X-ray tomography study of the random packing structure of ellipsoids

Soft Matter ◽  
2014 ◽  
Vol 10 (7) ◽  
pp. 990-996 ◽  
Author(s):  
Chengjie Xia ◽  
Kuan Zhu ◽  
Yixin Cao ◽  
Haohua Sun ◽  
Binquan Kou ◽  
...  
Keyword(s):  
Random Packing ◽  
X Ray ◽  
Packing Structure

Crystal structure of 3-chlorobenzo[b]thiophene-2-carbonyl chloride

2009 ◽  
Vol 2009 (7) ◽  
pp. 437-439 ◽  
Author(s):  
Sara Tarighi ◽  
Alireza Abbasi ◽  
Sara Zamanian ◽  
Alireza Badiei ◽  
Mahmood Ghoranneviss
Keyword(s):  
Crystal Structure ◽  
Mass Spectrometry ◽  
Cinnamic Acid ◽  
Thionyl Chloride ◽  
Structure Determination ◽  
X Ray ◽  
Packing Structure ◽  
H Nmr ◽  
Carbonyl Chloride ◽  
C Nmr

3-Chlorobenzo[b]thiophene-2-carbonyl chloride was synthesised from cinnamic acid and thionyl chloride. The single crystal X-ray structure determination confirmed the earlier proposed structure and the product was further characterised by 1H NMR, 13C NMR and mass spectrometry. The X-ray structure determination revealed two sets of symmetry related molecules along the b-axis that are loosely connected by relatively weak CH…π ( 3.626, 3.628 Å) interactions, giving rise to two infinite chains. The packing structure is dominated by Van der Waals forces between these chains. No significant π–π interactions are found in the crystal structure.

Model Calculation for the Fe80B20 Alloy Glass

1982 ◽  
Vol 37 (6) ◽  
pp. 611-612 ◽  
Author(s):  
T. Fujiwara ◽  
H. S. Chen ◽  
Y. Waseda
Keyword(s):  
Neutron Diffraction ◽  
Model Calculation ◽  
Radial Distribution ◽  
Short Distance ◽  
Random Packing ◽  
Distribution Functions ◽  
Radial Distribution Functions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Model Structures

Abstract Three partial radial distribution functions [RDF’s] are calculated by means of relaxed dense-random packing models for a Fe80B20 glass. The model structures reproduce fairly well recently reported experimental partial RDF's derived from x-ray diffraction and neutron diffraction using isotopic substitutional methods. Most significantly, both the model calculated by means of relaxed dense-random packing models GBB (r), the appearance of a subpeak on the short distance side of the first peak.

scholarly journals Packing structure of semiflexible rings

2020 ◽  
Vol 117 (7) ◽  
pp. 3382-3387 ◽  
Author(s):  
Leopoldo R. Gómez ◽  
Nicolás A. García ◽  
Thorsten Pöschel
Keyword(s):  
Short Range ◽  
Orientational Order ◽  
Cylindrical Container ◽  
Circular Dna ◽  
X Ray ◽  
Packing Structure ◽  
Disordered Structure ◽  
Topological Features ◽  
Minor Influence ◽  
Dynamical Description

Unraveling the packing structure of dense assemblies of semiflexible rings is not only fundamental for the dynamical description of polymer rings, but also key to understand biopackaging, such as observed in circular DNA of viruses or genome folding. Here we use X-ray tomography to study the geometrical and topological features of disordered packings of rubber bands in a cylindrical container. Assemblies of short bands assume a liquid-like disordered structure, with short-range orientational order, and reveal only minor influence of the container. In the case of longer bands, the confinement causes folded configurations and the bands interpenetrate and entangle. Most of the systems are found to display a threading network which percolates the system. Surprisingly, for long bands whose diameter is more than twice the diameter of the container, we found that all bands interpenetrate each other, in a complex fully entangled structure.

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