Comparative study of two polymer carbon nanotube composites using electron paramagnetic resonance and transmission electron microscopy

2003 ◽  
Author(s):  
Robert J. Murphy ◽  
Jonathan N. Coleman ◽  
Sean M. O'Flaherty ◽  
Martin Cadek ◽  
Brendan McCarthy ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Carbon Nanotube ◽  
Comparative Study ◽  
Paramagnetic Resonance ◽  
Transmission Electron ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Electron Paramagnetic

scholarly journals Mineral-polymer composites based on hydroxyapatite with polyvynylpyrrolidon for medicine

2019 ◽  
Vol 487 (3) ◽  
pp. 270-274
Author(s):  
I. V. Fadeeva ◽  
F. I. Grabovenko ◽  
A. S. Fomin ◽  
S. M. Barinov ◽  
F. F. Murzakhanov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Epr Spectroscopy ◽  
Coherent Scattering ◽  
Coherent Scattering Region ◽  
Paramagnetic Resonance ◽  
Transmission Electron ◽  
Electron Paramagnetic ◽  
Photoinduced Epr

Composites of hydroxyapatite (HA) with polyvinylpyrrolidone (PVP) were synthesized by precipitation in water solutions, mass relations of HA/PVP varied in region 3,6-14,5. The composite materials were investigated using XRD, IR, electron paramagnetic resonance (EPR) spectroscopy and transmission electron microscopy (TEM). Based on the TEM results it was found that during calcination of composites at 400 °C small agglomerates consisting of individual crystalline HA particles were formed, resulting in a particle size (according to TEM) slightly larger than coherent scattering region. Using the method of photoinduced EPR spectroscopy confirmed the presence of interaction between HA and PVP. The resulting composites can be used as materials for reconstructive surgery.

Buckypaper/DYAD/Buckypaper and Buckypaper/DYAD/ (polyaniline/multiwalled carbon nanotube) composite sensors: Preparation and damping properties characterization

2017 ◽  
Vol 52 (11) ◽  
pp. 1457-1464
Author(s):  
Weiwei Lin ◽  
Yonatan Rotenberg ◽  
Hadi Fekrmandi ◽  
Cesar Levy
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
Damping Ratio ◽  
Multiwalled Carbon Nanotube ◽  
Layer By Layer ◽  
Test Results ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Nanotube Composites ◽  
Matrix Free

Buckypaper/DYAD/Buckypaper and Buckypaper/DYAD/(polyaniline/multiwalled carbon nanotube) composites films were made by frit compression method and layer-by-layer attachment method. Transmission electron microscopy and scanning electron microscopy were used to study the morphology properties of polyaniline/multiwalled carbon nanotube and the results showed that carbon nanotubes were well dispersed in the polymer matrix. Free vibration test results showed that the double-sided attachment of the sensor had higher damping ratio values than single-sided attachment. Also, damping ratios were higher when the composite sensor was placed at the beam's clamped end. Furthermore, the Buckypaper/DYAD/(polyaniline/multiwalled carbon nanotube) combination exhibited higher damping ratios than the other cases tested. Thus, these samples have the potential of being simultaneously strain sensors and dampers.

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