Measurement of absolute particle-surface separation using total internal reflection microscopy and radiation pressure forces

Brown, Murray A.; Staples, E.

doi:10.1021/la00097a012

Cited by 22 publications

(10 citation statements)

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“…Many of these studies have used total internal reflection microscopy (TIRM) to measure the hydrodynamically hindered particle motion under various conditions [13–16]. A noteworthy example of this is the study performed by Oetama and Walz [17], who directly measured the motion of 15- μ m-diam particles about 50–100 nm from a surface.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of an optically confined nanoparticle diffusing normal to a surface

2016

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Here we measure the hindered diffusion of an optically confined nanoparticle in the direction normal to a surface, and we use this to determine the particle-surface interaction profile in terms of the absolute height. These studies are performed using the evanescent field of an optically excited single-mode silicon nitride waveguide, where the particle is confined in a height-dependent potential energy well generated from the balance of optical gradient and surface forces. Using a high-speed CMOS camera, we demonstrate the ability to capture the short time-scale diffusion dominated motion for 800-nm-diam polystyrene particles, with measurement times of only a few seconds per particle. Using established theory, we show how this information can be used to estimate the equilibrium separation of the particle from the surface. As this measurement can be made simultaneously with equilibrium statistical mechanical measurements of the particle-surface interaction energy landscape, we demonstrate the ability to determine these in terms of the absolute rather than relative separation height. This enables the comparison of potential energy landscapes of particle-surface interactions measured under different experimental conditions, enhancing the utility of this technique.

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Section: Introductionmentioning

confidence: 99%

Dynamics of an optically confined nanoparticle diffusing normal to a surface

2016

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“…Adamczyk et al [3] experimentally confirmed Brenner's correction factor to the bulk particle mobility by measuring the sedimentation rate of nylon spheres through a viscous oil toward different shaped surfaces. Brown and Staples [4][5][6] studied the dynamics of Brownian particles above a quartz plate at small separation distance using the combined optical techniques of radiation pressure and total internal reflection microscopy (TIRM). The authors calculated the absolute separation distance of the particle from the surface assuming Brenner's lubrication theory to be valid.…”

Section: Introductionmentioning

confidence: 99%

A new approach for analyzing particle motion near an interface using total internal reflection microscopy

Oetama

Walz

2005

Journal of Colloid and Interface Science

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“…For the microspheres used in the experiments described here, incorporation of optical anisotropy is ideal as long as the particle surface roughness remains unaffected. Also, precise measurement of the height of the microsphere with respect to the glass surface in real time, for example by using total internal reflection microscopy techniques [33,39], could elucidate the phenomenon of rolling while slipping, by verifying when microsphere-surface contact occurs.…”

Section: Discussionmentioning

confidence: 99%

Slipping friction of an optically and magnetically manipulated microsphere rolling at a glass-water interface

Agayan

Smith

Kopelman

2008

Journal of Applied Physics

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The motion of submerged magnetic microspheres rolling at a glass-water interface has been studied using magnetic rotation and optical tweezers combined with bright-field microscopy particle tracking techniques. Individual microspheres of varying surface roughness were magnetically rotated both in and out of an optical trap to induce rolling, 2 along either plain glass cover slides or glass cover slides functionalized with polyethylene glycol. It has been observed that the manipulated microspheres exhibited nonlinear dynamic rolling-while-slipping motion characterized by two motional regimes: At low rotational frequencies, the speed of microspheres free-rolling along the surface increased proportionately with magnetic rotation rate; however, a further increase in the rotation frequency beyond a certain threshold revealed a sharp transition to a motion in which the microspheres slipped with respect to the external magnetic field resulting in decreased rolling speeds. The effects of surface-microsphere interactions on the position of this threshold frequency are posed and investigated. Similar experiments with microspheres rolling while slipping in an optical trap showed congruent results.

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Measurement of absolute particle-surface separation using total internal reflection microscopy and radiation pressure forces

Cited by 22 publications

References 0 publications

Dynamics of an optically confined nanoparticle diffusing normal to a surface

Dynamics of an optically confined nanoparticle diffusing normal to a surface

A new approach for analyzing particle motion near an interface using total internal reflection microscopy

Slipping friction of an optically and magnetically manipulated microsphere rolling at a glass-water interface

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