نتایج جستجو برای: tem transmission electron microscopy

تعداد نتایج: 631869  

2009
Alfredo González-Pérez

1. Abstract 2. Introduction 3. Experimental 3.1. Materials 3.2. Sample preparation 3.3. Fluorescence microscopy 3.4. Negative staining TEM 3.5. Cryo-transmission electron microscopy (cryo-TEM) 4. Results and discussion 4.1. From globule to coil: A non-first order transition 4.2. DNA interaction with CTAB and β-CD 4.3. β-CD as a decompacting agent 5. Conclusions and perspectives 6. Acknowledgeme...

Journal: :Nanoscale 2013
Aaron H Colby Yolonda L Colson Mark W Grinstaff

Polymeric expansile nanoparticles (eNPs) that respond to a mildly acidic environment by swelling with water and expanding 2-10× in diameter represent a new responsive drug delivery system. Here, we use a variety of techniques to characterize the pH- and time-dependence of eNP swelling as this is a key property responsible for the observed in vitro and in vivo performance of eNPs. Results demons...

F. A. Hesari, F. S. Torknik M. Moradi,

Size, shape, volume fraction and distribution of embedded g/ phase in g phase has direct effect on strength of INCONEL alloy. Microstructure parameters of INCONEL phases are quantified from microstructure images using transmission electron microscopy (TEM). Different TEM sample preparation techniques were used to study INCONEL 738 alloy microstructure for transmission electron micros...

2013
Farhang Nabiei Cecile Hebert Marco Cantoni Paul Bowen Tewari Abhishek

Qualitative EDX analysis: A map is acquired in low magnification. Results show equiaxial grains finely distributed through out the sample. In spite of the fact that simulations indicate no clear energetic gain or loss for cosegreation over single dopant segregation in this material, we observed that in all grain boundaries these two dopants (Y an La) are segregating together (figure 2). This co...

2011
G. F. Iriarte

The transmission electron microscope (TEM) is an invaluable tool for the characterization of crystals, polycrystalline materials, biological specimens, nanostructures etc. It provides a wide range of different imaging modes with the ability to provide information on elemental composition and electronic structure at the ultimate sensitivity, that of a single atom. Convergent beam electron diffra...

B. Sathyaseelan K. Sivakumar, S. Sambasivam T. Alagesan

Nanocrystalline particles of Cerium Oxide (CeO2) have been prepared by the chemical precipitation method using Cerium nitrate and Urea with a molar ratio of 1:2. The results revealed that the formation of CeO2 fine particles is influenced by molar ratio of metal nitrates to fuel. Well faceted CeO2 nanoparticles, were synthesized by thermal-assisted dissociation ...

2009

Metallic nanoparticles of Au, Pt and Pt/Au have been synthesized using a chemical reduction approach. The structural characterization of these metallic nanoparticles has been carried out using conventional transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HR-TEM) techniques. HR-TEM images of Pt nanoparticles reveal their fcc-like structures, in the [10...

2013
Bo Yang Terry L. Alford

Spectroscopy to characterize several functional materials. Along with the fast development of science and technology, the studied materials is becoming more complicated and smaller. All these achievements has advanced with the fast development of powerful tools currently, such as Scanning electron microscopy(SEM), Focused Ion Beam(FIB), Transmission electron microscopy(TEM), Electron energy los...

2017
Trevor P. Almeida Hitoshi Suzuki Masayuki Shintaku Takeshi Sato Damien McGrouther Hugo Perez Garza Jamie Massey Christopher H. Marrows Stephen McVitie

The preparation of a planar FeRh thin film using a focused ion beam (FIB) secondary electron microscope (SEM) for the purpose of in situ transmission electron microscopy (TEM) is presented. A custom SEM stub with 45° faces allows for the transfer and milling of the sample on a TEM heating chip, whilst Fresnel imaging within the TEM revealed the presence of the magnetic domain walls, confirming ...

Journal: :Journal of bacteriology 1973
L T Talens M W Miller M Miranda

Internal and surface structures of asci and ascospores were studied by transmission electron microscopy (TEM) and by scanning electron microscopy (SEM) to establish the character and number of ascospores within the ascus of Metschnikowia krissii. Enzyme digestion with snail gut enzymes and SEM examination suggested the presence of a single ascospore enclosed in a thick sheath of epiplasmic mate...

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