scholarly journals Physicochemical Properties of α-Form Hydrated Crystalline Phase of 3-(10-Carboxydecyl)-1,1,1,3,5,5,5-heptamethyl Trisiloxane/Higher alcohol/Polyoxyethylene (5 mol) Glyceryl monostearate/Water System

2018 ◽  
Vol 67 (7) ◽  
pp. 839-849 ◽  
Author(s):  
Makoto Uyama ◽  
Hidefumi Araki ◽  
Tadao Fukuhara ◽  
Kei Watanabe
Keyword(s):  
Physicochemical Properties ◽  
Crystalline Phase ◽  
Water System ◽  
Glyceryl Monostearate ◽  
Higher Alcohol

scholarly journals Influence of Soya Lecithin, Sorbitan and Glyceryl Monostearate on Physicochemical Properties of Organogels

2020 ◽  
Vol 15 (3) ◽  
pp. 386-395 ◽  
Author(s):  
Sheah Yee Ghan ◽  
Lee Fong Siow ◽  
Chin Ping Tan ◽  
Kok Whye Cheong ◽  
Yin Yin Thoo
Keyword(s):  
Physicochemical Properties ◽  
Glyceryl Monostearate ◽  
Soya Lecithin

Physicochemical properties of the potassium hydroxide-water system. Range: 55 to 85 weight percent and 120.degree. to 250.degree.

1967 ◽  
Vol 12 (4) ◽  
pp. 465-472 ◽  
Author(s):  
Wolfgang M. Vogel ◽  
K. J. Routsis ◽  
Victor J. Kehrer ◽  
Douglas A. Landsman ◽  
Johann G. Tschinkel
Keyword(s):  
Physicochemical Properties ◽  
Potassium Hydroxide ◽  
Water System ◽  
Weight Percent ◽  
Hydroxide Water

Some physicochemical properties of the methylmorpholine-N-oxide-water system

1983 ◽  
Vol 15 (1) ◽  
pp. 30-33 ◽  
Author(s):  
V. A. Platonov ◽  
Yu. Ya. Belousov ◽  
N. S. Pozhalkin ◽  
I. D. Zenkov ◽  
V. G. Kulichikhin
Keyword(s):  
Physicochemical Properties ◽  
Water System

Towards clathrates. 2. The frozen states of hydration of tert-butanol

2018 ◽  
Vol 233 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Lukasz Dobrzycki
Keyword(s):  
Single Crystal ◽  
Crystalline Phase ◽  
Ambient Pressure ◽  
Water System ◽  
Hydroxyl Group ◽  
Molar Ratio ◽  
Water Molecules ◽  
Hydroxyl Groups ◽  
Hydrogen Atoms ◽  
Ir Laser

AbstractA new crystal structure oftert-butanol and water crystallizing as the decahydrate is reported. The crystallization of the mixture in the desired molar ratio was performed in a capillary placed directly on a goniometer of a single crystal diffractometer at 200 K and ambient pressure using focused IR laser radiation. The crystals were grown while the melting zone formed by the IR laser was moved along the capillary. Usually the crystallization process should be long enough (hours) in order to obtain a good quality single crystal. However, in the case oftert-butanol decahydrate, such a long process led to separation of the ice and alcohol. Only fast crystallization taking tens of seconds allowed crystallization of the desired crystalline phase. In the decahydratetert-butanol molecules are located in channels formed by water molecules. Hydroxyl groups are anchored to the water framework via hydrogen bonds. All water molecules in the structure have hydrogen atoms disordered equally over two sites; the hydroxyl group is likewise disordered. This effect is observed at both, 200 K and 100 K. Raman spectra recorded for the crystalline phase suggest dynamic disorder at higher temperature, converting to static at lowerT. The decahydrate oftert-butanol, together with already known itsdi- andhepta-hydrates, display similar features to those observed for series oftert-butylamine hydrates. The latter structures behave as frozen steps of amine hydration observed as crystal structures leading, at maximum dilution, to hexagonal ice. Hydrates oftert-butanol nicely follow this tendency completing the relationship found for thetert-butylamine: water system.

scholarly journals Investigation of the thermodynamic and physicochemical properties of lavender oil (Lavandula angustifolia Mill.)-ethanol-water system

2021 ◽  
Vol 286 ◽  
pp. 02004
Author(s):  
Vanya Gandova ◽  
Stanislava Tasheva ◽  
Vanya Prodanova-Stefanova ◽  
Krasimira Dobreva ◽  
Ivayla Dincheva ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Ternary Phase ◽  
Water System ◽  
Linalyl Acetate ◽  
Lavandula Angustifolia ◽  
Lavender Oil ◽  
Ternary Phase Diagrams ◽  
Sesquiterpene Hydrocarbons ◽  
Thermodynamic And Kinetic Parameters ◽  
Coefficient Of Diffusion

The thermodynamic and physicochemical properties of lavender oil (Lavandula angustifolia Mill.)-ethanol-water system were measured. The chemical composition of solutions of the lavender oil in 70%, 75%, 80%, 85%, 90%, and 95% ethanol was determined using GC/MS analysis. The main compounds in the solutions are oxygenated monoterpenes (β-linalool, terpinen-4-ol, α-terpineol, and linalyl acetate), followed by monoterpene hydrocarbons ((Z)-β-ocimene and (E)-β-ocimene), and sesquiterpene hydrocarbons (β-caryophyllene and (E)-β-farnesene). The ternary phase diagrams were constructed. By multiply linear regression model for surface tension prediction was applied. The thermodynamic and kinetic parameters of lavender oil – ethanol - water system were calculated (energy of Gibb’s, enthalpy, entropy, energy of activation, and coefficient of diffusion).

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