1. What are the advantages of this crystallization pathway?
Further advantages of this crystallization pathway are highly efficient mass fluxes that are independent of solubility products, the coupled high crystallization speeds, and crystallization without change of the pH value and the osmotic pressure.
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2. What are the contributions in "Mesocrystals: inorganic superstructures made by highly parallel crystallization and controlled alignment" ?
A review of the existing literature on mesoscale transformation of nanoparticles can be found in this paper.
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3. What are the future works mentioned in the paper "Mesocrystals: inorganic superstructures made by highly parallel crystallization and controlled alignment" ?
This principle delivers new tools and possibilities into the hands of chemists, as it is now possible to generate crystalline nano and mesostructures in a much broader and potentially useful way.. The authors thank the Max Planck Society for financial support.. Indeed, theoretical studies suggest that a nonspherical charged object in an electrolyte creates a screened electrostatic potential that is anisotropic at any distance [ 83 ] so that mutual ordering can be induced.. There are however some criteria by which the presence of a mesocrystal either as an intermediate or as the final product can be identified.
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4. What is the role of additives in the formation of nanocrystals?
Mesocrystal intermediates can also lead by fusion to the formation of single crystals with included organic additives, sometimes allowing the observation of highly oriented nano particle based intermediates.
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![Figure 6. Selected sequence of SEM images of progressive stages of self assembled (hierarchical) growth of fluorapatite aggregates in a gel atin gel (morphogenesis): from an elongated hexagonal prismatic seed (a) through dumbbell shapes (c f) to spheres (g); the surface of a just closed sphere also consists of needlelike units (h) following the general principles of self similarity. Intrinsic electric fields were sug gested control factor for the rod dumbbell sphere fractal growth. Pic ture reproduced from ref. [45].](/figures/figure-6-selected-sequence-of-sem-images-of-progressive-2ralckl3.webp)
![Figure 7. Left: SEM image of the fracture area of a central seed of a fractal composite aggregate. The fracture surface is dominated by a radial pattern. SEM (vacuum) was used instead of “environmental SEM” (freezing of sample) because areas of structural weakness are made visible more clearly by shrinking effects during evacuation (drying). Right: Idealized two dimensional arrangement of hexagonal nanoparticles forming a hexagonal nanoensemble (nanosuperstruc ture). The organic component inside and between the crystalline build ing units is omitted for clarity. The inner lines in the right Figure indi cate possible directions of preferred cleavage, the outer arrows show the radial structure of the cleavage. Reprinted from ref. [50] with per mission of the Royal Society of Chemistry.](/figures/figure-7-left-sem-image-of-the-fracture-area-of-a-central-2fau8jn0.webp)
![Figure 16. Top: AFM image of a CoC2O4·2H2O particle aged 1h in sus pension. Middle: Low voltage high resolution (LVHR) scanning elec tron micrograph of uncoated cobalt oxide dihydrate primary (PP) and secondary (SP) particles after 4 min reaction time. Bottom: LVHRSEM micrograph of cobalt oxide dihydrate mesocrystal formed from secon dary particle aggregates. The arrow pointing towards the end of the growing particle shows the agglomeration of polydisperse nanoparti cles of 23 nm size, whereas the other arrow pointing at the lateral external faces indicated the layer by layer growth on these faces. Figure reproduced from ref. [73] with permission of the American Chemical Society.](/figures/figure-16-top-afm-image-of-a-coc2o4-2h2o-particle-aged-1h-in-3hc4a3hb.webp)
![Figure 15. Schematic representation copper oxalate precipitation show ing the influence of HPMC on the three major steps of particle forma tion (h height, b breadth). Figure reproduced from ref. [69] with permission of Academic Press.](/figures/figure-15-schematic-representation-copper-oxalate-3boog0zj.webp)
![Figure 20. SEM image of helical BaCO3 fibers formed in presence of a stiff phosphonated block copolymer. Reproduced from ref. [84] with permission of Nature Publishing Group.](/figures/figure-20-sem-image-of-helical-baco3-fibers-formed-in-2pw692yd.webp)
