By Tharwat Tadros
An authoritative and finished reference proper to all scientists and engineers within the box. This encyclopedia not just is helping chemistry, fabrics technological know-how and physics researchers to appreciate the foundations, but in addition presents working towards engineers with the required details for imposing useful purposes, such as
- Food and agrochemicals
- Polymers and ceramics
- Cosmetics and detergents
- Paints and coatings
- Pharmaceuticals and drug delivery
In addition, the encyclopedia is a vital reference for business chemists and chemical engineers confronted with a large number of commercial platforms of a colloidal nature.
As vast because the variety of purposes that colloid and interface technological know-how has is the diversity of medical disciplines that give a contribution to analyze and improvement during this box. those surround chemistry, physics, biology and arithmetic in addition to nanoscience and nanotechnology. The encyclopedia offers easy-to-digest details for assembly those interdisciplinary challenges.
While delivering various concise definitions of keywords, the encyclopedia additionally positive aspects greater than 40 in-depth essays on subject matters starting from Agrochemical Formulations to Zeta strength. All entries are cross-referenced and contain chosen references to unique literature in addition to synonyms.
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Additional resources for Encyclopedia of Colloid and Interface Science
Aggregation of particles and droplets (referred to as heteroflocculation) must be prevented, otherwise the formulation loses its physical stability on storage. The stability/instability of any agrochemical dispersion is determined by the balance of three main forces: (1) van der Waals attraction that is universal for all disperse systems, and it results mainly from the London dispersion forces between the particles or droplets. (2) Double layer repulsion that arises when using ionic surfactants or polyelectrolytes.
In most cases, there is a correlation between the critical flocculation point and the y condition of the medium. Good correlation is found in many cases between the critical flocculation temperature (CFT) and y-temperature of the polymer in solution (with block and graft copolymers one should consider the y-temperature of the stabilizing chains A) (Tadros et al. 1981; Napper 1981). Good correlation is also found between the critical volume fraction (CFV) of a non-solvent for the polymer chains and their y-point under these conditions.
It should be mentioned at this stage that for such a polymer to adsorb, the reduction in entropy of the chain as it approaches the interface must be compensated by an energy of adsorption between the segments and the surface. In other words, the chain segments must have a minimum adsorption energy, ws, otherwise no adsorption occurs. With polymers that are highly A A 26 water soluble, such as poly(ethylene oxide) (PEO), the interaction energy with the surface may be too small for adsorption to occur, and if this takes place, the whole molecule may not be strongly adsorbed to the surface.