Ammonia absorption in calcium graphite intercalation compound: in situ neutron diffraction, Raman spectroscopy and magnetization

2010 ◽  
Vol 12 (23) ◽  
pp. 6253 ◽  
Author(s):  
G. Srinivas ◽  
A. Lovell ◽  
N. T. Skipper ◽  
S. M. Bennington ◽  
Z. Kurban ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Neutron Diffraction ◽  
Intercalation Compound ◽  
Graphite Intercalation Compound ◽  
Graphite Intercalation ◽  
Ammonia Absorption ◽  
In Situ Neutron Diffraction

scholarly journals Highly Enhancing Electrical, Thermal, and Mechanical Properties of Polypropylene/Graphite Intercalation Compound Composites by In Situ Expansion during Melt Mixing

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3095
Author(s):  
Zhifeng Wang ◽  
Jun Tong ◽  
Wei Li ◽  
Haichen Zhang ◽  
Manfeng Hu ◽  
...  
Keyword(s):  
Intercalation Compound ◽  
Interlamellar Spacing ◽  
Graphite Intercalation Compound ◽  
Thermal And Mechanical Properties ◽  
Melt Mixing ◽  
Graphite Intercalation ◽  
Different Temperatures ◽  
Thermal Stability Of ◽  
Nucleation Point

Polypropylene/graphite intercalation compound (PP/GIC) composites are prepared via melt mixing at three different temperatures (180, 200, and 220 °C). The dispersion of GICs in the composites is clearly improved due to the increased interlamellar spacing caused by in situ expansion of GICs at higher temperatures, which facilitates the intercalation of PP molecular chains into the GIC galleries. As a result, the PP/GIC composite with 10 wt% GICs prepared at 220 °C (PG220) presents a dielectric constant of about 1.3 × 108 at 103 Hz, which is about six orders higher than that of the composite prepared at 180 °C (PG180). Moreover, the thermal conductivity of the PG220 sample (0.63 Wm−1K−1) is 61.5% higher than that of the PG180 sample. The well-dispersed GICs accelerates the crystallization of PP by increasing the nucleation point and enhances the thermal stability of the composites. The PG220 sample shows a Young’s modulus that is about 21.2% higher than that of the PG180 samples. The results provide an efficient approach for fabricating polymer/GIC composites without complex exfoliation and dispersion processes.

X-ray diffraction and Raman scattering studies of FeCl3–SbCl5-graphite bi-intercalation compounds

1996 ◽  
Vol 11 (12) ◽  
pp. 3039-3044 ◽  
Author(s):  
Takeshi Abe ◽  
Yasukazu Yokota ◽  
Yasuo Mizutani ◽  
Mitsuru Asano ◽  
Toshio Harada ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Raman Scattering ◽  
Intercalation Compound ◽  
Stacking Sequence ◽  
Graphite Intercalation Compound ◽  
X Ray Diffraction ◽  
X Ray ◽  
Graphite Intercalation ◽  
Two Peaks

X-ray diffraction (XRD) and Raman spectroscopy have been used for the study of the bi-intercalation of SbCl5 into a stage 5 FeCl3-graphite intercalation compound (GIC). The stage 5 FeCl3-GIC is prepared by an ordinary two-bulb method with the temperature of graphite at 788 K and that of FeCl3 at 573 K. The FeCl3-SbCl5-graphite bi-intercalation compound (GBC) with one SbCl5 layer is obtained when the temperature of the stage 5 FeCl3-GIC is held at 443 K and the temperature of SbCl5 at 373 K in the two-zone system. The stacking sequence of the GBC is found to be an admixture of G(FeCl3)GG(SbCl5)GGG(FeCl3)G and G(FeCl3)GGG(SbCl5)GG(FeCl3)G by XRD, where G, (FeCl3), and (SbCl5) are the graphite, FeCl3, and SbCl5 layers, respectively. The Raman spectrum of the GBC shows two peaks associated with the and modes at 1588 cm−1 and 1610 cm−1, respectively. For the temperatures of stage 5 FeCl3-GIC at 443 K and SbCl5 at 403 K in the two-zone system, the FeCl3-SbCl5-GBC with two SbCl5 layers is obtained. The stacking sequence of the GBC is determined to be an admixture of G(FeCl3)GG(SbCl5)GG(SbCl5)G(FeCl3)G and G(FeCl3)G(SbCl5)GG(SbCl5)GG(FeCl3)G In the Raman spectrum of this GBC, two peaks associated with the mode are observed at 1616 and 1624 cm−1.

Graphite intercalation compound (GIC) crystal monochromators for cold neutron instruments: Characterization of KC24 by time-of-flight neutron diffraction

2021 ◽  
Vol 92 (2) ◽  
pp. 023306
Author(s):  
Andrew J. C. Dennison ◽  
Anton Devishvili ◽  
Philipp Gutfreund ◽  
Robert Cubitt ◽  
Alexei Vorobiev ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Cold Neutron ◽  
Time Of Flight ◽  
Intercalation Compound ◽  
Graphite Intercalation Compound ◽  
Graphite Intercalation
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