Fracture and Failure of Nanoparticle Monolayers and Multilayers

Wang, Yifan; Kanjanaboos, Pongsakorn; Barry, Edward; McBride, Sean; Lin, Xiao‐Min; Jaeger, Heinrich M.

doi:10.1021/nl404185b

Cited by 34 publications

(47 citation statements)

References 34 publications

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“…Multi-million atom simulations of NP membranes like those shown in Fig. 1(a) allow us to simultaneously measure nanoscale interactions while directly comparing membrane properties with those found experimentally [1,2,9]. Our simulations show that the interactions between end-groups on the encoded ligands play a dominant role in determining membrane strength and stiffness.…”

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confidence: 70%

High Strength, Molecularly Thin Nanoparticle Membranes

et al. 2014

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confidence: 70%

High Strength, Molecularly Thin Nanoparticle Membranes

et al. 2014

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“…1a-d. NP films were prepared by sequentially depositing monolayers of AuNPs using a slightly modified procedure from what we have used previously to form free-standing NP monolayers of various core materials and encapsulating ligands [20][21][22][23] (see Methods). Briefly, NP monolayers were draped one monolayer at a time onto the PC substrate, and the process repeated until a desired number of transfers were obtained.…”

Section: Resultsmentioning

confidence: 99%

“…Subsequently, B40 ml of a toluene solution containing dDT-AuNPs was added to the three-phase contact line of the water droplet. Under these conditions, the insolubility of water and the dDT-AuNP toluene solution drives the formation of NP monolayers at the air-water interface, which can then be subsequently transferred to different substrates [20][21][22][23] . Here immediately after the toluene evaporated (B10 min), the monolayer was gently draped on the PC membrane by simultaneously tilting the Petri dish and removing the water via a pipette.…”

Section: Methodsmentioning

confidence: 99%

“…Owing to the flexibility by which ligated NPs can be synthesized, including both the core materials themselves and the encapsulating ligands 43,44 , we believe the approach outlined here can be generalized to a similar set of functionalities as their SAM counterparts for different core materials. Previous work has already demonstrated that strong ligand-ligand interactions required for NP film stability are attainable not only for alkanethiol-AuNPs [20][21][22]45,46 , but other core materials such as cobalt oxide and iron oxide with oleylamine and oleic acid ligands 21 , as well as DNA-coated NPs 47 . The end result is a potentially powerful route towards engineering a set of desired interactions in which colloidal NPs are functionalized a priori with the desired functionality 48,49 .…”

Section: Article Nature Communications | Doi: 101038/ncomms6847mentioning

confidence: 99%

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Ion transport controlled by nanoparticle-functionalized membranes

et al. 2014

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From proton exchange membranes in fuel cells to ion channels in biological membranes, the well-specified control of ionic interactions in confined geometries profoundly influences the transport and selectivity of porous materials. Here we outline a versatile new approach to control a membrane's electrostatic interactions with ions by depositing ligand-coated nanoparticles around the pore entrances. Leveraging the flexibility and control by which ligated nanoparticles can be synthesized, we demonstrate how ligand terminal groups such as methyl, carboxyl and amine can be used to tune the membrane charge density and control ion transport. Further functionality, exploiting the ligands as binding sites, is demonstrated for sulfonate groups resulting in an enhancement of the membrane charge density. We then extend these results to smaller dimensions by systematically varying the underlying pore diameter. As a whole, these results outline a previously unexplored method for the nanoparticle functionalization of membranes using ligated nanoparticles to control ion transport.

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“…Dodecane thiol-ligated gold nanoparticles were synthesized via a digestive ripening method followed by extensive washing with ethanol and finally dissolution in toluene [15]. This process yielded nanoparticles with diameter 5.2 nm and ligand lengths 1.7 nm.…”

Section: Methodsmentioning

confidence: 99%

Conforming Nanoparticle Sheets to Surfaces with Gaussian Curvature

Mitchell

2020

Springer Theses

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Nanoparticle monolayer sheets are ultrathin inorganic-organic hybrid materials that combine highly controllable optical and electrical properties with mechanical flexibility and remarkable strength. Like other thin sheets, their low bending rigidity allows them to easily roll into or conform to cylindrical geometries. Nanoparticle monolayers not only can bend, but also cope with strain through local particle rearrangement and plastic deformation. This means that, unlike thin sheets such as paper or graphene, nanoparticle sheets can much more easily conform to surfaces with complex topography characterized by non-zero Gaussian curvature, like spherical caps or saddles. Here, we investigate the limits of nanoparticle monolayers' ability to conform to substrates with Gaussian curvature by stamping nanoparticle sheets onto lattices of larger polystyrene spheres. Tuning the local Gaussian curvature by increasing the size of the substrate spheres, we find that the stamped sheet morphology evolves through three characteristic stages: from full substrate coverage, where the sheet extends over the interstices in the lattice, to coverage in the form of caps that conform tightly to the top portion of each sphere and fracture at larger polar angles, to caps that exhibit radial folds. Through analysis of the nanoparticle positions, obtained from scanning electron micrographs, we extract the local strain tensor and track the onset of strain-induced dislocations in the particle arrangement. By considering the interplay of energies for elastic and plastic deformations and adhesion, we construct arguments that capture the observed changes in sheet morphology as Gaussian curvature is tuned over two orders of magnitude.While any flat thin sheet can easily be rolled into a cylinder, common experience suggests that conforming the same sheet to a sphere is considerably more difficult. In order to accommodate the curvature of the sphere, one must fold, cut, or stretch the sheet. On surfaces with Gaussian curvature -that is, curvature in two independent directions, such as on a sphere or saddle -triangles no longer have interior angles which sum to 180 • . Conforming a flat sheet tightly to such a surface thus necessarily introduces stresses from stretching or compression. If the stresses build up, the material may respond by delaminating, forming cracks or dislocations, or forming folds [1,2]. For applications where initially flat sheets are to conform to arbitrary surface topographies, the ability to cope with Gaussian curvature therefore translates into a requirement for high bendability combined with an ability to deform locally in-plane, either elastically or plastically.In close-packed nanoparticle monolayers, individual metallic or semiconducting particle cores are embedded in a matrix of interpenetrating ligand molecules that are attached to each core [3,4]. This organic matrix largely determines the sheet's mechanical properties. While these properties have been studied for sheets in planar geometries [5][6][7] and for cylindri...

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Fracture and Failure of Nanoparticle Monolayers and Multilayers

Cited by 34 publications

References 34 publications

High Strength, Molecularly Thin Nanoparticle Membranes

High Strength, Molecularly Thin Nanoparticle Membranes

Ion transport controlled by nanoparticle-functionalized membranes

Conforming Nanoparticle Sheets to Surfaces with Gaussian Curvature

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