Controlled synthesis of core-shell iron-silica nanoparticles and their magneto-dielectric properties in polymer composites

被引:68
作者
Yang, T. I. [1 ]
Brown, R. N. C. [2 ]
CKempel, L. [3 ]
Kofinas, P. [1 ]
机构
[1] Univ Maryland, Fischell Dept Bioengn, College Pk, MD 20742 USA
[2] Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA
[3] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA
关键词
MONODISPERSE FE NANOPARTICLES; COATED COBALT NANOPARTICLES; SOL-GEL; PARTICLES; NANOCOMPOSITES; SIZE; ACID;
D O I
10.1088/0957-4484/22/10/105601
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Low loss core-shell iron-silica nanocomposites with improved magneto-dielectric properties at radio frequencies (1 MHz-1 GHz) were successfully fabricated. A new simple method was developed to synthesize metallic iron (Fe) nanoparticles with uniform size distribution in an aqueous environment at room temperature. Citric acid and oleic acid served as surface-capping agents to control the particle size of the synthesized Fe nanoparticles. Smaller Fe nanoparticles with narrower particle size distribution were obtained as the concentration ratio of iron ions to carboxylic acid groups decreased. The Fe nanoparticles were subsequently coated with silica (SiO(2)) layers to prevent the iron cores oxidizing. Polymer composites were prepared by incorporating Fe@SiO(2) nanoparticles with polydimethylsiloxane (PDMS) elastomers. Experimental results showed that the dielectric permittivity (epsilon) and magnetic permeability (mu) of the polymer composite increased with increasing amount of Fe@SiO(2) nanoparticle doping. The dielectric loss (tan delta) was near 0.020 at a frequency of 1 GHz.
引用
收藏
页数:8
相关论文
共 31 条
  • [1] CULLITY BD, 2009, INTRO MAGNETIC MAT, P418
  • [2] Superlattices of iron nanocubes synthesized from Fe[N(SiMe3)2]2
    Dumestre, F
    Chaudret, B
    Amiens, C
    Renaud, P
    Fejes, P
    [J]. SCIENCE, 2004, 303 (5659) : 821 - 823
  • [3] THE ROCK MAGNETISM OF FINE PARTICLES
    DUNLOP, DJ
    [J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1981, 26 (1-2) : 1 - 26
  • [4] STRUCTURAL CONSIDERATIONS ABOUT SIO2 GLASSES PREPARED BY SOL-GEL
    DURAN, A
    SERNA, C
    FORNES, V
    NAVARRO, JMF
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1986, 82 (1-3) : 69 - 77
  • [5] COAGULATION OF COLLOIDAL GOLD
    ENUSTUN, BV
    TURKEVICH, J
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1963, 85 (21) : 3317 - +
  • [6] Preparation and characterization of monodisperse Fe nanoparticles
    Farrell, D
    Majetich, SA
    Wilcoxon, JP
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (40) : 11022 - 11030
  • [7] Pt-Catalyzed Growth of Ni Nanoparticles in Aqueous CTAB Solution
    Grzelczak, Marek
    Perez-Juste, Jorge
    Rodriguez-Gonzalez, Benito
    Spasova, Marina
    Barsukov, Igor
    Farle, Michael
    Liz-Marzan, Luis M.
    [J]. CHEMISTRY OF MATERIALS, 2008, 20 (16) : 5399 - 5405
  • [8] Formation of colloidal silver nanoparticles: Capping action of citrate
    Henglein, A
    Giersig, M
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (44): : 9533 - 9539
  • [9] Synthesis, properties, and applications of iron nanoparticles
    Huber, DL
    [J]. SMALL, 2005, 1 (05) : 482 - 501
  • [10] INT CTR DIFFRACTION, 1991, Patent No. 060696