Emulsion microemulsions

Microemulsions are treated in a separate section in this chapter. Unlike macro- or ordinary emulsions, microemulsions are generally thermodynamically stable. They constitute a distinctive type of phase, of structure unlike ordinary homogeneous bulk phases, and their study has been a source of fascination. Finally, aerosols are discussed briefly in this chapter, although the topic has major differences from those of emulsions and foams. 

High Water-Base Fluids. These water-base fluids have very high fire resistance because as Httle as 5% of the fluid is combustible. Water alone, however, lacks several important quaUties as a hydrauHc fluid. The viscosity is so low that it has Httle value as a sealing fluid water has Httle or no abiHty to prevent wear or reduce friction under boundary-lubrication conditions and water cannot prevent mst. These shortcomings can be alleviated in part by use of suitable additives. Several types of high water-based fluids commercially available are soluble oils, ie, od-in-water emulsions microemulsions tme water solutions, called synthetics and thickened microemulsions. These last have viscosity and performance characteristics similar to other types of hydrauHc fluids. 

Lipid systems such as oils/emulsions/microemulsions/self-emulsifying systems in capsules... 

Other claimed matter DBT for enrichment, biocatalyst preparation contacting process Enzymes contacting process Pure compounds as feedstock Membrane fragments and extracts Cell-free extract (envelope and its fragments + associated enzyme) reversible emulsion microemulsion reverse micelles Cell-free enzyme preparation microemulsified process RR and derivatives and other biocatalyst concepts + any known microorganism active for C—S bond cleavage... 

In the current literature one finds that the knowledge of interfacial tension, Yij> liquid -liquidj is of much importance in many different systems, emulsions, microemulsions, ehnanced oil... 

Various excipients have been used as solubilizers for BCS class II and class IV drugs. Cyclodextrins provide a prime example of the use of excipients as solubilizers, and have been discussed in detail in a separate chapter. Various surfactants have also been used to create emulsion-/microemulsion-type formulations. These have been discussed in a separate chapter as well. 

Emulsions, Microemulsions, and Lipid-Based Drug Delivery Systems... 

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