Primary agglomeration

A seeond and perhaps simplest form of primary agglomerate results from the phenomenon known as parallel growth in whieh individual erystals of the same substanee grow in a staek on top of one another in sueh a manner that all eorresponding faees and edges of the individuals are parallel. The elassie example... 

While primary agglomeration can occur originating from a single crystal, a second form of agglomeration occurs because of the presence and motion of more than one crystal in a suspension, leading to secondary crystal aggregation. Two types of secondary agglomeration occur ... 

Primary agglomerates. These particles are spherical and have a maximum diameter of 450 A. 

The growing together of primary agglomerates to form larger entities. 

If the feed is made up of several components or of only one raw material and recycle, a mixer may be installed in front of the roller press. Selection of this piece of equipment plays an important role in pressure agglomeration. In dry, binderless applications, a high intensity mixer may excessively aerate the material and prohibit successful compaction because the roller press is not capable of sufficiently deaerating the blend. A too severe mixing action may also destroy primary agglomerates in the recycle which are necessary to obtain the required product density. 

Primary agglomerate (s) consisting of only a few particles on which further growth occurs. (See also seed.)... 

The growing together of primary AGGLOMERATES to form larger entities. (See also SATELLITES FORMATION) An aggregate of COLLOIDAL droplets held together by electrostatic attraction forces. 

Nucleation, the production of primary agglomerates or seeds , occurs when several individual particles adhere to each other. Nucleation is the most difficult and time consuming part of any tumble/growth agglomeration process. Since only a small number of nuclei survives at any given time, this initial part of the growth process is time consuming. 

Next to the interfacial properties between the nanotubes and the polymer as well as the mixing conditions, the structure of primary agglomerates can have a significant influence on the state of nanotube dispersion and distribution. As an example, four different kinds of raw MWCNT materials are considered in the following NanocyF NC 7000... 

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