Properties Of Water Films Research Articles

Investigations of water film properties on barite surface containing preadsorbed tetradecylammonium hydrochloride (TDACl)

Investigations of the properties of water layers on bare barite and on barite samples covered with various amounts of TDACl after flotation are described. A thermal analysis method was used in our investigations. The relations between layer thickness, activation energy, enthalpy and entropy of bonded water and the amount of TDACl previously deposited on the barite surface were determined. On the basis of the results obtained and on the literature data an interpretation of these parameter changes caused by the barite surface coverage with TDACl molecules is proposed. Correlation between these parameters and the changes of water structure and barite flotability is also presented.

Investigation of water film properties on graphite surfaces

Isotherms of water adsorption and desorption from graphite surfaces have been determined. Thermal analysis curves of water thermodesorption from graphite surfaces have also been determined. From the experimental data the energetic changes accompanying water adsorption and desorption processes were calculated. A mechanism for water adsorption has been proposed, and conclusions concerning the structure and other properties of water films on graphite surfaces have been made.

Investigations of the properties of water films on quartz surfaces

Isotherms of water adsorption on and desorption from quartz surfaces have been determined. Thermal analysis curves of water thermodesorption from quartz surfaces have also been determined. From the experimental data, the energetic changes accompanying the water adsorption and desorption processes were calculated. The mechanism of water adsorption has been proposed, and conclusions concerning the structure and other properties of water films on quartz surfaces have been drawn.

New data on the structure and properties of thin water films on mica crystals

The interface properties of water films between fresh active mica crystal surfaces were examined. The unique properties are evident in the peculiar structure of the films, in anomalous thermal expansion, in the electro and thermal conductivity, in the degeneration of the degree of molecule rotation, and in the strong valence bond disturbance of molecules in the surface field. These properties point to the high degree of ordering for water molecules in border films on mica crystal surfaces and indicate the rise of a new interfacial quasi-solid structure. Results illustrate the existence of edge phases for liquids coupled with solids and unusual properties of water.

Dielectric Properties of Water Adsorbed on Silica Gel and Alumina Gel

Observations were made of the dielectric properties of water film adsorbed on silica and alumina gels to investigate the structural conditions of adsorbed water films which may cause non-Newtonian behaviour and thixotropic characteristics in these dispersions.The following results have been obtainedWhen the amount of water in the adsorbed film was increased:(1) Contribution to the dielectric polarization of dissolved and adsorbed ions in the moisture film decreased(2) The relaxation time of interfacial polarization due to the adsorbed ions decreased(3) The width of the distribution of relaxation time became a little narrower. When the compression was applied to the gels:(4) The interfacial polarization due to the adsorbed ions in the adsorbed moisture layer increased.(5) The relaxation time decreased to a small extent(6) Little variation of width has been detected in the distribution of relaxation time.From these results investigated, it can be concluded that the water molecules in the adsorbed water layers have different properties from those of free water molecules. The adsorption forces on the surface of gel powder decrease with the distance from the powder surface. When the electrical field is applied, the adsorbed ions have a tendency to move through the outer layers where the adsorption forces are small.