By Georgios M. Kontogeorgis, Soren Kiil
Colloid and floor Chemistry is a topic of giant value and implications either to our lifestyle and diverse business sectors, starting from coatings and fabrics to medication and biotechnology.
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Extra info for Introduction to applied colloid and surface chemistry
In surface science, we see the intermolecular forces in the discussion of surface and interfacial forces that are directly connected to forces between molecules. Actually, as we will see in Chapter 3, the “surface component” theories of interfacial tension take into account exactly this connection to some of the most important forces, the dispersion, polar and hydrogen bonding ones. g. insects walking on water and spherical droplets) is due to the extensive hydrogen bonds of water and to the associated hydrophobic phenomenon.
E. 2. The vdW forces for particles are computed by summing the attractions between all interparticle pairs. 3. It can be seen that the van der Waals forces are important in all cases and they cannot be ignored, not even for highly polar and hydrogen bonding molecules. For example, the dispersion contribution of water is 15% of the total van der Waals forces at 0 C and 24% at 298 K. The dispersion forces account for over 80% for water–methane and 60% for ammonia–ammonia interactions. 4c). This illustrates the importance and additivity of dispersion forces.
5 hydrogen bonds/molecules, and this increases to about four hydrogen bonds per molecule in water–alkane systems. 1. It is more this loss of entropy rather than enthalpy changes that leads to the unfavourable positive Gibbs energy change associated with the non-mixing of hydrocarbons and other similar molecules in water. Related to the hydrophobic effect is also the so-called hydrophobic interaction, a term describing the strong attraction between non-polar (hydrophobic) molecules and surfaces in water.
Introduction to applied colloid and surface chemistry by Georgios M. Kontogeorgis, Soren Kiil