Special aggregation morphology

Synthesis of Microporous Material with Special Aggregation Morphology in the Presence of Templates... 

As might be anticipated for minerals with chain structures, pyroxenes commonly occur in columnar, prismatic, rodlike, and acicular forms. Enstatite has been found in the form of rosettes of fine-fibrous crystals. Special names such as victorite, chladnite, and shepardite were assigned to different occurrences in this distinctive morphology, possibly because the fibrous aggregates were located in iron meteorites. However, the composition and crystal... 

Spicule formation in the larval stage of the sea urchin commences when mesenchyme cells migrate into special locations where they fuse forming a syncytium that produces a membrane-bound vacuole. The spicule morphology is directed by the size and orientation of the vacuole, which aggregate and connect through stalks... 

Preparation of microporous and porous materials with special states of aggregation such as nano and ultra-fine particles, large single crystals, perfect crystals, molecular sieve membranes, and materials with various morphologies ... 

The ABA triblocks which have been most exploited commercially are of the styrene-diene-styrene type, prepared by sequential polymerization initiated by alkyllithium compounds as shown in Eqs. (99-101) [263, 286]. The behavior of these block copolymers illustrates the special characteristics of block (and graft) copolymers, which are based on the general incompatibility of the different blocks [287]. Thus for a typical thermoplastic elastomer (263), the polystyrene end blocks (-15,000-20,000 MW) aggregate into a separate phase, which forms a microdispersion within the matrix composed of the polydiene chains (50,000-70,000 MW) [288-290]. A schematic representation of this morphology is shown in Fig. 3. This phase separation, which occurs in the melt (or swollen) state, results, at ambient temperatures, in a network of... 

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