The Nature and Implications of Uniformity in the Hierarchical Organization of Nanomaterials*

O’Brien, Matthew N.; Jones, Matthew R.; Mirkin, Chad A.

doi:10.1201/9781003056676-8

Cited by 4 publications

(4 citation statements)

References 49 publications

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“…S20 and S21 and Movie S3). Lastly, previous work has shown that large polydispersity can suppress colloidal crystallization completely (59,60). Here we observe the similar loss of close packing behavior when the polydispersity is greater than 10%, whereas consistent crystallographic rotation behavior can be achieved using particles with polydispersity smaller than 5%, including monosized particles (SI Appendix, Figs.…”

Section: Resultssupporting

confidence: 84%

Microscopic origins of the crystallographically preferred growth in evaporation-induced colloidal crystals

Goodrich

Yang

et al. 2021

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

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Unlike crystalline atomic and ionic solids, texture development due to crystallographically preferred growth in colloidal crystals is less studied. Here we investigate the underlying mechanisms of the texture evolution in an evaporation-induced colloidal assembly process through experiments, modeling, and theoretical analysis. In this widely used approach to obtain large-area colloidal crystals, the colloidal particles are driven to the meniscus via the evaporation of a solvent or matrix precursor solution where they close-pack to form a face-centered cubic colloidal assembly. Via two-dimensional large-area crystallographic mapping, we show that the initial crystal orientation is dominated by the interaction of particles with the meniscus, resulting in the expected coalignment of the close-packed direction with the local meniscus geometry. By combining with crystal structure analysis at a single-particle level, we further reveal that, at the later stage of self-assembly, however, the colloidal crystal undergoes a gradual rotation facilitated by geometrically necessary dislocations (GNDs) and achieves a large-area uniform crystallographic orientation with the close-packed direction perpendicular to the meniscus and parallel to the growth direction. Classical slip analysis, finite element-based mechanical simulation, computational colloidal assembly modeling, and continuum theory unequivocally show that these GNDs result from the tensile stress field along the meniscus direction due to the constrained shrinkage of the colloidal crystal during drying. The generation of GNDs with specific slip systems within individual grains leads to crystallographic rotation to accommodate the mechanical stress. The mechanistic understanding reported here can be utilized to control crystallographic features of colloidal assemblies, and may provide further insights into crystallographically preferred growth in synthetic, biological, and geological crystals.

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Section: Resultssupporting

confidence: 84%

Microscopic origins of the crystallographically preferred growth in evaporation-induced colloidal crystals

Goodrich

Yang

et al. 2021

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

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“…116 These ''surface ligands'' can, in turn, play important roles in nanoparticle synthesis to modulate nucleation, growth and agglomeration reaction kinetics and associated pathways. Surface ligands can regulate the accessibility and reactivity of the nanoparticle surface, [117][118][119] for example by passivating otherwise coordinatively unsaturated surface atoms and stabilizing the resultant ligated nanoparticles while inhibiting flocculation. Stabilizing ligands are likely often critical to determining the size and size-distribution of the final nanoparticles.…”

Section: Formation Of Semiconductor Nanoparticles Stabilized By Surface Ligandsmentioning

confidence: 99%

LaMer's 1950 model of particle formation: a review and critical analysis of its classical nucleation and fluctuation theory basis, of competing models and mechanisms for phase-changes and particle formation, and then of its application to silver halide, semiconductor, metal, and metal-oxide nanoparticles

2021

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“…Synthetic methods used to produce nanomaterials also produce a wide range of crystal defects and defect densities (O'Brien et al 2016). This effect is influenced by impurities in the material, which then lead to the instability.…”

Section: Instability and Defectmentioning

confidence: 99%

Review of emerging concepts in nanotoxicology: opportunities and challenges for safer nanomaterial design

Singh

Laux

Luch

et al. 2019

Toxicology Mechanisms and Methods

168

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Nanotoxicology and nanosafety has been a topic of intensive research for about more than 20 years. Nearly 10 000 research papers have been published on the topic, yet there exists a gap in terms of understanding and ways to harmonize nanorisk assessment. In this review, we revisit critically ignored parameters of nanoscale materials (e.g. band gap factor, phase instability and silver leaching problem, defect and instability plasmonic versus inorganic particles) versus their biological counterparts (cell batch-to-batch heterogeneity, biological barrier model design, cellular functional characteristics) which yield variability and nonuniformity in results. We also emphasize system biology approaches to integrate the high throughput screening methods coupled with in vivo and in silico modeling to ensure quality in nanosafety research. We emphasize and highlight the recommendation regarding bridging the mechanistic gaps in fundamental research and predictive biological response in nanotoxicology. The research community has to develop visions to predict the unforeseen problems that do not exist yet in context with nanotoxicity and public health hazards due to the burgeoning use of nanomaterial in consumer's product. ARTICLE HISTORY

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The Nature and Implications of Uniformity in the Hierarchical Organization of Nanomaterials*

Cited by 4 publications

References 49 publications

Microscopic origins of the crystallographically preferred growth in evaporation-induced colloidal crystals

Microscopic origins of the crystallographically preferred growth in evaporation-induced colloidal crystals

Review of emerging concepts in nanotoxicology: opportunities and challenges for safer nanomaterial design

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