Physical properties of parabens and their mixtures: Solubility in water, thermal behavior, and crystal structures

1999 ◽  
Vol 88 (11) ◽  
pp. 1210-1216 ◽  
Author(s):  
Ferdinando Giordano ◽  
Ruggero Bettini ◽  
Cristina Donini ◽  
Andrea Gazzaniga ◽  
Mino R. Caira ◽  
...  
Keyword(s):  
Physical Properties ◽  
Thermal Behavior ◽  
Crystal Structures ◽  
Solubility In Water

scholarly journals Extraordinary thermal behavior of graphene oxide in air for electrode applications

2021 ◽  
Author(s):  
Joong Tark Han ◽  
Joon Young Cho ◽  
Jeong Hoon Kim
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Physical Properties ◽  
Thermal Behavior ◽  
Stability Of Solution ◽  
Exfoliated Graphene ◽  
Potential Applications ◽  
Thermal Stability Of

The thermal stability of solution-exfoliated graphene oxide (GO) in air is one of the most important physical properties influencing its potential applications. To date, majority of the GO prepared by...

scholarly journals Crystal-to-Crystal Transformation from K2[Co(C2O4)2(H2O)2]·4H2O to K2[Co(μ-C2O4)(C2O4)]

2021 ◽  
Vol 7 (6) ◽  
pp. 77
Author(s):  
Bin Zhang ◽  
Yan Zhang ◽  
Guangcai Chang ◽  
Zheming Wang ◽  
Daoben Zhu
Keyword(s):  
Hydrogen Bond ◽  
Physical Properties ◽  
Crystal Structures ◽  
Molecular Crystal ◽  
Trigonal Prism ◽  
Space Group ◽  
Cell Parameters ◽  
Oxalate Anion ◽  
Crystal Transformation ◽  
Antiferromagnetic Ordering

Crystal-to-crystal transformation is a path to obtain crystals with different crystal structures and physical properties. K2[Co(C2O4)2(H2O)2]·4H2O (1) is obtained from K2C2O4·2H2O, CoCl2·6H2O in H2O with a yield of 60%. It is crystallized in the triclinic with space group P1 and cell parameters: a = 7.684(1) Å, b = 9.011(1) Å, c = 10.874(1) Å, α = 72.151(2)°, β = 70.278(2)°, γ = 80.430(2)°, V = 670.0(1) Å3, Z = 2 at 100 K. 1 is composed of K+, mononuclear anion [Co(C2O4)2(H2O)22−] and H2O. Co2+ is coordinated by two bidentated oxalate anion and two H2O in an octahedron environment. There is a hydrogen bond between mononuclear anion [Co(C2O4)2(H2O)22−] and H2O. K2[Co(μ-C2O4)(C2O4)] (2) is obtained from 1 by dehydration. The cell parameters of 2 are a = 8.460(5) Å, b = 6.906 (4) Å, c = 14.657(8) Å, β = 93.11(1)°, V = 855.0(8) Å3 at 100 K, with space group in P2/c. It is composed of K+ and zigzag [Co(μ-C2O4)(C2O42−]n chain. Co2+ is coordinated by two bisbendentate oxalate and one bidentated oxalate anion in trigonal-prism. 1 is an antiferromagnetic molecular crystal. The antiferromagnetic ordering at 8.2 K is observed in 2.

Crystal structures and thermal behavior of complexes of group 13 metal halides with pyridine-type ligands

2015 ◽  
Vol 64 (11) ◽  
pp. 2523-2535 ◽  
Author(s):  
T. N. Sevastianova ◽  
E. I. Davydova ◽  
I. V. Kazakov ◽  
A. Yu. Timoshkin
Keyword(s):  
Thermal Behavior ◽  
Crystal Structures ◽  
Metal Halides ◽  
Group 13

scholarly journals PHYSICAL PROPERTIES AND CRYSTAL STRUCTURES OF POLY (META, PARA-XYLYLENE ADIPAMIDE) COPOLYMER

1973 ◽  
Vol 29 (9) ◽  
pp. T392-T404
Author(s):  
Youichi Kawaguchi ◽  
Masayoshi Shimada ◽  
Fumihide Fujimoto
Keyword(s):  
Physical Properties ◽  
Crystal Structures

scholarly journals Solvent Concentration Effect on Powder X-Ray Diffraction and Dissolution Profiles of Acyclovir-Nicotinamide Cocrystals

2017 ◽  
Vol 7 (04) ◽  
Author(s):  
Setyawan D. ◽  
Siswandono Siswandono ◽  
Winantari A. N. ◽  
Zu’aimah K.
Keyword(s):  
Physical Properties ◽  
Oral Bioavailability ◽  
Ethanol Concentration ◽  
Antiviral Agent ◽  
X Ray Diffraction ◽  
Solvent Concentration ◽  
Solubility In Water ◽  
X Ray ◽  
Dissolution Properties ◽  
Slurry Method

Objective : Acyclovir (ACV) is well-known antiviral agent that has absorption problem, mainly due to its poor solubility in water and oral bioavailability. To improve acyclovir physical properties, especially dissolution properties, acyclovirnicotinamide(NCT) cocrystal was formed. Methods : ACV-NCT cocrystal was prepared using slurry method using ethanol as solvent with different concentration. The ACV-NCT cocrystal from each sample groups was characterized using powder X-ray diffraction (PXRD), and then dissolution properties evaluated. Results : Each ACV-NCT cocrystals prepared from slurry method with different ethanol concentrations have different PXRD profile. Dissolution analysis (ED15) showed that ACV-NCT cocrystallization using slurry methods with 10,0 ml/g as ethanol concentration significantly increase ED15 values compared to acyclovir and acyclovir-nicotinamide physical mixture (α=0,05). Conclusion : ACV-NCT cocrystal successfully formed using slurry method with 10,0 ml/g as optimal ethanol concentration.

Syntheses, crystal structures and physical properties of three new chalcogenides: NaGaGe3Se8, K3Ga3Ge7S20, and K3Ga3Ge7Se20

2016 ◽  
Vol 45 (2) ◽  
pp. 532-538 ◽  
Author(s):  
Xiaoshuang Li ◽  
Chao Li ◽  
Pifu Gong ◽  
Zheshuai Lin ◽  
Jiyong Yao ◽  
...  
Keyword(s):  
Physical Properties ◽  
Crystal Structures ◽  
Layered Structure

NaGaGe3Se8 has a layered structure, while K3Ga3Ge7Q20 (Q = S, Se) are constructed by incompletely isolated quasi-2D layers, leading to large channels loosely occupied by K+ cations.

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