Monodispersed Systems

Sugimoto, Tadao

doi:10.1016/b978-044489569-1/50026-9

Cited by 142 publications

(249 citation statements)

References 497 publications

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“…Uniform colloid particles, of micron and sub-micron sizes, synthesized in solution, have found numerous applications and were extensively studied experimentally, including a large body of recent work, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] with new developing emphasis on smaller, nanosize particles. Solution synthesis is an important approach because it avoids caging or templating the growing particles, thus allowing for better uniformity in their composition.…”

Section: Introductionmentioning

confidence: 99%

Shape Selection in Diffusive Growth of Colloids and Nanoparticles

2009

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We report numerical investigations of a three-dimensional model of diffusive growth of fine particles, the internal structure of which corresponds to different crystal lattices. A growing cluster (particle) is immersed in, and exchanges monomer building blocks with a surrounding medium of diffusing (off-lattice) monomers. On-surface dynamics of the latter is accounted for by allowing, in addition to detachment, monomer motion to the neighboring vacant crystal sites, according to probabilistic rules mimicking local thermalization. The key new feature of our model is the focus on the growth of a single cluster, emerging as a crystalline core, without development of defects that can control large-scale growth modes. This single, defect-free core growth is imposed by the specific dynamical rules assumed. Our results offer a possible explanation of the experimentally observed shape uniformity, i.e., fixed, approximately even-sized proportions, in synthesis of uniform colloids and nanoparticles. We demonstrate the basic principles of well-defined particle shape emergence in such growth. Specifically, several shapes are possible for a given crystal structure. Formation of shapes that follow the crystal symmetry and are uniform, can be a result of the nonequilibrium nature of the growth process. The shape of a growing particle can be controlled by varying the relative rates of kinetic processes, as well as by adjusting the concentration of monomers in the surrounding medium. ______________________________________________________________________________ Posted as e-print 0902.3243 at www.arxiv.org

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Section: Introductionmentioning

confidence: 99%

Shape Selection in Diffusive Growth of Colloids and Nanoparticles

2009

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“…These individual nanoparticles aggregate, perhaps through intermolecular p-p interactions, and their growth may be diffusioncontrolled. [16] Laser photolysis greatly influences the size of the Pd aggregates formed. In the initial step, efficient decomposition of [Pd(PPh 3 ) 4 ] accelerated by the intense laser pulse releases more palladium atoms during each pulse and causes the aggregation into larger palladium nanoparticles (20 AE 5 nm).…”

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confidence: 99%

Self‐Organization of Spherical, Core–Shell Palladium Aggregates by Laser‐Induced and Thermal Decomposition of [Pd(PPh₃)₄]

Ye¹,

Tan²,

Li³

et al. 2006

Angew Chem Int Ed

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Metal in the middle: Uniform, spherical, core–shell aggregates (100±20 nm; see picture) are obtained by photodecomposition of [Pd(PPh3)4] to form the metal core, followed by aggregation of smaller Pd nanocrystals and free phosphanes, produced by thermal decomposition of the remaining precursor, around this core. Prolonged irradiation or thermal decomposition alone yields only the core structure or the shell structure, respectively. This enables the nanoparticle structure to be tuned.

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“…The preparation of monodisperse nanoparticles with uniform size, shape and composition has been intensively pursed because of their scientific and technological interests [1][2][3][4]. The major advantage of monodisperse particles may be attributed to the uniform properties of individual particles, which makes the property of whole particles strictly controllable.…”

Section: Introductionmentioning

confidence: 99%