Investigation of Relaxation Processes in Nanocomposites by Transient Grating Experiments

Taschin, A.; Bartolini, Paolo; Sánchez‐Ferrer, Antoni; Mezzenga, Raffaele; Mrzel, Aleš; Torre, Renato

doi:10.4028/www.scientific.net/msf.714.79

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…At room temperature the ultrasonic velocity is of order 1500 m s À1 for both the reference sample and composite. The earlier transient grating experiments in similar poly(urea) composites also did not reveal velocity changes at room temperature [19].…”

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confidence: 83%

Ultrasonic properties of composites of polymers and inorganic nanoparticles

Samulionis

Svirskas

Banys

et al. 2013

Phys. Status Solidi A

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The temperature dependencies of ultrasonic velocity and attenuation were measured in composites of inorganic nanoparticles with two types of polymers, poly(urea) elastomer with inorganic Mo 6 S 4 I 6 nanowires and poly(e-caprolactone) (PCL) with Mo 6 S 3 I 6 nanowires. Below room temperature large ultrasonic relaxation attenuation maxima and velocity dispersion were observed. It was found that the attenuation peak in the elastomer shifted to higher temperature after doping with nanoparticles and this behavior was related to the shift of glass transition temperature. The ultrasonic attenuation data was fitted to a relaxation equation with a single temperature dependent relaxation time. The thermal activation energy of the relaxation process, which was calculated from ultrasonic data, was found to increase in the poly(urea) elastomer doped with MoSI nanowires. The low temperature ultrasonic velocity increased in the poly(urea) with nanowires added and is determined by the increase in elastic modulus. Similar ultrasonic behavior was obtained for PCL composites with inorganic MoSI nanowires. In this case, the increase in elastic modulus was smaller in comparison to the composites of poly (urea) and nanowires. Therefore, reinforcement of PCL was less pronounced.

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confidence: 83%

Ultrasonic properties of composites of polymers and inorganic nanoparticles

Samulionis

Svirskas

Banys

et al. 2013

Phys. Status Solidi A

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“…In this respect, we investigated the propagation of ultrasonic acoustic waves in the lysozyme solution and hydrogel, by heterodyne transient grating (HD-TG) spectroscopy [28]. This is a powerful tool that provides valuable information about the elastic properties and their relationship with the relaxation and structural phenomena, both in homogeneous matter [29][30][31][32][33] and in materials characterized by complex structures [34][35][36][37][38][39]. HD-TG experiments can be considered an important advance in the investigation of hydrogels, thanks to their ability to measure collective relaxation times in a wide time/frequency window, hardly accessible by other methods.…”

Section: Introductionmentioning

confidence: 99%

Probing Globular Protein Self-Assembling Dynamics by Heterodyne Transient Grating Experiments

et al. 2019

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In this work, we studied the propagation of ultrasonic waves of lysozyme solutions characterized by different degrees of aggregation and networking. The experimental investigation was performed by means of the transient grating (TG) spectroscopy as a function of temperature, which enabled measurement of the ultrasonic acoustic proprieties over a wide time window, ranging from nanoseconds to milliseconds. The fitting of the measured TG signal allowed the extraction of several dynamic properties, here we focused on the speed and the damping rate of sound. The temperature variation induced a series of processes in the lysozyme solutions: Protein folding-unfolding, aggregation and sol–gel transition. Our TG investigation showed how these self-assembling phenomena modulate the sound propagation, affecting both the velocity and the damping rate of the ultrasonic waves. In particular, the damping of ultrasonic acoustic waves proved to be a dynamic property very sensitive to the protein conformational rearrangements and aggregation processes.

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“…We investigate the propagation of ultrasonic acoustic wave in the lysozyme solution and hydrogel by Heterodyne Transient Grating (HD-TG) spectroscopy 19 . This is a powerful tool that provides valuable information about the elastic properties and their relationship with the relaxation and structural phenomena, both in homogeneous matter [20][21][22][23][24] and materials characterized by complex structures [25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Probing Globular Proteins Self-Assembling Dynamics by Heterodyne Transient Grating Experiments

Catalini¹,

Taschin²,

Bartolini³

et al. 2018

Preprint

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In this work, we have studied the propagation of ultrasonic waves of lysozyme solutions characterized by different degrees of aggregation and networking. The experimental investigation has been performed by means of the Transient Grating (TG) spectroscopy as a function of temperature; this technique enables to measure the ultrasonic acoustic proprieties over a wide time window, ranging from nanoseconds to milliseconds. The fitting of the measured TG signal allows the extraction of several dynamic properties, here we focused on the speed and the damping rate of sound. The temperature variation induces in the lysozyme solutions a series of processes: protein folding-unfolding, aggregation and sol-gel transition. Our TG investigation shows how these self-assembling phenomena modulate the sound propagation, affecting both the velocity and the damping rate of the ultrasonic waves. In particular, the damping of ultrasonic acoustic waves proves to be a dynamic property very sensitive to the protein conformational rearrangements and aggregation processes.

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Investigation of Relaxation Processes in Nanocomposites by Transient Grating Experiments

Cited by 5 publications

References 12 publications

Ultrasonic properties of composites of polymers and inorganic nanoparticles

Ultrasonic properties of composites of polymers and inorganic nanoparticles

Probing Globular Protein Self-Assembling Dynamics by Heterodyne Transient Grating Experiments

Probing Globular Proteins Self-Assembling Dynamics by Heterodyne Transient Grating Experiments

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