Nanoseparations: Strategies for size and/or shape-selective purification of nanoparticles

Kowalczyk, Bartłomiej; Lagzi, István; Grzybowski, Bartosz A.

doi:10.1016/j.cocis.2011.01.004

Cited by 259 publications

(211 citation statements)

References 115 publications

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“…Possible techniques for size fractionation are gel electrophoresis, 17,18 exclusion chromatography, 19 reversed micelle preparation, 20 size-selective precipitation (SSP) [21][22][23] or flow-field fractionation (FFF). [24][25][26] Detailed summaries of techniques used for separation of nanoparticles by their size and/ or shape are provided in reviews by Kowalczyk 27 and Mori. 28 For CuInS 2 nanocrystals, a broad absorbance spectrum without a well pronounced peak but with a long tail to lower energies was observed by several groups.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the size–property relationship in CuInS₂quantum dots

et al. 2015

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aIn this work we investigated fundamental properties of CuInS 2 quantum dots in dependence of the particle size distribution (PSD). Size-selective precipitation (SSP) with acetone as poor solvent was performed as an adequate post-processing step. Our results provide deep insight into the correlation between particle size and various optical characteristics as bandgap energy, absorption and emission features and the broadness of the emission signal. These structure-property relationships are only achieved due to the unique combination of different analytical techniques. Our study reveals that the removal of 10 wt% of smallest particles from the feed results in an enhancement of the emission signal. This improvement is ascribed to a decreased quenching of the emission in larger particles. Our results reveal the impact of PSDs on the properties and the performance of an ensemble of multicomponent QDs and anticipate the high potential of controlling PSDs by well-developed post-processing.

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Section: Introductionmentioning

confidence: 99%

Investigation of the size–property relationship in CuInS₂quantum dots

et al. 2015

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“…23,24 However, in most cases, the particles need to be purified after synthesis. 25 Furthermore, in all those methods using a given set of experimental (e.g., reaction) conditions and parameters provide just a given average size and shape of particles. To obtain monodisperse particles of various sizes, the experimental conditions and parameters must be changed and the procedure should be repeated.…”

Section: Introductionmentioning

confidence: 99%

Growth of Nanoparticles and Microparticles by Controlled Reaction-Diffusion Processes

et al. 2015

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Abstract. Synthesis of different size of nano-and microparticles is important in designing nanostructured materials with various properties. Wet synthesis methods lack flexibility to create various sizes of particles (particle libraries) using fixed conditions without the repetition of the steps of the method with a new set of parameters. Here, we report a synthesis method based on nucleation and particle growth in the wake of a moving chemical front in a gel matrix. The process yields well-separated regions (bands) filled with nearly mono-disperse nano-and microparticles, with the size of particles varying from band to band in a predictable way. The origin of the effect is due to an interplay of a precipitation reaction of the reagents and their diffusion that are controlled in space and time by the moving chemical front. The method represents a new approach and a promising tool for fast and competitive synthesis of various sizes of colloidal particles.

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“…This limitation arises from (i) the significant difference in mass and electron density between organic ligand shells relative to inorganic nanoparticle cores, which complicates the use of many probes that rely on these principles, and (ii) an insufficiently narrow distribution of structural properties of both the ligand (e.g., number, length) and nanoparticle (e.g., size, shape) that prevents distinction between inhomogeneities via separations techniques (26).…”

Section: Ligands Arranged On Nanoparticle Surfacesmentioning

confidence: 99%

“…Approaches to quantify nanoparticle structure can be broadly classified as ensemble techniques, which can evaluate the collective properties of a sample to provide population-level estimates of average structural parameters, or local techniques, which can directly probe the structure of individual nanoparticles. Because ensemble measurements cannot be deconvoluted without significant assumptions about structure and purity, but individual measurements can be built up into population-level statistics, the latter more quantitatively describes nanoparticle uniformity for heterogeneous populations (25)(26)(27). In particular, the automated, algorithmic analysis of electron microscopy (EM) images holds tremendous potential to improve the rigor of nanomaterial characterization.…”

Section: From Atoms To Crystalline Nanoparticlesmentioning

confidence: 99%

The nature and implications of uniformity in the hierarchical organization of nanomaterials

O’Brien

Jones

Mirkin

2016

Proc. Natl. Acad. Sci. U.S.A.

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In this Perspective, we present a framework that defines how to understand and control material structure across length scales with inorganic nanoparticles. Three length scales, frequently discussed separately, are unified under the topic of hierarchical organization: atoms arranged into crystalline nanoparticles, ligands arranged on nanoparticle surfaces, and nanoparticles arranged into crystalline superlattices. Through this lens, we outline one potential pathway toward perfect colloidal matter that emphasizes the concept of uniformity. Uniformity is of both practical and functional importance, necessary to increase structural sophistication and realize the promise of nanostructured materials. Thus, we define the nature of nonuniformity at each length scale as a means to guide ongoing research efforts and highlight potential problems in the field.nanomaterial | uniformity | colloidal crystal | dispersity | hierarchy

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Nanoseparations: Strategies for size and/or shape-selective purification of nanoparticles

Cited by 259 publications

References 115 publications

Investigation of the size–property relationship in CuInS₂quantum dots

Investigation of the size–property relationship in CuInS₂quantum dots

Growth of Nanoparticles and Microparticles by Controlled Reaction-Diffusion Processes

The nature and implications of uniformity in the hierarchical organization of nanomaterials

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Nanoseparations: Strategies for size and/or shape-selective purification of nanoparticles

Cited by 259 publications

References 115 publications

Investigation of the size–property relationship in CuInS2quantum dots

Investigation of the size–property relationship in CuInS2quantum dots

Growth of Nanoparticles and Microparticles by Controlled Reaction-Diffusion Processes

The nature and implications of uniformity in the hierarchical organization of nanomaterials

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Product

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Investigation of the size–property relationship in CuInS₂quantum dots

Investigation of the size–property relationship in CuInS₂quantum dots