Growth and characterization of KDP crystals doped with l-aspartic acid

Krishnamurthy, R.; Rajasekaran, R.; Samuel, B. S.

doi:10.1016/j.saa.2012.11.068

Cited by 18 publications

(2 citation statements)

References 8 publications

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“…Furthermore, the band observed at 1400 cm −1 could be associated with carbonates 34 . Phosphates exhibit absorption bands at 1103 cm −1 35 , 36 and silicates at approximately 1016 cm −1 37 . The bands at 2900 and 2990 a cm −1 are associated with C–C and C–H from lipids 8 .…”

Section: Resultsmentioning

confidence: 99%

Encapsulated salts in velvet worm slime drive its hardening

Corrales-Ureña

Schwab

Ochoa-Martínez

et al. 2022

Sci Rep

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Slime expelled by velvet worms entraps prey insects within seconds in a hardened biopolymer network that matches the mechanical strength of industrial polymers. While the mechanic stimuli-responsive nature and building blocks of the polymerization are known, it is still unclear how the velvet worms’ slime hardens so fast. Here, we investigated the slime for the first time, not only after, but also before expulsion. Further, we investigated the slime’s micro- and nanostructures in-depth. Besides the previously reported protein nanoglobules, carbohydrates, and lipids, we discovered abundant encapsulated phosphate and carbonate salts. We also detected CO2 bubbles during the hardening of the slime. These findings, along with further observations, suggest that the encapsulated salts in expelled slime rapidly dissolve and neutralize in a baking-powder-like reaction, which seems to accelerate the drying of the slime. The proteins’ conformation and aggregation are thus influenced by shear stress and the salts’ neutralization reaction, increasing the slime’s pH and ionic strength. These insights into the drying process of the velvet worm’s slime demonstrate how naturally evolved polymerizations can unwind in seconds, and could inspire new polymers that are stimuli-responsive or fast-drying under ambient conditions.

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Section: Resultsmentioning

confidence: 99%

Encapsulated salts in velvet worm slime drive its hardening

Corrales-Ureña

Schwab

Ochoa-Martínez

et al. 2022

Sci Rep

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“…In the past decade, KDP crystals doped with amino acids (in particular with l-arginine) have been studied in detail. The introduction of these organic molecules into the matrix of a KDP crystal improves the nonlinear optical parameters, increases the optical transparency and thermal stability, and decreases the electrical parameters (Krishnamurthy et al, 2013;Parikh et al, 2007;Muley et al, 2009;Meena & Mahadevan, 2008). It has been observed that the efficiency of second-harmonic generation (SHG) in l-arginine (l-Arg)-doped crystals rises by a factor of about 2 in comparison with pure KDP (Parikh et al, 2010;Kostenyukova et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Polarimetric studies of L-arginine-doped potassium dihydrogen phosphate single crystals

Shopa

Shribak

et al. 2020

J Appl Cryst

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Conoscopic interference patterns, channelled spectra and polarimetric techniques have been used for the characterization of pure and doped (with L-arginine amino acid) potassium dihydrogen phosphate (KDP) single crystals. Experimental polarimetric data have been obtained for the frequently used wavelength of 633 nm and for two close wavelengths of 532 and 543 nm in a high-accuracy dual-wavelength polarimeter. The measurement of eigenwave ellipticity in the [100] and [010] directions and between 295 and 340 K shows small differences in the absolute values of the specific optical rotations of KDP crystals doped with L-arginine in the range of 0.7–3.8 wt%. It is found that the gyration tensor component g 11, specific optical rotation and eigenwave ellipticity show different dispersion in the visible spectral region.

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