Teilchengrößen-Bestimmung mittels dynamischer Lichtstreuung

Particle-sizing by dynamic light scattering . The range of applications of colloidal systems is often defined merely by their particle-size distribution. Dynamic light scattering has proven to be a fast and precise technique for sizing particles in the range of 3 nm to 3 μm. This paper describes the basis of measurement and the method of data analysis. Numerous applications of dynamic light scattering in the chemical industry are also given.     

Partikelgröße und Permeation

Particle Size and Permeation Using the Tesafilm (adhesive tape)-tear off method and by microscopie evaluation of the resulting films in polarized light the penetration of crystalline particles in the horny skin can be followed. As seen with examples, such as Tolnaftat, Na₂CO₃ · 10 H₂O and KF 224, crystalline particles can permeate upto remarkable depths in the horny skin. These studies indicate that the particle size of the crystals are only of minor significance. Possibly the depth of penetration depends more upon the crystalline form and on the solubility of substances in the components of the horny layer. Such processes can be determining factors for the intensity and duration of action of dermatological agents.