Supermolecular aggregates

The shape of the presented curve seems to be significant because an increase of the AR values is known (6,11) to indicate the enlargement of the supermolecular aggregation within the membrane casting dope. 

The existence of aggregates is evidenced by virial coefficients wh ch are lower than the theoretical values, for the measured M,. This is because the second virial coefficient decreases with increasing molecular weight. Supermolecular aggregates appear to have very high effective molecular weights. 

Colloid chemistry investigates substance mixtures. These substance mixtures can be heterogenous, such as emulsions (in which tiny droplets of one liquid are dispersed in another), suspensions (consisting of a fine dispersion of solid particles in a liquid volume phase), and aerosols (in which liquid droplets are dispersed in the gas phase). However, there are also homogenous mixtures in which the solute is present in larger, supermolecular aggregates. These homogenous mixtures include micellar solutions and liquid crystalline... 

Another study employing the MPE model (at the SCF computational level) is the calculation of spin-spin coupling constants in methyllithium and lithium dimethylamide [82], In this case, modelling of the solvent as supermolecular aggregates leads to far better agreement with experimentally measured liquid-state spin-spin coupling constants than... 

In the latest years there has been a constant increase of the number of simulation studies concerning large molecules or even supermolecular aggregates, e.g. polymers, proteins or fragments of proteins, enzymes, membrane constituents, stimulated by the development of material science and biotechnology. 

The foregoing discussion illustrates the considerable difficulties attending the representation of supermolecular aggregates whose composition varies with time even more severe are the problems of calculating their properties. 

The difference between direct ordering of molecules and the indirect ordering of molecules via supermolecular aggregates is one of the distinctions between different types of soft material. Thermotropic liquid crystal phases result from partial orientational and translational order of the molecules. In contrast, the symmetry of lamellar, micellar and bicontinuous phases is specified by the location of supermolecular aggregates. The molecules within the aggregate do not have the same orientational and translational order as the mesoscopic structure itself in fact, they can be relatively disordered . 

One of the key components in the enhancement of the performance of a gas separation membrane is the addition of a non-solvent additive. It improves the overall morphology and performance of the membrane. Previous studies have shown that an interaction develops between the nonsolvent additive and polymer resulting in the swelling of the polymer or the formation of supermolecular aggregates. ... 

---