Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Welch, David; Woehl, Taylor J.; Park, Chiwoo; Faller, Roland; Evans, James E.; Browning, Nigel D.

doi:10.1021/acsnano.5b06632

Cited by 53 publications

(67 citation statements)

References 47 publications

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“…Shape control of these structures can be achieved by tuning some of the synthesis parameters such as temperature, type of ligands, and interaction of the ligands with the precursors and/or the nanoparticles [4,5,6]. This means that the thermodynamics and kinetics of nucleation and growth can also be controlled [7,8]. Among the variety of possible shapes, nanorods are some of the most studied anisotropic materials as the combination of chemically induced growth and shape anisotropy can offer an additional level of control during self-assembly processes driven by structural and chemical selectivity [9,10].…”

Section: Introductionmentioning

confidence: 99%

Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels

2017

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We report on the synthesis of alpha manganese dioxide (α-MnO2) nanorods using natural extracts from Vitis vinifera grape stems and Malus domestica ‘Cortland’ apple peels. We used a two-step method to produce highly crystalline α-MnO2 nanorods: (1) reduction of KMnO4 in the presence of natural extracts to initiate the nucleation process; and (2) a thermal treatment to enable further solid-state growth of the nuclei. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) images provided direct evidence of the morphology of the nanorods and these images were used to propose nucleation and growth mechanisms. We found that the α-MnO2 nanorods synthesized using natural extracts exhibit structural and magnetic properties similar to those of nanoparticles synthesized via traditional chemical routes. Furthermore, Fourier transform infrared (FTIR) shows that the particle growth of the α-MnO2 nanorods appears to be controlled by the presence of natural capping agents during the thermal treatment. We also evaluated the catalytic activity of the nanorods in the degradation of aqueous solutions of indigo carmine dye, highlighting the potential use of these materials to clean dye-polluted water.

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Section: Introductionmentioning

confidence: 99%

Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels

2017

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“…Recent advances in in situ liquid cell transmission electron microscopy (TEM) enable probing the interactions between NPs and their self‐assembly by direct nanoscale imaging of their real‐time dynamics in thin liquid films . This direct imaging approach has made it possible to explore how electrostatic, magnetic, van der Waals, molecular, capillary, and hydration forces between the NPs affect their time‐dependent self‐assembly.…”

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confidence: 99%

Nanoparticle Interactions Guided by Shape‐Dependent Hydrophobic Forces

et al. 2018

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Self-assembly of solvated nanoparticles (NPs) is governed by numerous competing interactions. However, relatively little is known about the time-dependent mechanisms through which these interactions enable and guide the nanoparticle self-assembly process. Here, using in situ transmission electron microscopy imaging combined with atomistic modeling, it is shown that the forces governing the self-assembly of hydrophobic nanoparticles change with the nanoparticle shapes. By comparing how gold nanospheres, nanocubes, nanorods, and nanobipyramids assemble, it is shown that the strength of the hydrophobic interactions depends on the overlap of the hydrophobic regions of the interacting nanoparticle surfaces determined by the nanoparticle shapes. Specifically, this study reveals that, in contrast to spherical nanoparticles, where van der Waals forces play an important role, hydrophobic interactions can be more relevant for nanocubes with flat side faces, where an oriented attachment between the nanocubes is promoted by these interactions. The attachment of nanocubes is observed to proceed in two distinct pathways: nanocubes either: (i) prealign their faces before the attachment, or (ii) first connect through a misaligned (edge-to-edge) attachment, followed by a postattachment alignment of their faces. These results have important implications for understanding the interaction dynamics of NPs and provide the framework for the design of future self-assembled nanomaterials.

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“…The electron beam firstly transfers energy to the irradiated medium, which results in the generation of radical and molecular species [33]. The irradiation products continue to react, causing a cascade of chemical reactions and a production of various additional species [34]. Owing to the diffusion and reaction of these species, the chemical distribution in the reactor changes spatiotemporally.…”

Section: Introductionmentioning

confidence: 99%

In Situ Investigation of Dynamic Silver Crystallization Driven by Chemical Reaction and Diffusion

Liu

Dou

et al. 2020

Research

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Rational synthesis of materials is a long-term challenging issue due to the poor understanding on the formation mechanism of material structure and the limited capability in controlling nanoscale crystallization. The emergent in situ electron microscope provides an insight to this issue. By employing an in situ scanning electron microscope, silver crystallization is investigated in real time, in which a reversible crystallization is observed. To disclose this reversible crystallization, the radicals generated by the irradiation of electron beam are calculated. It is found that the concentrations of radicals are spatiotemporally variable in the liquid cell due to the diffusion and reaction of radicals. The fluctuation of the reductive hydrated electrons and the oxidative hydroxyl radicals in the cell leads to the alternative dominance of the reduction and oxidation reactions. The reduction leads to the growth of silver crystals while the oxidation leads to their dissolution, which results in the reversible silver crystallization. A regulation of radical distribution by electron dose rates leads to the formation of diverse silver structures, confirming the dominant role of local chemical concentration in the structure evolution of materials.

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Understanding the Role of Solvation Forces on the Preferential Attachment of Nanoparticles in Liquid

Cited by 53 publications

References 47 publications

Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels

Oriented Growth of α-MnO2 Nanorods Using Natural Extracts from Grape Stems and Apple Peels

Nanoparticle Interactions Guided by Shape‐Dependent Hydrophobic Forces

In Situ Investigation of Dynamic Silver Crystallization Driven by Chemical Reaction and Diffusion

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