Dispersing agglomerates

Polymer obtained as dispersable agglomerates of micronsized particles. 

Excellent dispersibility Agglomerate-free distribution Maintenance of matrix Tg Good adhesion Low viscosity... 

The tamped volume or apparent density is determined according to Part 11 of ISO 787. The material is passed through a sieve to disperse agglomerates and placed in tarred graduated measuring cylinder. The cylinder is then placed in a tamping volumeter and tamped for 250 revolutions. The volume read from the cylinder is divided by the mass of powder and given as a percent. 

An expression is developed for computing the mean size z, of randomly dispersed agglomerates, from the variance S2, obtained with a certain sample size, R. The author postulates a rate equation for solids mixing, which he feels may also be applicable to the homogenizing process in glass melting. 

There are two different applications for easily dispersible agglomerated products ... 

So far, only basic concepts have been outlined about the surface charge behaviour and its implications concerning interactions between charged surfaces. Most applications demand a control of interaction forces and/or surface behaviour, e.g. dispersion/agglomeration or the wettability of particulate systems. This is achieved by the use of polymer/surfactant or particulate coatings on core particles. The manipulation of surface behaviour and/or interactions by polymeric coatings is discussed next. 

Optical microscopy has been used to analyse the CNT macrodisper-sion and to quantify the presence of non-dispersed agglomerates (average diameter larger than 6 Indeed, by using a method described... 

The change in morphology of electrodeposited copper from very disperse agglomerates of copper grains to branchy dendrites (Fig. 5.12d-f) clearly points out the decrease of effectiveness of solution stirring of evolved hydrogen and the... 

Sometimes pre-processing is necessary, for example melting the solid substances or dissolving active substances or excipients in one of the components, or dispersing agglomerates. 

For dispersion of agglomerates amid another substance usually a (non-rough) pestle and mortar, an three roll mill (ointment miU, see Sect. 28.6.6) or a rotor-stator mixer (see Sect. 28.6.2) are used as a tool. Sometimes a beaker mixer/ blender (Sect. 28.6.5) or the Stephan mixer (Sect. 28.6.1) is used). Trituration of an active substance with eye ointment base is done in a stone mortar with a stone pestle because a lot of force is needed. Sometimes it is possible to disperse agglomerates on an ointment tile with a spatula, but a drawback is that no great force can be exerted. For the dispersion of a sohd substance amid other solids, a plastic or metal mortar can be used. 

To choose the most appropriate method for dispersing agglomerates some basic rules are given ... 

Disperse agglomerates (morphine hydrochloride with lactose)... 

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