Crystal Packing Driven Comparable Thermal Expansion of Polymorphs of a Tripodal Molecule and Guest-Dependent Expansion of Its Isostructural Solvates

2021 ◽  
Vol 21 (2) ◽  
pp. 1290-1296
Author(s):  
Suman Bhattacharya
Keyword(s):  
Thermal Expansion ◽  
Crystal Packing

Switching from positive to negative axial thermal expansion in two organic crystalline compounds with similar packing

2018 ◽  
Vol 54 (76) ◽  
pp. 10675-10678 ◽  
Author(s):  
Lalita Negi ◽  
Ashutosh Shrivastava ◽  
Dinabandhu Das
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Crystal Packing ◽  
Unusual Phenomenon ◽  
Packing Arrangement ◽  
Thermal Vibrations

Switching from positive to negative axial thermal expansion was observed in two organic crystalline compounds with similar crystal packing. This unusual phenomenon has been explained by the packing arrangement of molecules in the crystal structure and transverse thermal vibrations of atoms.

Thermal expansion and dimensionality of a hydrogen bond network: a case study on dimorphic oxalic acid

CrystEngComm ◽  
2020 ◽  
Vol 22 (45) ◽  
pp. 7896-7902
Author(s):  
Suman Bhattacharya
Keyword(s):  
Hydrogen Bond ◽  
Thermal Expansion ◽  
Oxalic Acid ◽  
Intermolecular Interactions ◽  
Crystal Packing ◽  
Hydrogen Bond Network ◽  
Bond Network

Between 156 K–298 K the  oxalic acid polymorphs, α-C2 and β-C2 exhibit comparable volumetric thermal expansions which are correlated to the respective crystal packing and intermolecular interactions in the two forms.

The low-resolution 3D-structure of porin, a channel-forming protein in E. coliouter membranes

1983 ◽  
Vol 41 ◽  
pp. 440-441
Author(s):  
A. Engel ◽  
D.L. Dorset ◽  
A. Massalski ◽  
J.P. Rosenbusch
Keyword(s):  
Crystal Packing ◽  
3D Structure ◽  
Gram Negative Bacteria ◽  
Protein Ratio ◽  
Crystal Forms ◽  
Large Molecules ◽  
Functional Studies ◽  
Voltage Dependent ◽  
Planar Membranes ◽  
Hexagonal Arrays

Porins represent a group of channel forming proteins that facilitate diffusion of small solutes across the outer membrane of Gram-negative bacteria, while excluding large molecules (>650 Da). Planar membranes reconstituted from purified matrix porin (OmpF protein) trimers and phospholipids have allowed quantitative functional studies of the voltage-dependent channels and revealed concerted activation of triplets. Under the same reconstitution conditions but using high protein concentrations porin aggregated to 2D lattices suitable for electron microscopy and image processing. Depending on the lipid-to- protein ratio three different crystal packing arrangements were observed: a large (a = 93 Å) and a small (a = 79 Å) hexagonal and a rectangular (a = 79 Å b = 139 Å) form with p3 symmetry for the hexagonal arrays. In all crystal forms distinct stain filled triplet indentations could be seen and were found to be morphologically identical within a resolution of (22 Å). It is tempting to correlate stain triplets with triple channels, but the proof of this hypothesis requires an analysis of the structure in 3 dimensions.

Microstructural and Microchemical Characterization of Nickel Sulfide Inclusions in Plate Glass

1991 ◽  
Vol 49 ◽  
pp. 962-963
Author(s):  
J. Cooper ◽  
O. Popoola ◽  
W. M. Kriven
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Glass Matrix ◽  
Nickel Sulfide ◽  
Plate Glass ◽  
Thermal Expansion Mismatch ◽  
Volume Increase ◽  
Β Phase ◽  
Microchemical Characterization

Nickel sulfide inclusions have been implicated in the spontaneous fracture of large windows of tempered plate glass. Two alternative explanations for the fracture-initiating behaviour of these inclusions have been proposed: (1) the volume increase which accompanies the α to β phase transformation in stoichiometric NiS, and (2) the thermal expansion mismatch between the nickel sulfide phases and the glass matrix. The microstructure and microchemistry of the small inclusions (80 to 250 μm spheres), needed to determine the cause of fracture, have not been well characterized hitherto. The aim of this communication is to report a detailed TEM and EDS study of the inclusions.

Thermal Expansion of Martensitic A15 Superconductors: V3Si

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-1109-C8-1113
Author(s):  
T.R. Finlayson, ◽  
M. Liu ◽  
T.F. Smith
Keyword(s):  
Thermal Expansion

STRUCTURAL TRANSFORMATION STUDIED BY THERMAL EXPANSION ON SINGLE CRYSTALS V3Si IN NORMAL AND SUPERCONDUCTING STATES

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-406-C6-407 ◽  
Author(s):  
T. Fukase ◽  
T. Kobayashi ◽  
M. Isino ◽  
N. Toyota ◽  
Y. Muto
Keyword(s):  
Thermal Expansion ◽  
Single Crystals ◽  
Structural Transformation

FREE VOLUME CHANGE OF METALLIC GLASSES STUDIED BY THERMAL EXPANSION MEASUREMENTS

1980 ◽  
Vol 41 (C8) ◽  
pp. C8-875-C8-877
Author(s):  
E. Girt ◽  
P. Tomić ◽  
A. Kuršumović ◽  
T. Mihać-Kosanović
Keyword(s):  
Thermal Expansion ◽  
Free Volume ◽  
Volume Change ◽  
Metallic Glasses

MAGNETIC, THERMAL EXPANSION, AND ELECTRICAL RESISTIVITY STUDIES OF FeAlMnC STEELS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1903-C8-1904
Author(s):  
S. U. Jen ◽  
Y. D. Yao ◽  
H. Y. Pai
Keyword(s):  
Electrical Resistivity ◽  
Thermal Expansion

THERMAL EXPANSION ANOMALIES AT THE MAGNETIC TRANSITION OF Mn3Ga1-xAlxC (x ≤ 0.05)

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-159-C8-160
Author(s):  
T. Suzuki ◽  
T. Kanomata ◽  
T. Kaneko
Keyword(s):  
Thermal Expansion ◽  
Magnetic Transition
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