共查询到20条相似文献,搜索用时 15 毫秒
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Todd C. Monson Qing Ma Tyler E. Stevens Judith M. Lavin Jean L. Leger Paul V. Klimov Dale L. Huber 《Particle & Particle Systems Characterization》2013,30(3):205-205
The behavior of iron nanoparticles is heavily influenced by their highly reactive surfaces. A better understanding of organic ligand/particle interactions must be achieved in order to synthesize iron nanoparticles with magnetic saturations (σ sat) equivalent to bulk iron. Even when synthesized using careful, air‐free chemistry techniques and ligands more weakly interacting than those often reported in the literature, the magnetic saturation of iron nanoparticles generally only approaches, but not equals, the magnetic saturation of bulk iron. Here, iron nanoparticles are synthesized using Schlenk line chemistry methods and two different weakly interacting ligands: 2,4‐pentanedione and hexaethylene glycol monododecylether. These particles have saturation magnetizations slightly lower than bulk iron, which is believed to be caused by interactions between the passivating ligands and the surface of the nanoparticles. Using X‐ray absorption fine structure studies, it is shown that oxidized species of iron exist at the nanoparticles’ surface and can be attributed to iron/ligand interaction. The percentage of oxidized species scales with the surface to volume ratio of the nanoparticles, and therefore appears limited to the nanoparticle surface. X‐ray absorption fine structure analysis also shows that the nanoparticles have an expanded crystalline lattice, which can further impact their magnetic properties. 相似文献
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Magnetic Nanoparticles: Uptake and Intracellular Fate of Peptide Surface‐Functionalized Silica Hybrid Magnetic Nanoparticles In Vitro (Part. Part. Syst. Charact. 2/2015) 下载免费PDF全文
Reinaldo G. Digigow Dimitri Vanhecke Barbara Rothen‐Rutishauser Martin J.D. Clift Alke Petri‐Fink 《Particle & Particle Systems Characterization》2015,32(2):135-135
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Simon Ullrich Sebastian P. Scheeler Claudia Pacholski Joachim P. Spatz Stefan Kudera 《Particle & Particle Systems Characterization》2013,30(1):2-2
A method for the production of homogeneous layers of nanoparticles of arbitrary shape is presented. The method relies on a ligand exchange with a functionalized polymer and a subsequent self‐assembly of a thin film on the substrates. The interparticle distances in the layer can be adjusted by the length of the polymer. In the case of spherical particles, the approach yields quasi‐hexagonal structures; in the case of anisotropic particles, the minimum distance between adjacent particles is controlled. Regular arrangements of the nanoparticles covering areas of several square centimeters are achieved. 相似文献
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Gold Nanoparticles: Fabrication of NIR‐Excitable SERS‐Active Composite Particles Composed of Densely Packed Au Nanoparticles on Polymer Microparticles (Part. Part. Syst. Charact. 4/2015) 下载免费PDF全文
Masaaki Kanahara Hiroki Satoh Takeshi Higuchi Atsushi Takahara Hiroshi Jinnai Koji Harano Satoshi Okada Eiichi Nakamura Yasutaka Matsuo Hiroshi Yabu 《Particle & Particle Systems Characterization》2015,32(4):401-401
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