scholarly journals Size-dependent structural evolution of the biomineralized iron-core nanoparticles in ferritins

2013 ◽  
Vol 102 (13) ◽  
pp. 133703 ◽  
Author(s):  
Eunsook Lee ◽  
D. H. Kim ◽  
Jihoon Hwang ◽  
Kiho Lee ◽  
Sungwon Yoon ◽  
...  
Keyword(s):  
Structural Evolution ◽  
Iron Core ◽  
Size Dependent ◽  
Core Nanoparticles

Poly(vinylpyrrolidone) Coated Iron Nanoparticles in Polar Aprotic Solvent

2008 ◽  
Vol 8 (4) ◽  
pp. 2091-2095 ◽  
Author(s):  
Zhihui Ban ◽  
Brian L. Cushing ◽  
Charles J. O'Connor
Keyword(s):  
Iron Nanoparticles ◽  
Aprotic Solvent ◽  
Shell Structures ◽  
Iron Core ◽  
Capping Agent ◽  
Squid Magnetometry ◽  
X Ray ◽  
Transmission Electron ◽  
Polar Aprotic Solvent ◽  
Core Nanoparticles

Poly(vinylpyrrolidone) (PVP) coated iron nanoparticles which show well-defined core–shell structures have been successfully synthesized in a polar aprotic solvent. In this approach, PVP was employed not as capping agent, but as coating polymer directly applied to the metallic (iron) core nanoparticles. The morphologies, structures, compositions and magnetic properties of the products were investigated by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), energy dispersive X-ray spectroscopy (EDXS), SQUID magnetometry and FTIR spectroscopy.

Competition between tubular, planar and cage geometries: a complete picture of structural evolution of Bn (n = 31–50) clusters

2020 ◽  
Vol 22 (23) ◽  
pp. 12959-12966 ◽  
Author(s):  
Xue Wu ◽  
Linwei Sai ◽  
Si Zhou ◽  
Panwang Zhou ◽  
Maodu Chen ◽  
...  
Keyword(s):  
Theoretical Prediction ◽  
Experimental Finding ◽  
Structural Evolution ◽  
Research Interest ◽  
Complete Picture ◽  
Boron Clusters ◽  
Intensive Research ◽  
Size Dependent

Stimulated by the early theoretical prediction of B80 fullerene and the experimental finding of the B40 cage, the structures of medium-sized boron clusters have attracted intensive research interest during the last decade, but a complete picture of their size-dependent structural evolution remains a puzzle.

scholarly journals Radiosensitizing Effect of Iron-Core Nanoparticles on Neuroblastoma Cells

2015 ◽  
Vol 93 (3) ◽  
pp. E545-E546
Author(s):  
W. Omar ◽  
A. Meleis ◽  
M. Zoheir ◽  
N. Zahran ◽  
R. Bazak ◽  
...  
Keyword(s):  
Neuroblastoma Cells ◽  
Iron Core ◽  
Radiosensitizing Effect ◽  
Core Nanoparticles

Little things make big things happen

2020 ◽  
Vol 12 (570) ◽  
pp. eabf4689
Author(s):  
Steven P. Keller
Keyword(s):  
Magnetic Fields ◽  
Iron Core ◽  
Injured Tissue ◽  
Core Nanoparticles

Iron core nanoparticles can serve as vesicle shuttles and be guided by external magnetic fields to deliver therapeutic exosomes to injured tissue.

Size-Dependent Structural Evolution and Chemical Reactivity of Gold Clusters

ChemPhysChem ◽  
2007 ◽  
Vol 8 (1) ◽  
pp. 157-161 ◽  
Author(s):  
Bokwon Yoon ◽  
Pekka Koskinen ◽  
Bernd Huber ◽  
Oleg Kostko ◽  
Bernd von Issendorff ◽  
...  
Keyword(s):  
Chemical Reactivity ◽  
Structural Evolution ◽  
Gold Clusters ◽  
Size Dependent

scholarly journals A size-dependent structural evolution of ZnS nanoparticles

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Mohammad Khalkhali ◽  
Qingxia Liu ◽  
Hongbo Zeng ◽  
Hao Zhang
Keyword(s):  
Structural Evolution ◽  
Zns Nanoparticles ◽  
Size Dependent

Production and STEM examination of controlled-size silver clusters

1983 ◽  
Vol 41 ◽  
pp. 338-339
Author(s):  
M. A. Listvan ◽  
R. P. Andres
Keyword(s):  
Cluster Size ◽  
Metal Clusters ◽  
Experimental Parameter ◽  
Carbon Films ◽  
Metal Species ◽  
Silver Clusters ◽  
Free Jet ◽  
Size Dependent ◽  
Cluster Properties ◽  
Controllable Size

Knowledge of the function and structure of small metal clusters is one goal of research in catalysis. One important experimental parameter is cluster size. Ideally, one would like to produce metal clusters of regulated size in order to characterize size-dependent cluster properties.A source has been developed which is capable of producing microscopic metal clusters of controllable size (in the range 5-500 atoms) This source, the Multiple Expansion Cluster Source, with a Free Jet Deceleration Filter (MECS/FJDF) operates as follows. The bulk metal is heated in an oven to give controlled concentrations of monomer and dimer which were expanded sonically. These metal species were quenched and condensed in He and filtered to produce areosol particles of a controlled size as verified by mass spectrometer measurements. The clusters were caught on pre-mounted, clean carbon films. The grids were then transferred in air for microscopic examination. MECS/FJDF was used to produce two different sizes of silver clusters for this study: nominally Ag6 and Ag50.

Transfer Technique for Electron Microscopy of Membrance Filter Samples

1974 ◽  
Vol 32 ◽  
pp. 554-555
Author(s):  
Lawrence W. Ortiz ◽  
Bonnie L. Isom
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Pore Size ◽  
Membrane Filters ◽  
Size Dependent

A procedure is described for the quantitative transfer of fibers and particulates collected on membrane filters to electron microscope (EM) grids. Various Millipore MF filters (Millipore AA, HA, GS, and VM; 0.8, 0.45, 0.22 and 0.05 μm mean pore size) have been used with success. Observed particle losses have not been size dependent and have not exceeded 10%. With fibers (glass or asbestos) as the collected media this observed loss is approximately 3%.

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

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