نتایج جستجو برای: nanoscale fe particles

تعداد نتایج: 254004  

2017
Chang Hyuck Choi Won Seok Choi Olga Kasian Anna K Mechler Moulay Tahar Sougrati Sebastian Brüller Kara Strickland Qingying Jia Sanjeev Mukerjee Karl J J Mayrhofer Frédéric Jaouen

Fe-N-C catalysts with high O2 reduction performance are crucial for displacing Pt in low-temperature fuel cells. However, insufficient understanding of which reaction steps are catalyzed by what sites limits their progress. The nature of sites were investigated that are active toward H2 O2 reduction, a key intermediate during indirect O2 reduction and a source of deactivation in fuel cells. Cat...

2010
Mary Caldorera-Moore Min Kyoo Kang Zachary Moore Vikramjit Singh S. V. Sreenivasan Li Shi Rui Huang Krishnendu Roy

Recently a number of hydrogel-based microand nanoscale drug carriers have been reported including top down fabricated, highly monodisperse nanoparticles of specific sizes and shapes. One critical question on such approaches is whether in vivo swelling of the nanoparticles could considerably alter their geometry to a point where the potential benefit of controlling size or shape could not be rea...

ژورنال: سنجش و ایمنی پرتو 2018

The neutron collision cross-section is important in neutron use for a specific job, such as neutron therapy or even in nuclear reactors. In calculating computational codes such as MCNP, only information from the neutron-to-mass collision information contained in the computational code library is used, in the case of nanoscale particles in contrast to the mass of materials and / or particulate m...

Journal: :Nano letters 2013
Jeong Ho Mun Yun Hee Chang Dong Ok Shin Jong Moon Yoon Dong Sung Choi Kyung-Min Lee Ju Young Kim Seung Keun Cha Jeong Yong Lee Jong-Ryul Jeong Yong-Hyun Kim Sang Ouk Kim

Nanoscale alloys attract enormous research attentions in catalysis, magnetics, plasmonics and so on. Along with multicomponent synergy, quantum confinement and extreme large surface area of nanoalloys offer novel material properties, precisely and broadly tunable with chemical composition and nanoscale dimension. Despite substantial progress of nanoalloy synthesis, the randomized positional arr...

2017
Shichao Yan Luigi Malavolti Jacob A J Burgess Andrea Droghetti Angel Rubio Sebastian Loth

The ability to sense the magnetic state of individual magnetic nano-objects is a key capability for powerful applications ranging from readout of ultradense magnetic memory to the measurement of spins in complex structures with nanometer precision. Magnetic nano-objects require extremely sensitive sensors and detection methods. We create an atomic spin sensor consisting of three Fe atoms and sh...

2014
Sergey I Popel Vitaly V Adushkin Anatoly P Golub'

BACKGROUND Cavitation is a rather common and important effect in the processes of destruction of nano- and microscale particles in natural and technological processes. A possible cavitation disintegration of polymineral nano- and microparticles, which are placed into a liquid, as a result of the interaction of the particles with collapsed cavitation bubbles is considered. The emphasis is put on...

2015
Marina Tyunina Lide Yao Dagmar Chvostova Alexandr Dejneka Tomas Kocourek Miroslav Jelinek Vladimir Trepakov Sebastiaan van Dijken

Perovskite-type ferroelectric (FE) crystals are wide bandgap materials with technologically valuable optical and photoelectric properties. Here, versatile engineering of electronic transitions is demonstrated in FE nanofilms of KTaO3, KNbO3 (KNO), and NaNbO3 (NNO) with a thickness of 10-30 unit cells. Control of the bandgap is achieved using heteroepitaxial growth of new structural phases on Sr...

2016
F. Novio J. Simmchen N. Vazquez

Coordination polymer particles (CPPs) have recently emerged as a new family of nanoparticles. The potential multifunctionality of these nanosystems and the flexibility of their coordination chemistry open new perspectives in different fields, including medicine. This review outlines the most recent advances in this field, from CPP synthesis to their use as smart drug delivery systems, bioimagin...

Journal: :The Analyst 2013
Haihan Chen Vicki H Grassian Laxmikant V Saraf Alexander Laskin

Airborne fly ash from coal combustion may represent a source of bioavailable iron (Fe) in the open ocean. However, few studies have focused on Fe speciation and distribution in coal fly ash. In this study, chemical imaging of fly ash has been performed using a dual-beam focused ion beam/scanning electron microscope (FIB/SEM) system for a better understanding of how simulated atmospheric process...

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