Continuous shell

In Fig. 6, we illustrate some different ways that the core-shell topology could be varied for silica and gold. So far we have considered the two normal core-shell structures. We now focus on the third example the assembly of Au Si02 nanoparticles onto spherical polystyrene latex colloids. The resulting spheres are also essentially different to continuous metal shells grown on colloid templates, which have been reported by Halas and colleagues [17] and by van Blaaderen and coworkers [18]. Such continuous shells display optical properties associated with resonances of the whole shell, and are therefore extremely sensitive to both core size and shell thickness, while in the system presented here... 

The core-shell morphology is best associated with high payloads and increased protection of the core material. A continuous shell around the core material provides equally continuous protection with no core material at or near the surface of the capsule. Furthermore, the location of shell material exclusively around the perimeter of the capsule leaves more capacity within to host the core material, resulting in payloads over 90%. 

FIGURE 47.6 Steps involved in coacervation process (a) core material dispersion in solution of shell polymer, (b) separation of coacervate from solution, (c) coating of core material by microdroplets of coacervate, and (d) coalescence of coacervate to form continuous shell around core particles. 

Pig. 1. Schematic diagrams of several possible capsule structures (a) continuous core/shell microcapsule in which a single continuous shell surrounds a continuous region of core material (b) multinuclear microcapsule in which a number of small domains of core material are distributed uniformly throughout a matrix of shell material and (c) continuous core capsule with two different shells. 

Continue shell-side flow. This heats the tubes. Waxy deposits are melted off. Harder deposits are spalled off due to thermal shock. 

Alkyd resin along with solvent has been successfully encapsulated inside UF shell by In situ encapsulation technique. The SEM analysis shows that microcapsules were comprised of a thin continuous shell wall and a rough exterior shell wall. The FTIR spectra of original and soxhlet extracted resin proves the encapsulation of alkyd resin inside the shell. Moreover DSC and TGA analysis shows that the microcapsules contain both resin-solvent mixture as core and UF as shell material. These microcapsules incorporated in paints or coatings release the healing material when scratched which in turn heals the scratches and cracks. 

In the continuous shell still process, several shell stills are linked in series to form a battery. Fresh feed continuously enters the first still, which is kept at the lowest temperature for the lightest overload produa. The bottoms from the first still are fed to the second still, which is kept at the temperature for the next highest boiling overhead product, and so on. The number of stills required depends on the number of produas needed. If the feed and the temperature of each still remain constant, the finished product is of satisfaaory quality. Exhibit 10-3 depicts the continuous shell still process, which is an improvement over the batch shell still operation. 

Similar to the continuous shell still, the fractional distillation process is made up of several stills linked together in series. The main diflference is that all the liquid condensate is returned to the upstream still. As the feed is partially vaporized in the first still, the va-... 

Inverse Opal Inverse opals have the opposite morphology to nanoparticle networks, where large voids are created in a three-dimensional, continuous shell of small crystallites. The open structure results... 

---