Structure of water and aqueous solutions of nonelectrolytes, according to1H NMR data. II. Water-alcohol solutions. Topology of network of hydrogen bonds with low concentrations of alcohols, and bulk properties

1990 ◽  
Vol 31 (3) ◽  
pp. 432-437 ◽  
Author(s):  
I. M. Svishchev ◽  
V. V. Goncharov
Keyword(s):  
Hydrogen Bonds ◽  
Aqueous Solutions ◽  
Bulk Properties ◽  
Structure Of Water ◽  
Nmr Data ◽  
Low Concentrations ◽  
Network Of Hydrogen Bonds ◽  
Water Alcohol Solutions ◽  
Water Alcohol

scholarly journals Dielectric property and micro-structure of water-alcohol solutions.

1996 ◽  
Vol 45 (10) ◽  
pp. 903-908 ◽  
Author(s):  
Takaya TAKEI ◽  
Yoshinori SUGITANI ◽  
Chikara AMANO ◽  
Yuko NISHIMOTO
Keyword(s):  
Dielectric Property ◽  
Micro Structure ◽  
Structure Of Water ◽  
Water Alcohol Solutions ◽  
Water Alcohol

scholarly journals Clusterization and anomalies of fluctuations in water-alcohol solutions of low concentrations

2003 ◽  
Vol 7 (2) ◽  
pp. 175-183 ◽  
Author(s):  
V. Eu. Chechko ◽  
T. V. Lokotosh ◽  
N. P. Malomuzh ◽  
V. G. Zaremba ◽  
V. Ya. Gotsul'sky
Keyword(s):  
Low Concentrations ◽  
Water Alcohol Solutions ◽  
Water Alcohol

scholarly journals IR-Spectroscopy of Aqueous Solutions of Monoethanolamine

2021 ◽  
Vol 13 (2) ◽  
pp. 169-176
Author(s):  
Elena G. Kononova ◽  
◽  
Margarita N. Rodnikova ◽  
Irina A. Solonina ◽  
Ekaterina V. Shirokova ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Hydrogen Bonds ◽  
Aqueous Solutions ◽  
Quantum Chemical ◽  
Water System ◽  
Water Molecules ◽  
Spatial Networks ◽  
Mixed Network ◽  
System Components ◽  
Network Of Hydrogen Bonds

The monoethanolamine (MEA)-water system has been studied by IR spectroscopy and quantum-chemical calculations (DFT B3LYP). It was found that spatial networks both of water and MEA are continuously rearranging depending on the content of the system components. Water molecules are embedded into the net of MEA, and molecules of MEA into the water net, thereby forming a mixed network of hydrogen bonds.

Flow Behaviors of High Acyl Gellan Aqueous Solutions as Affected by Temperature, and Calcium and Gellan Concentrations

2008 ◽  
Vol 4 (5) ◽  
Author(s):  
Yiqun Huang ◽  
Pawan Singh Takhar ◽  
Juming Tang ◽  
Barry G Swanson
Keyword(s):  
Shear Rate ◽  
Aqueous Solutions ◽  
Apparent Viscosity ◽  
Flow Resistance ◽  
Effect Of Temperature ◽  
Temperature Changes ◽  
Influence Of Temperature ◽  
Rheological Behaviors ◽  
Low Concentrations ◽  
Influence Of Temperature On

Rheological behaviors of high acyl (HA) gellan are not well understood partially because of its relatively late commercialization compared to low acyl gellan. The objective of this study was to investigate the effect of temperature (5-30 °C), calcium (0, 1 and 10 mM) and gellan concentrations (0.0044-0.1000% w/v) on the flow behaviors of high acyl gellan aqueous solutions using rheological tests. Gellan solutions with 0 or 1 mM added Ca++ exhibited shear thinning behavior at gellan concentrations above 0.0125%. The influence of temperature on apparent viscosity (shear rate, 100 s-1) of gellan solutions can be described with an Arrhenius relationship. The apparent viscosity of gellan solution at low concentrations was more sensitive to temperature changes. The addition of Ca++ led to a decrease in flow resistance for a dilute gellan solution (<0.0125%), but an increased resistance for a relatively concentrated gellan solution (>0.0125%).

Organocatalytic asymmetric epoxidation reactions in water–alcohol solutions

2005 ◽  
Vol 3 (21) ◽  
pp. 3883 ◽  
Author(s):  
Wei Zhuang ◽  
Mauro Marigo ◽  
Karl Anker Jørgensen
Keyword(s):  
Asymmetric Epoxidation ◽  
Water Alcohol Solutions ◽  
Water Alcohol

scholarly journals Modification of Chitin Particles with Ionic Liquids Containing Ethyl Substituent in a Cation

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Malgorzata M. Jaworska ◽  
Andrzej Górak ◽  
Joanna Zdunek
Keyword(s):  
Particle Size ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
High Viscosity ◽  
Physical Structure ◽  
Ethyl Group ◽  
Network Of Hydrogen Bonds

Chitin cannot be dissolved in conventional solvents due to the strong inter- and intrasheet network of hydrogen bonds and the large number of crystalline regions. Some ionic liquids (ILs) have been suggested in the literature as possible solvents for chitin. Seven of them, all having an ethyl group as substituent in the cationic ring, have been tested in this work: [Emim][Cl], [Emim][Br], [Emim][I], [Emim][OAc], [Emim][Lact], [Epyr][I], and [EMS][BFSI]. Chitin was insoluble in [EMS][BFSI] while for all other ILs solubility was limited due to high viscosity of solutions and equilibria have not been reached. Changes in physical structure, particle size distribution, and crystallinity of recovered chitin depended on ionic liquid used. Increase in porosity was observed for chitin treated with [Emim][Cl], [Emim][I], [Emim][Br], and [Emim][Lact]; changes in particle size distribution were observed for [Emim][AcOH] and [EMS][BFSI]; increase in crystallinity was noticed for chitin treated with [Epyr][I] while decrease in crystallinity for [Emim][I] was noticed. All tested ionic liquids were reused four times and changes in FTIR spectra could be observed for each IL.

Sign in / Sign up

Export Citation Format

Share Document