Solid Phase Behavior, Polymorphism, and Crystal Structure Features of Chiral Drug Metaxalone

2018 ◽  
Vol 18 (11) ◽  
pp. 6627-6639 ◽  
Author(s):  
Alexander A. Bredikhin ◽  
Dmitry V. Zakharychev ◽  
Aidar T. Gubaidullin ◽  
Zemfira A. Bredikhina
Keyword(s):  
Crystal Structure ◽  
Phase Behavior ◽  
Solid Phase ◽  
Chiral Drug

scholarly journals Unveiling the Uniqueness of Crystal Structure and Crystalline Phase Behavior of Anhydrous Octyl β-D-Glucoside Using Aligned Assembly on a Surface

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 671 ◽  
Author(s):  
Shigesaburo Ogawa ◽  
Isao Takahashi
Keyword(s):  
Crystal Structure ◽  
Phase Behavior ◽  
Crystalline Phase ◽  
Intermediate Phase ◽  
Solid Phase ◽  
Grazing Incidence ◽  
Single Component ◽  
Pure Substance ◽  
Crystalline Films ◽  
Ripple Phase

Although the anomalous low crystallinity of octyl β-D-glucoside (β-OGlu) was first proposed more than 30 years ago, many fundamental aspects of its crystal structure and of the crystalline phase behavior of the pure substance have remained uncertain. In this paper, we employ grazing-incidence wide-angle X-ray-diffraction measurements using a two-dimensional detector (2D-GI-WAXD) and perpendicularly aligned crystalline films to demonstrate that β-OGlu forms crystal structures consisting of an intermediate phase—like a ripple phase with two large crystal-lattice constants, a and c, comparable to the lengths of its bilayer structures. Furthermore, solid-to-solid phase transitions accompanied by latent heat confirm the existence of a solid-solution-like phase consisting of a crystalline and a liquid-crystal (LC) phase, which persists over a 20 °C temperature range, in a single-component system. In addition, the system forms a superlattice, accompanied by a change in packing of the component sugars in the partial-melting state; this shift is different from the gel-crystal transition observed for a typical lipid system. These facts indicate that even in the crystalline phase formed from a single component, each individual β-OGlu molecule in a single-component phase plays a versatile role in the crystallisation and melting processes. These findings must somewhat explain the specific co-assembling features with proteins of β-OGlu, which has long been used empirically in biochemistry.

Study on the Properties of Doped La in BaBi4Ti4O15 Ceramic

2007 ◽  
Vol 26-28 ◽  
pp. 243-246
Author(s):  
Xing Hua Yang ◽  
Jin Liang Huang ◽  
Xiao Wang ◽  
Chun Wei Cui
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Sintering Temperature ◽  
Solid Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lanthanum Content ◽  
Scanning Electron

BaBi4-xLaxTi4O15 (BBLT) ceramics were prepared by conventional solid phase sintering ceramics processing technology. The crystal structure and the microstructure were detected by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD analyses show that La3+ ions doping did not change the crystal structure of BBT ceramics. The sintering temperature increased from 1120°C to 1150°C with increasing Lanthanum content from 0 to 0.5, but it widened the sintering temperature range from 20°C to 50°C and refined the grain size of the BBT ceramic. Additionally, polarization treatment was performed and finally piezoelectric property was measured. As a result, the piezoelectric constant d33 of the 0.1at.% doped BBLT ceramics reached its highest value about 22pc/N at polarizing electric field of 8kV/mm and polarizing temperature of 120°C for 30min.

Effect of Sintering Temperatures and Ba/Ti Ratio on Dielectric Properties of BaTiO3 Ceramic

2013 ◽  
Vol 750-752 ◽  
pp. 506-511
Author(s):  
Yuan Yuan Li ◽  
Gui Xia Dong ◽  
Bi Yan Zhu ◽  
Qiu Xiang Liu ◽  
Di Wu
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Curie Temperature ◽  
Sintering Temperature ◽  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Method Effect

As a research object, the samples with various Ba/Ti ratios (Ba/Ti=0.95~1.05) were synthesized by solid phase reaction method. Effect of sintering temperatures and Ba/Ti ratio on dielectric properties and crystal structure of BaTiO3ceramic were investigated. Crystal structure and crystal phase composition were investigated by scanning electron microscopy and X-ray diffraction. The dielectric properties were studied by Agilent 4294A at 1 kHz. The results show that the BaTiO3ceramic has high permittivity and dielectric loss at 1340°C. The permittivity of BaTiO3ceramic with Ba/Ti=0.95 change small as the sintering temperatures vary at 1320°C. With the increasing of Ba/Ti ratio, the Curie temperature first increases and then decreases as the sample sintering at 1320°C. When Ba/Ti=1, the Curie temperature increase with the sintering temperature increasing.

Intricate Phase Behavior and Crystal Structure Features of Chiralpara-Methoxyphenyl Glycerol Ether Forming Continuous and Partial Solid Solutions

2016 ◽  
Vol 17 (1) ◽  
pp. 271-283 ◽  
Author(s):  
Robert R. Fayzullin ◽  
Dmitry V. Zakharychev ◽  
Aidar T. Gubaidullin ◽  
Olga A. Antonovich ◽  
Dmitry B. Krivolapov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Behavior ◽  
Solid Solutions ◽  
Glycerol Ether

ChemInform Abstract: A DEUTERON NMR STUDY OF THE SOLID-PHASE BEHAVIOR OF NONADECANE

1983 ◽  
Vol 14 (31) ◽  
Author(s):  
M. G. TAYLOR ◽  
E. C. KELUSKY ◽  
I. C. P. SMITH ◽  
H. L. CASAL ◽  
D. G. CAMERON
Keyword(s):  
Phase Behavior ◽  
Solid Phase ◽  
Nmr Study ◽  
Deuteron Nmr

Crystal structure, solid-solid phase transition and thermal properties of [Mn(H2O)2](ReO4)2

2017 ◽  
Vol 70 (7) ◽  
pp. 1190-1206 ◽  
Author(s):  
Joanna Hetmańczyk ◽  
Łukasz Hetmańczyk ◽  
Anna Migdał-Mikuli ◽  
Edward Mikuli
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Thermal Properties ◽  
Solid Phase ◽  
Solid Phase Transition

Mechanism of Alcohol Displacement of Oil from Porous Media

1961 ◽  
Vol 1 (03) ◽  
pp. 195-212 ◽  
Author(s):  
J.J. Taber ◽  
I.S.K. Kamath ◽  
Ronald L. Reed
Keyword(s):  
Phase Behavior ◽  
Calcium Chloride ◽  
Solid Phase ◽  
Equilibrium Phase ◽  
Water System ◽  
Commercial Application ◽  
Practical Result ◽  
Immiscible Mixture ◽  
Two Phases ◽  
Tie Line

Abstract Alcohol floods of consolidated sandstone cores have shown the process to be strongly dependent on the phase behavior of the particular alcohol-oil-water system used. This means that in many cases the mechanism does not conform to the idea of a piston-like displacement. Instead, it is found that by changing the alcohol it is possible to change the relative velocities of the oil and water and, in fact, the entire mechanism of the process. The effects of rate, viscosity, initial saturation, distance travelled and hysteresis of relative permeability on the alcohol flooding mechanism are discussed. Introduction Reasons for interest in the use of alcohol to miscibly displace oil and water from a porous medium appear in the existing literature. The mechanism of the displacement has been considered and the apparent implications formulated into a theory which presumably would enable one to predict the essential features of the process. Unfortunately, most of the reported experiments have been performed with unconsolidated or artificially consolidated sands. With these systems some of the noteworthy facets of the process are obscured and resulting data appear uncertain. It is the purpose of this paper to show how the use of consolidated sandstones has led to revision of the mechanism and, hence, the theory of alcohol flooding. The practical result is increased pessimism toward the possibilities of commercial application of the simplest form of the alcohol-slug process. However elucidation of the mechanism has made it possible to define the essential characteristics of a system of slugs which will behave in a nearly piston-like fashion and, thus, yield the best possible result. Equilibrium Phase Behavior Fig. 1 is a diagram of the ternary system isopropyl alcohol (IPA)-Soltrol-calcium chloride brine. Brine was used to prevent plugging of the core and calcium chloride was used because sodium chloride brine exhibits a solid phase with Soltrol and IPA. If alcohol is added in increments to the immiscible mixture of water and oil represented by Point A, the path followed by the successively equilibrated samples will be on the Line ABC and pass from the immiscible region to the miscible region by crossing the binodal curve at B. Consider the intersection D of this path with the tie Line EF. The quantity of oleic phase is proportional to the Segment ED and the quantity of the aqueous phase is proportional to DF. Compositions of the two phases are specified by Points E and F. It is clear that in the case shown the oleic phase is diminishing and entirely disappears when miscibility is achieved.

CF4: Crystal Structure and Solid Phase Diagram with Ar

1969 ◽  
Vol 51 (10) ◽  
pp. 4583-4586 ◽  
Author(s):  
Sandra C. Greer ◽  
Lothar Meyer
Keyword(s):  
Crystal Structure ◽  
Phase Diagram ◽  
Solid Phase
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