De-agglomeration

Full dissolution has been reported to proceed in ionic liquids such as butyl- or allyl-methyl-imidazolium chloride under microwave irradiation [59, 60], The Clanton is claimed to be essential to favor the de-agglomerization of the cellulose by breaking its H-bonds that hold it together [61]. The cellulose can subsequently be precipitated from the ionic liquid upon addition of, for example, water, without significant depolymerization. 

The Micromeretics model 1001 [38] works on the following principle. A de-agglomerated stream of particles is sucked from a dispersion device into the center of a rotor where it divides into two streams. Air of either... 

The effect, on dispersion and de-agglomeration in water, of electrostatic repulsion force arising from the surface potential and the double layer 1/x around particles has been investigate. Several suspensions of polystyrene latex in an agglomerated state were prepared where j/ and 1 x were controlled by the pH and electrolyte concentration respectively. These were accelerated in a convergent nozzle to give an external force and the resulting dispersions were examined by optical microscopy. It was found that the dispersion was enhanced with an increase in y/and 1/x. 

Horiba Powder Jet Dry Feeder can be teamed up with the LA-910 or LA 920 to disperse and de-agglomerate powders by subjecting them to a... 

It is commonly recognized that a comprehensive understanding of the properties of a new material is an essential prerequisite to finding its new applications. In this respect, the study of ultrafine diamond is incomplete and its properties remain to be fully elucidated. For example, the nature of the surface functional groups and the method of their modification the nature of the agglomeration of ultrafine crystallites and effective methods of de-agglomeration to prepare mono-dispersed suspension the crystalline and surface structures of the nano-scaled diamond, etc., are appropriate subjects of research An efficient method for the determination of particle size distributions and structures of nano-sized particles in suspension is very important, and is worth developing in the near future. 

Figure 1.14 Schematic representation of formation of new surface (represented by yeUow outer glow) and increase in surface-to-volume ratio upon size reduction/ de-agglomeration of large filler particles/domains (micron size or larger) to form filler NPs.

The lowest cost colorants are dry pigments, whieh require de-agglomeration, dispersion, and mixing into the formulation. Non-dusting versions are available. If a colorant supplier is required to prepare a dispersion in PVC from the pigments and then supply those to the formulator or fabricator, the cost increases. The ehoice will depend upon the complexity of the color palette that a specifie manufacturer requires, his specific equipment... 

Y.L. Hsin, H.-Y. Chu, Y.-R. Jeng, Y.-H. Huang, M.H. Wang, and C.K. Chang, In situ de-agglomeration and surface functionahzation of detonation nanodiamond, with the polymer used as an additive in lubricant oil. Journal of Materials Chemistry, 21 (35), 13213-13222,2011. 

The curing and dynamic properties of precipitated nano-silica on NR without and with the sulfur addition (NR with S), synthetic polyisoprene (IR), polybutadiene (BR) and SBR was investigated. Silica was treated with bis(3-triethoxysilylpropyl)tetrasulfane (TESPT) to form bonds at interfaces. Cure, Mooney viscosity, glass transition temperature, bound rubber, crosslink density and DMA were measured. The properties of silica-filled SBR and BR correlated with highest rolling resistance and SBR-silica correlated with best skid resistance. A Payne effect was observed in the loss modulus under some experimental conditions. In addition to possible filler de-agglomeration and network disruption, the nanoscale of the filler may have further contributed to the non-linear response typified by the Payne effect. ... 

Ding, P., Orwa, M.G., and Pacek, A.W. 2009. De-agglomeration of hydrophobic and hydrophilic silica nanopowders in a high shear mixer. Powder Technol. 195 221-226. 

One way to do this is to go through the dispersion milling procedure and then analyze the particles in the dispersed state. Another way to accomplish the same end is to use an ultrasonic dispersion technique such as the one described by Shanefield and then determine the de-agglomerated particle size distribution. As described by Shanefield, the particle size thus determined is actually an aggregate size, since... 

Table 1.1 Overview of the terminology used in relation to particle size reduction, mixing and de-agglomeration ...

Triturating Mixing a solid with a solid, semisolid or liquid substance in such a ratio and intensity that agglomerates are dispersed (de-agglomeration) de-agglomeration may take place if the right medium is chosen... 

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