Friday 30 June 2017

Surface design of magnetic nanoparticles for stimuli-responsive cancer imaging and therapy

Surface design of magnetic nanoparticles for stimuli-responsive cancer imaging and therapy
Taegyu Kang, Fangyuan Li, Seungmin Baik, Wei Shao, Daishun Ling, Taeghwan Hyeon
Biomaterials 136, 98 (2017)

Thermal Decomposition Synthesis of Iron Oxide Nanoparticles with Diminished Magnetic Dead Layer by Controlled Addition of Oxygen - ACS Nano (ACS Publications)

Thermal Decomposition Synthesis of Iron Oxide Nanoparticles with Diminished Magnetic Dead Layer by Controlled Addition of Oxygen.
Mythreyi Unni,Amanda M. Uhl, Shehaab Savliwala, Benjamin H. Savitzky, Rohan Dhavalikar, Nicolas Garraud, David P Arnold, Lena F. Kourkoutis, Jennifer S. Andrew, and Carlos Rinaldi
Decades of research focused on size and shape control of iron oxide nanoparticles have led to methods of synthesis that afford excellent control over physical size and shape but comparatively poor control over magnetic properties. Popular synthesis methods based on thermal decomposition of organometallic precursors in the absence of oxygen have yielded particles with mixed iron oxide phases, crystal defects, and poorer than expected magnetic properties, including the existence of a thick “magnetically dead layer” experimentally evidenced by a magnetic diameter significantly smaller than the physical diameter. Here, we show how single-crystalline iron oxide nanoparticles with few defects and similar physical and magetic diameter distributions can be obtained by introducing molecular oxygen as one of the reactive species in the thermal decomposition synthesis. This is achieved without the need for any postsynthesis oxidation or thermal annealing. These results address a significant challenge in the synthesis of nanoparticles with predictable magnetic properties and could lead to advances in applications of magnetic nanoparticles.


Standardizing Size- and Shape-Controlled Synthesis of Monodisperse Magnetite (Fe3O4) Nanocrystals by Identifying and Exploiting Effects of Organic Impurities

Standardizing Size- and Shape-Controlled Synthesis of Monodisperse Magnetite Nanocrystals by Identifying and Exploiting Effects of Organic Impurities.
Liang Qiao, Zheng Fu, Ji Li, John Ghosen, Ming Zeng, John Stebbins, Paras N. Prasad, and Mark T. Swihart

Size-Dependent Heating of Magnetic Iron Oxide NP

Size-Dependent Heating of Magnetic Iron Oxide Nanoparticles.
Sheng Tong, Christopher A. Quinto, Linlin Zhang, Priya Mohindra, and Gang Bao

Tuesday 6 June 2017

Single crystalline cylindrical nanowires – toward dense 3D arrays of magnetic vortices : Scientific Reports

Single crystalline cylindrical nanowires – toward dense 3D arrays of magnetic vortices.
Yurii P. Ivanov, Andrey Chuvilin, Laura G. Vivas, Jurgen Kosel, Oksana Chubykalo-Fesenko & Manuel Vázquez
Scientific Reports 6, Article number: 23844 (2016)
Scientific Reports 6, 23844 (2016)
(a) Calculated dependence of the total energy of the vortex and non-vortex state on the length of NWs. (b) The nucleation field of the vortex and the switching field for the vortex core as a function of NW length after saturation in 1 T parallel to the NW axis. (c) Simulated magnetization of single-crystal hcp Co NW with a 75-nm diameter, depending on the length of the NW.