Synchrotron X-ray techniques for the investigation of structures and dynamics in interfacial systems

Cristofolini, Luigi

doi:10.1016/j.cocis.2014.03.006

Cited by 51 publications

(24 citation statements)

References 113 publications

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“…In previous work, we have been able to identify heterogeneities by grazing-incidence x-ray photon correlation spectroscopy (GI-XPCS) [16] in a Langmuir polymeric monolayer [17] and in the highly compressed phase of a 2D gel generated as a Langmuir monolayer of gold nanoparticles [18]. In the former case, heterogeneous dynamics could be observed clearly in the photoinduced fluid phase of the polymer, while in the latter case, heterogeneity was found to be growing with increasing surface compression, and the quality of the data was good enough to allow the experimental determinations of the fourthorder temporal correlation function in an arrested system by GI-XPCS.…”

Section: Introductionmentioning

confidence: 99%

Controlling the dynamics of a bidimensional gel above and below its percolation transition

et al. 2014

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The morphology and the microscopic internal dynamics of a bidimensional gel formed by spontaneous aggregation of gold nanoparticles confined at the water surface are investigated by a suite of techniques, including grazing-incidence x-ray photon correlation spectroscopy (GI-XPCS). The range of concentrations studied spans across the percolation transition for the formation of the gel. The dynamical features observed by GI-XPCS are interpreted in view of the results of microscopic imaging; an intrinsic link between the mechanical modulus and internal dynamics is demonstrated for all the concentrations. Our work presents an example of a transition from a stretched to a compressed correlation function actively controlled by quasistatically varying the relevant thermodynamic variable. Moreover, by applying a model proposed some time ago by Duri and Cipelletti [Europhys. Lett. 76, 972 (2006)] we are able to build a master curve for the shape parameter, whose scaling factor allows us to quantify a "long-time displacement length." This characteristic length is shown to converge, as the concentration is increased, to the "short-time localization length" determined by pseudo-Debye-Waller analysis of the initial contrast. Finally, the intrinsic dynamics of the system is then compared with that induced by means of a delicate mechanical perturbation applied to the interface.

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Section: Introductionmentioning

confidence: 99%

Controlling the dynamics of a bidimensional gel above and below its percolation transition

et al. 2014

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“…an exponent β < 1 is found, this behaviour is referred to as "stretched behaviour". On the contrary in the last decade an unusual behaviour characterized by a β exponent β > 1 has been observed and referred to as "compressed behaviour" [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]. These two peculiar trends correspond to different microscopic dynamics of the particles.…”

Section: Introductionmentioning

confidence: 91%

Non-diffusive dynamics in a colloidal glass: Aging versus rejuvenation

Angelini

Ruzicka

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Grazing-incidence small-angle X-ray scattering (GISAXS) is a powerful and broadly applicable method for quantifying structural order in interfaces, coatings, thin films and multilayered nanostructures (Smilgies et al, 2002;Mü ller-Buschbaum, 2003;Cristofolini, 2014). The scattering intensity in GISAXS is greatly enhanced because of beam projection along the sample surface (Smilgies, 2009), as well as waveguide effects that can increase the effective path-length through the sample and localize the photon field within the film (Jiang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%