Changes in the Shape and Mobility of Colloidal Gold Nanorods with Electrospray and Differential Mobility Analyzer Methods

Song, Dong Keun; Lenggoro, I. Wuled; Hayashi, Yoshimasa; Okuyama, Kikuo; Kim, Sang Soo

doi:10.1021/la0513196

Cited by 40 publications

(34 citation statements)

References 20 publications

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“…When considering the relationship between particle mobility diameter and particle shape it is worth reminding that changes in particle shape can result in large changes in mobility diameters, as it was illustrated in the recent study by Song et al (2005), where the particles' mobility diameter decreased from 55 nm to 25 nm as a result of the change in their shape; from rod-like with an aspect ratio of 5.6 to nearly spherical. Since the present study focuses only on changes in particle orientation, while the particle shape remains constant, the corresponding changes in mobility diameter are expected to be smaller.…”

Section: Introductionmentioning

confidence: 98%

“…From these studies they were able to deduce the orientation dependent DSFs for the two PSL agglomerates. In a very recent publication Song et al (2005) described the results of a very elegant experiment designed to investigate the relationship between the mobility diameter of gold nanoparticles and their shapes. The changes in the shape and the mobility diameters of gold nanoparticles as a function of temperature were observed using Scanning Electron Microscopy (SEM) and the DMA.…”

Section: Introductionmentioning

confidence: 99%

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On the Effect of Particle Alignment in the DMA

Zelenyuk

Imre²

2007

Aerosol Science and Technology

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The Differential Mobility Analyzer (DMA) is designed to measure particle mobility diameter, which for spherical particles is equal to particle volume equivalent diameter. In contrast, the mobility diameter of aspherical particles is a function of the particle shape and orientation. The magnitude of the DMA electric fields is such that it can cause aspherical particles to align preferentially in a specific orientation. The same electric field and the sheath flow rate (q sh ) define the particle mobility diameter. But, the fact that particle orientation depends on the electric field makes the dynamic shape factor and hence the mobility diameter depend on q sh . Here, we describe an operating procedure that relies on a tandem DMA system, in which the second DMA is operated at a number of q sh , to obtain information about particle shape by measuring the effect of particle alignment on the particle mobility diameter. We show how the relationship between the mobility diameter and q sh can even be used to physically separate particles according to their shapes. In addition we explore the use of simultaneous measurements of particle alignment and particle vacuum aerodynamic diameters to gain further information on particle shape and account for particle alignment in the calculations of dynamic shape factor. We first test this approach on doublets and compact triplets of PSL spheres, for which the orientation dependent dynamic shape factors are known. We then investigate applications on a number of polydisperse particle systems of various shapes. INTRODUCTIONFor spherical particles the mobility diameter is well defined and is equal to particle volume equivalent diameter. However, Address correspondence to Alla Zelenyuk, Pacific Northwest National Laboratory, PO Box 999, MSIN K8-88, Richland, WA 99354, USA. E-mail: alla.zelenyuk@pnl.gov because particle mobility diameter is a measure of particle behavior and not of particle intrinsic property, for aspherical particles whose behavior in the DMA depends on the particle shape and the electric field, the relationship between the mobility diameter and volume equivalent diameter can be complex. Very little attention has been paid to the effects of asphericity on the particle mobility diameter and to how to use the relationship between the two to obtain information about particle shape.With the advent of aerosol instrumentation it is becoming more common to use Differential Mobility Analyzers (DMAs) to classify or select particles with a narrow distribution of mobility diameters for interrogation by a second instrument to determine, for example, particle density (Katrib et al. 2004;McMurry et al. 2002;Slowik et al. 2004;Zelenyuk et al. 2006), or hygroscopicity and composition (Buzorius et al. 2002). Combining a number of instruments in a series with a DMA upfront makes the need to take into account particle asphericity all the more important because the rigorous interpretation of these detailed measurements, must take particle shape into account. For particles of unknown shapes...

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

On the Effect of Particle Alignment in the DMA

Zelenyuk

Imre²

2007

Aerosol Science and Technology

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“…Though several techniques are available to quantify the length distributions of nanorods and nanotubes, ES-DMA remains competitive (see Section 3 for a detailed comparison). Several authors have reported the characterization of rod-or tube-like particles, such as, gold nanorods and multi-walled carbon nanotubes [Baron et al, 1994;Chen et al, 1993;Deye et al, 1999;, 2006, 2007aMoisala et al, 2005;Song et al, 2005]. Song, et al, used a shape factor analysis to convert the average mobility diameter into the average length of gold nanorods.…”

Section: Nanotubes and Nanorodsmentioning

confidence: 99%

Rapid Nanoparticle Characterization

Anumolu¹,

Pease²

2012

The Delivery of Nanoparticles

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“…NSBs may include long-chain molecules, nanorods and nanotubes. Applications range from drag on cylinders or chains of spheres [1], size classification of fiberous aerosols [2][3][4][5][6], ion mobility of long-chain molecules and biomolecules [7][8][9], gas-phase synthesis, separation and characterization of nanotubes and nanorods [10][11][12][13][14][15][16][17][18][19][20], to transport properties of long-chain hydrocarbons in reacting flows [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Drag force and transport property of a small cylinder in free molecule flow: A gas-kinetic theory analysis

Liu

Wang

2016

Phys. Rev. E

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Analytical expressions are derived for aerodynamic drag force on small cylinders in the free molecule flow using the gas kinetic theory. The derivation considers the effect of intermolecular interactions between the cylinder and gas media. Two limiting collision models, specular and diffuse scattering, are investigated in two limiting cylinder orientations with respect to the drift velocity. The earlier solution of Dahneke (B. E. Dahneke, Journal of Aerosol Science 4, 147, 1973) is shown to be a special case of the current expressions in the rigid-body limit of collision.Drag force expressions are obtained for cylinders that undergo Brownian rotation and for those that align with the drift velocity. The validity of the theoretical expressions is tested against experimental mobility data available for carbon nanotubes.

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Changes in the Shape and Mobility of Colloidal Gold Nanorods with Electrospray and Differential Mobility Analyzer Methods

Cited by 40 publications

References 20 publications

On the Effect of Particle Alignment in the DMA

On the Effect of Particle Alignment in the DMA

Rapid Nanoparticle Characterization

Drag force and transport property of a small cylinder in free molecule flow: A gas-kinetic theory analysis

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