Molecular Mobility of Amorphous Chain Segments of Ethylene−Methyl Methacrylate Copolymer Films as a Function of Temperature Estimated by Positron Annihilation, X-ray Diffraction, and13C NMR

2003 ◽  
Vol 36 (21) ◽  
pp. 8056-8065 ◽  
Author(s):  
Lin Ma ◽  
Chunqing He ◽  
Takenori Suzuki ◽  
Mami Azuma ◽  
Yuezhen Bin ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Positron Annihilation ◽  
Molecular Mobility ◽  
X Ray Diffraction ◽  
X Ray ◽  
Copolymer Films ◽  
Methacrylate Copolymer

Study of various types of diamonds by measurements of double crystal x‐ray diffraction and positron annihilation

1995 ◽  
Vol 78 (3) ◽  
pp. 1510-1513 ◽  
Author(s):  
S. Fujii ◽  
Y. Nishibayashi ◽  
S. Shikata ◽  
A. Uedono ◽  
S. Tanigawa
Keyword(s):  
Positron Annihilation ◽  
X Ray Diffraction ◽  
Double Crystal ◽  
X Ray

Properties of Carbon Nanofibers Prepared from Polyacrylonitrile/Poly(methyl Methacrylate) Blend

2009 ◽  
Vol 79-82 ◽  
pp. 353-356
Author(s):  
Wei Pan ◽  
Yan Chen ◽  
Xiao Wei He
Keyword(s):  
Methyl Methacrylate ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Nitrogen Atmosphere ◽  
Wet Spinning ◽  
X Ray Diffraction ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Graphite Crystallite ◽  
Raman Microspectrometry

The polyacrylonitrile(PAN)/poly (methyl methacrylate)(PMMA) blend fibers were prepared by wet-spinning technique and carbonized over the temperature range of 400-1000°C in nitrogen atmosphere. After carbonization of the blend fibers, the PMMA component removed and the PAN component left in the form of carbon nanofibers. Morphology of the carbon nanofibers were investigated via scanning electron microscopy (SEM), and the carbonization behavior of the fibers were examined via x-ray diffraction (XRD), Raman microspectrometry. The optimal condition made carbon fibers with great L/D ratio and diameter less than 200 nm. XRD and Raman spectra shows that the PAN/PMMA blend fibers treated at 600°C produced some graphite crystallite.

Positron annihilation and X-ray diffraction studies of cellulose and some derivatives

1984 ◽  
Vol 16 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Stephen Doyle ◽  
Bansi D. Malhotra ◽  
Norman Peacock ◽  
Richard A. Pethrick
Keyword(s):  
Positron Annihilation ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Preparation and Characterization of Zinc Oxide (Zno)/Polymethyl Methacrylate (PMMA) Nanocomposites

2021 ◽  
Vol 04 (04) ◽  
Author(s):  
Jayashree Bagawade ◽  
Keyword(s):  
Zinc Oxide ◽  
Methyl Methacrylate ◽  
Zinc Oxide Nanoparticles ◽  
Nanocomposite Films ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Poly Methyl Methacrylate ◽  
Absorption Measurements

A series of novel zinc oxide / Poly (methyl methacrylate) nanocomposite films with different ZnO contents were prepared through inclusion of pre-synthesized zinc oxide nanoparticles. The physical composition and morphology of the as-prepared nanocomposites were studied by XRD and TEM. The TEM analyses revealed that the zinc oxide nanoparticles have a particle size of ~3–5 nm. X-ray diffraction proved the presence of the amorphous PMMA in the nanocomposites. The intermolecular interactions within the polymer nanocomposites were explored by FTIR and XRD. FTIR spectra confirmed the dispersion of the zinc oxide nanoparticles in the Poly (methyl methacrylate) i.e. PMMA matrices. The UV-Vis absorption measurements of the ZnO/PMMA nanocomposites proved their potential optical properties.

Defect evolution in Eu3+, Nb5+ doped and co-doped CeO2: X-ray diffraction, positron annihilation lifetime and photoluminescence studies

2019 ◽  
Vol 6 (8) ◽  
pp. 2167-2177 ◽  
Author(s):  
K. Sudarshan ◽  
V. Tiwari ◽  
P. Utpalla ◽  
S. K. Gupta
Keyword(s):  
Positron Annihilation ◽  
Rietveld Refinement ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
Doped Ceo2 ◽  
Photoluminescence Studies ◽  
Co Doped

Defects and their influence on light emitting properties were explored in CeO2:Eu,Nb using Rietveld refinement, positron annihilation and luminescence spectroscopy.

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