Water molecules in CNT–Si3N4 membrane: Properties and the separation effect for water–alcohol solution

2021 ◽  
Vol 155 (10) ◽  
pp. 104701
Author(s):  
Winarto ◽  
Eiji Yamamoto ◽  
Kenji Yasuoka
Keyword(s):  
Alcohol Solution ◽  
Membrane Properties ◽  
Water Molecules ◽  
Separation Effect ◽  
Water Alcohol

An approach to prepare uniform graphene oxide/aluminum composite powders by simple electrostatic interaction in water/alcohol solution

2019 ◽  
Vol 13 (4) ◽  
pp. 375-381
Author(s):  
Wei Sun ◽  
Rui Zhao ◽  
Tian Wang ◽  
Ke Zhan ◽  
Zheng Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrostatic Interaction ◽  
Alcohol Solution ◽  
Composite Powders ◽  
Aluminum Composite ◽  
Water Alcohol

scholarly journals Modification of Structure and Magnetic Properties in Coordination Assemblies Based on [Cu(cyclam)]2+ and [W(CN)8]3−

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 45 ◽  
Author(s):  
Aleksandra Pacanowska ◽  
Mateusz Reczyński ◽  
Beata Nowicka
Keyword(s):  
Magnetic Properties ◽  
Coordination Polymer ◽  
Single Crystal ◽  
Structural Transformation ◽  
Water Solution ◽  
Building Blocks ◽  
Alcohol Solution ◽  
Slow Diffusion ◽  
Crystal Structural ◽  
Water Alcohol

The 1D {[CuII(cyclam)]3[WV(CN)8]2.5H2O}n (1·5H2O) (cyclam = 1,4,8,11-tetraazacyclotetradecane) coordination polymer of ladder topology can be obtained in water-alcohol solution from [Cu(cyclam)]2+ and [W(CN)8]3− building blocks. Upon dehydration, 1·5H2O undergoes a single-crystal-to-single-crystal structural transformation to the anhydrous {[CuII(cyclam)]3[WV(CN)8]2}n (1) form, which retains the same topology, but is characterized by shorter Cu-W distances and significantly more bent CN-bridges. The deformation of the coordination skeleton is reflected in magnetic properties: the predominant intra-chain interactions change from ferromagnetic in 1·5H2O to antiferromagnetic in 1. The reaction between the same building blocks in water solution under slow diffusion conditions leads to the formation of a 0D {[CuII(cyclam)(H2O)]2[CuII(cyclam)][WV(CN)8]2}.3H2O pentanuclear assembly (2·3H2O).

Formation of Silica Particles by Dc Voltage

2013 ◽  
Vol 663 ◽  
pp. 312-315
Author(s):  
Li Zhang ◽  
Bing Sun ◽  
Masayuki Sato
Keyword(s):  
High Voltage ◽  
Water Glass ◽  
Silica Particles ◽  
Alcohol Solution ◽  
Nozzle Diameter ◽  
Water Molecules ◽  
Dc Voltage ◽  
Electrode Distance ◽  
Wide Range ◽  
Atomized Water

In the present study, dc high voltage was applied to produce droplets with controlled diameter in wide range. The dc voltage was ranged from 0 to several kV. Water glass was atomized in alcohol solution into diameters of several ten μm, depending on dc voltage applied between nozzle and ground electrode. The atomized water glass droplets were solidified by removing water molecules from the water glass. When the dc voltage was raised, nozzle diameter and electrode distance were decreased, the diameter of silica particles was decreased.

The influence of extended mercerization on some properties of carboxymethyl cellulose (CMC)

Holzforschung ◽  
2012 ◽  
Vol 66 (1) ◽  
Author(s):  
Heléne Almlöf ◽  
Bjørn Kreutz ◽  
Kristina Jardeby ◽  
Ulf Germgård
Keyword(s):  
Retention Time ◽  
Carboxymethyl Cellulose ◽  
Negative Influence ◽  
Positive Influence ◽  
Alcohol Solution ◽  
Cellulose Ii ◽  
Cellulose I ◽  
Lower Reactivity ◽  
Stage Process ◽  
Water Alcohol

Abstract Carboxymethyl cellulose (CMC) is produced commercially in a two stage process consisting of a mercerization stage in which the pulp is treated with alkali in a water alcohol solution and a second etherification stage whereby monochloro-acetic acid is added to the pulp slurry. In this study, the influence of the conditions of an extended mercerization stage was evaluated on the etherification stage concerning the degree of substitution (DS) and the filterability of the resulting CMC. The parameters studied were: (1) the ratio of cellulose I and cellulose II in the original pulp, (2) the concentration of alkali, (3) the temperature and (4) the retention time in the mercerization stage. The DS results indicate that the NaOH concentration in the mercerization stage is the most important among the parameters studied. When the NaOH concentration in the mercerization stage was high (27.5%), cellulose II showed a lower reactivity than cellulose I with respect to the DS obtained in the resulting CMC. The results from the filtration ability of CMC water solutions are interpreted that the amount of cellulose II in the original pulp and the temperature has a negative influence, while the NaOH concentration in the mercerization stage has a positive influence on the filtration ability. Retention time between 1 h–48 h in the mercerization stage had no effect on the DS or the filtration value. The filtration ability was assumed to be highly influenced by the presence of poorly reacted cellulose segments. The CMC samples with the lowest filtration ability at a given DS can be assumed to have the highest degree of unevenly substituted segments.

Solvation of chromium(III) ion in water-alcohol solution

1970 ◽  
Vol 92 (10) ◽  
pp. 3017-3021 ◽  
Author(s):  
Council C. Mills ◽  
Edward L. King
Keyword(s):  
Alcohol Solution ◽  
Water Alcohol

scholarly journals ON THE BEHAVIOR OF PHYSICAL PARAMETERS OF AQUEOUS SOLUTIONS AFFECTED BY THE INERTON FIELD OF TESLAR® TECHNOLOGY

2006 ◽  
Vol 20 (01) ◽  
pp. 111-124 ◽  
Author(s):  
VOLODYMYR KRASNOHOLOVETS ◽  
SERGIY SKLIARENKO ◽  
OLEXANDER STROKACH
Keyword(s):  
Aqueous Solutions ◽  
Physical Parameters ◽  
Water Molecules ◽  
Distilled Water ◽  
Matter Waves ◽  
Liquid Systems ◽  
Phenomenological Consideration ◽  
Additional Interaction ◽  
Polar Water ◽  
Water Alcohol

We present studies of the behavior of the permittivity of such liquid systems as pure distilled water, alcohol and 50%-aqueous solutions of alcohol as affected by the inerton field generated by a special signal generator contained within a wrist-watch or bracelet made by so-called Teslar® technology. It has been found that the changes are in fact significant. The method employed has allowed us to fix the value of frequency of the field generated by the Teslar® chip. The frequency has been determined to be approximately 8 Hz. The phenomenological consideration and submicroscopic foundations of a significant increase of the permittivity are studied, taking into account an additional interaction, namely, the mass interaction between polar water molecules, which is caused by the inerton field of the Teslar® chip. This is one more proof of Krasnoholovets' concept regarding the existence of a substructure of the matter waves of moving/vibrating entities, i.e. the inerton field, which has been predicted in a series of his previous works.

scholarly journals On the Coupling between Mechanical Properties and Electrostatics in Biological Membranes

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 478
Author(s):  
Vanesa Viviana Galassi ◽  
Natalia Wilke
Keyword(s):  
Electric Fields ◽  
Polar Region ◽  
Signal Propagation ◽  
Membrane Properties ◽  
Nanometer Scale ◽  
Water Molecules ◽  
Membrane Thickness ◽  
Polar Regions ◽  
Membrane Electrostatics ◽  
Mechanical Deformations

Cell membrane structure is proposed as a lipid matrix with embedded proteins, and thus, their emerging mechanical and electrostatic properties are commanded by lipid behavior and their interconnection with the included and absorbed proteins, cytoskeleton, extracellular matrix and ionic media. Structures formed by lipids are soft, dynamic and viscoelastic, and their properties depend on the lipid composition and on the general conditions, such as temperature, pH, ionic strength and electrostatic potentials. The dielectric constant of the apolar region of the lipid bilayer contrasts with that of the polar region, which also differs from the aqueous milieu, and these changes happen in the nanometer scale. Besides, an important percentage of the lipids are anionic, and the rest are dipoles or higher multipoles, and the polar regions are highly hydrated, with these water molecules forming an active part of the membrane. Therefore, electric fields (both, internal and external) affects membrane thickness, density, tension and curvature, and conversely, mechanical deformations modify membrane electrostatics. As a consequence, interfacial electrostatics appears as a highly important parameter, affecting the membrane properties in general and mechanical features in particular. In this review we focus on the electromechanical behavior of lipid and cell membranes, the physicochemical origin and the biological implications, with emphasis in signal propagation in nerve cells.

scholarly journals RESEARCH OF MINERAL ADSORBENTS APPLICATION FOR WATER-ALCOHOL SOLUTIONS PURIFICATION IN TECHNOLOGY OF ALCOHOLIC BEVERAGES

2017 ◽  
Vol 4 ◽  
pp. 3-10
Author(s):  
Lolita Marynchenko ◽  
Viktor Marynchenko ◽  
Mariana Hyvel
Keyword(s):  
Ethyl Acetate ◽  
Alcohol Solution ◽  
Economic Feasibility ◽  
Alcoholic Beverages ◽  
Active Coal ◽  
Rectification Factor ◽  
Mineral Adsorbents ◽  
Water Alcohol Solutions ◽  
Water Alcohol ◽  
Purification Of Water

The possibility of using natural mineral adsorbents - clinoptilolite and schungite - in the adsorption purification of water-alcohol solutions of different concentrations was studied using the example of impurities of ethanol of acetaldehyde and ethyl acetate. The feasibility of studying the above-mentioned minerals for the adsorption of simple organic substances is justified. The best concentration of a water-alcohol solution for adsorption of acetaldehyde 80-85 vol.%, ethyl acetate-40 vol.% is experimentally established. The rational duration of phase contact for adsorption of acetaldehyde is from 10 to 20 minutes, for adsorption of ethyl acetate - 5 minutes. An explanation for the dependence of the sorption efficiency on the ethanol content in a water-alcohol solution is proposed based on the known dependencies of the rectification factor on the ethanol concentration. The larger the rectification factor, the less the hydrogen bond of this impurity with ethanol and the easier it is to sorb it from ethanol by mineral adsorbents. The practical and economic feasibility of using the mineral adsorbent clinoptilolite of Ukrainian origin in the preparation of alcoholic beverages instead of imported active coal is shown. It is determined that to purify water-alcohol solutions from aldehydes, which most worsen the taste of alcoholic beverages, it is more expedient to use clinoptilolite as an adsorbent. It is shown that the use of clinoptilolite for the preparation of vodkas from non-standard rectified alcohol will improve the tasting indicators of the final product.

scholarly journals Water/Alcohol Separation in Graphene Oxide Membranes: Insights from Molecular Dynamics and Monte Carlo Simulations

MRS Advances ◽  
2018 ◽  
Vol 3 (1-2) ◽  
pp. 109-114 ◽  
Author(s):  
Daiane Damasceno Borges ◽  
Cristiano F. Woellner ◽  
Pedro A. S. Autreto ◽  
Douglas S. Galvao
Keyword(s):  
Molecular Dynamics ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Water Molecules ◽  
Pristine Graphene ◽  
Strong Impact ◽  
Water Permeation ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes ◽  
Water Alcohol

ABSTRACTGraphene-based membranes have been investigated as promising candidates for water filtration and gas separation applications. Experimental evidences have shown that graphene oxide can be impermeable to liquids, vapors and gases, while allowing a fast permeation of water molecules. This phenomenon has been attributed to the formation of a network of nano capillaries that allow nearly frictionless water flow while blocking other molecules by steric hindrance effects. It is supposed that water molecules are transported through the percolated two-dimensional channels formed between graphene-based sheets. Although these channels allow fast water permeation in such materials, the flow rates are strongly dependent on how the membranes are fabricated. Also, some fundamental issues regarding the nanoscale mechanisms of water permeation are still not fully understood and their interpretation remains controversial. In this work, we have investigated the dynamics of water permeation through pristine graphene and graphene oxide model membranes that have strong impact on water/alcohol separation. We have carried out fully atomistic classical molecular dynamics simulations of systems composed of multiple layered graphene-based sheets into contact with a pure water reservoir under controlled thermodynamics conditions (e. g., by varying temperature and pressure values). We have systematically analysed how the transport dynamics of the confined nanofluids depend on the interlayer distances and the role of the oxide functional groups. Our results show the water flux is much more effective for graphene than for graphene oxide membranes. These results can be attributed to the H-bonds formation between oxide functional groups and water, which traps the water molecules and precludes ultrafast water transport through the nanochannels.

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