Investigation of q-dependent dynamical heterogeneity in a colloidal gel by x-ray photon correlation spectroscopy.

doi:10.1103/PHYSREVE.76.051404

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Investigation of q-dependent dynamical heterogeneity in a colloidal gel by x-ray photon correlation spectroscopy.

Journal Article•DOI•

Investigation of q-dependent dynamical heterogeneity in a colloidal gel by x-ray photon correlation spectroscopy.

Veronique Trappe¹, Estelle Pitard², Laurence Ramos², Aymeric Robert³, Hugo Bissig¹, Luca Cipelletti² - Show less +2 more•Institutions (3)

University of Fribourg¹, University of Montpellier², European Synchrotron Radiation Facility³

15 Nov 2007-Physical Review E (American Physical Society)-Vol. 76, Iss: 5, pp 051404

TL;DR: This work uses time-resolved x-ray photon correlation spectroscopy to investigate the slow dynamics of colloidal gels made of moderately attractive carbon black particles and proposes a simple scaling argument for the q-dependence of fluctuations in glassy systems that rationalizes findings.

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Abstract: We use time-resolved X-Photon Correlation Spectroscopy to investigate the slow dynamics of colloidal gels made of moderately attractive carbon black particles. We show that the slow dynamics is temporally heterogeneous and quantify its fluctuations by measuring the variance $\chi$ of the instantaneous intensity correlation function. The amplitude of dynamical fluctuations has a non-monotonic dependence on scattering vector $q$, in stark contrast with recent experiments on strongly attractive colloidal gels [Duri and Cipelletti, \textit{Europhys. Lett.} \textbf{76}, 972 (2006)]. We propose a simple scaling argument for the $q$-dependence of fluctuations in glassy systems that rationalizes these findings.

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Glassy dynamics and dynamical heterogeneity in colloids

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Luca Cipelletti, Eric R. Weeks

04 Jul 2011-arXiv: Soft Condensed Matter

TL;DR: In this article, the authors review the phenomena associated with the colloidal glass transition, and in particular discuss observations of spatial and temporally heterogeneous dynamics within colloidal samples near the glass transition.

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Abstract: Concentrated colloidal suspensions are a well-tested model system which has a glass transition. Colloids are suspensions of small solid particles in a liquid, and exhibit glassy behavior when the particle concentration is high; the particles are roughly analogous to individual molecules in a traditional glass. Because the particle size can be large (100 nm - 1000 nm), these samples can be studied with a variety of optical techniques including microscopy and dynamic light scattering. Here we review the phenomena associated with the colloidal glass transition, and in particular discuss observations of spatial and temporally heterogeneous dynamics within colloidal samples near the glass transition. Although this Chapter focuses primarily on results from hard-sphere-like colloidal particles, we also discuss other colloidal systems with attractive or soft repulsive interactions.

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414 citations

Cites background from "Investigation of q-dependent dynami..."

...…beam stability is often still an issue, several XPCS studies on the slow dynamics of colloidal systems have been published in the last years (Bandyopadhyay et al., 2004; Chung et al., 2006; Robert et al., 2006; Trappe et al., 2007; Wandersman et al., 2008; Herzig et al., 2009; Duri et al., 2009a)....
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...(Trappe et al., 2007) has demonstrated that modern synchrotron sources and X-ray detectors are now sufficiently advanced to allow for measurements of dynamical heterogeneities....
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...The length scale dependence of dynamical heterogeneity in weak gels has been explored both numerically [176] and in XPCS experiments [110]....
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...The activity in this field is thus growing rapidly (Trappe et al., 2007; Wandersman et al., 2008; Herzig et al., 2009; Duri et al., 2009a; Wochner et al., 2009) and there is hope that eventually X-ray scattering experiments may probe dynamical heterogeneity in molecular glass formers and not only…...
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...The length scale dependence of dynamical heterogeneity in weak gels has been explored both numerically (Charbonneau and Reichman, 2007) and in XPCS experiments (Trappe et al., 2007)....
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Journal Article•DOI•

X-ray photon correlation spectroscopy.

[...]

Oleg Shpyrko¹•Institutions (1)

University of California, San Diego¹

01 Sep 2014-Journal of Synchrotron Radiation

TL;DR: The basic principles of X-ray photon correlation spectroscopy are reviewed, some novel approaches to XPCS analysis are discussed, and a discussion of the future impact of diffraction-limited storage rings on new types of X PCS experiments is discussed.

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Abstract: In recent years, X-ray photon correlation spectroscopy (XPCS) has emerged as one of the key probes of slow nanoscale fluctuations, applicable to a wide range of condensed matter and materials systems. This article briefly reviews the basic principles of XPCS as well as some of its recent applications, and discusses some novel approaches to XPCS analysis. It concludes with a discussion of the future impact of diffraction-limited storage rings on new types of XPCS experiments, pushing the temporal resolution to nanosecond and possibly even picosecond time scales.

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148 citations

Cites background from "Investigation of q-dependent dynami..."

...…issue of growing length scales accompanying the glass transition (Berthier et al., 2005; Keys et al., 2007) and growing dynamical heterogeneities (Trappe et al., 2007; Duri & Cipelletti, 2006; Kawasaki et al., 2007; Hartl, 2001), i.e. phenomena where the dynamics in nanoscale regions of…...
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...For example, intermittent dynamics (temporal heterogeneity) and spatial dynamical heterogeneity can be studied via the calculation of the dynamical susceptibility 4, or fourth-order correlation function (Trappe et al., 2007; Duri & Cipelletti, 2006; Duri et al., 2005a,b; Cipelletti et al., 2003b)....
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...…Mochrie et al., 1997; Gao & Kilfoil, 2007; Duri et al., 2009; Fluerasu et al., 2007; Lal et al., 2001; Robert et al., 2008; Spannuth et al., 2011; Trappe et al., 2007; Zhang et al., 2011; Guo et al., 2007; Chung et al., 2006; Bandyopadhyay et al., 2004), liquid crystals (Madsen et al., 2003;…...
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Journal Article•DOI•

Beyond simple exponential correlation functions and equilibrium dynamics in x-ray photon correlation spectroscopy

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Anders Madsen¹, Robert L. Leheny², Hongyu Guo², Michael Sprung, Orsolya Czakkel¹ - Show less +1 more•Institutions (2)

European Synchrotron Radiation Facility¹, Johns Hopkins University²

01 May 2010-New Journal of Physics

TL;DR: In this article, the complex dynamics in condensed matter studied with x-ray photon correlation spectroscopy (XPCS) in which non-exponential correlation functions and dispersion relations deviating from the simple diffusion law are observed.

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Abstract: We discuss the complex dynamics in condensed matter studied with x-ray photon correlation spectroscopy (XPCS) in which non-exponential correlation functions and dispersion relations deviating from the simple diffusion law are observed. Results are presented for two systems whose dynamics are characterized by compressed, faster-than-exponential correlation functions associated with hyper-diffusive motion. In the first case, the microscopic response of an aerogel following sectioning is investigated. In the second, the out-of-equilibrium dynamics in a dense colloidal gel recovering from shear is analyzed. In both cases, the dynamics, which can be associated with relaxation of internal stress, exhibits ageing. Included in the analyses are calculations of two-time correlation functions and the variance of the instantaneous degree of correlation, yielding the dynamical susceptibility.

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145 citations

Journal Article•DOI•

Heterogeneous yielding dynamics in a colloidal gel

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Thomas Gibaud¹, Thomas Gibaud², Damien Frelat², Sébastien Manneville²•Institutions (2)

Brandeis University¹, École normale supérieure de Lyon²

20 Jul 2010-Soft Matter

TL;DR: In this paper, the authors used high-frequency ultrasound during creep and oscillatory shear experiments to observe the local dynamics of opaque attractive colloidal gels and reveal the importance of activated processes for the gel dynamics and raise a number of open questions.

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Abstract: Attractive colloidal gels display a solid-to-fluid transition as shear stresses above the yield stress are applied. This shear-induced transition is involved in virtually any application of colloidal gels. It is also crucial for controlling material properties. Still, the yielding transition is far from understood, mainly because rheological measurements are spatially averaged over the whole sample. We use high-frequency ultrasound during creep and oscillatory shear experiments to observe the local dynamics of opaque attractive colloidal gels. The transition proceeds from the cell walls and heterogeneously fluidizes the whole sample with a characteristic time that exponentially decreases with the applied stress. The present results reveal the importance of activated processes for the gel dynamics and raise a number of open questions in the attempt to better understand the yielding transition.

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131 citations

Journal Article•DOI•

XPCS: Nanoscale motion and rheology

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Robert L. Leheny¹•Institutions (1)

Johns Hopkins University¹

01 Feb 2012-Current Opinion in Colloid and Interface Science

TL;DR: X-ray photon correlation spectroscopy (XPCS) has emerged as a powerful technique for investigating slow, nanometer-scale structural dynamics in materials and has been used extensively in complex fluids as mentioned in this paper, including block copolymer phases, colloidal glasses and gels, and polymer thin-film surfaces and interfaces.

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Abstract: X-ray photon correlation spectroscopy (XPCS) has emerged as a powerful technique for investigating slow, nanometer-scale structural dynamics in materials. This paper reviews major directions of recent XPCS research on complex fluids where significant information relevant to their rheological behavior has been obtained. The review focuses on three topics: block-copolymer phases, colloidal glasses and gels, and polymer thin-film surfaces and interfaces. The paper also discusses important anticipated developments for XPCS in the near future and describes some particularly promising directions for the technique in advancing understanding of complex-fluid rheology, including the application of XPCS to microrheology.

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109 citations