Dynamics of Individual Single-Walled Carbon Nanotubes in Water by Real-Time Visualization

Duggal, Rajat; Pasquali, Matteo

doi:10.1103/physrevlett.96.246104

Cited by 147 publications

(131 citation statements)

References 34 publications

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“…33 We observe that these long nanotubes undergo moderate, thermally induced bending at radii of curvature down to ϳ5Ϫ10 m. Therefore, the shorter SWCNTs (Ͻ1Ϫ2 m long) that predominate in our diffusional studies have negligible bending and can properly be treated as rigid rods in the following optical analysis. We note, however, that stiffness is expected to depend on diameter, 23,34 and further studies to quantify SWCNT bending stiffness as a function of structure are in progress.…”

Section: Resultsmentioning

confidence: 90%

Translational and Rotational Dynamics of Individual Single-Walled Carbon Nanotubes in Aqueous Suspension

et al. 2008

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Section: Resultsmentioning

confidence: 90%

Translational and Rotational Dynamics of Individual Single-Walled Carbon Nanotubes in Aqueous Suspension

et al. 2008

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“…The ability to align the SWNTs using a directed air stream is due to SWNTs rigid rod behavior in solution. 25,26 Shear-induced alignment of SWNTs has also been observed in films 27,28 and fibers. 29 In order to better understand the LBL process, dispersions with different SWNT concentrations were produced with and without added electrolyte.…”

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confidence: 98%

Strong Antimicrobial Coatings: Single-Walled Carbon Nanotubes Armored with Biopolymers

et al. 2008

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Large scale biomimetic single-walled carbon nanotube (SWNT) coatings with significant antimicrobial activity, high Young's Modulus, and controlled morphology were fabricated using layer-by-layer assembly. Thickness was controlled within 1.6 nm and SWNT orientation was controlled using a directed air stream. This unique blend of multifunctionality and vertical and lateral control of a bottom-up assembly process is a significant advancement in developing macroscale assemblies with the combined attributes of SWNTs and natural materials.Concern about the spread of infections through contact with contaminated surfaces was once limited to specific groups of people including astronauts who are subject to confined living spaces and the virulence-enhancing effects of space flight 1 and people requiring surgery or implantable devices. 2 More recently, there has been growing concern about the role of contaminated surfaces in the spread of infections such as severe acute respiratory syndrome (SARS), 3,4 and Staphylococcus aureus, particularly methicillin-resistant Staphylococcus aureus (MSRA). 5 Antimicrobial surfaces are therefore desirable not only for the aerospace, defense, and medical industries but also for the consumer product and public transportation industries. We have used layer-by-layer assembly to produce coatings that combine the strength of single-walled carbon nanotubes (SWNTs) with the antimicrobial activity of lysozyme (LSZ).LSZ, a key member of ova-antimicrobials, is a powerful natural antibacterial protein. 6 It is in the class of enzymes which lyse the cell walls of Gram-positive bacteria by hydrolyzing the -1,4 linkage between N-acetylmuramic acid (NAM) and N-acetylglucosamine (NAG) of gigantic polymers in the peptidoglycan (murein). 7,8 Unlike many antimicrobials, LSZ has both enzymatic and nonenzymatic activity in both its native and denatured states and is useful even in processes which require heat treatment. The potential use of LSZ as an antimicrobial agent in pharmaceuticals, food preservatives, and packaging is an active area of research, 7,8 but the effective use of LSZ requires incorporating it with a more mechanically robust material. SWNTs are well-known for exceptional combination of mechanical, electrical, thermal, and optical properties. 9-11 However, the efficient transfer of SWNTs' inherent nanoscale properties to macroscopic structures and devices has been an ongoing research challenge comprised of three main issues: SWNT dispersion, controlled assembly, and efficient load transfer. There has been growing interest in using biological materials to stabilize dispersions of pristine SWNTs. DNA enables much higher concentrations of dispersions of individual and small bundles of SWNTs 11,12 than any other known material besides superacids; 13,14 DNA-SWNT dispersions have even been used to produce liquid crystalline dispersions for solution spinning. 15 Similarly, favorable intermolecular interactions enable dispersion of individual and small bundles of SWNTs in proteins such as LSZ...

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“…14 On the experimental side, even for the simplest case of axisymmetric particles (e.g., rods or spheroids), tracking of the orientation of the axis of symmetry is required, which is, of course, much more difficult than tracking of the center of mass. For this reason, the first experimental measurements have been limited to particles strongly confined between two parallel walls [15][16][17][18] (quasi-2D confinement), where the particle axis of symmetry remains around the gap midplane, parallel to the walls. Quite recently, the 3D tracking of both oriena) marco.decorato@unina.it tation and center of mass of elongated particles has been reported.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and Brownian motions of a spheroid near a rigid wall

Corato

Greco

D’Avino

et al. 2015

The Journal of Chemical Physics

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Articles you may be interested in PHYSICS 142, 194901 (2015) Hydrodynamics and Brownian motions of a spheroid near a rigid wall In this work, we study in detail the hydrodynamics and the Brownian motions of a spheroidal particle suspended in a Newtonian fluid near a flat rigid wall. We employ 3D Finite Element Method (FEM) simulations to compute how the mobility tensor of the spheroid varies with both the particle-wall separation distance and the particle orientation. We then study the Brownian motion of the spheroid by means of a discretized Langevin equation. We specifically focus on the additional drift terms arising from the position and orientational dependence of the mobility matrix. In this respect, we also propose a numerically convenient approximation of the orientational divergence of the mobility matrix that is required in the solution of the Langevin equation. Our results illustrate that both hydrodynamics and Brownian motions of a spheroidal particle near a confining wall display novel features from those of a sphere in the same type of confinement. C 2015 AIP Publishing LLC. [http://dx

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Dynamics of Individual Single-Walled Carbon Nanotubes in Water by Real-Time Visualization

Cited by 147 publications

References 34 publications

Translational and Rotational Dynamics of Individual Single-Walled Carbon Nanotubes in Aqueous Suspension

Translational and Rotational Dynamics of Individual Single-Walled Carbon Nanotubes in Aqueous Suspension

Strong Antimicrobial Coatings: Single-Walled Carbon Nanotubes Armored with Biopolymers

Hydrodynamics and Brownian motions of a spheroid near a rigid wall

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