Radiation – induced preparation of polyaniline/poly vinyl alcohol nanocomposites and their properties

2019 ◽  
Vol 107 (8) ◽  
pp. 725-735
Author(s):  
Hoda H. Saleh ◽  
Rehab Sokary ◽  
Zakaria I. Ali
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Vinyl Alcohol ◽  
Oxidative Polymerization ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
Transmission Electron ◽  
Scanning Electron

Abstract Polyaniline (PANI) nanoparticles and PANI/poly vinyl alcohol (PVA) nanocomposite films were synthesized by the oxidative polymerization of aniline and ammonium peroxodisulfate (APS), as an oxidizing agent in aqueous medium. The PANI/PVA nanocomposite films were exposed to γ-irradiation after oxidative polymerization. Synthesized polyaniline (PANI) nanoparticles and PANI/PVA nanocomposite films were characterized by attenuated total reflectance infrared spectroscopy (FTIR-ATR), X-ray diffraction, high resolution scanning electron microscopy, (HRSEM) high resolution transmission electron microscopy, (HRTEM) and UV-VIS absorption spectroscopy. Energy band gap of PANI nanofibers was determined from Tauc’s plots which equal 4.2 eV. Scanning electron microscopy images show that chemically synthesized of polyaniline has nanofibers structure and irradiated PANI/PVA nanocomposite have a mixture of nanorod and nanosphere structures. The transmission electron microscopy show that chemically synthesized of polyaniline has average length in the range 34 ± 10 nm with less wide distribution, where as the irradiated PANI/PVA nanocomposite has coreshell structure.

scholarly journals Mitochondria of Human Adrenal Cortex Have Tubular Cristae with Bulbous Tips

2003 ◽  
Vol 88 (4) ◽  
pp. 1903-1906 ◽  
Author(s):  
Alessandro Riva ◽  
Felice Loffredo ◽  
Alessandro Uccheddu ◽  
Francesca Testa Riva ◽  
Bernard Tandler
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Adrenal Cortex ◽  
Thin Sections ◽  
Transmission Electron ◽  
Soluble Material ◽  
Bulbous Tip ◽  
Scanning Electron

By taking advantage of a modified osmium maceration technique, we have been able to examine by high resolution scanning electron microscopy (HRSEM) the interior of human adrenocortical mitochondria from which all soluble material has been extracted. The so-called vesicles apparent in thin sections examined by transmission electron microscopy actually are finger-like cristae as determined by HRSEM. These digitiform cristae have a segmented appearance and a bulbous tip. The segmented form of the cristae may have important metabolic implications.

Synthesis of Polyaniline Nanofibrous Networks with the Aid of an Amphiphilic Ionic Liquid

2006 ◽  
Vol 6 (1) ◽  
pp. 227-230 ◽  
Author(s):  
Zhenjiang Miao ◽  
Yong Wang ◽  
Zhimin Liu ◽  
Jun Huang ◽  
Buxing Han ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ionic Liquid ◽  
Oxidative Polymerization ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Transmission Electron ◽  
Scanning Electron

In this work, polyaniline (PANI) nanofibrous networks were prepared using ionic liquid (IL), 1-hexadecyl-3-methylimidazolium chloride (C16MIMCl), as a template through oxidative polymerization of aniline with ammonium persulfate. The resulting PANI was characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis, and FTIR. It was indicated that the as-prepared PANI was in the emeraldine form and its morphology strongly depended on the molar ratio of aniline/C16MIMCl. A possible mechanism for the formation of PANI nanofibrous networks was that the ordered micro-domains of the IL acted as template to direct the growth of the nanostructures.

scholarly journals A Rational Self-Sacrificing Template Route toLiMn2O4Nanotubes and Nanowires

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
Baojun Yang ◽  
Xinsong Yuan ◽  
Duoli Chai
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Spinel Phase ◽  
Synthesis Method ◽  
Molten Salt Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Single-crystallineLiMn2O4nanotubes and nanowires have been synthesized via a low-temperature molten salt synthesis method, using the preparedβ-MnO2nanotubes andα-MnO2nanowires as the precursors and self-sacrificing template. The materials were investigated by a variety of techniques, including X-ray powder diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). The results indicate that the preparedLiMn2O4nanotube and nanowire samples are both spinel phase, have lengths up to several micrometers and diameters of hundreds and tens of nanometers, respectively.

Image simulation in scanning electron microscopy

1987 ◽  
Vol 45 ◽  
pp. 74-75
Author(s):  
David C Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Image Interpretation ◽  
Image Simulation ◽  
Dimensional Metrology ◽  
Transmission Electron ◽  
Contrast Mechanisms ◽  
Scanning Electron

Image simulation, as a means of image interpretation, has been an important component of high resolution transmission electron microscopy for many years. By contrast scanning electron microscopists have relied almost exclusively on simple visual analogies to understand the micrographs that they produce. However with the development of SEMs capable of near atomic levels of resolution, and with the requirement for accurate dimensional metrology of sub-micron features in semiconductor devices using the SEM, a more quantitative approach to image formation and analysis is needed.Image simulation in the SEM encounters several special problems. Firstly, the signal displayed to form the micrograph is not well defined in terms of either the contrast mechanisms which give rise to it, or the energy and origin of the electrons actually collected to produce the signal.

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