Raman spectroscopy of laser shocked polystyrene

Rastogi, Vinay; Chaurasia, S.; Rao, U. R. K.; Sijoy, C. D.; Mishra, Vinayak; Kumar, Manmohan; Deo, M. N.; Chaturvedi, S.; Sharma, Surinder M.

doi:10.1002/jrs.5046

Cited by 12 publications

(18 citation statements)

References 46 publications

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“…The wavenumber shift data were analyzed to determine mode Grüneisen parameter and bond anharmonicities. The more detailed analysis can be found in reference …”

Section: Resultsmentioning

confidence: 94%

“…larger distance covered by the shock wave. The left Raman peaks centered at 1004 and 1606 cm −1 , respectively, represent the unshocked region, while the right peaks at 1009 and 1613 cm −1 show the shocked region . The simulated spatial profile of shock wave at different time delays is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…It shows that the 2D effect in our experiment is negligible. The details of the 1D simulation are discussed elsewhere and omitted here for the sake of brevity. By using time evolution of Raman peak intensity ratios, the shock wave velocity inside the polystyrene sample is estimated by the following equation: U s = r .…”

Section: Resultsmentioning

confidence: 99%

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Time‐resolved Raman spectroscopy of polystyrene under laser driven shock compression

Rastogi

Chaurasia

Rao

et al. 2017

J Raman Spectroscopy

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The microscopic and dynamic response of the atactic polystyrene molecules under shock compression at laser power density of 4.9 GW/cm2 was studied using time‐resolved Raman spectroscopy. The shock pressure estimated in the polystyrene sample was 2 GPa, and the temporal and wavenumber resolutions in these experiments were 3 ns and 3 cm−1, respectively. The shocked polystyrene showed a blue shift of 5 and 7 cm−1 for the 1004 cm−1 (C―C―C ring bending mode ν12) and 1606 cm−1 (C―C ring stretching mode νbold8bolda. , respectively. The changes in ν12 and νbold8bolda modes are observed with respect to shock wave propagation. It is observed that the intensities of the Raman peaks decrease and the FWHM of the modes increase due to formation of additional new peaks with delay. The reason behind this indicates the mechanical processes associated with the uniaxial nature of the shock compression. The shock velocity inside the polystyrene was calculated as 2.9±0.12 km/s using the evolution of intensity ratio of peaks with time. This is in good agreement with the shock velocity (3.0 km/s) deduced from the 2D simulations, performed using three temperature radiation hydrodynamic code, THRD. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The wavenumber shift data were analyzed to determine mode Grüneisen parameter and bond anharmonicities. The more detailed analysis can be found in reference …”

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Time‐resolved Raman spectroscopy of polystyrene under laser driven shock compression

Rastogi

Chaurasia

Rao

et al. 2017

J Raman Spectroscopy

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“…Each Raman spectrum was obtained by accumulating 300 laser shots. The more detail description of the experiment can be found elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…In the present study, we examined the effect of the shock compression on the molecular structure and conformation of PVT, and its stability under extreme conditions. We have recently reported results of the Raman spectroscopy of shocked polystyrene . In this connection, it will be interesting to compare the results of PVT with that of the polystyrene.…”

Section: Introductionmentioning

confidence: 99%

In situ Raman spectroscopic studies of polyvinyl toluene under laser‐driven shock compression and comparison with hydrostatic experiments

Rastogi

Chaurasia

Rao

et al. 2017

J Raman Spectroscopy

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Shock wave‐induced changes in intra‐molecular vibrations of polyvinyl toluene (PVT) in a confined geometry target assembly are studied over the pressure range of 0–2.25 GPa. A comparative study of the behavior of PVT in the dynamic and quasi‐hydrostatic compression is performed. A 1D radiation hydrodynamic simulation has been performed to calculate the equation of state of the PVT. In present study, the fundamental modes, ν12 mode at 1001 cm−1, ν18a mode at 1031 cm−1 and ν8a mode at 1602 cm−1, of PVT are extensively analyzed. At a pressure of 1.58 GPa, peak shift of 4.24, 5.16 and 6.41 cm−1 for the modes 1001, 1031 and 1602 cm−1, respectively, are observed and are in good agreement with the hydrostatic measurement. Grüneisen parameters are calculated for each modes, which indicates that the primarily volume changes (below 1 GPa) are due to free volume and compression of the inter‐chain bonds, and not because of changes in intermolecular bond lengths. The shock velocity in the sample at pressure 2.25 GPa is calculated as 3.6 ±0.46 km/s by measuring the ratios of the experimental shocked volume to total volume of the sample measured in the time‐resolved measurement and is in good agreement with the simulation result. A comparative study of shock pressure on PVT and polystyrene molecules is also done. These materials are of great interest as they are widely being used as a host material in scintillator detectors, which are used for the measurement of high‐frequency electromagnetic radiation. Copyright © 2017 John Wiley & Sons, Ltd.

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Magnetic polystyrene–palygorskite nanocomposite obtained by heterogeneous phase polymerization to apply in the treatment of oily waters

Middea

Spinelli

Souza

et al. 2017

J of Applied Polymer Sci

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Water contaminated by oil poses challenges to the management of water resources. Magnetic nanoparticles has been issue of different potential applications including remotion oil from water. Magnetic polystyrene-palygorskite nanocomposites were prepared by a heterogeneous phase polymerization for the removal of organic contaminants from water. The organo-Fe 3 O 4 -palygorskite nanoparticles were coated with polystyrene, forming water repellent and oil absorbing surfaces to promote the removal of oil from the surfaces of nanocomposites by applying an external magnetic field. X-ray fluorescence, X-ray diffraction, scanning electron microscopy, zeta potential and size distribution measurement, surface area determination by BET, density measurement by He pycnometry, carbon grade determination, thermogravimetric analysis, Fourier-transform infrared spectroscopy, Raman spectroscopy, and evaluation of hydrophobicity by contact angle were used to characterize the nanoparticles. The magnetic nanocomposite obtained showed excellent hydrophobicity, around 788 contact angle. In addition, oil removal capability tests were also performed, according to which the preliminary results indicated removal of approximately 98% of oil in synthetic oily water samples. The oil-water separation using this magnetic nanocomposite provides a promising alternative strategy for water treatment.

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Raman spectroscopy of laser shocked polystyrene

Cited by 12 publications

References 46 publications

Time‐resolved Raman spectroscopy of polystyrene under laser driven shock compression

Time‐resolved Raman spectroscopy of polystyrene under laser driven shock compression

In situ Raman spectroscopic studies of polyvinyl toluene under laser‐driven shock compression and comparison with hydrostatic experiments

Magnetic polystyrene–palygorskite nanocomposite obtained by heterogeneous phase polymerization to apply in the treatment of oily waters

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