Brillouin light scattering study of polymeric glassy sulfur

Ruta, Beatrice; Monaco, G.; Scarponi, F.; Fioretto, D.; Andrikopoulos, Konstantinos S.

doi:10.1016/j.jnoncrysol.2010.07.028

Cited by 7 publications

(15 citation statements)

References 24 publications

(31 reference statements)

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“…[22] The thermal behavior of sulfur was recently investigated extensively. [22,23] One of the most widely used physical methods to prepare sulfur composites is the melt-diffusion process in which a mixture of solid sulfur and a host material is heated to about 150 to 155 8C to induce the diffusion of sulfur into the host matrix.…”

Section: The Melt-diffusion Methodsmentioning

confidence: 99%

Recent Approaches for the Direct Use of Elemental Sulfur in the Synthesis and Processing of Advanced Materials

2015

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Elemental sulfur is an abundant and inexpensive material obtained as a by-product of natural-gas and petroleum refining operations. Recently, the need for the development of new energy-storage systems brought into light the potential of sulfur as a high-capacity cathode material in secondary batteries. Sulfur-containing materials were also shown to have useful IR optical properties. These developments coupled with growing environmental concerns related to the global production of excess elemental sulfur have led to a keen interest in its utilization as a feedstock in materials applications. This Minireview focuses on the recent developments on physical and chemical methods for directly processing elemental sulfur to produce functional composites and polymers.

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Section: The Melt-diffusion Methodsmentioning

confidence: 99%

Recent Approaches for the Direct Use of Elemental Sulfur in the Synthesis and Processing of Advanced Materials

2015

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“…In the BLS experiments, we used the backscattering configuration shown in figure 2a. The incident (k i ) light from the laser passes through a lens, is refracted at the air -sample interface (k 0 i ¼ nk i with n the refractive index) and is focused at the interface between the sample and substrate; the scattered light (k 0 s ¼ nk s ) can originate both from bulk phonons with wavevector q b ¼ 2nk i and, after reflection, from bulk phonons with q s ¼ 2k 0 i sin(f 0 ) ¼ 2k i sin(f ), travelling parallel to the surface (PS modes) [31,32].…”

Section: Appendix Amentioning

confidence: 99%

“…In this work, we studied intact cartilage, which comprises ca 100-to 130-nmthick highly oriented type II collagen fibres embedded in a proteoglycan gel. We used experimental configurations in which the samples were placed on a reflective substrate to investigate both the effect of sample orientation relative to a fixed scattering geometry on the BLS spectrum, as required to fully characterize the elasticity tensor [31,32] and, with the use of a scanning BLS microscope (micro-BLS), to obtain spectra of the samples on a microscopic scale. This latter approach has proven invaluable to gain two-dimensional mechanical rsif.royalsocietypublishing.org J. R. Soc.…”

Section: Introductionmentioning

confidence: 99%

Biomechanics of fibrous proteins of the extracellular matrix studied by Brillouin scattering

Palombo

Winlove

Edginton

et al. 2014

J. R. Soc. Interface.

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Brillouin light scattering (BLS) spectroscopy is a technique that is able to detect thermally excited phonons within a material. The speed of propagation of these phonons can be determined from the magnitude of the Brillouin frequency shift between incident and scattered light, thereby providing a measure of the mechanical properties of the material in the gigahertz range. The mechanical properties of the extracellular matrices of biological tissues and their constituent biopolymers are important for normal tissue function and disturbances in these properties are widely implicated in disease. BLS offers the prospect of measuring mechanical properties on a microscopic scale in living tissues, thereby providing insights into structure-function relationships under normal and pathological conditions. In this study, we investigated BLS in collagen and elastin-the fibrous proteins of the extracellular matrix (ECM). Measurements were made on type I collagen in rat tail tendon, type II collagen in articular cartilage and nuchal ligament elastin. The dependence of the BLS spectrum on fibre orientation was investigated in a backscattering geometry using a reflective substrate. Two peaks, a bulk mode arising from phonon propagation along a quasi-radial direction to the fibre axis and a mode parallel to the surface, depending on sample orientation relative to the fibre axis, could be distinguished. The latter peak was fitted to a model of wave propagation through a hexagonally symmetric elastic solid, and the five components of the elasticity tensor were combined to give axial and transverse Young's, shear and bulk moduli of the fibres. These were 10.2, 8.3, 3.2 and 10.9 GPa, and 6.1, 5.3, 1.9 and 8 GPa for dehydrated type I collagen and elastin, respectively. The former values are close to those previously reported. A microfocused BLS approach was also applied providing selection of single fibres. The moduli of collagen and elastin are much higher than those measured at lower frequency using macroscopic strains, and the difference between them is much less. We therefore believe, like previous investigators, that molecular-scale viscoelastic effects are responsible for the frequency dependence of the fibre biomechanics. Combining BLS with larger-scale mechanical testing methods therefore should, in the future, provide a means of following the evolution of mechanical properties in the formation of the complex structures found in the ECM.

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“…The vibrational dynamics has been studied in the high frequency range by means of IXS and is here reported together with a detailed analysis of the corresponding macroscopic behavior previously probed with BLS. 28 The combined use of low and high frequency data has allowed us to carefully scrutinize the elastic properties of the system and to analyze their relation to the above-mentioned features in the liquid and the glassy state, i.e., the fragility and the boson peak, respectively. Moreover, we show that by combing the elastic properties on different length scales it is possible to have a clear view of the vibrational dynamics of the system.…”

Section: Introductionmentioning

confidence: 99%

Nonergodicity Factor, Fragility, and Elastic Properties of Polymeric Glassy Sulfur

et al. 2011

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We present a detailed investigation of the vibrational dynamics of glassy sulfur (g-S). The large frequency range spanned in this study has allowed us to carefully scrutinize the elastic properties of g-S and to analyze their relation to various features of both the glassy and the liquid state. In particular, the acoustic properties of g-S present a quasi-harmonic behavior in the THz frequency range, while at lower frequency, in the GHz range, they are affected by a strong anharmonic contribution. Moreover, the high frequency (THz) dynamics of g-S does not present signatures of the elastic anomalies recently observed in a number of glasses. Despite this apparent contradiction, we show that this finding is not in disagreement with the previous ones. Finally, by considering the correct long wavelength limit of the density fluctuations in the glassy state, we estimate the continuum limit of the nonergodicity factor and we investigate recently proposed relations between the fast dynamics of glasses and the slow dynamics of the corresponding viscous melts.

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Brillouin light scattering study of polymeric glassy sulfur

Cited by 7 publications

References 24 publications

Recent Approaches for the Direct Use of Elemental Sulfur in the Synthesis and Processing of Advanced Materials

Recent Approaches for the Direct Use of Elemental Sulfur in the Synthesis and Processing of Advanced Materials

Biomechanics of fibrous proteins of the extracellular matrix studied by Brillouin scattering

Nonergodicity Factor, Fragility, and Elastic Properties of Polymeric Glassy Sulfur

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