Photoacoustic studies on two new organic NLO materials: L‐threonine and L‐prolinium tartrate

Dhas, S. A. Martin Britto; Suresh, M.; Raji, P.; Ramachandran, K.; Natarajan, S.

doi:10.1002/crat.200610795

Cited by 20 publications

(4 citation statements)

References 13 publications

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“…Single crystal of L-proline shows no center of symmetry and its NLO coefficients have been examined by Boomadevi et al [10]. Martin Britto Dhas et al [11] have reported that the second harmonic generation (SHG) efficiency of L-prolinium tartrate is 90% of that of standard potassium dihydrogen orthophosphate (KDP) crystals.…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of l-prolinium picrate single crystal: A promising NLO crystal

Devi¹,

Lawrence²,

Babu³

et al. 2008

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

Growth and characterization of l-prolinium picrate single crystal: A promising NLO crystal

Devi¹,

Lawrence²,

Babu³

et al. 2008

Journal of Crystal Growth

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“…It is a non-invasive and non-destructive method; the analyzed samples do not require prior preparation to be characterized. By this technique it is possible to obtain optical and thermal properties as optical absorption coefficient, thermal diffusivity and thermal effusivity (Satour and Zegadi, 2020; Mandelis, 1983; Lamastra et al, 2018 ; Britto Dhas et al, 2007 ), including also complex materials that contain different structures and layers ( Hernandez-Aguilar et al, 2015 ).…”

Section: Resultsmentioning

confidence: 99%

Photoacoustic characterization of wheat bread mixed with Moringa oleifera.

Hernández-Aguilar

Domínguez-Pacheco

Valderrama-Bravo

et al. 2021

Current Research in Food Science

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Photoacoustic spectroscopy is applied to evaluate the impact of Moringa at different concentrations (0, 1.25, 2.5, 5 and 10%) on the elaboration, sanity, texture, and color of wheat bread. It was found that: i) Photoacoustic signal amplitude values of bread significantly increase from 37 to 90% when moringa powder concentration raises from 1.25% to 10%, at 300 nm wavelength. ii) Comparing the photoacoustic signal values at 300, 330, and 370 nm wavelengths, produced by the different bread types, there were statistically significant differences. iii) The sanitary quality of bread mixed with a 2.5% of moringa is relatively higher than the ones obtained for other concentrations, such that the number of fungal colonies were reduced by 99% in comparison with the control bread without moringa, after six days of storage. Moringa at 2.5% of concentration could thus improve the sanitary quality of wheat bread. iv) The addition of moringa for making bread slows down its textural changes (hardness, elasticity, cohesiveness, resilience, and chewiness) during storage. v) Finally, the highest correlation between the photoacoustic amplitude and the moringa concentration occurs at the wavelengths of 300 and 330 nm, which could be related to significant changes in the content of flavonoids and phenolic acids.

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“…Simulations work has been performed on copper and gold nanowires for which a crystal to amorphous phase transition has been observed . In the present context, we have opted for l -threonine crystal so as to understand the phase stability at dynamic shock wave loaded conditions, since it is one of the familiar hydrogen bonded amino acid crystals as well as technologically important materials for nonlinear optical applications. − Hence, it would be better to perform high-pressure and low-temperature experiments to realize the better suitability of the material for non-ambient condition applications. On the one hand, there are quite a few articles available on l -threonine crystal to understand the crystal growth and their characterizations at ambient conditions. − On the other hand, there are only a few research publications available in order to comprehend the phase stability of the title crystal at high-pressure and ion irradiation conditions.…”

Section: Introductionmentioning

confidence: 99%

Shock Wave Induced Crystallographic Structural Phase Transitions (Tri-states) of l-Threonine Crystal

Sivakumar

Sudalai

Dhas³

et al. 2021

J. Phys. Chem. C

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In the present framework, a series of shock-wave impact studies have been conducted and demonstrated showcasing the structural stability of an l-threonine crystal and subjecting it to different numbers of shock pulses, i.e., one to eight pulses. X-ray diffractometry and scanning electron microscopy have been employed for the crystal to monitor the structural and surface morphological properties at shocked conditions. Surprisingly, the test sample undergoes a few phase transitions with respect to the number of shock pulses such that the transition takes place from P212121 to P21 at the 3rd shock. Dramatically, P21 undergoes complete transition of amorphization at the 5th shock, and more interestingly, P21 reappears at the 6th shocked condition. The phase transition of P21 to P212121 is observed at the 8th shocked condition. In addition to that, the occurred surface morphological changes have been analyzed by the scanning electron microscopic technique, and we have found significant morphological changes with respect to the number of shock pulses. To the best of our knowledge, the above-mentioned phase transitions of three different types have never been observed and reported for l-threonine at shocked conditions. These findings indicate that even mild shock waves are sufficient to enforce amorphization and surface defects on the test crystal.

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Photoacoustic studies on two new organic NLO materials: L‐threonine and L‐prolinium tartrate

Cited by 20 publications

References 13 publications

Growth and characterization of l-prolinium picrate single crystal: A promising NLO crystal

Growth and characterization of l-prolinium picrate single crystal: A promising NLO crystal

Photoacoustic characterization of wheat bread mixed with Moringa oleifera.

Shock Wave Induced Crystallographic Structural Phase Transitions (Tri-states) of l-Threonine Crystal

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