Read e-book online Nanocrystals Forming Mesoscopic Structures PDF

By Marie-Paule Pileni

Concentrating on either educational questions and purposes of self-assembly of this vitally important category of compounds, this e-book discusses not just the self-organization of inorganic and magnetic nanocrystals, but additionally their collective optical and magnetic homes, in addition to the in-situ fabrication of steel nanoparticles in strong matrices. Professor Marie-Paule Pileni, a unusual chief during this box, is joined by means of a choose staff of professional authors to supply 14 chapters protecting vital points of self-assembled nanomaterials. the result's worthwhile studying for inorganic and actual chemists, colloid chemists, polymer chemists, fabrics scientists, physicists, and chemical engineers operating with and/or constructing nanoparticle platforms.

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Taleb A, Pileni M. , Adv. Mater. 1998, 10, 259. , Murray C. , Science 2000, 287, 1989. , Pileni M. , Langmuir 2003, 19, 9486. , Pileni M. , submitted for publication. , Murray C. , J. Appl. Phys. 1999, 85, 4325. 70 Vedmantam T. , Liu J. , Sun. , J. Appl. Phys, 2003, 93, 7184.

32) Without a magnetic field applied during the evaporation process, large spherical aggregates are produced with C8 nanocrystals (Fig. 32 A), whereas smaller ones are obtained with the C10 derivative (Fig. 32 B) and, finally, randomly dispersed nanocrystals with C12 (Fig. 32 C). 59-T magnetic field, an evolution of the organization from chains to a random dispersion is observed (Fig. 32 E–G). Such a change in nanocrystal organization is correlated to the total interparticle potential energy which can be expressed as Utotal = UvdW + Udd + Usteric (see Chapter 3).

The 3D arrays are very inhomogeneous in size and shape (Fig. 9 A). In order to obtain more regular 3D superlattices, also called “supra” crystals, control of the solvent evaporation rate is required. For this, the substrate is directly immersed in the colloidal solution and the solvent is allowed to evaporate. The evaporation rate is controlled by either the substrate temperature or the solvent saturation degree of the surrounding atmosphere. By using this deposition process, “supra” crystals made of silver [20, 21] (Fig.

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