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The crystallographic structure of the natural air-hydrate in Greenland dye-3 deep ice core (1990)

Hondoh, T. ; Anzai, H. ; Goto, A. ; [et al.]

Springer

Journal of inclusion phenomena and macrocyclic chemistry 8 (1990), S. 17-24

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ISSN: 1573-1111

Keywords: Air-hydrate ; clathrate ; ice core ; guest molecule

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract We have carried out X-ray diffraction studies on single crystals of natural air-hydrate in deep ice cores recovered at Dye-3 Greenland. Integrated intensities for 470 diffracting planes were measured by an automated four-circle diffractometer. The space group determined is cubicFd3m and the lattice constant is 17.21(3) Å. These results indicate that the crystallographic structure is the Stackelberg's structure II, in contrast to the previously anticipated structure. This finding agrees with the recent results on the synthetic air-hydrate by Davidsonet al. It was also found by difference Fourier synthesis for guest molecules that electron density in a 16-hedral cage has multiple maxima displaced from the center of the cage while that in the 12-hedron was approximately spherical.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01131284

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Light scattering study of the swelling process of poly(acrylonitrile-co-butene)-graft-poly(acrylonitrile-co-methylacrylate) film (1994)

Goto, A. ; Kuwahara, N. ; Sato, H. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Polymer International 35 (1994), S. 219-224

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ISSN: 0959-8103

Keywords: copolymer ; film ; light scattering ; swelling ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The time evolution of the size and density of the swollen domains during the swelling of poly(acrylonitrile-co-butene)-graft-poly(acrylonitrile-co-methylacrylate) film in methanol was studied by light scattering measurements. The observed scattered light intensity was analyzed by the Guinier plot. The time evolution of the mean radius R(t) and number density N(t) of the swollen domains was given by R(t)3 ∼ t0.12 and N(t) ∼ t1.42.

Additional Material: 7 Ill.