Morphology hexagonal

The results of this work indicate that triangular and hexagonal morphologies are commonly and rapidly formed by evaporation, do not require bacteria, and have similar size distribution as those found naturally near a Au deposit in Western Australia. The inorganic process of groundwater evaporation is potentially the driving force for the formation of transported Au deposits in the vadose zone, particularly in arid and semi-arid regions of the world. 

Fig, 2.9 (a) TEM micrographs from the hexagonal morphology in Kraton TR1102, a PS-P8-PS block copolymer with fPS 0.24 (Dlugosz el at. 1970 Keller and Odell 1985). 

Fig. 7 Phase diagrams describing the solid-state nanoscale structure of A PS-PBLG and B PS-PZLL diblock copolymers C Illustration of the lamellar, double hexagonal and hexagonal morphologies found for the low molecular weight hybrid block copolymers...

Figure 8.5 SAXS patterns of oriented hexagonal morphologies in the system SI52QE516/D4 at 58°C (a) Azimuthally averaged scattering intensity, after background correction for (poA = 0.20 and 0.30 (with factor 10) (b) modeled powder structure factors (2" more likely).

Alternatively, a process based on the combustion synthesis starting with the elements initiated by electric field activation has been used by Xue and Munir [325]. Likewise, homogeneous single-phase AlN-SiC solid solution powders with well-crystallized hexagonal morphologies and a fine particle size of 3 pm have been obtained by Mei and Li through the combustion reaction of aluminum, carbon, and Si3N4 powder mixtures in air [326]. 

Pig. 19. Tetragonal (left column) and hexagonal morphologies (right column) of SBV heteroarm star terpolymers. The two lines are different by the symmetry positions of the B... 

It is also interesting to note that the sections between the crystals exhibit a typical hexagonal morphology. 

B block in symmetric S-B-M block copolymers, where B forms spheres [150,158] or cylinders at the lamellar interface between S and M, the corresponding polystyrene-block-poly(ethylene-co-butylene)-block-poly(methyl methacrylate) S-EB-M forms a hexagonal morphology, where S cylinders are surrounded by EB rings in an M matrix [150,159] (Figure 9). 

Figures Scheme for the change of the morphological behavior of a polystyrene-block-polybutadiene-block-poly(methyl methacrylate) S-B-M induced by hydrogenation of B to poly(ethylene-co-butylene) EB from a lamellar morphology with B spheres or B cylinders between S and M lamellae in an S-B-M triblock terpolymer to a hexagonal morphology, where EB rings surround S cylinders in an M matrix after hydrogenation.

The monosulfate group, also known as the AFm phase, is represented by the formula C4ASH12 or C3A CS Hj2. AFm stands for Al-Fe-mono, in which one mole of CS is present. In portland cement this phase forms after the AFt phase disappears. This phase may constitute about 10% of the solid phase in a mature cement paste. In SEM, this phase has a hexagonal morphology resembling that of Ca(OH)2 and the crystals are of sub-micrometer thickness. The principle ionic substitutions in the AFm phase are Fe for AP+, and OH", C03 , Cl", etc. for S04. The density of this phase is 2.02 g/ml. The amount of crystalline hydrogamet present in cement paste is less than 3 %. It is of the type Ca3 Al2(OH)j2 in which part... 

---