M包括Li,Na和K中的一种。长链烷基二醇和烷基醇可以用作助表面活性剂或共还原剂以促进纳米颗粒生长 和分离。