In this paper, association behaviour and ordered structure formation in mixtures of selected vynil based anionic polyelectrolytes and cationic surfactants is reviewed. It is demonstrated by several examples that chain characteristics like linear charge density, backbone rigidity and stereoregular structure of the polymer chain (i.e. tacticity), and eventual presence of hydrophobic side groups on the chain, play a decisive role in the strength of interaction and in crystaline-like structure formation.
COBISS.SI-ID: 34100741
We use the AMSA theory to study the properties of alkali halides in water. We model water molecules as hard spheres with four off-center sites and ions as charged hard spheres with sticky sites that bind to water molecules or other ions. The choice of model parameters is based on two premises: (i) the strength of the interaction between an ion and a water molecule, is inversely proportional to the ionic (crystal) diameter. (ii) The number of contacts an ion can make is proportional to the surface area of the ion. The calculated osmotic coefficients follow experimental trends very well.
COBISS.SI-ID: 34118149
A novel method for calculating the X-ray scattering from model systems was developed by complementing the missing surroundings of each particle with an average image of the system. The method succeeds in combining several favorable properties: An arbitrary scale of wave vector q, excellent suppression of truncation artifacts and good behavior down to the theoretical lower limit of the q-scale. This represents a significant improvement over other methods which either sacrifice one of the above properties or require an intermediate step in which a part of the available information is lost.
COBISS.SI-ID: 34580741
We develop a statistical mechanical model of waterlike fluids. Each water molecule is a disk with three hydrogen-bonding arms. The water interacts with neighboring waters through a van der Waals interaction and hydrogen-bonding interaction. We find that the volumetric and thermal properties follow the experimental trends with temperature in good general agreement with Monte Carlo simulations.
COBISS.SI-ID: 34425605
Molar conductivities, ?, of dilute aqueous solutions (c = (?3•10-4 to ?5•10-3) mol•dm-3) of sodium formate, potassium formate, and formic acid in the temperature range T = (278.15 to 313.15) K are reported. The experimental data are examined by applying the Quint-Viallard conductivity equations and the Debye-Hückel equations for activity coefficients. Limiting conductivities of formate anion in the investigated temperature range were obtained from the data for salts, and then the dissociation constants for formic acid were estimated. Results were compared with the available literature data.
COBISS.SI-ID: 33672709