Easy-use and low-cost fiber-based two-color dynamic light-scattering apparatus

Lederer, Achim; Schöpe, Hans Joachim

doi:10.1103/physreve.85.031401

Cited by 13 publications

(14 citation statements)

References 34 publications

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“…A more systematic investigation of the evolution of the intensity autocorrelation function with  W is under way and will be published elsewhere. Future experiments will utilize a two-color cross correlation instrument to selectively study singly-scattered light [155]. To demonstrate solidification, we utilize TRS.…”

Section: Resultsmentioning

confidence: 99%

To make a glass—avoid the crystal

Palberg¹,

Bartsch²,

Beyer³

et al. 2016

J. Stat. Mech.

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Colloidal model systems allow for a flexible tuning of particle sizes, particle spacings and mutual interactions at constant temperature. Colloidal suspensions typically crystallize as soon as the interactions get sufficiently strong and long-ranged. Several strategies have been successfully applied to avoid crystallization and instead produce colloidal glasses. Most of these amorphous solids are formed at high particle concentrations. This paper shortly reviews experimental attempts to produce amorphous colloidal solids using strategies based on topological, thermodynamic and kinetic considerations. We complement this overview by introducing a (transient) amorphous solid forming in a thoroughly deionized aqueous suspension of highly charged spheres at low salt concentration and very low volume fractions.

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Section: Resultsmentioning

confidence: 99%

To make a glass—avoid the crystal

Palberg¹,

Bartsch²,

Beyer³

et al. 2016

J. Stat. Mech.

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“…The instrument covers the full range of accessible wave vectors known from DLS and in principle already now can be employed for measuring q-dependent collective diffusion. Remaining limitations in angular range resulting from the specific mounting of the sending and detection optics can be overcome by implementing the mounting scheme demonstrated in [17]. The instrument then will also cover the small q-range to measure self-diffusion from incoherently scattered light.…”

Section: Discussionmentioning

confidence: 99%

“…Cross-correlation experiments clearly performed better in the latter respect, since they detect singly scattered light only and can omit post recording discrimination. In fact, depending on the employed scheme, the detection threshold there is on the order of 1-5% transmission [15][16][17][18]24]. More important seems to be the precision with which the average relaxation time can be determined.…”

Section: Discussionmentioning

confidence: 99%

“…In water, only for systems of low refractive index, index matching is feasible, e.g., for perfluorinated polymer latex spheres [13]. However, full dynamic information can also be obtained for weakly or moderately multiple scattering systems from cross-correlation instruments [14][15][16][17], some of which are even available commercially [18]. A second issue is the non-ergodicity of samples displaying slow structural relaxations like polycrystalline solids, glasses, or gels.…”

Section: Introductionmentioning

confidence: 99%

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Demonstration of variable angle super-heterodyne dynamic light scattering for measuring colloidal dynamics

et al. 2020

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We demonstrate a prototype light scattering instrument combining a frequency domain approach to the intermediate scattering function from Super-Heterodyning Doppler Velocimetry with the versatility of a standard homodyne dynamic light scattering goniometer setup for investigations over a large range of scattering vectors. Comparing to reference experiments in correlation-time space, we show that the novel approach can determine diffusion constants and hence hydrodynamic radii with high precision and accuracy. Possible future applications are discussed shortly.

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“…The resulting systems are well accessible by optical methods like microscopy 12 and light scattering [13][14][15] up to largest volume fractions. Combining both approaches in a fruitful collaborative effort, important aspects like phase behaviour, glass transition and crystallization kinetics of one component colloidal spheres have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of colloidal binary mixtures with depletion attraction

et al. 2014

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In this work the crystallization kinetics of colloidal binary mixtures with attractive interaction potential (Asakura-Oosawa) has been addressed. Parameters such as fraction of crystals, linear crystal dimension and crystal packing have been quantified in order to understand how the crystal formation is driven in terms of the depth of the attractive potential and the composition of the binary mixture (described by the number ratio). It was found that inside the eutectic triangle, crystallization is mainly governed by nucleation and the crystal packing is close to the close-packing of hard spheres. Moving out from the eutectic triangle towards small component results in the crystallization of small spheres. Enrichment of the eutectic mixture with large component results in the crystallization of both large and small spheres, however, the kinetics are completely different from those of the eutectic composition. Crosslinked polystyrene microgels with nearly hard sphere interactions were used as model systems. Attraction was introduced by addition of linear polystyrene. The time evolution of crystallization has been followed by static light scattering.

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Easy-use and low-cost fiber-based two-color dynamic light-scattering apparatus

Cited by 13 publications

References 34 publications

To make a glass—avoid the crystal

To make a glass—avoid the crystal

Demonstration of variable angle super-heterodyne dynamic light scattering for measuring colloidal dynamics

Crystallization kinetics of colloidal binary mixtures with depletion attraction

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