نتایج جستجو برای: Nanocrystal

تعداد نتایج: 3002  

Corncob is one of the industrial waste has cellulose content of 39.1 wt%, which makes it has high potential to be a raw material in the production of cellulose nanocrystal. Corncob was delignificated with 3.5 wt% HNO3 and NaNO2 10 mg, precipitated process with 17.5 wt% NaOH, and bleached with 10 wt% H2O2. Cellulose nanocrystal was obtained by hydrolysis using 45 wt% H2SO4. Corncob and cellulose...

حسن ربانی, , فاطمه آقابابایی, , محمد مردانی, ,

In this paper, we investigate the electrical conductance and density of states of a nanocrystal including an electrical charge or dipole located at cross section of nanocrystal by using Green’s function method in the nearest neighbor tight-binding approach. The results show that moving the electrical charge from center to the edge of the nanocrystal increases the system transmission coefficient...

ژورنال: دانشور پزشکی 2016
حاجی زاده مقدم, اکبر, حسینی, راضیه, زارع, محبوبه, میرمحمدرضایی, فرشیه,

Background and Objective: Schizophrenia is a chronic debilitating psychiatric disorder, that one of its causative factors is hypoactive N-methyl-D-aspartate receptors. Quercetin is a flavonoid that has shown several pharmacological activities such as antioxidant properties and is found in vegetables and fruits. This study was performed with the aim of evaluation of the neuroprotective effect of...

Journal: :Science 2000
V I Klimov A A Mikhailovsky S Xu A Malko J A Hollingsworth C A Leatherdale H Eisler M G Bawendi

The development of optical gain in chemically synthesized semiconductor nanoparticles (nanocrystal quantum dots) has been intensely studied as the first step toward nanocrystal quantum dot lasers. We examined the competing dynamical processes involved in optical amplification and lasing in nanocrystal quantum dots and found that, despite a highly efficient intrinsic nonradiative Auger recombina...

2013
Sinisa Coh Steven G. Louie Marvin L. Cohen

We use a first-principles based kinetic Monte Carlo simulation to study the movement of a solid iron nanocrystal inside a carbon nanotube driven by the electrical current. The origin of the iron nanocrystal movement is the electromigration force. Even though the iron nanocrystal appears to be moving as a whole, we find that the core atoms of the nanocrystal are completely stationary, and only t...

Journal: :Nano letters 2008
Robert Y Wang Joseph P Feser Jong-Soo Lee Dmitri V Talapin Rachel Segalman Arun Majumdar

We examine the effect of strong three-dimensional quantum confinement on the thermopower and electrical conductivity of PbSe nanocrystal superlattices. We show that for comparable carrier concentrations PbSe nanocrystal superlattices exhibit a substantial thermopower enhancement of several hundred microvolts per Kelvin relative to bulk PbSe. We also find that thermopower increases monotonically...

Journal: :Physical review letters 2013
Sinisa Coh Will Gannett A Zettl Marvin L Cohen Steven G Louie

Under the application of electrical currents, metal nanocrystals inside carbon nanotubes can be bodily transported. We examine experimentally and theoretically how an iron nanocrystal can pass through a constriction in the carbon nanotube with a smaller cross-sectional area than the nanocrystal itself. Remarkably, through in situ transmission electron imaging and diffraction, we find that, whil...

Journal: :Angewandte Chemie 2010
Ravisubhash Tangirala Jessy L Baker A Paul Alivisatos Delia J Milliron

Inorganic nanocomposites have been prepared by assembling colloidal nanocrystals and then replacing the organic ligands with precursors to an inorganic matrix phase. Separate synthesis and processing of the nanocrystal and matrix phases allows complete compositional modularity and retention of the superlattice morphologies for sphere (see scheme; top) or rod (bottom) assemblies.

2006
Dengtao Zhao Yan Zhu Ruigang Li Jianlin Liu

Transient processes of Ge/Si hetero-nanocrystal floating gate memories are simulated numerically. Compared with Si nanocrystal memories, Ge/Si hetero-nanocrystal memories show similar writing and erasing efficiency with a weaker writing saturation and markedly improved retention characteristics. 2006 Elsevier Ltd. All rights reserved. PACS: 72.20.Jv; 73.21.La; 73.90.+f; 74.50.+r

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