High-resolution particle sizing by optical tracking of single colloidal particles

Garbow, Norbert; Müller, Jürgen; Schätzel, Klaus; Palberg, Thomas

doi:10.1016/s0378-4371(96)00349-4

Cited by 25 publications

(26 citation statements)

References 10 publications

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“…Previous research has revealed two differing types of particle concentration dependence for this central electro-kinetic quantity. In studies on isolated particles in either aqueous [22] or organic solvent [23], very small mobilities were observed.In studies starting from very low concentrations, the mobility was found to first increase, but then to saturate with increasing particle number density, n (related to the volume fraction, , as: n = / V P = 3 / 4 a 3 where a is the particle radius) [24,25,26]. There, the transition to a concentration independent mobility seems to correlate to the onset of inter-particle ordering,…”

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confidence: 99%

An empirical correction for moderate multiple scattering in super-heterodyne light scattering

Botin

Mapa

Schweinfurth

et al. 2017

The Journal of Chemical Physics

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Frequency domain super-heterodyne laser light scattering is utilized in a low angle integral measurement configuration to determine flow and diffusion in charged sphere suspensions showing moderate to strong multiple scattering. We introduce an empirical correction to subtract the multiple scattering background and isolate the singly scattered light. We demonstrate the excellent feasibility of this simple approach for turbid suspensions of transmittance T 0.4. We study the particle concentration dependence of the electro-kinetic mobility in low salt aqueous suspension over an extended concentration regime and observe a maximum at intermediate concentrations.We further use our scheme for measurements of the self-diffusion coefficients in the fluid samples in the absence or presence of shear, as well as in polycrystalline samples during crystallization and coarsening. We discuss the scope and limits of our approach as well as possible future applications. PACS: if neededCorresponding author: Denis Botin dbotin@uni-mainz.de 2 INTRODUCTIONMultiple scattering (MS) strongly affects studies of turbid colloidal suspensions using Laser light scattering. Depending on the degree of MS, several different sophisticated approaches have been taken to use, correct for, or suppress MS in studies on suspension dynamics. At very large turbidities and small optical path lengths, suspension dynamics can be determined using diffusive wave spectroscopy (DWS) [1[2]]. In the regime of low to moderate multiple scattering, index matching is regularly employed [3, 4, 5], but it is not easily applicable in water based systems. Further, optical path lengths may be shortened by utilizing fibre optics [6]. In addition, cross correlation schemes [7] were pioneered by Phillies in the early eighties [8] and further developed to two-color or 2D cross correlation schemes [9, 10]. This way the methods and theory developed for (single) dynamic light scattering in the time domain [11] could be used also in turbid samples. Alternatively, in frequency domain, special mode selective heterodyne instrumentation was developed and applied to Brilluoin scattering [12,13,14]. Both cross correlation and mode selection, however, afford complex instrumentation and data evaluation schemes. A much simpler instrumentation is needed for the statistical analysis of heterodyne speckle fields taken at different times providing information about the velocity field in the fluid in a given plane perpendicular to the optical axis [15]. This information can be extracted, either by measuring their cross-correlation function or by recovering the power spectrum corresponding to the difference between the two speckle fields. Multiple scattering in this approach is minimized by using confocal geometry [16]. Yet another simple approach is path length resolved low coherence interferometry, which also is a static heterodyne technique [17,18]. There a certain small path length can be selected which corresponds to a single back-scattering event. Then only singly scattered light i...

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An empirical correction for moderate multiple scattering in super-heterodyne light scattering

Botin

Mapa

Schweinfurth

et al. 2017

The Journal of Chemical Physics

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“…Size determination yielded aϭ(155.5Ϯ1.4) nm. 28 The titratable number of surface charges was Nϭ2.3ϫ10 4 and the effective charge from conductivity was Z*ϭ1980. 29,30 PS301 is a highly charged, very monodisperse sample which crystallizes at comparably low packing fractions ⌽ or particle number densities nϭ⌽/(4/3)a 3 .…”

Section: A Sample Conditioning and Equilibrium Phase Behaviormentioning

confidence: 99%

“…We obtained a particle radius of 140 nm in reasonably good agreement with data from conventional static light scattering and other methods of radius determination. 28 Selected 2D scattering patterns for complete deionisation are shown in Fig. 5.…”

Section: B Fourier Microscopic Imagesmentioning

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Real space and Fourier microscopy of colloidal suspensions confined to a parallel plate geometry

Biehl

Palberg

2004

Review of Scientific Instruments

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“…Recently, a survey of different methods to determine the particle size in dilute suspensions has been published [5]. In addition, a sophisticated single particle tracking experiment has been applied to yield particle size distributions [6]. In this work, we exploited light scattering methods free from multiple scattering contributions for the careful determination of the radius of spherical standard latex particles suspended in water.…”

Section: Introductionmentioning

confidence: 99%

Particle Characterization Using Multiple Scattering Decorrelation Methods. Part 1: Standard Latex Particles

Sinn

Niehüser

Overbeck

et al. 1999

Part. Part. Syst. Charact.

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We determined the dimensions of standard polystyrene latex spheres suspended in water at different sample concentrations by dynamic light scattering and turbidimetry. Applying two different schemes for the decorrelation of multiple scattering, we show that the samples exhibit distortions of the auto-correlation function due to multiple scattering even at moderate volume fractions, which prohibits the correct determination of the particle radius. The cross-correlation functions, however, are free from these distortions. The recently deployed three-dimensional crosscorrelation setup is superior to the commercially available twocolor machine, as more turbid samples are accessible. In order to verify the results obtained by dynamic light scattering, we performed turbidity measurements with the same samples. This method is inherently free from multiple scattering contributions. We observe a systematically smaller radius in turbidimetry than in dynamic light scattering. The deviation, however, is only slightly outside the accuracy range of the measurements. We discuss possible origins for this deviation and show that our measurements are compatible with a hairy layer present on the particle's surface.

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High-resolution particle sizing by optical tracking of single colloidal particles

Cited by 25 publications

References 10 publications

An empirical correction for moderate multiple scattering in super-heterodyne light scattering

An empirical correction for moderate multiple scattering in super-heterodyne light scattering

Real space and Fourier microscopy of colloidal suspensions confined to a parallel plate geometry

Particle Characterization Using Multiple Scattering Decorrelation Methods. Part 1: Standard Latex Particles

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